Projections and interconnections of genetically defined serotonin neurons in mice
Open accessAbstract
Brain serotonin neurons are heterogeneous and can be distinguished by several anatomical and physiological characteristics. Toward resolving this heterogeneity into classes of functional relevance, subtypes of mature serotonin neurons were previously identified based on gene expression differences initiated during development in different rhombomeric (r) segments of the hindbrain. This redefinition of mature serotonin neuron subtypes based on the criteria of genetic lineage, along with the enabling genetic fate mapping tools, now allows various functional properties, such as axonal projections, to be allocated onto these identified subtypes. Furthermore, our approach uniquely enables interconnections between the different serotonin neuron subtypes to be determined; this is especially relevant because serotonin neuron activity is regulated by several feedback mechanisms. We used intersectional and subtractive genetic fate mapping tools to generate three independent lines of mice in which serotonin neurons arising in different rhombomeric segments, either r1, r2 or both r3 and r5, were uniquely distinguished from all other serotonin neurons by their expression of enhanced green fluorescent protein. Each of these subgroups of serotonergic neurons had a unique combination of forebrain projection targets. Typically more than one subgroup innervated an individual target area. Unique patterns of interconnections between the different groups of serotonin neurons were also observed and these pathways could subserve feedback regulatory circuits. Overall, the current findings suggest that activation of subsets of serotonin neurons could result in topographic serotonin release in the forebrain coupled with feedback inhibition of serotonin neurons with alternative projection targets.
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Serotonergic projections from the dorsal and medial Raphe nuclei are among the first to emerge and arrive in the PFC around E16/E17 in rodents and postnatal weeks 10-13 in humans.
“The brain matures from the brainstem to the more frontal cortical regions, and it is therefore not surprising that serotonergic projections from both the dorsal as well as the medial Raphe nuclei (DRN, MRN respectively) are among the first to emerge and are set towards cortical regions where they arrive in the PFC around E16/E17 in rodent and week postnatal 10–13 in humans [113–116].”
From Development of prefrontal cortex (2022) · cites this paper as [116]
The Results (‘Major efferent projections’; page unavailable) report cortical innervation by r1-Pet1 neurons, predominantly originating in the dorsal raphe, and medial prefrontal innervation by r2-Pet1 neurons. The paper studies projections in mice but does not establish that these projections are among the first to emerge or give the claimed E16/E17 rodent and postnatal-week-10–13 human arrival times. (LLM, conf=0.88)
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- Authors
- Bang, S. J., Jensen, P., Dymecki, S. M., & Commons, K. G.
- Affiliations
- Boston Children's Hospital (US)
- National Institutes of Health (US)
- Harvard University (US)
- Corresponding author
- Commons, Kathryn G.
- Venue
- European Journal of Neuroscience
- Publisher
- Wiley
- Published
- 2011-12-13
- Volume
- 35
- Issue
- 1
- Pages
- 85-96
- ISSN
- 0953-816X (ISSN-L)
- 1460-9568
- PMC
- PMC3268345
- OpenAlex
- W1929691281
- Cited by
- 181
- References
- 36
- Citations by year
- 2026: 4 · 2025: 7 · 2024: 9 · 2023: 10 · 2022: 15 · 2021: 12 · 2020: 19 · 2019: 17 · 2018: 15 · 2017: 12 · 2016: 7 · 2015: 20 · 2014: 14 · 2013: 12 · 2012: 8
- FWCI
- 4.50
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- European Journal of Neuroscience (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institutes of Health
- National Institute on Drug Abuse (R21DA023643, R01DA021801)
- National Institute of Environmental Health Sciences
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (P01HD036379)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
- Keywords
- serotonergic neurons, hindbrain development, genetic fate mapping, axonal projections, forebrain projections, product inhibition
- MeSH terms
- Animals, Brain, Mice, Transgenic, Neural Pathways, Gene Expression Regulation, Developmental, Green Fluorescent Proteins, Mice, Serotonergic Neurons
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