Molecular and cellular processes disrupted in the early postnatal Down syndrome prefrontal cortex

May combine two claims.

This transition was accompanied by reduced activity of myelin-associated gene networks and diminished regulon activity of key transcriptional regulators, including MYRF and NKX6-2, which serve as central regulators of myelin gene expression programs.

“This transition was accompanied by reduced activity of myelin-associated gene networks and diminished regulon activity of key transcriptional regulators, including MYRF and NKX6-2, which serve as central regulators of myelin gene expression programs (53-55) (Fig. 5J).”

• cites [53] 53. Bujalka H, Koenning M, Jackson S, Perreau VM, Pope B, Hay CM, Mitew S, Hill AF, Lu QR, Wegner M, Srinivasan R, Svaren J, Willingham M, Barres BA, Emery B, MYRF Is a Membrane-Associated Transcription Factor That Autoproteolytically Cleaves to Directly Activate Myelin Genes. PLOS Biology 11, e1001625 (2013). [PubMed: 23966833] sourcePartly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured
• cites [54] 54. Hornig J, Fröb F, Vogl MR, Hermans-Borgmeyer I, Tamm ER, Wegner M, The Transcription Factors Sox10 and Myrf Define an Essential Regulatory Network Module in Differentiating Oligodendrocytes. PLoS Genet 9, e1003907 (2013). [PubMed: 24204311] sourcePartly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured
• cites [55] 55. Southwood C, He C, Garbern J, Kamholz J, Arroyo E, Gow A, CNS Myelin Paranodes Require Nkx6-2 Homeoprotein Transcriptional Activity for Normal Structure. J Neurosci 24, 1121511225 (2004). [PubMed: 15601927] sourceDisputed

  Split into 2 atoms — 0 confirmed, 1 partially supported, 1 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  Checked by a reasoning model — may be wrong.

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Down syndrome results from trisomy 21 and is one of the most common genetic causes of intellectual disability.

“Down syndrome (DS), resulting from trisomy 21 (Ts21), is one of the most common genetic causes of intellectual disability (1).”

• cites [1] 1. Karam SM, Riegel M, Segal SL, Félix TM, Barros AJD, Santos IS, Matijasevich A, Giugliani R, Black M, Genetic causes of intellectual disability in a birth cohort: a population-based study. Am J Med Genet A 167, 1204-1214 (2015). [PubMed: 25728503] sourcePartly supported

  The Results say Down syndrome was the most frequent genetic cause of intellectual disability in the cohort, and the Discussion calls it the most common genetic cause of intellectual disability. Our copy classifies Down syndrome as a chromosomal disorder but does not state that it results from trisomy 21 (searched: “trisomy 21” and “trisomy”). The indexed passages provide section labels but no page numbers. (LLM, conf=0.87)

  Experimental — accuracy not yet measured

May combine two claims.

The DS neurodevelopmental phenotype encompasses deficits in executive function, working memory, motor coordination, and linguistic processing that emerge within the first postnatal months and influence academic, occupational, and adaptive functioning trajectories throughout the lifespan.

“This neurodevelopmental phenotype encompasses deficits in executive function, working memory, motor coordination, and linguistic processing - impairments that emerge within the first postnatal months and profoundly influence academic, occupational, and adaptive functioning trajectories throughout the lifespan (2-5).”

• cites [2] 2. Lott IT, Dierssen M, Cognitive deficits and associated neurological complications in individuals with Down's syndrome. The Lancet Neurology 9, 623-633 (2010). [PubMed: 20494326] sourceNot checked — no full text of the source
• cites [3] 3. Jain PD, Nayak A, Karnad SD, Doctor KN, Gross motor dysfunction and balance impairments in children and adolescents with Down syndrome: a systematic review. Clin Exp Pediatr 65, 142-149 (2021). [PubMed: 34126707] sourcePartly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured
• cites [4] 4. Martin GE, Klusek J, Estigarribia B, Roberts JE, Language Characteristics of Individuals with Down Syndrome. Top Lang Disord 29, 112-132 (2009). [PubMed: 20428477] sourcePartly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured
• cites [5] 5. Antonarakis SE, Skotko BG, Rafii MS, Strydom A, Pape SE, Bianchi DW, Sherman SL, Reeves RH, Down syndrome. Nat Rev Dis Primers 6, 9 (2020). [PubMed: 32029743] sourcePartly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured

May combine two claims.

SynGO analysis identified Ts21-downregulated DEGs encoding proteins predominantly localized to the postsynaptic density (PSD) membrane, with functional roles enriched for synaptic organization.

“SynGO (30) analysis identified Ts21-downregulated DEGs encoding proteins predominantly localized to the postsynaptic density (PSD) membrane, with functional roles enriched for synaptic organization (Fig. 3F, fig. S9 and table S6).”

• cites [30] 30. Koopmans F, van Nierop P, Andres-Alonso M, Byrnes A, Cijsouw T, Coba MP, Cornelisse LN, Farrell RJ, Goldschmidt HL, Howrigan DP, Hussain NK, Imig C, de Jong APH, Jung H, Kohansalnodehi M, Kramarz B, Lipstein N, Lovering RC, MacGillavry H, Mariano V, Mi H, Ninov M, Osumi-Sutherland D, Pielot R, Smalla K-H, Tang H, Tashman K, Toonen RFG, Verpelli C, Reig-Viader R, Watanabe K, van Weering J, Achsel T, Ashrafi G, Asi N, Brown TC, De Camilli P, Feuermann M, Foulger RE, Gaudet P, Joglekar A, Kanellopoulos A, Malenka R, Nicoll RA, Pulido C, de Juan-Sanz J, Sheng M, Südhof TC, Tilgner HU, Bagni C, sourceSupported

May combine two claims.

The early postnatal period (0-3 years) is a critical window of synaptogenesis, neuronal and glial maturation, and developmental neuroimmune interactions.

“during the early postnatal period (0-3 years), a critical window of synaptogenesis, neuronal and glial maturation, and developmental neuroimmune interactions (11).”

• cites [11] 11. Silbereis JC, Pochareddy S, Zhu Y, Li M, Sestan N, The Cellular and Molecular Landscapes of the Developing Human Central Nervous System. Neuron 89, 248-268 (2016). [PubMed: 26796689] sourcePartly supported

  In “Neural circuit assembly, maturation, and developmental plasticity” (page unavailable), the paper describes rapid synaptogenesis in the first two postnatal years and marked neuronal growth in the first year. “Glial cell genesis and differentiation” (page unavailable) describes glial development continuing after birth. These passages support early postnatal synaptogenesis and neuronal and glial maturation, but the copy does not establish developmental neuroimmune interactions as part of the claimed 0–3-year window. (LLM, conf=0.85)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

Astrocytes play a critical role in the pathophysiology of both DS and AD.

“Accumulating evidence has underscored the critical role of astrocytes in the pathophysiology of both DS (56) and AD (57).”

• cites [56] 56. Ponroy Bally B, Murai KK, Astrocytes in Down Syndrome Across the Lifespan. Front. Cell. Neurosci. 15 (2021). sourceSupported
• cites [57] 57. Habib N, McCabe C, Medina S, Varshavsky M, Kitsberg D, Dvir-Szternfeld R, Green G, Dionne D, Nguyen L, Marshall JL, Chen F, Zhang F, Kaplan T, Regev A, Schwartz M, Disease-associated astrocytes in Alzheimer's disease and aging. Nat Neurosci 23, 701-706 (2020). [PubMed: 32341542] sourceSupported

May combine two claims.

These laminar and cellular imbalances may contribute to the circuit-level pathophysiology observed in Ts21, potentially reflecting disrupted, aberrant cortical connections and altered neuroglial interactions during the early postnatal period.

“These laminar and cellular imbalances may contribute to the circuit-level pathophysiology observed in Ts21 (21), potentially reflecting disrupted, aberrant cortical connections and altered neuroglial interactions during the early postnatal period.”

