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Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei
Open accessPublished version of a preprint
Abstract
Serotonin neurons of the dorsal and median raphe nuclei (DR, MR) collectively innervate the entire forebrain and midbrain, modulating diverse physiology and behavior. To gain a fundamental understanding of their molecular heterogeneity, we used plate-based single-cell RNA-sequencing to generate a comprehensive dataset comprising eleven transcriptomically distinct serotonin neuron clusters. Systematic in situ hybridization mapped specific clusters to the principal DR, caudal DR, or MR. These transcriptomic clusters differentially express a rich repertoire of neuropeptides, receptors, ion channels, and transcription factors. We generated novel intersectional viral-genetic tools to access specific subpopulations. Whole-brain axonal projection mapping revealed that DR serotonin neurons co-expressing vesicular glutamate transporter-3 preferentially innervate the cortex, whereas those co-expressing thyrotropin-releasing hormone innervate subcortical regions in particular the hypothalamus. Reconstruction of 50 individual DR serotonin neurons revealed diverse and segregated axonal projection patterns at the single-cell level. Together, these results provide a molecular foundation of the heterogenous serotonin neuronal phenotypes.
Overview
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TL;DR
Plate-based single-cell RNA-sequencing of 999 mouse dorsal and median raphe serotonin neurons identified 11 transcriptomic clusters with distinct spatial, molecular, and projection features. Intersectional viral tracing and single-neuron reconstruction showed that Vglut3+ and Trh+ DR serotonin neurons preferentially innervate cortical versus subcortical targets, while individual DR serotonin neurons have highly diverse whole-brain arborization patterns.
Key findings
- scRNA-seq of 999 Tph2+ serotonin neurons from 14 adult mouse brains resolved 11 transcriptomic clusters: six principal DR clusters (DR-1–6), one caudal DR cluster (cDR), and four median raphe clusters (MR-1–4); HCR-smFISH with 16 markers mapped these clusters to pDR, cDR, or MR locations.
- Co-transmitter and neuropeptide expression was heterogeneous: 65% of serotonin neurons expressed Vglut3, 35% expressed Gad1, Gad2, or both, 13% expressed Vglut3 plus Gad1/Gad2, and 14% expressed none of these glutamate/GABA markers; Trh was expressed in 14% and Crh in 7% of serotonin neurons.
- Intersectional Sert-Flp with Vglut3-Cre or Trh-Cre showed that Vglut3+ pDR serotonin neurons preferentially innervate cortical regions, whereas Trh+ pDR serotonin neurons innervate subcortical regions including anterior/medial hypothalamus and thalamic nuclei; whole-brain mapping used n = 3 mice per genotype.
- Reconstruction of 50 individual DR serotonin neurons revealed total axon lengths from 1.9 cm to 26.3 cm, with cortex-projecting neurons having the longest axons; 37/50 projections were unilateral, and 34/46 forebrain-projecting neurons had >80% of forebrain axon length in either cortical or subcortical regions.
Methods
- Serotonin neurons were labeled using Sert-Cre;Ai14 mice, acutely dissociated from brain slices of postnatal day 40–45 mice (six females, eight males), FACS-sorted, and processed with Smart-seq2; 709 cells came from eight MR/pDR/cDR samples and 290 cells from six pDR-only samples, yielding 999 cells after QC.
- Clustering used Seurat v3.0 with PCA and Louvain clustering; HCR-based smFISH against 16 cluster markers plus Tph2 was used to map transcriptomic clusters anatomically.
- For projection mapping, Sert-Flp mice were crossed with Vglut3-Cre or Trh-Cre and injected with AAV-CreON/FlpON-mGFP; brains were cleared with AdipoClear, imaged by light-sheet microscopy, segmented with a 3D U-Net, and aligned to the Allen Common Coordinate Framework. Single-neuron reconstructions used dual-AAV sparse labeling and fMOST in 14 Sert-Cre mice.
Limitations
- Stated: single-neuron reconstruction was limited in scope to 50 reconstructed cells out of approximately 9000 DR serotonin neurons, and larger-scale reconstruction integrated with molecular identity and function is needed.
- Stated: whole-brain tracing showed inter-individual variability in total labeled axons and detailed projection patterns, and heterogeneity within Vglut3+ or Trh+ populations may contribute; larger experiments or single-cluster Cre lines are required.
- Stated/evident: the Sert-Flp line can drive reporter expression outside raphe serotonin neurons due to transient developmental Sert expression; the paper also notes that whether Gad1/Gad2+ serotonin neurons actually release GABA remains to be determined, and MR cluster anatomical organization was less obvious with clusters more intermingled.
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Figures
![Figure 3—figure supplement 1. Expression of marker genes across 11 clusters (Part I). Expression levels denote for log-transformed expression [ln(counts per million+1)] of each transcript.](/paper-figures/689fbbda9c0e4a05bee9e82e141798b9/single-cell-transcriptomes-and-whole-brain-projections-of-serotonin-neurons-in-figure-12.jpg)
![Figure 4—figure supplement 2. Sexually dimorphic genes consistently detected across the majority of serotonin cell subtypes. Expression levels denote for log-transformed expression [ln(CPM+1)] of each transcript.](/paper-figures/1c40e21a79d14633a7ae0abb3c75932f/single-cell-transcriptomes-and-whole-brain-projections-of-serotonin-neurons-in-figure-18.jpg)
Verification
Claims the paper makes
110 Own result · 55 Not checked yet · 27 Own interpretation · 9 Own method · 3 No basis given
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In the paper
“Specifically, we found that the distribution of markers for Clusters 1–6, Ret, Trh, Gad1, Npas1, Syt2, and C1ql2 (Figure 1D), were mostly restricted to the pDR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
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In the paper
“These 999 MR and DR serotonin neurons comprised 11 clusters (Figure 1B; Figure 1—figure supplement 2).”
