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Runx1 Controls Auditory Sensory Neuron Diversity (CKO)

ABSTRACT: Runx1 Controls Auditory Sensory Neuron Diversity (CKO)

PROVIDER: PRJNA864783 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR20730570.fastq.gz	Fastqsanger.gz
	SRR20730571.fastq.gz	Fastqsanger.gz
	SRR20730572.fastq.gz	Fastqsanger.gz
	SRR20730573.fastq.gz	Fastqsanger.gz
	SRR20730574.fastq.gz	Fastqsanger.gz

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Runx1 Controls Auditory Sensory Neuron Diversity (iCKO)

Project description:Runx1 Controls Auditory Sensory Neuron Diversity (iCKO)

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Runx1 Controls Auditory Sensory Neuron Diversity (CKO)

Project description:As the primary sensory neurons of the auditory system, Type I spiral ganglion neurons (SGNs) encode sound stimulus properties critical for the formation of auditory percept in higher brain areas. Their functional heterogeneity is thought to contribute to our ability to hear a wide range of sound intensities and against background noise, but how SGN diversity arises during development is poorly understood. Here we studied the role of the transcription factor Runx1 in establishing SGN heterogeneity in the mouse cochlea by single cell RNA-sequencing.

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Runx1 Controls Auditory Sensory Neuron Diversity (iCKO)

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Runx1 controls auditory sensory neuron diversity in mice.

Project description:Sound stimulus is encoded in mice by three molecularly and physiologically diverse subtypes of sensory neurons, called Ia, Ib, and Ic spiral ganglion neurons (SGNs). Here, we show that the transcription factor Runx1 controls SGN subtype composition in the murine cochlea. Runx1 is enriched in Ib/Ic precursors by late embryogenesis. Upon the loss of Runx1 from embryonic SGNs, more SGNs take on Ia rather than Ib or Ic identities. This conversion was more complete for genes linked to neuronal function than to connectivity. Accordingly, synapses in the Ib/Ic location acquired Ia properties. Suprathreshold SGN responses to sound were enhanced in Runx1CKO mice, confirming the expansion of neurons with Ia-like functional properties. Runx1 deletion after birth also redirected Ib/Ic SGNs toward Ia identity, indicating that SGN identities are plastic postnatally. Altogether, these findings show that diverse neuronal identities essential for normal auditory stimulus coding arise hierarchically and remain malleable during postnatal development.

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WT vs Hypomethylated DRG Gene Expression

Project description:Although DNA methylation plays a critical role in the development and function of mammalian central nervous system (CNS), its role in peripheral neurons has not been elucidated. To address this issue, we produced conditional knockout mice (CKO) specifically deleting the gene for maintenance DNA methyltransferase 1 (Dnmt1) during the development of neural crest cells. Despite global hypomethylation in the embryonic dorsal root ganglion (DRG) of the CKO mice, the number of sensory neurons was relatively unaffected. However, expression of many genes required for sensory neuron development was altered in embryonic mutant DRG, including down-regulation of Runx1 and TrkA genes as well as up-regulation of Id1 and Dtx1, two negative regulators for neurogenesis. Accompanied with the downregulation of an NGF receptor TrkA, the peripheral axonal projection and the branching of sensory neurons were impaired. Furthermore, the expression of the neuropeptide Galanin and several vanilloid receptors such as TrpV1 and TrpM8 were not detected in the DRG of the CKO mice during late embryonic and neonatal stages, suggesting that DNA methylation regulates the differentiation program for a subset of nociceptive sensory neurons. Taken together, our findings suggest that through transcriptional regulation of key developmental genes in sensory neurons, DNA methylation play a key role in the control of the axonal projection and fate specification of peripheral sensory neurons. We compared gene expression patterns in Wildtype and DNA methylation deficient (Wnt1-cre; Dnmt1 mutant) mouse dorsal cortex. We performed 4 replicates using different each individual mouse strain. The Sample GSM565172 table is the average log ratio for the 4 replicatesArrays were performed.

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