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Multimodal Hox5 activity generates motor neuron diversity [RNA-seq]

GSE273364 Mus musculus Expression profiling by high throughput sequencing 6 samples Submitted 2024/08/12 Platform GPL17021
Summary
Motor neurons (MNs) are the final output of circuits driving fundamental behaviors, such as respiration and locomotion. Hox proteins are essential in generating the MN diversity required for accomplishing these functions, but the transcriptional mechanisms that enable Hox paralogs to assign distinct MN subtype identities despite their promiscuous DNA binding motif are not well understood. Here we show that Hoxa5 can modify chromatin accessibility in all mouse spinal cervical MN subtypes and engages TALE co-factors to directly bind and regulate subtype-specific genes. We identify a paralog-specific interaction of Hoxa5 with the phrenic MN-specific transcription factor Scip and show that heterologous expression of Hoxa5 and Scip is sufficient to suppress limb-innervating MN identity. We also demonstrate that phrenic MN identity is stable after Hoxa5 downregulation and identify Klf proteins as potential regulators of phrenic MN maintenance. Our data identify multiple modes of Hoxa5 action that converge to induce and maintain MN identity.
Published in
Multimodal Hox5 activity generates motor neuron diversity
Kc R, López de Boer R, Lin M et al. · Communications biology 2024 · PMID 39289460 · doi:10.1038/s42003-024-06835-w
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Also filed as BioProject PRJNA1141490 and SRA study SRP523000. Searching any of these in the dataset finder brings you back here.

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