- Also stated in: § Abstract · plain
“we used plate-based single-cell RNA-sequencing to generate a comprehensive dataset comprising eleven transcriptomically distinct serotonin neuron clusters.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Single-cell RNA-sequencing defines 11 transcriptomic clusters of serotonin neurons in the dorsal and median raphe
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- Also stated in: § Abstract · plain
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In the paper
“Each cluster contained cells from both sexes after removing genes located on the Y chromosome, indicating that there were few sex-specific differences at the level of transcriptomic clusters (Figure 1—figure supplement 1D).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Single-cell RNA-sequencing defines 11 transcriptomic clusters of serotonin neurons in the dorsal and median raphe
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In the paper
“Of the 11 transcriptomic clusters, six (Cluster 1–6) consisted of only serotonin neurons dissected from the pDR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
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In the paper
“Each of the 11 clusters expressed a set of cluster-discriminatory genes, including markers for specific neurotransmitter systems, such as Vglut3, Gad1, and Gad2 (Figure 1C,D; Figure 1—figure supplement 1–6).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Single-cell RNA-sequencing defines 11 transcriptomic clusters of serotonin neurons in the dorsal and median raphe
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“After quality control (Materials and methods), we determined the transcriptomes of 709 cells from eight samples that include MR, pDR, and cDR, and 290 cells from six pDR-only samples (999 cells in total, comprising 581 cells from female and 418 cells from male mice).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Single-cell RNA-sequencing defines 11 transcriptomic clusters of serotonin neurons in the dorsal and median raphe
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In the paper
“Dopamine receptor D2 (Drd2) is highly expressed in DR-3 (Niederkofler et al., 2016).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Within our data, we observed robust cluster-specific expression of multiple TF genes (Figure 4B; Figure 4—figure supplement 1; Figure 3—figure supplement 1–3).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Clusters MR-4 and cDR have the highest expression level of expression for Chrm1 and Chrm2, encoding muscarinic acetylcholine receptors.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“The two common Cluster 7 markers Tacr3 and Met were both highly concentrated in serotonin neurons under the aqueduct in the cDR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
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In the paper
“It has been reported that vesicular monoamine transporters (Slc8a1 for Vmat1; Slc8a2 for Vmat2) can transport GABA into synaptic vesicles (Stensrud et al., 2014), and virtually all serotonin neurons expressed Vmat2 (Figure 1—figure supplement 1D; Figure 4A left).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Irx2 (Wylie et al., 2010) is specific to MR-2 and MR-3.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“For example, thyrotropin-releasing hormone (Trh) is highly expressed in DR-1–3 (14% serotonin neurons, Figure 1C).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Interestingly, few of the Gad1+ or Gad2+ neurons express vesicular GABA transporter (Vgat, Figure 4A left), which is responsible for transporting GABA into synaptic vesicles for synaptic transmission.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Among dorsal pDR markers we identified Pax5 and Sox14 to strongly correlate (rp >0.5) with Gad1, Gad2, and Trh, among other genes.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“By contrast, Grik1, encoding subunit 1 of the kainate glutamate receptor, is more highly expressed in MR clusters.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Finally, even though there were no apparent sex-specific difference at the cluster level Figure 1—figure supplement 1D), we did detect several genes, such as Sod1, Snx10, Inpp4a, Zscan26, Ncam1, that showed sexual dimorphism across the majority of cell subtypes (Figure 4—figure supplement 2).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“For example, Grin3a, encoding subunit 3A of ionotropic NMDA glutamate receptor, is mainly expressed in pDR but not MR or cDR clusters.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Interestingly, two of these hubs were centered around pDR-specific TFs, and, independently, comprised of dorsal (DR-1, DR-2, DR-3) and ventral (DR-4, DR-5, DR-6) pDR markers (Figure 4C).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Notably, cDR preferentially expresses at least five neuropeptide receptors: gastric inhibitory polypeptide receptor (Gipr), tachykinin receptor 3 (Tacr3), relaxin family peptide receptor 1 (Rxfp1), calcitonin receptor (Calcr), and opioid receptor mu-1 (Oprm1).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“In addition to small-molecule transmitters, the majority of serotonin neurons also co-express neuropeptides (Figure 4A right).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“65% of serotonin neurons express Vglut3, 35% express either Gad1, Gad2, or both, and 13% express markers for Vglut3 and Gad1 or Gad2 (Figure 4A left).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plain- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“65% of serotonin neurons express Vglut3, 35% express either Gad1, Gad2, or both, and 13% express markers for Vglut3 and Gad1 or Gad2 (Figure 4A left).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Chrna3 and Chrna4, encoding subunit α3 and α4 of the nicotinic acetylcholine receptor, are also more enriched in MR clusters.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Clusters 9–11 markers Irx2 and Piezo2 were mostly found in the MR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
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In the paper
“Each cluster has a distinct expression pattern of neurotransmitter (including neuropeptide) receptors (Figure 4B, Figure 4—figure supplement 1).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“We found multiple genes to co-expressed (defined as rp >0.5) in serotonin neurons, forming co-expression modules among each other as well as around various TFs (Supplementary file 4).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Notably, genes encoding a voltage-gated K+ channel (Kchn8) and mechanosensitive channel (Piezo2) are highly expressed in the MR-4 cluster but exhibit little expression in all other clusters.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“At the single cell level, 14% of serotonin neurons do not express any of the gene markers for glutamate or GABA transmission.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Among ventral pDR markers, we found Crhr2 to be highly correlated with several TFs, receptors, and neurotransmitter-related genes, most notably Vglut3 (Slc17a8) and Hcrtr2.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“65% of serotonin neurons express Vglut3, 35% express either Gad1, Gad2, or both, and 13% express markers for Vglut3 and Gad1 or Gad2 (Figure 4A left).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Galanin (Gal) is highly expressed in pDR and MR-1 (Fernandez et al., 2016).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Sox13 is highly enriched in cDR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“Interestingly, Sox14, previously reported to be associated with GABAergic neurons in developing brain (Lahti et al., 2016), is expressed in Clusters 1 and 2 in adult serotonin neurons that co-express Gad1 and Gad2.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“Similarly, we found several MR- and cDR-specific TFs to be the hubs of co-expression modules.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“Neuropeptide B (Npb) is highly expressed in cDR and MR-4 but much less in pDR serotonin neurons.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The DR and MR serotonin clusters are also distinguished by differential expression of ion channels as well as axon guidance and cell adhesion molecules (Figure 4—figure supplement 1), which can contribute to their differences in physiological properties and wiring specificity.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Dlk1 should be expressed in the DR clusters as well as Cluster 8 (Figure 1D), and its expression was found in both the DR and MR, suggesting that Cluster 8 serotonin neurons are located in the MR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
plain- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Three DR clusters express Gad1 and Gad2, which encode biosynthetic enzymes for the neurotransmitter GABA.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plain- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Particularly, the expression of a large number of cell adhesion molecules, receptors, ion channel proteins and neuropeptides strongly correlate with the expression of TFs Zeb2, Pou3f1, Irx2, and Zfp536.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
boostedcorrelational- Asserted: passes — The authors put it forward as true.
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None of the sources cited for this claim have been checked yet.
In the paper
“Zeb2 (Okaty et al., 2015) is uniquely expressed in cDR and MR-4.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Meanwhile, opioid receptor kappa 1 (Oprk1) is expressed specifically in MR-2.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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None of the sources cited for this claim have been checked yet.