• cites [21] 21. Bartesaghi R, Brain circuit pathology in Down syndrome: from neurons to neural networks. Reviews in the Neurosciences 34, 365-423 (2023). [PubMed: 36170842] sourceSupported

May combine two claims.

These findings underscore a global epigenetic rewiring beyond localized chromosomal effects, aligning with prior observations of genomewide Ts21 chromatin reorganization.

“These findings underscore a global epigenetic rewiring beyond localized chromosomal effects, aligning with prior observations of genomewide Ts21 chromatin reorganization (24-26).”

• cites [24] 24. Meharena HS, Marco A, Dileep V, Lockshin ER, Akatsu GY, Mullahoo J, Watson LA, Ko T, Guerin LN, Abdurob F, Rengarajan S, Papanastasiou M, Jaffe JD, Tsai L-H, Down Syndrome Induced Senescence Disrupts the Nuclear Architecture of Neural Progenitors. Cell Stem Cell 29, 116-130.e7 (2022). [PubMed: 34995493] sourceSupported
• cites [25] 25. Guo Z, Zhu Y, Xiao H, Dai R, Yang W, Xue W, Zhang X, Hao B, Liao S, Integration of ATAC-seq and RNA-seq identifies MX1-mediated AP-1 transcriptional regulation as a therapeutic target for Down syndrome. Biological Research 56, 67 (2023). [PubMed: 38066591] sourceSupported
• cites [26] 26. Marderstein AR, De Zuani M, Moeller R, Bezney J, Padhi EM, Wong S, Coorens THH, Xie Y, Xue H, Montgomery SB, Cvejic A, Single-cell multi-omics map of human fetal blood in Down syndrome. Nature 634, 104-112 (2024). [PubMed: 39322663] sourceSupported

May combine two claims.

Striking conservation was found in the ratio of ExN:InN (2.17:1) and the ratio of MGE:CGE InNs (1.4:1) in both control and Ts21 samples.

“Whereas Ts21 mouse models have identified alterations in the balance of ExN and InN (43-45), we found striking conservation in the ratio of ExN:InN (2.17:1) and the ratio of MGE:CGE InNs (1.4:1) in both control and Ts21 samples (Fig. 4B).”

• cites [43] 43. Pérez-Cremades D, Hernández S, Blasco-Ibáñez JM, Crespo C, Nacher J, Varea E, Alteration of inhibitory circuits in the somatosensory cortex of Ts65Dn mice, a model for Down's syndrome. J Neural Transm (Vienna) 117, 445-455 (2010). [PubMed: 20157742] sourcePartly supported

  The Results (p. 447) report increased interneuron density in the somatosensory cortex of Ts65Dn mice, and the introduction (p. 446) discusses an imbalance of excitatory and inhibitory inputs. The paper does not measure an excitatory-to-inhibitory neuron ratio, so it supports the cited background point about altered inhibition but not the more specific claim about ExN:InN balance. The numerical ratios and their conservation are the citing authors’ own finding, not attributed to this source. (LLM, conf=0.84)

  Experimental — accuracy not yet measured
• cites [44] 44. Chakrabarti L, Best TK, Cramer NP, Carney RSE, Isaac JTR, Galdzicki Z, Haydar TF, Olig1 and Olig2 triplication causes developmental brain defects in Down syndrome. Nat Neurosci 13, 927-934 (2010). [PubMed: 20639873] sourceSupported
• cites [45] 45. Hernández-González S, Ballestín R, López-Hidalgo R, Gilabert-Juan J, Blasco-Ibáñez JM, Crespo C, Nácher J, Varea E, Altered distribution of hippocampal interneurons in the murine Down Syndrome model Ts65Dn. Neurochem Res 40, 151-164 (2015). [PubMed: 25399236] sourceNot checked — no full text of the source

Classified as probably not a substantial claim.

Ts21 and control nuclei were annotated independently to minimize integration bias.

“Following batch effect correction (14), Ts21 and control nuclei were annotated independently to minimize integration bias and identify putative Ts21-specific cell subpopulations or states.”

• Also stated in: § snRNA-seq data processing · plain

  “Ts21 and control nuclei were annotated independently to minimize integration bias and identify putative Ts21-specific cell subpopulations or states.”

• cites [14] 14. Korsunsky I, Millard N, Fan J, Slowikowski K, Zhang F, Wei K, Baglaenko Y, Brenner M, Loh P, Raychaudhuri S, Fast, sensitive, and accurate integration of single cell data with Harmony. Nat Methods 16, 1289-1296 (2019). [PubMed: 31740819] sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Dysregulation of the TREM2/APOE axis has been implicated in heightened neuroinflammation, neuronal injury, and complement-mediated synaptic clearance, representing a critical therapeutic target in AD pathology.

“Dysregulation of the TREM2/ APOE axis has been implicated in heightened neuroinflammation, neuronal injury, and complement-mediated synaptic clearance, representing a critical therapeutic target in AD pathology (68).”

• cites [68] 68. Krasemann S, Madore C, Cialic R, Baufeld C, Calcagno N, El Fatimy R, Beckers L, O'Loughlin E, Xu Y, Fanek Z, Greco DJ, Smith ST, Tweet G, Humulock Z, Zrzavy T, Conde-Sanroman P, Gacias M, Weng Z, Chen H, Tjon E, Mazaheri F, Hartmann K, Madi A, Ulrich J, Glatzel M, Worthmann A, Heeren J, Budnik B, Lemere C, Ikezu T, Heppner FL, Litvak V, Holtzman DM, Lassmann H, Weiner HL, Ochando J, Haass C, Butovsky O, The TREM2-APOE pathway drives the transcriptional phenotype of dysfunctional microglia in neurodegenerative diseases. Immunity 47, 566-581.e9 (2017). [PubMed: 28930663] sourcePartly supported

  The Results link the TREM2–APOE pathway to a disease-associated microglial phenotype and report increased inflammatory molecules in plaque-associated microglia. The Abstract reports that targeting the pathway restored homeostatic microglial signatures in AD mouse models and prevented neuronal loss in an acute neurodegeneration model. The copy does not establish complement-mediated synaptic clearance, and its neuronal-loss result is not specific to AD pathology (searched: complement, synaptic clearance). (LLM, conf=0.88)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

AP-1 complex is a dimeric protein assembly critical for immune regulation and a recently identified Ts21 therapeutic target.

“Module 8 was also highly enriched for targets of the transcription factor AP-1 complex, a dimeric protein assembly critical for immune regulation and a recently identified Ts21 therapeutic target (25) (Fig. 6M).”

• cites [25] 25. Guo Z, Zhu Y, Xiao H, Dai R, Yang W, Xue W, Zhang X, Hao B, Liao S, Integration of ATAC-seq and RNA-seq identifies MX1-mediated AP-1 transcriptional regulation as a therapeutic target for Down syndrome. Biological Research 56, 67 (2023). [PubMed: 38066591] sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing).

HLA-DRB1 is a marker consistently elevated in AD.

“This subtype also exhibited increased interferon receptor expression (fig. S16C) and upregulation of MHCII HLA-DRB1 (Fig. 7P), a marker consistently elevated in AD (69).”

• cites [69] 69. Hopperton KE, Mohammad D, Trépanier MO, Giuliano V, Bazinet RP, Markers of microglia in post-mortem brain samples from patients with Alzheimer's disease: a systematic review. Mol Psychiatry 23, 177-198 (2018). [PubMed: 29230021] sourcePartly supported

  The Introduction says MHCII markers are consistently increased in AD brains, and the Results (Major histocompatibility complex II; page unavailable) report higher MHCII in at least one brain region in 36 studies. But the review chiefly measures HLA-DR or multiple HLA isoforms, not HLA-DRB1 specifically; it identifies HLA-DRB1/B5 as genetic risk factors without establishing that HLA-DRB1 itself is consistently elevated. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

The neuropathological substrates of dementia precede clinical onset.

