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Genome-wide map of open chromatin, trancription factor occupancy, chromatin marks and gene expression profiles in mouse nephron progenitor cells

ABSTRACT: Genome-wide map of open chromatin, trancription factor occupancy, chromatin marks and gene expression profiles in mouse nephron progenitor cells

PROVIDER: PRJNA542676 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR9049100_1.fastq.gz	Fastqsanger.gz
	SRR9049100_2.fastq.gz	Fastqsanger.gz
	SRR9049580_1.fastq.gz	Fastqsanger.gz
	SRR9049580_2.fastq.gz	Fastqsanger.gz

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Mapping open chromatin in mouse nephron progenitor cells

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Mapping open chromatin in mouse nephron progenitor cells

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Genome-wide map of open chromatin, trancription factor occupancy, chromatin marks and gene expression profiles in mouse nephron progenitor cells

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Project description:Mammalian chromatin is dynamic and contains structural information that leads to transcriptional regulation of genes by recruiting transcription factors and altering nucleosome positioning. Here, we describe open chromatin mapping using Nicking Enzyme assisted sequencing (NicE-seq) for integrative epigenomic analysis. NicE-seq captures open chromatin sites in both fixed and native cells and reveals the genomic location of open chromatin sites (OCS) and transcription factor occupancy at single nucleotide resolution, with as few as 250 HCT116 cells. In HCT116 cells a large percentage of the OCS were coincident with DHS (DNaseI hypersensitive site) and ATAC-seq sites. OCSs correlated well with RNA pol II occupancy and transcriptionally active chromatin marks, while displaying a pattern contrasting to CpG methylation. ChIP CTCF peaks common to OCS and DHS displayed a strong correlation with H3K4me3 and H3K27ac marks. Further peaks unique to OCS and ChIP CTCF peaks also correlated strongly with H3K4me3, H3K27ac and higher transcription. Similar results were also obtained for Max and Sp1 transcription factors. Using NicE-seq we have demonstrated that HCT116 cells, treated with anti cancer drug decitabine, displayed time dependent accumulation of OCS coinciding with hypomethylation of the genome, particularly in SINE and satellite repetitive DNA. Differentially methylated regions (DMRs) were more pronounced in promoters, 5’UTR, CpG islands and exons. In summary, sequence specificity offered by a nicking enzyme allows a means to study open chromatin structure and hypomethylation of genomes, revealing the open chromatin landscape in cellular context.

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Project description:Background: Nephron progenitor cells (NPCs) undergo a stepwise process to generate all mature nephron structures. Mesenchymal to epithelial transition (MET) is considered a multi-step process of NPC differentiation to ensure progressive establishment of new nephrons. However, despite this important role, to date, no marker for NPCs undergoing MET in the nephron exists. Results: Here, we identify LGR6 as a NPC marker, expressed in very early cap mesenchyme, pre-tubular aggregates, renal vesicles and in segments of S-shaped bodies, following the trajectory of MET. By using a lineage tracing approach in embryonic explants in combination with confocal imaging and single-cell RNA sequencing, we provide evidence for the multiple fates of LGR6+ cells during embryonic nephrogenesis. Moreover, by using long-term in vivo lineage tracing, we show that postnatal LGR6+ cells are capable of generating the multiple lineages of the nephrons. Conclusion: Given the profound early mesenchymal expression and MET signature of LGR6+ cells, together with the lineage tracing of mesenchymal LGR6+ cells, we conclude that LGR6+ cells contribute to all nephrogenic segments by undergoing MET. LGR6+ cells can therefore be considered an early committed NPC population during embryonic and postnatal nephrogenesis with potential regenerative capability.

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Project description:Six2+ cap mesenchyme cells, also called nephron progenitor cells (NPC), are a multipotent stem cell population and precursors of all epithelial cell types of the nephron, the filtering unit of the kidney. In mammals, formation of new nephrons ceases perinatally associated with a surge in NPC differentiation. Current evidence indicates that perinatal “old” NPC have a greater tendency to exit the progenitor niche and differentiate into nascent nephrons than their embryonic “young” counterparts. Understanding the biological underpinnings of NPC aging may offer insights to rejuvenate old NPC and expand the progenitor pool. In the present study, we compared the chromatin landscape of young and old NPC and found common features reflecting their shared lineage but also intrinsic differences in chromatin accessibility and enhancer landscape supporting the view that old NPC and epigenetically poised for differentiation. Annotation of open chromatin regions and active enhancers uncovered the transcription factor Bach2 as a potential link between the pro-renewal MAPK/AP1 and pro-differentiation Six2/b-catenin pathways that might be of critical importance in regulation of NPC fate. Our data provide the first glimpse of the dynamic chromatin landscape of NPC and serve as a platform for future studies of the impact of genetic or environmental perturbations on the epigenome of NPC.

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2021-01-07 | GSE131116 | GEO

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