In the paper
“Nfix and Nfib (Bedford et al., 1998) are preferentially expressed in DR-3.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Many serotonin neurons express multiple neuropeptides (Figure 4A,B).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Of all the genes encoding serotonin receptors, Htr5b has the strongest cluster specificity (Figure 4B).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Three cells had collateralized axonal terminals in the striatum, pallidum, and lateral septal nucleus.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plain- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“These transcriptomic clusters differentially express a rich repertoire of neuropeptides, receptors, ion channels, and transcription factors.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Abstract
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In the paper
“We fully reconstructed whole-brain arborization patterns of 50 DR serotonin neurons from 14 Sert-Cre mice.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 14- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Whole-brain quantitative and statistical analyses showed Vglut3+ axons preferentially in anterolateral cortical regions and adjacent structures such as olfactory bulb, agranular insular cortex, endopiriform, piriform, and claustrum as well as other cortical regions such as entorhinal, primary motor, and barrel cortices.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal projections of selected serotonin neuron subpopulations
plaincorrelational- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Axons of the three dorsal cortex-projecting neurons traveled the largest distance, entering the cortex anteriorly and extending to the posterior end.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 3- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This group could be further divided into four subgroups based on the dominant targets (containing >40% total axon length in cortical regions): olfactory area-projecting (including olfactory bulb, piriform cortex, and cortical amygdala; n = 9), prefrontal cortex-projecting (n = 2), dorsal cortex-projecting (including motor, somatosensory, retrosplenial, auditory, and visual cortex; n = 4), and vent”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
hedgedn = 17- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Each cell of this group (n = 5) dedicated more axon terminals to the striatum, pallidum, and lateral septal nucleus (>20% of the axon length) than other brain regions except midbrain regions”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 5- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, as was seen in tissue sections, there were extensive differences in innervation patterns of terminal axon fields between the Vglut3+ and Trh+ populations.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal projections of selected serotonin neuron subpopulations
plaincorrelational- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“By contrast, no GFP-labeled axons were observed in the cortical regions from Trh-Cre;Sert-Flp mice.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
plain- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In the olfactory area-projecting subgroup, three brains had branches in the olfactory bulb (OB).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 3- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Each cell of this group (n = 6) dedicated more than 20% axon length to innervate the hypothalamus”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 6- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The cell bodies of these 50 serotonin neurons covered large regions of the DR”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plain- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Initial assessment of selected target regions suggested a strong segregation of axonal projection patterns between these two populations (Figure 7B,C), consistent with data from tissue sections (Figure 6D).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal projections of selected serotonin neuron subpopulations
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“One cell had extensive collateralization in the central amygdala (CeA) (>10% axon length)”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainSingle case- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“For two DR serotonin neurons that innervated ventral striatum (also called nucleus accumbens, or NAc), arborization appeared to be restricted to either the core or the shell”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Cortical regions contain the highest proportion of the terminals of this group of DR serotonin neurons (n = 17), which is more than 40% of their total axonal length.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 17- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“None of them had collateralization in the cortical regions.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 6- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This group of DR serotonin neurons (n = 4) all dedicated more than 40% their total axonal length to innervate the amygdala”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 4- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“their projections collectively innervated the majority of the brain regions”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 14- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
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In the paper
“We found that serotonin axons from Vglut3+ population preferentially targeted cortical regions (Figure 6D), consistent with our previous results (Ren et al., 2018).”
- Also stated in: § Abstract · plain
“Whole-brain axonal projection mapping revealed that DR serotonin neurons co-expressing vesicular glutamate transporter-3 preferentially innervate the cortex, whereas those co-expressing thyrotropin-releasing hormone innervate subcortical regions in particular the hypothalamus.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
What the sources say
- Not checked yetcites Ren et al., 2018 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
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- Also stated in: § Abstract · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Reconstruction of 50 individual DR serotonin neurons revealed diverse and segregated axonal projection patterns at the single-cell level.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Abstract
plaincorrelationaln = 50- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“While most projections of the DR serotonin neurons were unilateral (37/50)”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plain- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The subcortical-projecting serotonin neurons appear to have more specificity, with most neurons exhibiting dense arborization in one or two nuclei.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“When examined across the six groups, cortex-projecting serotonin neurons indeed had the longest axons (Figure 8H).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
boostedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Second, most of the serotonin neurons tend to focus a majority of their arborization within one brain region”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
plain- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The longest axon from a single serotonin neuron (26.3 cm) is >10 times the length of a mouse brain in the longest dimension from rostral olfactory bulb to caudal brainstem.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainSingle case- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Brain regions that are innervated by Vglut3+ but not by OFC-projecting serotonin neurons include the somatosensory barrel cortex, ventral striatum, and a specific sub-region of CeA.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and projection-defined serotonin sub-systems
plain- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Of the 46 forebrain-projecting DR serotonin neurons, 34 have a strong preference (>80% forebrain-projecting axon length) for innervating either cortical or subcortical regions.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
plain- Asserted: passes — The authors put it forward as true.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We found that the total axon length of these DR serotonin neurons exhibited considerable heterogeneity, from 1.9 cm to 26.3 cm.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plain- Asserted: passes — The authors put it forward as true.
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- Load-bearing: passes — The paper’s conclusions depend on it.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“one of the thalamus-projecting neurons had symmetrical bilateral projections in the thalamic target”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainSingle case- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“cortex-projecting serotonin neurons were biased towards ventral pDR (14 out of 17 cells)”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The six types of serotonin neurons within the pDR exhibit further specificity in spatial distributions.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Our single-cell transcriptome analysis identified 11 molecularly distinct types of serotonin neurons in the DR and MR (Figure 1).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“amygdala-projecting ones were preferentially distributed in the dorsal pDR (3 out of 4 cells).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Nevertheless, we confirmed the in situ hybridization data of Okaty et al. that Met is expressed in the cDR and MR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Okaty et al., 2015 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Meanwhile, most Trh+ serotonin neurons co-express Gad1, Kcns1, and α1A adrenergic receptors (Adra1a) specifically.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Integrating multiple features within individual serotonin sub-systems
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In the paper
“Here we found that each of the transcriptomic clusters of serotonin neurons have distinct combination of axon guidance and cell adhesion molecules (Figure 4—figure supplement 1A).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Integrating multiple features within individual serotonin sub-systems
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In the paper
“In addition to neurochemical properties, each serotonin neuron population expresses a specific combination of distinct genes responsible for electrophysiological (ion channels), connectivity (wiring molecules), and functional (neurotransmitter/peptide receptors) properties (Figure 4; Figure 4—figure supplement 1A).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Integrating multiple features within individual serotonin sub-systems
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In the paper
“For example, most Crhr2+ neurons co-express Vglut3 and Npy2r”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Integrating multiple features within individual serotonin sub-systems
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In the paper
“No substantial batch effect was observed (Figure 1—figure supplement 1E).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Single-cell RNA-sequencing defines 11 transcriptomic clusters of serotonin neurons in the dorsal and median raphe
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In the paper
“These observations suggest that glutamate is the most prevalent co-transmitter for serotonin neurons.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Anti-Tph2 staining showed that all GFP-labeled neurons are Tph2+ (Figure 5C,D).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
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In the paper
“Focusing further on cluster markers, we identified three transcriptional ‘hubs’ that putatively govern molecular programs within respective neurons.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Thus, Cluster 6 likely corresponds to serotonin neurons located preferentially in the lateral wings.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
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In the paper
“Npas3 is specifically expressed in the DR-6 cluster and is highly correlated with Htr1d, suggesting a critical role of maintaining the characteristics of DR-6 serotonin neurons.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Dlk1 should be expressed in the DR clusters as well as Cluster 8 (Figure 1D), and its expression was found in both the DR and MR, suggesting that Cluster 8 serotonin neurons are located in the MR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
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In the paper
“Glutamate co-release from Vglut3+ serotonin terminals has indeed been reported at the hippocampus (Varga et al., 2009), orbital prefrontal cortex (Ren et al., 2018), nucleus accumbens (Liu et al., 2014), ventral tegmental area (Wang et al., 2019), and basolateral amygdala (Sengupta et al., 2017).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
What the sources say
boostedcorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“To precisely investigate the function of transcriptome-based serotonin neuronal types, we need to use an intersectional strategy to target serotonin neurons that express specific additional markers (Jensen et al., 2008).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
What the sources say
- Not checked yetcites Jensen et al., 2008 source
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“suggesting their broad coverage of DR serotonin neuron types”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
hedgedcorrelationaln = 14- Asserted: passes — The authors put it forward as true.