“Whereas it is well-established that the neuropathological substrates of dementia precede clinical onset (79), a central question is the timing of onset of these molecular changes.”

• cites [79] 79. DeTure MA, Dickson DW, The neuropathological diagnosis of Alzheimer's disease. Molecular Neurodegeneration 14, 32 (2019). [PubMed: 31375134] sourcePartly supported

  The Background sections on Preclinical Alzheimer’s disease and Pathology of Alzheimer’s disease state that Alzheimer’s pathology can be present in cognitively normal people and that amyloid and tau pathology can precede later clinical features. This supports the claim for Alzheimer’s disease, but the cited passages do not establish it for dementia generally. (LLM, conf=0.83)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

P-selectin has a role in immune cell modulation and trafficking.

“E-selectin (SELE), a cytokine-induced endothelial adhesion molecule, was uniquely expressed in Ts21 vascular cells (Fig. 7G), whereas P-selectin signaling was elevated in microglia-vascular interactions (Fig. 7H), consistent with its role in immune cell modulation and trafficking (66).”

• cites [66] 66. McEver RP, Selectins: initiators of leucocyte adhesion and signalling at the vascular wall. Cardiovasc Res 107, 331-339 (2015). [PubMed: 25994174] sourceSupported

Classified as probably not a substantial claim. May combine two claims.

ATF7 has a role in epigenetic repression of inflammatory pathways and inhibition of NF-kB signaling.

“This Ts21-specific reduction in ATF7 regulon activity is particularly relevant, given the role of ATF7 in epigenetic repression of inflammatory pathways and inhibition of NF-K β signaling (59), aligning with exacerbated inflammatory signaling in Ts21 astrocytes.”

• cites [59] 59. Huang Y, Ge M-X, Li Y-H, Li J-L, Yu Q, Xiao F-H, Ao H-S, Yang L-Q, Li J, He Y, Kong Q-P, Longevity-Associated Transcription Factor ATF7 Promotes Healthspan by Suppressing Cellular Senescence and Systematic Inflammation. Aging Dis 14, 1374-1389 (2023). [PubMed: 37163432] sourceSupported

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

HSPB1 is a key stress response protein and reactive astrocyte marker that is secreted proximal to amyloid plaques where it exerts non-cell-autonomous neuroprotection through stabilization of proteostasis.

“Of particular interest was the prominent enrichment of HSPB1, a key stress response protein and reactive astrocyte marker that has recently been shown to be secreted proximal to amyloid plaques where it exerts non-cell-autonomous neuroprotection through the stabilization of proteostasis (60).”

• cites [60] 60. Yang F, Beltran-Lobo P, Sung K, Goldrick C, Croft CL, Nishimura A, Hedges E, Mahiddine F, Troakes C, Golde TE, Perez-Nievas BG, Hanger DP, Noble W, Jimenez-Sanchez M, Reactive astrocytes secrete the chaperone HSPB1 to mediate neuroprotection. Sci Adv 10, eadk9884 (2024). [PubMed: 38507480] sourcePartly supported

  The Results report increased extracellular HSPB1 near plaque-associated astrocytes and non-cell-autonomous protection against neuronal injury and tau aggregation. The Discussion proposes that HSPB1 may help maintain neuronal proteostasis, but says its downstream mechanism remains an open question; the claim presents proteostasis stabilization as an established mechanism. (LLM, conf=0.84)

  Experimental — accuracy not yet measured

May combine two claims.

DS is among the select few conditions that encompass both neurodevelopmental and neurodegenerative clinical features, with most individuals demonstrating progressive cognitive impairment by mid-adulthood.

“DS is among the select few conditions that encompass both neurodevelopmental and neurodegenerative clinical features, with most individuals demonstrating progressive cognitive impairment by mid-adulthood (77, 78).”

• cites [77] 77. Larsen FK, Baksh RA, McGlinchey E, Langballe EM, Benejam B, Beresford-Webb J, McCarron M, Coppus A, Falquero S, Fortea J, Levin J, Loosli SV, Mark R, Rebillat A, Zaman S, Strydom A, Age of Alzheimer's disease diagnosis in people with Down syndrome and associated factors: Results from the Horizon 21 European Down syndrome consortium. Alzheimers Dement 20, 3270-3280 (2024). [PubMed: 38506627] sourcePartly supported

  The Background (page unavailable) describes DS as a cause of intellectual disability and reports near-universal Alzheimer’s neuropathology by age 40, supporting the combination of developmental and degenerative features. It does not establish that most people demonstrate progressive cognitive impairment by mid-adulthood: neuropathology is not the same as clinical impairment, and the reported mean age of AD diagnosis is 53.8 years. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [78] 78. Iulita MF, Garzón Chavez D, Klitgaard Christensen M, Valle Tamayo N, Plana-Ripoll O, Rasmussen SA, Roqué Figuls M, Alcolea D, Videla L, Barroeta I, Benejam B, Altuna M, Padilla C, Pegueroles J, Fernandez S, Belbin O, Carmona-Iragui M, Blesa R, Lleó A, Bejanin A, Fortea J, Association of Alzheimer Disease With Life Expectancy in People With Down Syndrome. JAMA Network Open 5, e2212910 (2022). [PubMed: 35604690] sourcePartly supported

  The Introduction (page unavailable) identifies Down syndrome as a genetic cause of intellectual disability and reports Alzheimer-related neuropathology by age 40, supporting the developmental and degenerative aspects. The Results (page unavailable) give a pooled mean age of 53.8 years for dementia onset, but do not establish that most individuals have progressive cognitive impairment by mid-adulthood; pathology by 40 is not the same as clinical impairment. (LLM, conf=0.85)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

Microglia play a critical role in activity-dependent synaptic pruning and refinement of neural circuits during key periods of synaptogenesis.

“Microglia play a critical role in activity-dependent synaptic pruning and the refinement of neural circuits during key periods of synaptogenesis (61).”

• cites [61] 61. Paolicelli RC, Bolasco G, Pagani F, Maggi L, Scianni M, Panzanelli P, Giustetto M, Ferreira TA, Guiducci E, Dumas L, Ragozzino D, Gross CT, Synaptic pruning by microglia is necessary for normal brain development. Science 333, 1456-1458 (2011). [PubMed: 21778362] sourcePartly supported

  The Abstract (page unavailable) reports that microglia engulf synaptic material and play a major role in pruning during postnatal development in mice. The conclusion (page unavailable) links deficient pruning to immature brain circuitry. Neither passage establishes that the pruning is activity-dependent; measurements of synaptic activity do not show that neural activity guides pruning. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

Chromosome 21 is one of five human acrocentric chromosomes (13, 14, 15, 21, and 22) that exhibit high sequence conservation and are characterized by an abundance of repetitive elements within their short arms.

“Chromosome 21 is one of five human acrocentric chromosomes (13, 14, 15, 21, and 22) that exhibit high sequence conservation and are characterized by an abundance of repetitive elements within their short arms (99, 100).”

• cites [99] 99. Hinrichs AS, Karolchik D, Baertsch R, Barber GP, Bejerano G, Clawson H, Diekhans M, Furey TS, Harte RA, Hsu F, Hillman-Jackson J, Kuhn RM, Pedersen JS, Pohl A, Raney BJ, Rosenbloom KR, Siepel A, Smith KE, Sugnet CW, Sultan-Qurraie A, Thomas DJ, Trumbower H, Weber RJ, Weirauch M, Zweig AS, Haussler D, Kent WJ, The UCSC Genome Browser Database: update 2006. Nucleic Acids Research 34, D590-D598 (2006). [PubMed: 16381938] sourceCould not verify

  Our copy’s Chromosome ideogram section describes a display feature, and its Conservation section describes multi-species alignment scores; neither addresses acrocentric chromosomes. Searches for chromosomes 13, 14, 15, 21, and 22 and for repetitive elements in their short arms found no passage supporting the claim. The supplied passages have no page numbers. (LLM, conf=0.75)

  Experimental — accuracy not yet measured
• cites [100] 100. Wang Q, Li M, Wu T, Zhan L, Li L, Chen M, Xie W, Xie Z, Hu E, Xu S, Yu G, Exploring Epigenomic Datasets by ChIPseeker. Curr Protoc 2, e585 (2022). [PubMed: 36286622] sourceNot checked — no full text of the source

Classified as probably not a substantial claim.

