Regulation of DNA methylation landscape in human somatic cell reprogramming by miR-29 family (MeDIP-seq)
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE81793 | GEO | 2016/05/24
SECONDARY ACCESSION(S): PRJNA322542
REPOSITORIES: GEO
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Project description:Reprogramming to pluripotency after overexpression of OCT4, SOX2, KLF4 and MYC is accompanied by global genomic and epigenomic changes. Histone modification and DNA methylation states in iPSCs have been shown to be highly similar with embryonic stem cells (ESCs). However, epigenetic differences still exist between iPSCs and ESCs. In particular, aberrant DNA methylation states found in iPSCs are a major concern for using iPSCs in a clinical setting. Thus, it is critical to find factors that regulate DNA methylation states in reprogramming. Here, we found that the miR-29 family is an important epigenetic regulator during human somatic cell reprogramming. Our global DNA methylation and hydroxymethylation analysis shows that DNA demethylation is a major event mediated by miR-29a depletion during early reprogramming, and that iPSCs derived from miR-29a depletion are epigenetically closer to ESCs. Our findings uncover an important miRNA-based approach to generate clinically robust iPSCs.
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Project description:Induced pluripotent stem cells (iPSCs) can be derived from somatic cells through ectopic expression of transcriptional factors or chemical cocktails. Chemical reprogramming might be safe than transcriptional factors since there is no integration of exogenous genes. However, there is still little direct evidence to prove this hypothesis. In this study, we have performed whole genome profiling of the DNA methylomes of mouse chemical iPSCs (CiPSCs), transcriptional factors induced iPSCs (TF-iPSCs) and embryonic stem cells (ESCs). We find that the methylation levels of high-CpG-density promoters (HCPs) and intermediate- CpG-density promoters (ICPs) have no significant difference among them, but low-CpG-density promoters (LCP) and three retrotransposons (LINEs, LTRs and SINEs) show preference to different methylation levels. Surprisingly, CiPSCs are hypomethylated than TF-iPSCs and the major difference of methylation levels lies in the intergenic regions while two iPSCs lines are generally hypermethylated compared to ESCs. Moveover, we find the methylation states of imprinting control regions (ICRs) and the expression of imprinted genes of CiPSCs are more resemble ESCs than TF-iPSCs. Our data first provide the epigenetic states of chemical induced pluripotent stem cells and compare the difference of mouse CiPSCs, TF-iPSCs and ESCs. These observations might affect ongoing choices of reprogramming methods for disease modeling and give some guides for potential therapeutic applications.
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