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In the paper
“Our whole-brain projection analyses indicate that axonal arborization patterns of molecularly defined serotonin neuron subpopulations are still very complex (Figure 7).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
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In the paper
“The electrophysiological properties of DR serotonin neurons vary according to the projection patterns (Fernandez et al., 2016).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
What the sources say
- Not checked yetcites Fernandez et al., 2016 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“Pioneering work has introduced the molecular diversity of serotonin neurons across the midbrain and hindbrain (Okaty et al., 2015; Spaethling et al., 2014; Wylie et al., 2010), yet systematic analysis and integration of multiple cellular characteristics at single-cell resolution within each raphe nucleus is still lacking.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
What the sources say
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“Slice physiology recording showed that the serotonin neurons in the MR and DR have different electrophysiological characteristics, such as resting potential, membrane resistance, and reaction to serotonin receptor-1A agonist (Calizo et al., 2011; Fernandez et al., 2016).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
What the sources say
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“Together, these results provide a molecular foundation of the heterogenous serotonin neuronal phenotypes.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Abstract
plaincorrelationaln = 50- Asserted: passes — The authors put it forward as true.
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In the paper
“[Note that axons seen in hippocampus likely originated from Vglut3+ cells in MR (Muzerelle et al., 2016), though the majority of labeled somata were located in the ventral portion of pDR; see Figure 7—figure supplement 3C].”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal projections of selected serotonin neuron subpopulations
What the sources say
- Not checked yetcites Muzerelle et al., 2016 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
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In the paper
“Even within the MR or DR, there is considerable heterogeneity of serotonin neurons in multiple aspects.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
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In the paper
“Anti-Tph2 staining showed that 98.2% GFP+ neurons were Tph2+.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
plaincorrelationaln = 3- Asserted: passes — The authors put it forward as true.
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In the paper
“Accumulating evidence indicates that there are subgroup-specific projection patterns within the DR serotonin system (Niederkofler et al., 2016; Ren et al., 2018).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
What the sources say
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“As negative controls, we injected the same virus into mice carrying only the Sert-Flp transgene or only the Vglut3-Cre transgene and did not find any mGFP+ cell bodies or fibers (n = 3 for each; data not shown).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
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In the paper
“the cell body locations of these traced neurons (Figure 8—figure supplement 1B) were consistent with our previous results (Ren et al., 2018) as well as single-cell transcriptome, HCR-smFISH, and whole-brain bulk tracing data.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
What the sources say
- Not checked yetcites Ren et al., 2018 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“They nevertheless followed certain patterns.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“The fact that we can assign specific transcriptomic clusters to specific groups of raphe nuclei indicate that molecularly defined serotonin populations are spatially segregated at least at this coarse level.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“These comparisons support a broad correspondence between molecular identity and axonal projection patterns at the level of DR serotonin neuronal populations that include multiple transcriptomic clusters.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and projection-defined serotonin sub-systems
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“Together, these findings revealed the molecular basis for the differentiation of dorsal/ventral DR sub-systems (Figures 2 and 3).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
plaindirect- Asserted: passes — The authors put it forward as true.
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In the paper
“The last finding is consistent with our previous study indicating that ~23% of CeA-projecting DR serotonin neurons are Vglut3+ (Ren et al., 2018).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and projection-defined serotonin sub-systems
What the sources say
- Not checked yetcites Ren et al., 2018 source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
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A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This is likely an underestimate of the preference, especially for cortical-projecting ones, as their axons necessarily need to travel through the subcortical regions to reach the cortex.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
hedgeddirect- Asserted: passes — The authors put it forward as true.
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A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In summary, these results revealed remarkable complexity and heterogeneity of serotonin neuron projections at the single-cell level.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“Okaty et al. used intersectional genetic fate mapping to produce population RNA-seq data (and single-cell RNA-seq data from a small number of cells) from DR, MR, and caudal raphe nuclei derived from different rhombomeres during development.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Okaty et al., 2015 source
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“While our manuscript in review, a related study was published (Huang et al., 2019), identifying fewer transcriptomic clusters of DR serotonin neurons than we did.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Huang et al., 2019 source
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“Comparisons of the projection patterns of Vglut3+ (this study) with OFC-projecting DR serotonin neurons (Ren et al., 2018) suggest that the latter is a large subset of the former.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and projection-defined serotonin sub-systems
What the sources say
- Not checked yetcites Ren et al., 2018 source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“We note that in a recent comprehensive whole-brain scRNA-seq study, Zeisel et al. (2018) grouped 437 brainstem serotonin neurons in the dataset (presumably containing the entire B1–B9 groups) into just five clusters.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Zeisel et al., 2018 source
hedged- Asserted: passes — The authors put it forward as true.
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A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Whole-brain collateralization patterns of these two sub-systems indicate that there must be additional sub-systems projecting to regions not visited by either of these two sub-systems projects to, including much of the thalamus and hypothalamus.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and projection-defined serotonin sub-systems
hedgeddirect- Asserted: passes — The authors put it forward as true.
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In the paper
“Our results are broadly consistent with previous findings that utilized developmental origin to differentiate raphe serotonin neurons (Okaty et al., 2015).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Okaty et al., 2015 source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“First, there is a general segregation of cortical- and subcortical-projecting serotonin neurons.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“We note that a previous study has reconstructed axonal projections of sparsely-labeled DR neurons in the rat using microiontophetic injection of biotin dextran amine, followed by serial histological section and reconstruction (Gagnon and Parent, 2014).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
What the sources say
- Not checked yetcites Gagnon and Parent, 2014
plain- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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In the paper
“Together with our study on the projection-defined serotonin sub-systems (Ren et al., 2018), we believe it is unlikely that the major function of the forebrain-projecting serotonin system is to broadcast information non-discriminately.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
What the sources say
- Not checked yetcites Ren et al., 2018 source
hedged- Asserted: passes — The authors put it forward as true.
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- Load-bearing: passes — The paper’s conclusions depend on it.
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What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“We have totally reconstructed 50 high quality neurons with complete and clear axon terminals.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Materials and methods > Single Cell Reconstruction
plain- Asserted: passes — The authors put it forward as true.
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What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“But our study is still limited by the scope (50 reconstructed cells out of 9000 DR serotonin neurons).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
plain- Asserted: passes — The authors put it forward as true.
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- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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- Rests on an assumption: The DR contains approximately 9000 serotonin neurons.
In the paper
“As previously described for the Sert-Cre line, the Sert-Flp line appears to drive transgenic reporter expression outside the raphe serotonin neurons (including neurons in the retina, cortex, and thalamus) because of the transient expression of Sert during development (Lebrand et al., 1998).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Materials and methods > Animals
What the sources say
- Not checked yetcites Lebrand et al., 1998 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
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None of the sources cited for this claim have been checked yet.