Accurate chromatin accessibility analysis depends on precise peak calling, because calling peaks across the entire cell population can inadvertently exclude peaks specific to smaller subpopulations.

“Accurate chromatin accessibility analysis depends on precise peak calling, as calling peaks across the entire cell population can inadvertently exclude those specific to smaller subpopulations (85).”

• cites [85] 85. Young MD, Behjati S, SoupX removes ambient RNA contamination from droplet-based single-cell RNA sequencing data. Gigascience 9, giaa151 (2020). [PubMed: 33367645] sourceCould not verify

  The SoupX Method and Discussion describe ambient RNA contamination in single-cell RNA sequencing and the use of gene markers and clustering to estimate it. Searches for chromatin accessibility, peak calling, and subpopulation-specific peaks found no passage addressing the claimed risk of calling peaks across an entire cell population. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

May combine two claims.

Genes are downregulated in CGE InN and MGE InN, with synaptic cellular component ontology enrichment.

“( C and D ) SynGO (30) plot of genes downregulated in CGE InN (C) or MGE InN (D).”

• cites [30] 30. Koopmans F, van Nierop P, Andres-Alonso M, Byrnes A, Cijsouw T, Coba MP, Cornelisse LN, Farrell RJ, Goldschmidt HL, Howrigan DP, Hussain NK, Imig C, de Jong APH, Jung H, Kohansalnodehi M, Kramarz B, Lipstein N, Lovering RC, MacGillavry H, Mariano V, Mi H, Ninov M, Osumi-Sutherland D, Pielot R, Smalla K-H, Tang H, Tashman K, Toonen RFG, Verpelli C, Reig-Viader R, Watanabe K, van Weering J, Achsel T, Ashrafi G, Asi N, Brown TC, De Camilli P, Feuermann M, Foulger RE, Gaudet P, Joglekar A, Kanellopoulos A, Malenka R, Nicoll RA, Pulido C, de Juan-Sanz J, Sheng M, Südhof TC, Tilgner HU, Bagni C, sourceSupported

May combine two claims.

The dysregulation in early postnatal Ts21 dlPFC includes deficits in metabolic and synaptic pathways, oligodendrocyte lineage progression, and a pronounced neuroinflammatory signature.

“Our findings reveal widespread dysregulation of chromatin accessibility and gene expression, with deficits spanning metabolic and synaptic pathways, oligodendrocyte lineage progression, and a pronounced neuroinflammatory signature.”

May combine two claims.

Analysis of Chr21-encoded TF motif enrichment revealed significant enrichment (adj. p < 0.05) near metabolic and translational DEG gene bodies but not near synaptic or immune genes.

“Supporting this, analysis of Chr21-encoded TF motif enrichment revealed significant enrichment (adj. p &lt; 0.05) near metabolic and translational DEG gene bodies but not near synaptic or immune genes (fig. S7B).”

May combine two claims.

The single-nucleus multiomic GRN analysis revealed an attenuation of TF activator activity across the Ts21 oligodendrocyte lineage, particularly affecting cell cycle-related (GLI3, E2F7, BRCA1) and oligodendrocyte lineage-specific (OLIG2, SOX10, TCF7L2, MYRF) regulons, whereas Ts21 TF repressor activity was increased in a cell-type specific manner.

“This analysis revealed an attenuation of TF activator activity across the Ts21 oligodendrocyte lineage, particularly affecting cell cycle-related (GLI3, E2F7, BRCA1) and oligodendrocyte lineage-specific (OLIG2, SOX10, TCF7L2, MYRF) regulons, whereas Ts21 TF repressor activity was increased in a cell-type specific manner (Fig. 5J).”

May combine two claims.

Differential signaling analysis for all ExNs revealed enhanced extracellular matrix-related signaling along with pronounced upregulation of APP signaling in Ts21 ExNs.

“This revealed enhanced extracellular matrix-related signaling along with pronounced upregulation of APP signaling in Ts21 ExNs (fig. S8G).”

May combine two claims.

Downregulated DEGs in Ts21 OPCs were enriched for the regulation of proliferation and differentiation, including cell cycle, cell polarity, and DNA repair processes, highlighting deficits in the regulation and fidelity of mitosis.

“Conversely, downregulated DEGs in Ts21 OPCs were enriched for the regulation of proliferation and differentiation, including cell cycle, cell polarity, and DNA repair processes, highlighting deficits in the regulation and fidelity of mitosis (Fig. 5H).”

May combine two claims.

Most highly variable genes (HVGs) were shared between control and Ts21 (71.8%), but a subset were condition-specific.

“Whereas most HVGs were shared (71.8%), a subset were condition-specific (fig. S3A).”

May combine two claims.

Ts21 ExN populations had preferentially increased accessibility in intergenic and intronic regions, whereas InNs primarily exhibited an increase in DARs at promoters.

“Ts21 ExN populations had preferentially increased accessibility in intergenic and intronic regions, whereas InNs primarily exhibited an increase in DARs at promoters (Fig. 1H, table S4).”

May combine two claims.

The multiomic analysis revealed a global and widespread disruption of gene regulation along with discrete, cell-type-specific perturbations at a critical period of neurodevelopment.

“Our multiomic analysis of Ts21 gene expression and chromatin accessibility revealed a global and widespread disruption of gene regulation along with discrete, cell-type-specific perturbations at a critical period of neurodevelopment.”

May combine two claims.

For L2-3 IT ExN, hdWGCNA identified upregulated modules enriched for metabolic and calcium channel complexes, whereas the most highly downregulated module corresponded to PSD membrane components, including scaffolding proteins critical for receptor clustering and synaptic stability.

“For L2-3 IT ExN, hdWGCNA identified upregulated modules enriched for metabolic and calcium channel complexes, whereas the most highly downregulated module corresponded to PSD membrane components, including scaffolding proteins critical for receptor clustering and synaptic stability (Fig. 3, H and I, fig. S8, B to F).”

May combine two claims.

Glial cells exhibited the most pronounced upregulation of gene expression, whereas vascular and glial populations demonstrated the greatest number of highly downregulated differentially expressed genes (DEGs; adj. P<0.01, FC>2).

“Glial cells exhibited the most pronounced upregulation of gene expression, whereas vascular and glial populations demonstrated the greatest number of highly downregulated differentially expressed genes (DEGs; adj. P&lt;0.01, FC&gt;2) (fig. S4, A and B).”

May combine two claims.

Neuronal classes demonstrated a general pattern of attenuated outgoing and incoming interaction strength, whereas endothelial and vascular leptomeningeal cells (VLMCs) displayed pronounced increases in outgoing interaction strength.

“Neuronal classes demonstrated a general pattern of attenuated outgoing and incoming interaction strength, whereas endothelial and vascular leptomeningeal cells (VLMCs) displayed pronounced increases in outgoing interaction strength (fig. S5C).”

May combine two claims.

DEGs associated with oxidative stress, immune response, and apoptosis were enriched, including increased expression of pro-apoptotic regulators and the executioner caspase CASP3.

“DEGs associated with oxidative stress, immune response, and apoptosis were also enriched, including increased expression of pro-apoptotic regulators and the executioner caspase CASP3 (Fig. 3D).”

May combine two claims.

Regions spanning Chr21q22.13-q22.3 contained markedly increased accessibility and gene expression, whereas genic-sparse regions (Chr21q21.2) demonstrated minimal alterations in accessibility.

