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Characterization of Transcriptomes of Apical OHCs and Basal OHCs in Cochlea

ABSTRACT: Characterization of Transcriptomes of Apical OHCs and Basal OHCs in Cochlea

PROVIDER: PRJNA436547 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6794663_1.fastq.gz	Fastqsanger.gz
	SRR6794663_2.fastq.gz	Fastqsanger.gz
	SRR6794664_1.fastq.gz	Fastqsanger.gz
	SRR6794664_2.fastq.gz	Fastqsanger.gz
	SRR6794665_1.fastq.gz	Fastqsanger.gz

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Characterization of Transcriptomes of Apical OHCs and Basal OHCs in Cochlea

Project description:We analyzed the transcriptomes of 30 isolated apical OHCs and basal OHCs from rat cochlea, and the results showed that more than 50 genes were differentially expressed and 20 genes were uniquely expressed among these populations. We analyzed these genes with a focus on their functions related to cellular structure and transmembrane channels and their vulnerability to and involvement in hereditary deafness caused by OHC defects. Our results could serve as a guideline for exploring the molecular mechanisms underlying the biological properties of OHCs.

2018-03-02 | GSE111302 | GEO

Gene expression profiles along the tonotopic axis of the mouse cochlea during neonatal development

Project description:The cochlear duct is tonotopically organized, such that the basal cochlea responds more sensitively to high frequency sounds and the apical cochlea to low frequency sounds. In effort to understand how the tonotopic organization is established in mammals, we searched for genes that are differentially expressed along the tonotopic axis during neonatal development. Eighty temporal bones were dissected from C57BL/6 mice at P0 and P8. The cochlear tissues were divided into three equal pieces representing the basal, middle and apical turns, and pooled separately. Six total RNA from the pooled samples were applied to 6 GeneChips.

2011-12-13 | E-GEOD-34187 | biostudies-arrayexpress

Gene expression profiles along the tonotopic axis of the mouse cochlea during neonatal development

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Project description:Lgr5+ supporting cells (SCs) are enriched hair cell (HC) progenitors in the cochlea, and several studies have shown a difference in the proliferation and HC regeneration ability of SCs between the apical and basal turns. However, the detailed differences between the transcriptomes of the apical and basal Lgr5+ SCs have not yet been investigated. We found that when isolated by FACS, Lgr5+ cells from the apex generated significantly more HCs and had significantly higher proliferation and mitotic HC regeneration ability compared to those from the base. Next, we used microarray analysis to determine the transcriptome expression profiles of Lgr5+ progenitors from the apex and the base. We first analyzed the genes that were enriched and differentially expressed in Lgr5+ progenitors from the apex and the base. Then we analyzed the cell cycle genes and the transcription factors that might regulate the proliferation and differentiation of Lgr5+ progenitors. Lastly, to further analyze the role of differentially expressed genes and to gain an overall view of the gene network in cochlear HC regeneration, we created a protein-protein interaction network. Our datasets suggest the possible genes that might regulate the proliferation and HC regeneration ability of Lgr5+ progenitors, and these genes might provide new therapeutic targets for HC regeneration in the future.

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Project description:The epiblast is the first cell type that forms apical-basal polarity de novo as the mouse embryo implants into the maternal uterus, while the extraembryonic neighbours of the epiblast - trophectoderm and primitive endoderm - retain their pre-established polarity beyond implantation [1]; however, it is still unclear how the epiblast establishes apical-basal polarity de novo. Here, we focused on Rap1 signaling pathway, which is activated during the transition of the epiblast from the naïve to primed state of pluripotency during implantation [2]. Through the preestablished in vitro three-dimensional culture system [3], genetic knockouts and proximity-biotinylation analyses, we found that Rap1 integrates multiple signals that contribute to de novo formation of apical-basal polarity. Importantly, formation of apical-basal polarity in the epiblast is essential for its correct patterning and proper communication with the extraembryonic lineages. Altogether, these results not only dissect molecular details of de novo apical-basal polarity formation, but also have broader implications for epithelial polarity and development.

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Project description:This study demonstrates the baseline data of gradient gene expression in the cochlea. Especially for genes whose mutations cause autosomal dominant non syndromic hearing loss (Pou4f3, Slc17a8, Tmc1, and Crym) as well as genes important for cochlear function (Emilin-2 and Tectb), gradual expression changes help to explain the various pathological conditions. Four C57BL/6 mice aged 6 weeks cochlea samples including the lateral wall, stria vascularis, spiral ligament, spiral prominence, and the organ of corti were dissected and separated into the apical, middle and basal turns to compare gene expression profiles of each cochlea turn.

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