In the paper
“By combining fMOST (Gong et al., 2016) and the dual-AAV sparse labeling system (Lin et al., 2018), our strategy ensures that we are precisely tracing genetically defined individual serotonin neurons and their projections across the whole brain.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
What the sources say
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- It may state two separate claims as one. 66
- The quote only partly states this claim. 1
- Probably not a substantial claim. 16
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“TFs associated with neurodevelopmental disorders, such as Npas1 and Npas3 (Erbel-Sieler et al., 2004), are preferentially expressed in DR-6, and Aff2 (Mondal et al., 2012) is enriched within DR-3.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Corticotropin-releasing hormone (Crh) is highly expressed in the DR-3 cluster but much less everywhere else (7% serotonin neurons).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“The chemokine ligand-12 (Cxcl12) and cadherin-6 (Cdh6) are preferentially expressed in MR-1 and DR-4 clusters, respectively.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Npas3 is specifically expressed in the DR-6 cluster and is highly correlated with Htr1d, suggesting a critical role of maintaining the characteristics of DR-6 serotonin neurons.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“The majority of the clusters express Slc17a8, which encodes vesicular glutamate transporter-3 (Vglut3). These include almost all serotonin neurons from the cDR, the majority from MR clusters (Domonkos et al., 2016), and DR-3–6 clusters (Figure 1D).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“In contrast to DR, the anatomical organization of the molecular features that define MR clusters is less obvious and different clusters appear more intermingled.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
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In the paper
“Cluster 6 marker Npas1+ was largely excluded from the densest portion of Tph2 expression at the midline and instead was found scattered in the more rostral and ventral portion of the lateral wings.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
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In the paper
“Finally, all serotonin neurons express at least one type of serotonin receptors, with the Gi-coupled Htr1 subfamily in particular Htr1a being the most widely expressed.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Two MR clusters express Gad2 but not Gad1, and cDR expresses neither.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Htr1a is highly expressed in the MR-4 cluster, which does not express other serotonin receptors.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“Within the DR, Trh+, Gad1+, and Gad2+ serotonin neurons were mainly located in the dorsal DR, whereas Slc17a8+ (also known as Vglut3, used hereafter) and Syt2+ serotonin neurons were mainly located in the ventral DR and cDR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
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In the paper
“For example, Bcl11a and Bcl11b (also named Ctip1 and Ctip2) (Chen et al., 2008; Wiegreffe et al., 2015) are highly enriched in DR-3 and MR-4, respectively.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“On the other hand, Crhr2, which should be expressed in all DR serotonin neuron clusters except Cluster 1 and 6 (Figure 1D), was localized preferentially near the midline and was absent from the lateral wing.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
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In the paper
“Another neuropeptide receptor enriched cluster is MR-3, expressing Tacr3, cannabinoid receptor 1(Cnr1), somatostatin receptor-1 (Sstr1), prolactin-releasing hormone receptor (Prlhr), and neuromedin B receptor (Nmbr).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
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In the paper
“In the pDR, Vglut3+ serotonin neurons were mainly located ventrally, whereas Gad2+ serotonin neurons were mainly located dorsally, consistent with our previous study (Ren et al., 2018) and the HCR-smFISH results (Figure 2).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“Instead, Trh+ serotonin axons project to the anterior and medial hypothalamus, posterior amygdala, and the lateral geniculate nucleus in the thalamus, none of which were targeted by Vglut3+ axons (Figure 6D).”
- Also stated in: § Abstract · plain
“Whole-brain axonal projection mapping revealed that DR serotonin neurons co-expressing vesicular glutamate transporter-3 preferentially innervate the cortex, whereas those co-expressing thyrotropin-releasing hormone innervate subcortical regions in particular the hypothalamus.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
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- Also stated in: § Abstract · plain
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In the paper
“Two cells had substantial branches to the striatum, and one to the pons (>10% axon length).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 6- Asserted: passes — The authors put it forward as true.
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In the paper
“Complete morphological reconstruction revealed that the projection pattern of individual DR serotonin neurons was highly diverse yet follow some general patterns”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 14- Asserted: passes — The authors put it forward as true.
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In the paper
“two cortex-projecting serotonin neurons also sent substantial branches to the pons (>10% of axon length), and also innervated the cerebellum.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 2- Asserted: passes — The authors put it forward as true.
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In the paper
“subcortical regions primarily in thalamus (zona incerta and medial geniculate) and hypothalamus (anterior and dorsomedial nuclei) were preferentially targeted by Trh+ axons and largely avoided by the Vglut3+ population”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal projections of selected serotonin neuron subpopulations
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In the paper
“None of them had collateralization in the cortical regions.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
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In the paper
“By contrast, Trh+ axons, which originated preferentially from the lateral wing of pDR, were largely absent from these structures.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal projections of selected serotonin neuron subpopulations
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In the paper
“As predicted, Vglut3+Sert+ GFP cells were mostly located in the ventral pDR (Figure 6B), whereas Trh+Sert+ cells were located in the dorsal pDR (Figure 6C).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
plaincorrelationaln = 3- Asserted: passes — The authors put it forward as true.
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In the paper
“this group had the most complex branching pattern, with various combinations of target regions”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plaincorrelationaln = 17- Asserted: passes — The authors put it forward as true.
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In the paper
“Notable examples include anterior bed nucleus of stria terminalis (BNST), posterior amygdala, and globus pallidus external segment (GPe) in Trh+ projections, as well as the lateral central amygdala (CeA) and dentate nucleus of the cerebellum for Vglut3+ projections.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal projections of selected serotonin neuron subpopulations
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In the paper
“Axons from both populations followed similar initial trajectories and were observed in shared structures along the length of the median forebrain bundle (Figure 7C,D; Figure 7—figure supplements 1–3; Figure 7—Video 1).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal projections of selected serotonin neuron subpopulations
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“One cell had substantial branches to the cortical regions and two to the hypothalamus.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainn = 5- Asserted: passes — The authors put it forward as true.
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In the paper
“individual brains from the same genotype exhibit considerable variation in total axons labeled (Figure 7E top) and in detailed projection patterns”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal projections of selected serotonin neuron subpopulations
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In the paper
“serotonin neurons from DR-1–3 clusters are preferentially localized in dorsal pDR, whereas those from DR-4–6 in ventral pDR, with DR-6 neurons preferentially localized to the ventral lateral wings.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
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In the paper
“Comparing marker genes enriched in R1–R3-derived serotonin neurons from Okaty et al. and MR-1–MR-4 transcriptomic clusters from our current study (Figure 3—figure supplement 4) indeed suggests an approximate correspondence: R1-derived serotonin neurons correspond to our MR-1 cluster, R2 to MR-4 cluster, and R3 to both MR-2 and MR-3 clusters.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Okaty et al., 2015 source
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In the paper
“The cortical-projecting serotonin neurons can have elaborate arborization patterns across multiple cortical areas (e.g., Figure 8—figure supplement 1C) and the longest total axon lengths per cell (Figure 8H).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
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In the paper
“Using viral-genetic intersectional approaches to access specifically Vglut3+ pDR serotonin neurons in combination with staining in histological sections (Figure 6) and iDISCO-based whole brain imaging (Figure 7), we found that these neurons project profusely to cover much of the neocortex, as well as the olfactory bulb, cortical amygdala, and lateral hypothalamus.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and projection-defined serotonin sub-systems
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In the paper
“All cDR serotonin neurons co-express Vglut3, and express several unique markers (Figure 3—figure supplement 2).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
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In the paper
“Our transcriptome data suggest that each DR/MR serotonin neuron type can be distinguished from others by the expression of two marker genes (Figure 1D; Figure 3—figure supplement 1–3), supporting the view that neuronal subtypes are generally specified by unique combination of genes rather than single genes (Li et al., 2017).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and projection-defined serotonin sub-systems
What the sources say
- Not checked yetcites Li et al., 2017
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In the paper
“Our single-cell transcriptomic analysis indicated that serotonin neurons in the cDR are strikingly homogenous and profoundly different from both the pDR and MR at the molecular level (Figure 1, Figure 4, Figure 4—figure supplement 1).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
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In the paper
“Based on tissue source from which scRNA-seq data was collected and fluorescent in situ hybridization using transcriptomic cluster markers, we were able to assign six types to principal DR (pDR), one type to caudal DR (cDR), and four types to MR (Figure 3).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
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In the paper
“We found that Trh+ serotonin neurons predominantly project to subcortical regions, most notably anterior and medial nuclei of the hypothalamus and several thalamic nuclei, a pattern mostly complementary to the Vglut3+ population (Figures 6–7, Figure 7—Video 1).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and projection-defined serotonin sub-systems
plaincorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“By contrast, we could not discern obvious difference in spatial distributions among the four MR types, despite the fact that MR serotonin neurons have heterogenous developmental origin (Jensen et al., 2008).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Jensen et al., 2008 source
hedged- Asserted: passes — The authors put it forward as true.