“Regions spanning Chr21q22.13-q22.3 contained markedly increased accessibility and gene expression, whereas genic-sparse regions (Chr21q21.2) demonstrated minimal alterations in accessibility (Fig. 2D and fig. S6).”

May combine two claims.

Ts21-upregulated gene modules in MGE (Module 1) and CGE (Module 2) neurons exhibited enrichment for metabolic and protein translation processes, whereas Ts21-downregulated modules in MGE (Module 4) and CGE (Module 8) neurons were associated with PSD components, including AMPA receptor complexes and calcium channel signaling.

“Ts21-upregulated gene modules in MGE (Module 1) and CGE (Module 2) neurons exhibited enrichment for metabolic and protein translation processes, whereas Ts21-downregulated modules in MGE (Module 4) and CGE (Module 8) neurons were associated with PSD components, including AMPA receptor complexes and calcium channel signaling (fig. S10, B to K).”

May combine two claims.

The results demonstrate that whereas the generation, developmental patterning, and migration of InNs to the postnatal dlPFC are conserved in Ts21, widespread molecular dysregulation occurs during postnatal maturation with synaptic and metabolic impairments during interneuron circuit integration.

“These results demonstrate that whereas the generation, developmental patterning, and migration of InNs to the postnatal dlPFC are conserved in Ts21, widespread molecular dysregulation occurs during postnatal maturation with synaptic and metabolic impairments during interneuron circuit integration.”

May combine two claims.

Significantly increased pseudotime values (p < 0.0001) were found in Ts21 OPCs and Oligos, with OPCs displaying the most pronounced differences.

“This uncovered significantly increased pseudotime values (p &lt; 0.0001) in Ts21 OPCs and Oligos - with OPCs displaying the most pronounced differences - indicative of impairments in proliferation and differentiation (Fig. 5E).”

May combine two claims.

These synaptic deficits were conserved across IT subtypes, although cell-type-specific expression patterns suggest heterogeneous manifestations of a widespread synaptic pathology.

“These synaptic deficits were conserved across IT subtypes, although cell-type-specific expression patterns suggest heterogeneous manifestations of a widespread synaptic pathology (Fig. 3G).”

May combine two claims.

These transcriptional deficits were most pronounced in mature oligodendrocytes relative to newly formed (nfOligos), indicating disrupted maturation from newly formed to myelinating cells.

“These transcriptional deficits were most pronounced in mature oligodendrocytes relative to newly formed (nfOligos), indicating disrupted maturation from newly formed to myelinating cells (Fig. 5, K to M, and fig. S12, C to I).”

May combine two claims.

The results demonstrate a selective expansion of upper-layer IT ExNs in the early postnatal Ts21 dlPFC, concurrent with subtype-specific reorganization of glial and inhibitory neuronal populations.

“Together, our results demonstrate a selective expansion of upper-layer IT ExNs in the early postnatal Ts21 dlPFC, concurrent with subtype-specific reorganization of glial and inhibitory neuronal populations.”

May combine two claims.

Increased expression of APP was found across ExNs, and an enhanced APP network for all major cell types.

“We found an increased expression of APP across ExNs, and an enhanced APP network for all major cell types (fig. S8, H to J).”

May combine two claims.

All Ts21 ExNs exhibited greater transcriptomic heterogeneity, whereas InNs displayed subclass-specific differences.

“We found that all Ts21 ExNs exhibited greater transcriptomic heterogeneity, whereas InNs displayed subclass-specific differences (fig. S3D).”

May combine two claims.

Chr21 displayed the most pronounced elevation in both chromatin accessibility and highly upregulated DEGs.

“As expected, Chr21 displayed the most pronounced elevation in both chromatin accessibility and highly upregulated DEGs.”

May combine two claims.

Motifs for BACH1 were significantly enriched (adj. p < 0.01) in accessible chromatin of ExN, microglia, and oligodendrocyte lineage cells, with TF footprinting confirming elevated BACH1 activity in these populations.

“Motifs for BACH1 - a TF associated with impaired Ts21 antioxidant defenses (28) - were significantly enriched (adj. p &lt; 0.01) in accessible chromatin of ExN, microglia, and oligodendrocyte lineage cells (Fig. 2G), with TF footprinting confirming elevated BACH1 activity in these populations (Fig. 2H).”

• cites [28] 28. Perluigi M, Tramutola A, Pagnotta S, Barone E, Butterfield DA, The BACH1/Nrf2 Axis in Brain in Down Syndrome and Transition to Alzheimer Disease-Like Neuropathology and Dementia. Antioxidants (Basel) 9, 779 (2020). [PubMed: 32839417]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

May combine two claims.

Chr21 DEGs exhibited, on average, a ~1.5-fold increased expression with significantly higher expression (p < 0.001) compared to non-Chr21 DEGs.

“Consistent with well-established gene dosage effects, we found that Chr21 DEGs exhibited, on average, a ~1.5-fold increased expression with significantly higher expression (p &lt; 0.001) compared to non-Chr21 DEGs (Fig. 2A).”

May combine two claims.

The most highly downregulated Ts21 signaling pathways involved synaptic adhesion molecules, with many components of the neurexin, neuroligin, and neuregulin families downregulated in L2-3 IT neurons.

“Additionally, the most highly downregulated Ts21 signaling pathways involved synaptic adhesion molecules, with many components of the neurexin, neuroligin, and neuregulin families downregulated in L2-3 IT neurons (fig. S8K, fig. S9).”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Peak sets showed marked enrichment for active enhancer and promoter states and underrepresentation of heterochromatin.

“Notably, there was marked enrichment for active enhancer and promoter states across all peak sets, while regions annotated as heterochromatin were underrepresented among identified peaks.”

May combine two claims.

There is broad upregulation of stress-responsive HSPs in Ts21 astrocytes, with both Ts21-specific and reactivity-associated enrichment.

“We identified a broad upregulation of stress-responsive HSPs, of which we found both Ts21specific and reactivity-associated enrichment (Fig. 6, O and P).”

May combine two claims.

Classification of microglial states revealed a shift in Ts21 microglia toward an activated phenotype, with all analyzed cells exhibiting molecular features of activation.

“Classification of microglial states based on these markers revealed a shift in Ts21 microglia toward an activated phenotype, with all analyzed cells exhibiting molecular features of activation (Fig. 7, D and E, and fig. S15, B to E).”

May combine two claims.

Ts21 microglia displayed marked activation in the early postnatal period, with increased expression of inflammatory markers, complement cascade components, and MHC class I/II receptors, as well as subtype-specific enrichment for phagocytic and antigen presentation pathways.

“Furthermore, Ts21 microglia displayed marked activation in the early postnatal period, with increased expression of inflammatory markers, complement cascade components, and MHC class I/II receptors, as well as subtype-specific enrichment for phagocytic and antigen presentation pathways.”

May combine two claims.

We identified molecular correlates of intrinsic pan-neuronal synaptic deficits, oligodendrocyte lineage progression and functional myelination defects, impaired neuron-glia adhesion, and activated antigen-presenting microglia during a critical period of synaptogenesis.

“We identified molecular correlates of intrinsic pan-neuronal synaptic deficits, oligodendrocyte lineage progression and functional myelination defects, impaired neuron-glia adhesion, and activated antigen-presenting microglia during a critical period of synaptogenesis.”

May combine two claims.

Microglial subclustering identified two predominant subtypes: Micro CD200 PRKAA2 and Micro CTSC DOCK1, present in both control and Ts21.

“Subsequent microglial subclustering identified two predominant subtypes: Micro CD200 PRKAA2 and Micro CTSC DOCK1 present in both control and Ts21 (fig. S17, E to I).”

May combine two claims.

Ts21 astrocytes show pronounced activation of AP-1 family members, except ATF7, which exhibits reduced activity.

