Mus musculus
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA341522 | ENA |
REPOSITORIES: ENA
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Project description:The rd1 mouse retina is a well-studied model of retinal degeneration where rod photoreceptors undergo cell death beginning at postnatal day P10 until P21. This period coincides with photoreceptor terminal differentiation in a normal retina. We have used the rd1 retina as a model to investigate early molecular defects in developing rod photoreceptors prior to the onset of degeneration. Using a microarray approach, we performed gene profiling comparing rd1 and wild type retinas at four time points starting at P2, prior to any obvious biochemical or morphological differences, and concluding at P8, prior to the initiation of cell death. We have identified genes that are differentially regulated in the rd1 retina at early time points, which may give insights into developmental defects that precede photoreceptor cell death. This is the first report of PRA1 expression in the retina. Our data support the hypothesis that PRA1 plays an important role in vesicular trafficking between the Golgi and cilia in differentiating and mature rod photoreceptors. Retinal samples were harvested from both rd1/le and wt animals at postnatal days 2, 4, 6, and 8 for microarray. Each sample included 8-14 retinas and experiments were performed in quadruplicate. Ten micrograms of total RNA was used for cDNA systhesis in target molecule production.
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Project description:Purpose - To determine transcriptomic variations in the mouse cochlea in response to three different transcription factor overexpression conditions and no induction control and to determine transcriptomic and accessible chromatin variations in the mouse cochlea between postnatal day 1 (P1) and postnatal day 8 (P8) stages of development. Methods - SC RNA seq performed on FACS enriched cells obtained from experimental animals (Sox9CreER; Rosa26A/GA/GAP/+; Rosa26 tdtomato). Same samples at two timepoints 1 week (P8) and 2 week (P15) ages. scMultiome ATAC + Gene Expression (10x Genomics) experiments on enzymatically dissociated and unenriched cochlear nuclei from wildtype mice in a mixed background of CD1 and FVB/NJ, and C57BL/6. Samples were collected at P1 and P8. Gene expression data was used to annotate clusters. Chromatin accessibility determined by ATAC was compared between P1 and P8 stages. Results - The SC RNA seq highlighted differential transcriptomic changes between the two ages and the three overexpression conditions. Hair cell loci become less epigenetically accessible in supporting cells and GER cells between P1 and P8. Conclusions - Our study highlights the variability in transcriptomic response to three transcription factor combination mediated reprogramming cues at two different ages. The SC RNA seq confirmed a variety of our biological observations with regard to the hair cell reprogramming process in the mouse cochlea. We also demonstrate variability in chromatin accessibility between P1 and P8, which may explain why GER and supporting cells of the cochlea become more resistant to transcription factor reprogramming into hair cells during the first postnatal week.
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2012-11-02 | GSE41821 | GEO
Project description:Early postnatal development in wt and rd1 mouse retina
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