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In the paper
“The rest of the DR serotonin neurons were divided into thalamus-projecting and brainstem/cerebellum-projecting groups based on the highest density of axons (Figure 8—figure supplement 3B,C), one of which likely projecting to the spinal cord (brain 36) as previously reported (Bowker et al., 1981; Bowker et al., 1982).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
What the sources say
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
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In the paper
“As a specific example, most forebrain-projecting DR serotonin neurons pass through the lateral hypothalamus to reach their targets; it is thus difficult to determine whether axons in the lateral hypothalamus play a local function.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“One cell had axons that were almost equally distributed in the bed nucleus of stria terminalis (BNST), basal lateral amygdala, basal medial amygdala, and medial amygdala (MeA), and had substantial branches to the hypothalamus (>10% axon length).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
plainSingle case- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Gene expression patterns of specific serotonin neuron clusters can in principle allow genetic access to these specific subpopulations for anatomical tracing, physiological recording, and functional perturbation (Luo et al., 2018).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
What the sources say
- Not checked yetcites Luo et al., 2018 source
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In summary, our HCR-smFISH experiments support the notion that Clusters 1–6 correspond to pDR serotonin neurons, Cluster 7 corresponds to cDR serotonin neurons, and Clusters 8–11 correspond to MR serotonin neurons.”
- Also stated in: § Abstract · plain
“Systematic in situ hybridization mapped specific clusters to the principal DR, caudal DR, or MR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
- Also stated in: § Abstract · plain
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In summary, the DR and MR serotonin neurons have diverse expression pattern of neuropeptide receptors, indicating that they are subject to complex modulation by a host of neuropeptides.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“It has been reported that vesicular monoamine transporters (Slc8a1 for Vmat1; Slc8a2 for Vmat2) can transport GABA into synaptic vesicles (Stensrud et al., 2014), and virtually all serotonin neurons expressed Vmat2 (Figure 1—figure supplement 1D; Figure 4A left).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
What the sources say
- Not checked yetcites Stensrud et al., 2014 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“These data suggest that Clusters 1–3 correspond to the dorsal DR and Cluster 4–6 to the ventral DR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Based on our scRNA-seq and HCR-smFISH results, the Vglut3+ and Trh+ pDR serotonin neurons consist of largely complementary cell types at the transcriptomic level and have a distinct distribution along the dorsal–ventral axis in the pDR.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
plaincorrelationaln = 3- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Anti-Tph2 staining on the brain slices containing pDR showed that 98.5% GFP+ neurons are Tph2+ and 100% Tph2+ neurons are GFP+ (Figure 5B).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“However, DR and MR contain not only serotonin neurons but also GABAergic and glutamatergic neurons that do not express Tph2 (and hence do not release serotonin), some of which may project to the same target regions (McDevitt et al., 2014).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Viral-genetic tools to access different serotonin neuron subtypes
What the sources say
- Not checked yetcites McDevitt et al., 2014 source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Transcription factors (TFs) have been shown to be the best molecular feature for cell type definition (Schaum et al., 2018).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Molecular properties of MR and DR serotonin neurons
What the sources say
- Not checked yetcites Schaum et al., 2018 source
boostedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Thus, these observations support the anatomical breakdown suggested by the dissection of primary tissue, and additionally provide a more granular and detailed description about finer boundaries.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“DR serotonin neurons derive entirely from rhombomere 1 of the developing mouse brain, whereas MR serotonin neurons derive predominantly from rhombomeres 1, 2, and 3 (Alonso et al., 2013; Bang et al., 2012; Jensen et al., 2008).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
What the sources say
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Evidence has suggested that the DR and MR serotonin systems differ in developmental origin, connectivity, physiology, and behavioral function (Alonso et al., 2013; Calizo et al., 2011; Okaty et al., 2019).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
What the sources say
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“The MR serotonin neurons project to structures near the midline, whereas the DR serotonin neurons target more lateral regions (Jacobs and Azmitia, 1992; Muzerelle et al., 2016; Vertes, 1991; Vertes et al., 1999).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
What the sources say
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Groups B1–B3 are located in the medulla and provide descending serotonergic innervation to the spinal cord and other parts of the medulla. Groups B4–B9 are located in the pons and midbrain, including the dorsal raphe (DR; groups B6 and B7) and median raphe (MR; groups B5 and B8) nucleus, and provide ascending innervation to the forebrain and midbrain.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
What the sources say
- Not checked yetcites Dahlström and Fuxe, 1964
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“As a specific example, we recently found that DR serotonin neurons that project to frontal cortex and amygdala constitute two sub-systems with distinct cell body locations, axonal collateralization patterns, biased inputs, physiological response properties, and behavioral functions (Ren et al., 2018).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
What the sources say
- Not checked yetcites Ren et al., 2018 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“In neural circuits where cell types have been well studied by anatomical and physiological methods, there is an excellent correspondence between cell types defined by transcriptomes and the classical methods (Li et al., 2017; Shekhar et al., 2016).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
What the sources say
- Not checked yetcites Li et al., 2017
- Not checked yetcites Shekhar et al., 2016 source
boostedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Serotonin neurons in the central nervous system are spatially clustered in the brainstem, originally designated as groups B1–B9 (Dahlström and Fuxe, 1964).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Introduction
What the sources say
- Not checked yetcites Dahlström and Fuxe, 1964
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Collectively,~12,000 serotonin neurons from the DR and MR in mice (~0.015% of all CNS neurons) innervate the entire forebrain (Ishimura et al., 1988) and modulate diverse physiological and behavioral functions.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion
What the sources say
- Not checked yetcites Ishimura et al., 1988 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“The MR serotonin neurons derive from three separate rhombomeres (R1–R3), and Okaty et al. sampled these three populations separately, allowing us to ask the question of whether developmental origins correspond to transcriptomic clusters in adult.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Okaty et al., 2015 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“By searching Allen Brain Institute development brain database and using multiplex fluorescent in situ hybridization (ML-FISH), Kast et al. (2017) found that the cDR expressed distinct gene markers comparing to pDR, and tracing from these neurons showed cDR was different from the MR and DR in efferent innervation.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Kast et al., 2017 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The cDR has been suggested to be more similar to the MR than to the pDR in afferent innervation (Commons, 2015).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Commons, 2015 source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“In our previous study, we characterized two projection-defined parallel DR serotonin sub-systems.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and projection-defined serotonin sub-systems