“This revealed a marked increase in the activity of canonical transcription factors governing reactivity (STAT3, ETS2, NKFB1) and pronounced activation of AP-1 family members in Ts21 astrocytes, except for ATF7, which exhibited reduced activity (Fig. 6N).”

May combine two claims.

Ts21 Micro CTSC DOCK1 displays increased expression of complement receptors critical for phagocytosis, including CR3 (ITGAM/ITGB2), CR5 (ITGAX/ITGB2), and C3aR (C3AR1), along with MHC class II components essential for antigen presentation.

“Ts21 Micro CTSC DOCK1 displayed increased expression of complement receptors critical for phagocytosis, including CR3 (ITGAM/ITGB2), CR5 (ITGAX/ITGB2), and C3aR (C3AR1), along with MHC class II components essential for antigen presentation (Fig. 7, N to P).”

May combine two claims.

VLMCs exhibit the highest number of upregulated interferon response genes, many of which are cell-type-specific.

“VLMCs exhibited the highest number of upregulated interferon response genes, many of which were cell-type-specific, highlighting meningeal cells as a critical node for Ts21 inflammatory signaling (fig. S16D).”

Probably not a substantial claim: may not pass S3 (load-bearing).

Cell subclasses present only in control exist.

“Cell subclasses present only in control are highlighted in red.”

May combine two claims.

Chr21-encoded transcription factor (TF) motif enrichment varies by cell subclass and JASPAR motif, with motif fold enrichment in Ts21 and statistical significance (adjusted p-value, hypergeometric test).

“( G) Dot plot of Chr21-encoded transcription factor (TF) motif enrichment plotted by cell subclass (x-axis) and JASPAR motif (y-axis). Dot size represents motif fold enrichment in Ts21, and dot color represents statistical significance (adjusted p-value, hypergeometric test).”

May combine two claims.

In Ts21 dlPFC, an AIF1+/HLA-DRB1+ microglial cell is present, while control shows AIF1+/HLA-DRB1- microglia and an AIF1-/HLA-DRB1+ intravascular immune cell.

“The Ts21 panel highlights an AIF1+/HLA-DRB1+ microglial cell (white arrow), while the control panel shows AIF1+/HLA-DRB1- microglia (white arrows) and an AIF1-/HLADRB1+ intravascular immune cell (black arrow).”

The quote only partly states this claim.

The proportion of homeostatic and reactive astrocytes differs between control and Ts21.

“( E ) Proportion of control (left) and Ts21 (right) homeostatic and reactive astrocytes.”

May combine two claims.

P53 pathway, Apoptosis, and Hypoxia Hallmark gene sets are significantly enriched in control reactive astrocytes.

“( G to I ) Astrocyte gene expression dot plots of select genes from Hallmark gene sets, (P53 pathway (G), Apoptosis (H), Hypoxia (I)) significantly enriched in control reactive astrocytes”

Probably not a substantial claim: may not pass S3 (load-bearing).

TF footprinting analysis shows positional distribution of Tn5 insertions within ±250 bp of TF motif of all BACH1 motif sites in peaks in select cell subclasses for control and Ts21.

“( H ) TF footprinting analysis depicting the positional distribution of Tn5 insertions within ±250 bp of TF motif of all BACH1 motif sites in peaks in select cell subclasses for control (green) and Ts21 (purple).”

The quote only partly states this claim.

The proportion of activated and homeostatic microglia differs between control and Ts21.

“( E ) Proportion of control (left) and Ts21 (right) activated and homeostatic microglia.”

May combine two claims.

These findings implicate cell-type specific regulatory mechanisms, with Ts21-associated suppression of synaptic adhesion gene networks in neurons contrasting with amplified vascular-associated paracrine signaling.

“These findings implicate cell-type specific regulatory mechanisms, with Ts21-associated suppression of synaptic adhesion gene networks in neurons contrasting with amplified vascular-associated paracrine signaling.”

May combine two claims.

These changes reflect likely Ts21-associated perturbations in developmental patterning, cell maturation, or subtype-specific pathological responses.

“These changes reflect likely Ts21-associated perturbations in developmental patterning, cell maturation, or subtype-specific pathological responses.”

May combine two claims.

The study reveals convergent pathways of neurodevelopmental disruption and hallmarks of incipient neurodegeneration in the early postnatal Ts21 dlPFC.

“We reveal convergent pathways of neurodevelopmental disruption and hallmarks of incipient neurodegeneration in the early postnatal Ts21 dlPFC.”

Probably not a substantial claim: may not pass S3 (load-bearing).

After stringent quality control, a total of 220,956 nuclei were retained for analysis.

“After implementing stringent quality control (Methods) , a total of 220,956 nuclei were retained for analysis (Fig. 1C and fig. S1, A to J).”

May combine two claims.

The predominance of promoter-associated DARs suggests broad dysregulation of transcriptional activation, whereas distal accessibility changes reflect putative disrupted enhancer-promoter interactions.

“The predominance of promoter-associated DARs suggests broad dysregulation of transcriptional activation, whereas distal accessibility changes reflect putative disrupted enhancer-promoter interactions.”

May combine two claims.

This demonstrates the nonuniformity of accessibility and gene expression within Chr21, underscoring both localized dosage effects and broader trans-acting regulatory disruptions in Ts21.

“This demonstrates the nonuniformity of accessibility and gene expression within Chr21, underscoring both localized dosage effects and broader trans-acting regulatory disruptions in Ts21.”

Classified as probably not a substantial claim.

After stringent quality control, snATAC-seq data from 124,105 nuclei were retained for downstream analyses.

“After implementing stringent quality control (Methods) , snATAC-seq data from 124,105 nuclei were retained for downstream analyses (fig. S1, E to H, table S1).”

May combine two claims.

These findings suggest inter-chromosomal regulatory interactions or shared mechanisms of epigenetic dysregulation at the chromosomal scale.

“These findings are of particular importance given the altered nuclear architecture in trisomic cells, suggesting inter-chromosomal regulatory interactions or shared mechanisms of epigenetic dysregulation at the chromosomal scale.”

May combine two claims.

These results reveal shared molecular perturbations across inhibitory and excitatory neuron subclasses, uncovering a pan-neuronal signature of metabolic and synaptic gene dysregulation.

“These results reveal shared molecular perturbations across inhibitory and excitatory neuron subclasses, uncovering a pan-neuronal signature of metabolic and synaptic gene dysregulation.”

May combine two claims.

Aberrant glial and ExN populations clustered more closely with microglia subclasses, suggesting activation of inflammatory/immune-related transcriptional programs.

“Aberrant glial and ExN populations clustered more closely with microglia subclasses, suggesting activation of inflammatory/immune-related transcriptional programs.”

May combine two claims.

Chr21 TF-mediated dysregulation predominantly affects metabolic and proteostatic pathways in Ts21, whereas immune and synaptic gene perturbations reflect downstream pathological processes.

“These findings suggest that Chr21 TF-mediated dysregulation predominantly affects metabolic and proteostatic pathways in Ts21, whereas immune and synaptic gene perturbations reflect downstream pathological processes.”

May combine two claims.

The more pronounced increase in L2-3 IT neuron composition during the early postnatal period, together with elevated expression of proapoptotic factors, suggests prenatal overproduction of upper-layer IT neurons followed by apoptotic elimination during later postnatal maturation.

“However, the more pronounced increase in L2-3 IT neuron composition we observed during the early postnatal period, together with elevated expression of proapoptotic factors, suggests prenatal overproduction of upper-layer IT neurons followed by apoptotic elimination during later postnatal maturation.”

May combine two claims.

Astrocyte reactivity in control samples is likely related to postmortem interval, with enrichment for hypoxia-dependent gene expression and activation of the TP53-dependent apoptotic pathway.

