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Distinct transcriptional programs define cranial motor neuron subtypes during vertebrate development
Biorxiv : the Preprint Server for Biology
|August 1, 2026
Summary
Cranial motor neurons (cMNs) develop distinct identities early, preceding axon targeting. Zebrafish and mouse studies reveal conserved genetic programs shaping cMN development and function.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Cranial motor neurons (cMNs) control vital behaviors like eye movement and facial expression.
- Understanding cMN development, target choice, and functional specialization is crucial but incompletely understood in vertebrates.
Purpose of the Study:
- To create a comprehensive single-cell RNA-sequencing atlas of zebrafish cMN development.
- To identify transcriptional signatures defining cMN nuclei and functional subtypes.
- To investigate the timing of cMN identity specification relative to axon targeting.
Main Methods:
- Single-cell RNA-sequencing of zebrafish cMNs during development.
- HCR in situ hybridization for validation.
- Cross-species comparison with mouse cMN development.
Main Results:
- Each cranial motor nucleus exhibits a unique transcriptional signature.
- Transcriptional correlates for functional subtypes were identified within nuclei.
- cMN identity is genetically specified early, often before axon targeting.
- Conserved genetic programs for cMN development were observed between zebrafish and mouse.
Conclusions:
- Zebrafish cMN development is governed by distinct transcriptional programs influenced by function, origin, and time.
- Genetic specification of cMN identity occurs early in development.
- Key genetic programs for cMN development are conserved across vertebrates.
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