What the sources say
- Not checked yetcites Ren et al., 2018 source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
In the paper
“We found that serotonin neurons that project to the orbitofrontal cortex (OFC) and central amygdala (CeA) differ in input and output patterns, physiological response properties, and behavioral functions (Ren et al., 2018).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and projection-defined serotonin sub-systems
What the sources say
- Not checked yetcites Ren et al., 2018 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Compared to droplet-based platform of the two studies, our FACS-based scRNA-seq platform allowed more sequencing depth per cell (Figure 1—figure supplement 1B) and sequencing larger number of cells, accounting for our finer classification of transcriptomic types of serotonin neurons.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, our single-cell reconstruction of DR serotonin neurons revealed many more than six branching patterns (e.g., Figure 8G), indicating that there must be diverse collateralization patterns even within the same transcriptomic cluster, and highlighting the complexity of individual serotonin neuron projections.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“These data support and extend our previous finding (Ren et al., 2018) for the preferential ventral pDR location of Vglut3+ serotonin neurons, which is highly expressed in DR-4 and DR-5 clusters.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Ren et al., 2018 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Because DR serotonin neurons derive exclusively from rhombomere 1 (R1), and the single-cell RNA-seq data was obtained from just 8 cells, the Okaty et al. dataset is limited in providing information about heterogeneity within DR serotonin neurons.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and cell body distribution
What the sources say
- Not checked yetcites Okaty et al., 2015 source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Forebrain-projecting serotonin neurons have been estimated to have very long axons based on the total serotonin fiber density and number of serotonin neurons (Wu et al., 2014).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Whole-brain axonal arborization patterns of individual serotonin neurons
What the sources say
- Not checked yetcites Wu et al., 2014
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Given that CeA-projecting DR serotonin neurons do not innervate most of the hypothalamus (Ren et al., 2018), and Trh+ serotonin neurons only partially innervate CeA, these two populations are at most partially overlapping.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Relationship between molecular identity and projection-defined serotonin sub-systems
What the sources say
- Not checked yetcites Ren et al., 2018 source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“For example, several studies have reported that subgroups of serotonin neurons in the MR and DR express Vglut3 and indeed, subsequent slice recording confirmed that serotonin terminals can co-release glutamate and serotonin (Domonkos et al., 2016; Liu et al., 2014; Ren et al., 2018; Sengupta et al., 2017; Varga et al., 2009; Wang et al., 2019).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Integrating multiple features within individual serotonin sub-systems
What the sources say
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We have shown that the molecular features of these distinct serotonin groups reflect their anatomical organization and provide tools for future exploration of the full projection map of molecularly defined serotonin groups.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Integrating multiple features within individual serotonin sub-systems
boostedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“While the reported projection and arborization complexity of individual DR neurons appear qualitatively similar to our findings, these studies cannot be directly compared because the Gagnon and Parent study did not validate the serotonin identity of individually traced DR neurons, which could include Tph2-negative long-distance projecting GABAergic and glutamatergic neurons (Bang and Commons, 2012”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Insights from single-cell reconstruction
What the sources say
- Not checked yetcites Gagnon and Parent, 2014
- Not checked yetcites Bang and Commons, 2012
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“which suggests that these serotonin neurons use glutamate as co-transmitter in their cortical targets, and are in turn modulated by corticotropin-releasing hormone and neuropeptide Y.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Integrating multiple features within individual serotonin sub-systems
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Our previous study suggests that DR serotonin sub-systems have biased input but segregated output (Ren et al., 2018).”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Integrating multiple features within individual serotonin sub-systems
What the sources say
- Not checked yetcites Ren et al., 2018 source
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In conclusion, our comprehensive transcriptomic dataset and identification of 11 distinct groups of the DR and MR serotonin neurons have revealed the molecular heterogeneity of the forebrain-projecting serotonin system.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Integrating multiple features within individual serotonin sub-systems
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“All procedures followed animal care and biosafety guidelines approved by Stanford University’s Administrative Panel on Laboratory Animal Care and Administrative Panel of Biosafety in accordance with NIH guidelines.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Materials and methods > Animals
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“The reconstructed neurons were checked by one another person.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Materials and methods > Single Cell Reconstruction
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The molecular architecture of serotonin system lays the foundation for integrating anatomical, neurochemical, physiological, and behavioral functions.”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Discussion > Integrating multiple features within individual serotonin sub-systems
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: fails — It may be too vague to check against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. It may be too vague to check against evidence. The paper’s conclusions may not depend on it.
The paper relies on this without support.
The heterogeneity of DR and MR serotonin neurons must be reflected at the molecular level.
“Ultimately, the heterogeneity of DR and MR serotonin neurons must be reflected at the molecular level.”
The paper relies on this without support.
The DR contains approximately 9000 serotonin neurons.
“our study is still limited by the scope (50 reconstructed cells out of 9000 DR serotonin neurons).”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the citing paper
“Those in the dorsal raphe project widely throughout the cortex and increase or decrease their activity to reward and punish, respectively.76,78”
From Synaptic and circuit functions of multitransmitter neurons in the mammalian brain (2023) · cites this paper as [76]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Rated minor: it would not touch a result — a value no result rests on, a p-value that stays on the same side of the significance level, or a conflict that is clerical, resolved elsewhere in the paper, or outside its own findings.
In the paper
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Results > Anatomical organization of transcriptomically defined serotonin clusters
“Slc17a8+ (also known as Vglut3, used hereafter)”
§ Single-cell transcriptomes and whole-brain projections of serotonin neurons in the mouse dorsal and median raphe nuclei > Materials and methods > Animals
“The Vglut3-Cre (also known as Slc18a8-Cre; JAX Strain 18147)”
Citations
Cites
STAR: ultrafast universal RNA-seq aligner
Dobin, A., Davis, C. A., Schlesinger, F., Drenkow, J., Zaleski, C., Jha, S., Batut, P., Chaisson, M., & Gingeras, T. R. (2013) · Bioinformatics · doi:10.1093/bioinformatics/bts635 · Cited by 51,709
HTSeq—a Python framework to work with high-throughput sequencing data
Anders, S., Pyl, P. T., & Huber, W. (2015) · Bioinformatics · doi:10.1093/bioinformatics/btu638 · Cited by 21,464 · cited 1×
“2 (Anders et al., 2015) with default parameters, except ‘stranded’ was set to ‘false’, and ‘mode’ was set to ‘intersection-nonempty’.”