“We identified enrichment of TP53 and executioner caspase CASP7 expression specifically in control reactive astrocytes, suggesting that astrocyte reactivity in control samples is likely related to postmortem interval, with enrichment for hypoxia-dependent gene expression and activation of the TP53-dependent apoptotic pathway (Fig. 6, G to I).”

Classified as probably not a substantial claim.

To quantify HLA-DRB1+/AIF1+ microglia, images from five independent regions of grey matter and five independent regions of white matter were acquired from each tissue section, with n=3 sections per condition.

“To quantify the number of HLA-DRB1+/AIF1+ microglia, images from five independent regions of the grey matter and five independent regions of the white matter were acquired from each tissue section (n=3 sections per condition) using a Nikon A1 confocal microscope.”

May combine two claims.

Interferon-responsive microglia have been shown to be highly phagocytic and actively shape cortical development.

“This is especially relevant given interferon-responsive microglia have been shown to be highly phagocytic and actively shape cortical development (76), suggesting that interferon-induced microglia pathologically and excessively prune synapses critical for physiological circuit maturation in the Ts21 dlPFC.”

• cites [76] 76. Escoubas CC, Dorman LC, Nguyen PT, Lagares-Linares C, Nakajo H, Anderson SR, Barron JJ, Wade SD, Cuevas B, Vainchtein ID, Silva NJ, Guajardo R, Xiao Y, Lidsky PV, Wang EY, Rivera BM, Taloma SE, Kim DK, Kaminskaya E, Nakao-Inoue H, Schwer B, Arnold TD, Molofsky AB, Condello C, Andino R, Nowakowski TJ, Molofsky AV, Type-I-interferon-responsive microglia shape cortical development and behavior. Cell 187, 1936-1954.e24 (2024). [PubMed: 38490196] sourceNot checked — no full text of the source

The quote only partly states this claim.

The enrichment for active enhancer and promoter states and underrepresentation of heterochromatin support the validity of the genomic regions identified in the peak analysis.

“These results serve as a quality control measure, supporting the validity of the genomic regions identified in the peak analysis.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Both genotypes underwent the same QC pipeline, with genotype-specific upper thresholds for UMI counts.

“Notably, both genotypes underwent the same QC pipeline, with the caveat of genotype-specific upper thresholds for UMI counts.”

Classified as probably not a substantial claim. May combine two claims.

Complement components are critical for synaptic tagging and engulfment.

“Ts21 microglia exhibited pronounced upregulation of complement components - critical for synaptic tagging and engulfment (67) - alongside elevated expression of MHC class I/II receptors (Fig. 7, I to L).”

• cites [67] 67. Stevens B, Allen NJ, Vazquez LE, Howell GR, Christopherson KS, Nouri N, Micheva KD, Mehalow AK, Huberman AD, Stafford B, Sher A, Litke AM, Lambris JD, Smith SJ, John SWM, Barres BA, The classical complement cascade mediates CNS synapse elimination. Cell 131, 11641178 (2007). [PubMed: 18083105] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

A substantial part of chromosome 21 is masked in the hg38 assembly, as visible in the chromosome-wide visualization.

“A substantial part of chr21 is consequently masked in the hg38 assembly, notable in the chromosome-wide visualization (Fig. 2D and fig. S6A).”

May combine two claims.

We identified inflammatory mediators that drive this activation and further potentiate interferon receptor expression through regulation of the pro-inflammatory interferon receptor IFNGR2.

“We identified inflammatory mediators that drive this activation and further potentiate interferon receptor expression through regulation of the pro-inflammatory interferon receptor IFNGR2.”

May combine two claims.

This astrocyte reactivity is driven in part by activation of the key transcription factor AP-1 complex and is accompanied by suppression of homeostatic gene expression and upregulation of cell-survival gene expression programs.

“We identified that this reactivity is driven in part by the activation of the key transcription factor AP-1 complex and is accompanied by the suppression of homeostatic gene expression and upregulation of cell-survival gene expression programs.”

May combine two claims.

Both control and Ts21 cells were enriched for microglia-specific markers and lacked molecular features of non-resident immune cells.

“Both control and Ts21 cells were enriched for microglia-specific markers and lacked molecular features of non-resident immune cells (fig. S15A).”

Classified as probably not a substantial claim.

An adaptive thresholding approach tailored to each genotype was implemented to ensure equitable retention of high-quality nuclei across Ts21 and control samples.

“To address this, we implemented an adaptive thresholding approach tailored to each genotype to ensure equitable retention of high-quality nuclei across Ts21 and control samples.”

May combine two claims.

AP-1 and stress response components are central regulators of astrocyte pathology and have potential as therapeutic targets for modulating astrocyte dysfunction in DS and related neurodegenerative disorders.

“The identification of AP-1 and stress response components as central regulators of astrocyte pathology highlights their potential as therapeutic targets for modulating astrocyte dysfunction in DS and related neurodegenerative disorders.”

Classified as probably not a substantial claim.

All Ts21 and control samples were treated identically in the alignment and processing of snMultiome data.

“All Ts21 and control samples were treated identically in this portion of the analysis.”

Classified as probably not a substantial claim. May combine two claims.

HLA-DRB1 integrated density was measured and cell total corrected fluorescence (CTCF) was calculated after background subtraction.

“The HLA-DRB1 integrated density (sum of all pixel intensities) of each microglia ROI along with one background ROI was recorded and the cell total corrected fluorescence (CTCF) was calculated after background subtraction (CTCF = integrated density of signal - [area of signal ROI * mean intensity of background ROI]).”

May combine two claims.

The concurrence of neurodevelopmental deficits and neurodegenerative signatures supports a model in which these processes are mechanistically interconnected, potentially compounding cognitive and functional impairment from the earliest stages of life in DS.

“The concurrence of neurodevelopmental deficits and neurodegenerative signatures supports a model in which these processes are mechanistically interconnected, potentially compounding cognitive and functional impairment from the earliest stages of life in DS.”

• AssumptionRests on an assumption: The early postnatal period is a critical window for synaptogenesis and complement-dependent synaptic pruning.

Probably not a substantial claim: may not pass S3 (load-bearing).

A subsequent Bradford assay confirmed uniform protein concentrations across all samples following dilution.

“A subsequent Bradford assay was performed to confirm uniform protein concentrations across all samples following dilution.”

May combine two claims.

This study presents a comprehensive single-nucleus multiomic analysis of the early postnatal dlPFC in Down syndrome, revealing a complex landscape of molecular and cellular dysregulation that underpins both neurodevelopmental and neurodegenerative features of this disorder.

“This study presents a comprehensive single-nucleus multiomic analysis of the early postnatal dlPFC in Down syndrome, revealing a complex landscape of molecular and cellular dysregulation that underpins both the neurodevelopmental and the neurodegenerative features of this disorder.”

Probably not a substantial claim: may not pass S3 (load-bearing).

In the chromosome-wide view, chromosome 21 presents distinct genome sequence biology on the short arm compared to the rest of the chromosome.

“In this view, chr21 presents distinct genome sequence biology on the short arm compared to the rest of the chromosome.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

All samples and standards were analyzed in duplicate, and mean values were used for subsequent analyses.

“All samples and standards were analyzed in duplicate, and mean values were used for subsequent analyses.”

Probably not a substantial claim: may not pass S3 (load-bearing).

No-template and no-reverse transcription (no-RT) controls were included for each reverse transcription run.

“No-template and no-reverse transcription (no-RT) controls were included for each reverse transcription run.”

Probably not a substantial claim: may not pass S3 (load-bearing).

Analytes with measured concentrations below the lowest detectable standard were excluded from downstream analyses.

“Analytes with measured concentrations below the lowest detectable standard were excluded from downstream analyses.”

May combine two claims.

The regulation of IFNGR2 by RUNX1 and NFKB1 suggests a Chr21-driven positive feedback loop wherein RUNX1 enhances IFNGR2 expression, thereby exacerbating interferon signaling and inflammation.

