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Impact of Cry1 KO on single-cell genomic program during iPSC reprogramming

ABSTRACT: Impact of Cry1 KO on single-cell genomic program during iPSC reprogramming

PROVIDER: PRJNA960859 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR24279427.fastq.gz	Fastqsanger.gz
	SRR24279428.fastq.gz	Fastqsanger.gz
	SRR24279429.fastq.gz	Fastqsanger.gz
	SRR24279430.fastq.gz	Fastqsanger.gz
	SRR24279431.fastq.gz	Fastqsanger.gz

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Impact of Cry1 KO on single-cell genomic program during iPSC reprogramming

Project description:We profiled genome-wide gene expression duirng iPSC reprogramming from Cry1 KO and the wild-type MEFs at the single cell resolution

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Project description:We conducted RNA-sequencing from three per group C57BL/6J male mice, ten weeks old. Liver tissue was collected from wild-type (WT) and Cryptochrome1 (CRY1) knockout (KO) mice.

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Project description:Restricted feeding impacts the hepatic circadian clock of WT mice. Cry1, Cry2 double KO mice lack a circadian clock and are thus expected to show rhythmical gene expression in the liver. Imposing a temporally restricted feeding schedule on these mice shows how the hepatic circadian clock and rhythmic food intake regulate rhythmic transcription in parallel Cry1, Cry2 double KO mice were entrained either to ad libitum or temporally restricted feeding (tRF) schedules. Food was made available to mice under the tRF regimen only between ZT(CT)1 and ZT(CT)9. Mice were then released into constant darkness while the respective feeding schedules were still maintained. Liver tissue was collected on the second day of constant darkness at the indicated timepoints. Total RNA was extracted and 5ug of RNA was used in the standard Affymetrix protocol for amplification, labeling and hybridization

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Project description:The circadian clock and rhythmic food intake are both important regulators of rhythmic gene expression in the liver. It remains, however, elusive to which extent the circadian clock network and natural feeding rhythms contribute to rhythmic gene expression. To systematically address this question, we developed an algorithm to investigate differential rhythmicity between a varying number of conditions. Mouse knockout models of different parts of the circadian clock network (Bmal1, Cry1/2, and Hlf/Dbp/Tef) exposed to controlled feeding regimens (ad libitum, night restricted feeding) were generated and analyzed for their temporal hepatic transcriptome. A genetical ablation of core loop elements altered feeding patterns that were restored by night restricted feeding. Mainly genes with a high amplitude were driven by the circadian clock but natural feeding patterns equally contributed to rhythmic gene expression with lower amplitude. We observed that Bmal1 and Cry1/2 KOs differed in rhythmic gene expression and identified differences in mean expression levels as a predictor for rhythmic gene expression. In Hlf/Dbp/Tef KO, mRNA levels of Hlf/Dbp/Tef target genes were decreased, albeit rhythmicity was overall preserved potentially due to the activity of the D-Box binding repressor NFIL3. Genes that lost rhythmicity in Hlf/Dbp/Tef KOs were identified to be no direct targets of PARbZip factors and presumably lost rhythmicity due to indirect effects. Collectively, our findings provide unprecedent insights into the diurnal transcriptome in mouse liver and defines the contribution of subloops of the circadian clock network and natural feeding cycles. The developed algorithm and a webapp to browse the outcomes of the study are publicly available to serve as a resource for the scientific community.

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