Comprehensive Integration of Single-Cell Data
Stuart, T., Butler, A., Hoffman, P., Hafemeister, C., Papalexi, E., Mauck, W. M., Hao, Y., Stoeckius, M., Smibert, P., & Satija, R. (2019) · Cell · doi:10.1016/j.cell.2019.05.031 · Cited by 15,453
Integrating single-cell transcriptomic data across different conditions, technologies, and species
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3D U-Net: Learning Dense Volumetric Segmentation from Sparse Annotation
Çiçek, Ö., Abdulkadir, A., Lienkamp, S. S., Brox, T., & Ronneberger, O. (2016) · Lecture Notes in Computer Science · doi:10.1007/978-3-319-46723-8_49 · Cited by 7,945
Highly parallel genome-wide expression profiling of individual cells using nanoliter droplets.
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A robust and high-throughput Cre reporting and characterization system for the whole mouse brain
Madisen, L., Zwingman, T. A., Sunkin, S. M., Oh, S. W., Zariwala, H. A., Gu, H., Ng, L. L., Palmiter, R. D., Hawrylycz, M. J., Jones, A. R., et al. (2010) · Nature Neuroscience · doi:10.1038/nn.2467 · Cited by 6,907 · cited 3×
“The Ai14 tdTomato Cre reporter mice (JAX Strain 7914) Ren et al. eLife 2019;8:e49424.”
BackgroundInfluentialFull-length RNA-seq from single cells using Smart-seq2
Picelli, S., Faridani, O. R., Björklund, Å. K., Winberg, G., Sagasser, S., & Sandberg, R. (2014) · Nature Protocols · doi:10.1038/nprot.2014.006 · Cited by 4,137 · cited 1×
“cDNA synthesis and library preparation were performed using the Smart-seq2 protocol (Picelli et al., 2014).”
MethodCell types in the mouse cortex and hippocampus revealed by single-cell RNA-seq
Zeisel, A., Muñoz-Manchado, A. B., Codeluppi, S., Lönnerberg, P., La Manno, G., Juréus, A., Marques, S., Munguba, H., He, L., Betsholtz, C., et al. (2015) · Science · doi:10.1126/science.aaa1934 · Cited by 3,124 · cited 1×
“…powerful tool for unbiased identification of transcriptomic cell types in the brain (Darmanis et al., 2015; Li et al., 2017; Mickelsen et al., 2019; Rosenberg et al., 2018; Saunders et al., 2018; Tasic et al., 2016; Tasic et al., 2018; Welch et al., 2019; Zeisel et al., 2018; Zeisel et al., 2015).”
MethodSingle-cell transcriptomics of 20 mouse organs creates a Tabula Muris
The Tabula Muris Consortium, coordination, O., coordination, L., processing, O. C. A., sequencing, L. P. A., analysis, C. D., annotation, C. T., Writing group, Supplemental text writing group, & Principal investigators (2018) · Nature · doi:10.1038/s41586-018-0590-4 · Cited by 2,842 · cited 3×
“Transcription factors Transcription factors (TFs) have been shown to be the best molecular feature for cell type definition (Schaum et al., 2018).”
BackgroundMethodInfluential
Research works printed but not linked: 1
- Çiçek, 2016, Medical Image Computing and Computer-Assisted Intervention – MICCAI 2016. MICCAI 2016. Lecture Notes in Computer Science, 9901
Cited by
Sorted by citations
A high-resolution transcriptomic and spatial atlas of cell types in the whole mouse brain
Yao, Z., van Velthoven, C. T. J., Kunst, M., Zhang, M., McMillen, D., Lee, C., Jung, W., Goldy, J., Abdelhak, A., Aitken, M., et al. (2023) · Nature · doi:10.1038/s41586-023-06812-z · Cited by 1,203
Molecularly defined and spatially resolved cell atlas of the whole mouse brain
Zhang, M., Pan, X., Jung, W., Halpern, A. R., Eichhorn, S. W., Lei, Z., Cohen, L., Smith, K. A., Tasic, B., Yao, Z., et al. (2023) · Nature · doi:10.1038/s41586-023-06808-9 · Cited by 531
“Serotonergic neurons were enriched in the raphe nuclei (dorsal nucleus raphe, nucleus raphe pontis and nucleus raphe magnus) in the midbrain and hindbrain 30 (Extended Data Fig.”
What is a cell type and how to define it?
Zeng, H. (2022) · Cell · doi:10.1016/j.cell.2022.06.031 · Cited by 439
Single-cell and spatial transcriptomics: deciphering brain complexity in health and disease
Piwecka, M., Rajewsky, N., & Rybak-Wolf, A. (2023) · Nature Reviews Neurology · doi:10.1038/s41582-023-00809-y · Cited by 320
Population-scale single-cell RNA-seq profiling across dopaminergic neuron differentiation
Jerber, J., Seaton, D. D., Cuomo, A. S. E., Kumasaka, N., Haldane, J., Steer, J., Patel, M. J., Pearce, D., Andersson, M. H. L., Bonder, M. J., et al. (2021) · Nature Genetics · doi:10.1038/s41588-021-00801-6 · Cited by 293
Metadata
- Authors
- Ren, J., Isakova, A., Friedmann, D., Zeng, J., Grutzner, S. M., Pun, A., Zhao, G. Q., Kolluru, S. S., Wang, R., Lin, R., Li, P., Li, A., Raymond, J. L., Luo, Q., Luo, M., Quake, S. R., & Luo, L.
- Affiliations
- Howard Hughes Medical Institute (US)
- Stanford University (US)
- National Institute of Biological Sciences, Beijing (CN)
- Stanford Medicine (US)
- Wuhan National Laboratory for Optoelectronics (CN)
- Chan Zuckerberg Biohub San Francisco (US)
- Corresponding author
- Ren, Jing
- Quake, Stephen R
- Luo, Liqun
- ORCID
- Venue
- eLife
- Publisher
- eLife Sciences Publications, Ltd
- Published
- 2019-10-24
- Volume
- 8
- ISSN
- 2050-084X (ISSN-L)
- PMC
- PMC6812963
- OpenAlex
- W2982239238
- Semantic Scholar
- 73c6ef27934225685f1623abe2f5530230da5ad5
- Cited by
- 304
- References
- 97
- Citations by year
- 2026: 32 · 2025: 52 · 2024: 50 · 2023: 59 · 2022: 42 · 2021: 41 · 2020: 25 · 2019: 2
- FWCI
- 9.10
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- eLife (publishedVersion, cc-by)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Institutes of Health (R01 NS104698, NS057488)
- National Science Foundation (NeuroNex)
- Ministry of Science and Technology of the People's Republic of China (2015BAI08B02)
- National Natural Science Foundation of China (91432114, 91632302)
- Beijing Municipal Government
- NSFC (61721092, 81827901)
- Swiss National Science Foundation (PostDoc Mobility Fellowship)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Single-cell and spatial transcriptomics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Keywords
- serotonergic neurons, dorsal raphe nucleus, median raphe nucleus, single-cell transcriptomics, neuronal heterogeneity, VGLUT3, thyrotropin-releasing hormone, hypothalamus, neuropeptides, single-neuron reconstruction, mice
- MeSH terms
- Animals, Brain Mapping, Neural Pathways, Raphe Nuclei, Sequence Analysis, RNA, Mice, Single-Cell Analysis, Serotonergic Neurons, Transcriptome
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
A language model drew the claims from the paper on 2026-10-09, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).
A second model labelled each claim on 2026-10-09 (model jev-1.13-20260917, definition revision gold-guideline-v0.2).
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
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