“Network analysis further revealed key interactions associated with inflammation, including regulation of the Chr21-encoded interferon receptor IFNGR2 by both RUNX1 and NFKB1, suggesting a Chr21-driven positive feedback loop wherein RUNX1 enhances IFNGR2 expression, thereby exacerbating interferon signaling and inflammation (fig. S16A).”

May combine two claims.

Neuroimmune dysfunction plays a role in disrupted synaptic refinement during Ts21 early brain development, and key pathways and cell subtypes are identified for potential therapeutic intervention.

“These findings underscore the role of neuroimmune dysfunction in disrupted synaptic refinement during Ts21 early brain development and identify key pathways and cell subtypes for potential therapeutic intervention.”

May combine two claims.

Glial and immune state alterations are amplified by dysregulated cytokine signaling and enhanced vascular-immune-glial crosstalk, establishing a multicellular feedforward inflammatory axis in the Ts21 brain.

“We further identified glial and immune state alterations to be amplified by dysregulated cytokine signaling and enhanced vascularimmune-glial crosstalk, establishing a multicellular feedforward inflammatory axis in the Ts21 brain.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims. The quote only partly states this claim.

This study was performed in accordance with ethical and legal guidelines of University of Wisconsin-Madison IRB and NIH/WMA Declaration of Helsinki.

“This study was performed in accordance with the ethical and legal guidelines of the University of Wisconsin-Madison Institutional Review Board.”

May combine two claims.

Decreased PPARG repressor regulon activity indicates diminished suppression of inflammatory gene expression alongside activation of pro-inflammatory pathways.

“We identified decreased activity of the PPARG repressor regulon, indicating diminished suppression of inflammatory gene expression alongside the activation of pro-inflammatory pathways (fig. S14).”

Probably not a substantial claim: may not pass S3 (load-bearing).

Harmony was applied to correct for batch effects.

“To correct for batch effects, we applied Harmony v1.2.3 (14) within Seurat.”

Probably not a substantial claim: may not pass S3 (load-bearing).

Assay quality was evaluated based on intra-assay coefficients of variation (CV) and adherence of standard values to expected ranges.

“Assay quality was evaluated based on intra-assay coefficients of variation (CV) and adherence of standard values to expected ranges.”

May combine two claims.

The general asymmetry of DARs was recapitulated across several DAR-calling methods, with overall statistics comparable (Poisson) or greater (Wilcoxon) than logistic regression.

“The general asymmetry of DARs was well recapitulated in the results of these methods and the overall statistics of DARs were found comparable (Poisson) or greater (Wilcoxon) than those from logistic regression analysis (fig. S4, E to G).”

Probably not a substantial claim: may not pass S2 (checkable). May combine two claims.

These findings underscore the necessity for early biomarker development, therapeutic innovation, and clinical trials targeting disease modification within this critical developmental window.

“These findings shift the temporal onset of DS-associated neurodegenerative processes to the early postnatal period and underscore the necessity for early biomarker development, therapeutic innovation, and clinical trials targeting disease modification within this critical developmental window.”

• AssumptionRests on an assumption: The early postnatal period is a critical window for synaptogenesis and complement-dependent synaptic pruning.

May combine two claims. The quote only partly states this claim.

Repeating the DA peak analysis using the earliest sample pair showed comparable asymmetry in DARs and recapitulated trends across all three statistical methods, supporting robustness and generalizability of the primary findings.

“This analysis demonstrated a comparable asymmetry in DARs and recapitulated the trends observed across all three statistical methods, thereby supporting the robustness and generalizability of the primary findings (fig. S4J).”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Standard curves were generated for each analyte using the provided standard mixes, and sample concentrations were interpolated using a five-parameter logistic (5-PL) curve fit.

“Standard curves were generated for each analyte using the provided standard mixes (A, B, and F), and sample concentrations were interpolated using a five-parameter logistic (5-PL) curve fit within the ThermoFisher ProcartaPlex Analysis App.”

• AssumptionRests on an assumption: The five-parameter logistic curve fit accurately interpolates sample concentrations.

Probably not a substantial claim: may not pass S3 (load-bearing).

Doublet removal used an ensemble approach, classifying a nucleus as a doublet if flagged by at least two of three methods.

“We incorporated three tools: DoubletFinder v2.0.4 (81), Scrublet v0.2.3 (82), and scDBIFinder v1.18.0 (83) and classified a nucleus as a doublet if it was flagged by at least two of the three methods.”

Classified as probably not a substantial claim.

Target protein intensity was normalized to total protein intensity.

“Target protein intensity was normalized to total protein intensity and statistical significance of agematched Ts21 and control samples was tested using a two-tailed unpaired t-test (GraphPad Prism).”

• AssumptionRests on an assumption: Total protein staining accurately reflects protein loading and is not differentially affected between Ts21 and control samples.

Probably not a substantial claim: may not pass S3 (load-bearing).

Protein concentrations were quantified using the colorimetric DC protein assay with a standard curve for calibration.

“Protein concentrations were quantified using the colorimetric DC protein assay (Bio-Rad #5000112) according to the manufacturer's instructions, with a standard curve for calibration.”

May combine two claims.

Key regulators of microglial inflammation and interferon activation include Chr21-encoded factors such as RUNX1 and IFNGR2 and broader non-cell-autonomous inflammatory signaling as central drivers of Ts21 neuroinflammation.

“Together, these findings identify key regulators of microglial inflammation and interferon activation, highlighting both Chr21-encoded factors, such as RUNX1 and IFNGR2, and broader non-cell-autonomous inflammatory signaling as central drivers of Ts21 neuroinflammation.”

Classified as probably not a substantial claim.

Target gene concentrations were normalized to the housekeeping gene ACTR3.

“Target gene concentrations were normalized to the housekeeping gene (ACTR3) and statistical significance of age-matched Ts21 and control samples was tested using a two-tailed unpaired t-test (GraphPad Prism).”

• AssumptionRests on an assumption: ACTR3 is a stable housekeeping gene whose expression does not differ systematically between Ts21 and control samples.

May combine two claims.

The AP-1 complex has emerged as a potential therapeutic target bridging interferon signaling and downstream cellular pathology in Ts21 and represents a potential target for modulation of astrocytes in Down syndrome.

“The AP-1 complex has emerged as a potential therapeutic target bridging interferon signaling and downstream cellular pathology in Ts21 and represents a potential target for the modulation of astrocytes in Down syndrome (25).”

May combine two claims.

The shared patterns of differential accessibility highlight a pervasive epigenetic reorganization that extends beyond classical gene dosage effects and implicates both local and trans-acting regulatory mechanisms in molecular pathogenesis.

“We uncovered shared patterns of differential accessibility, highlighting a pervasive epigenetic reorganization that extends beyond classical 'gene dosage effects' and implicates both local and trans-acting regulatory mechanisms in molecular pathogenesis.”

May combine two claims.

These findings establish a molecular framework for the circuit-level dysfunction observed in Down syndrome and highlight the vulnerability of neurite outgrowth, synaptic formation, and functional maturation during early postnatal brain development.

“These findings establish a molecular framework for the circuit-level dysfunction observed in Down syndrome and highlight the vulnerability of neurite outgrowth, synaptic formation, and functional maturation during early postnatal brain development.”

• AssumptionRests on an assumption: The early postnatal period is a critical window for synaptogenesis and complement-dependent synaptic pruning.

May combine two claims.

These results demonstrate unique molecular signatures of Ts21 activated microglial subtypes, highlighting key functional differences in complement-mediated phagocytic activity and antigen presentation.

“Together, these results demonstrate unique molecular signatures of Ts21 activated microglial subtypes, highlighting key functional differences in complement-mediated phagocytic activity and antigen presentation.”

May combine two claims.

Ts21 microglia show dysregulated neuroimmune crosstalk and subtype-specific molecular features.

“Fig. 7. Dysregulated neuroimmune crosstalk and subtype-specific molecular features of Ts21 microglia”