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成肌细胞甲基化组:与染色质和转录的多种关联类型

The myoblast methylome: multiple types of associations with chromatin and transcription.

作者信息

Sen Sagnik, Lacey Michelle, Baribault Carl, Ponnaluri V K Chaithanya, Esteve Pierre Olivier, Ehrlich Kenneth C, Meletta Mia, Pradhan Sriharsa, Ehrlich Melanie

机构信息

Molecular Genetics and Genomics, New England Biolabs, Ipswich, MA, USA.

Department of Mathematics, Tulane University, New Orleans, LA, USA.

出版信息

Epigenetics. 2025 Dec;20(1):2508251. doi: 10.1080/15592294.2025.2508251. Epub 2025 Jun 11.

Abstract

Epigenetic changes are implicated in development, repair, and physiology of postnatal skeletal muscle (SkM). We generated methylomes for human myoblasts (SkM progenitor cells) and determined myoblast differentially methylated regions (DMRs) for comparison to the epigenomics and transcriptomics of diverse cell types. Analyses were from global genomic and single-gene perspectives and included reporter gene assays. One atypical finding was the association of promoter-adjacent hypermethylation in myoblasts with transcription turn-on, but at downmodulated levels, for certain genes (., and ). In contrast, brain-specific was in repressed chromatin and silent in most cell types but linked to hypermethylated DMRs specifically in myoblasts. The -linked DMRs might be needed because of the overlapping or nearby binding of myogenic differentiation protein 1 (MYOD). We found genome-wide overlap of DMRs with MYOD or CCCTC-binding factor (CTCF) binding sites in myoblasts that is consistent with the importance of MYOD, as well as CTCF, in organizing myoblast transcription-enhancing chromatin interactions. We also observed some gene upregulation correlated with a special association of regional DNA hypomethylation with H3K36me3, H3K27ac, and H3K4me1 enrichment. Our study highlights unusual relationships between epigenetics and gene expression that illustrate the interplay between DNA methylation and chromatin epigenetics in the regulation of transcription.

摘要

表观遗传变化与出生后骨骼肌(SkM)的发育、修复和生理功能有关。我们生成了人类成肌细胞(SkM祖细胞)的甲基化组,并确定了成肌细胞差异甲基化区域(DMRs),以便与多种细胞类型的表观基因组学和转录组学进行比较。分析从全基因组和单基因角度进行,包括报告基因检测。一个非典型发现是,成肌细胞中启动子相邻的高甲基化与某些基因(如……和……)的转录开启相关,但转录水平下调。相比之下,脑特异性……在大多数细胞类型中处于抑制染色质状态且沉默,但在成肌细胞中与高甲基化的DMRs特异性相关。由于肌源性分化蛋白1(MYOD)的重叠或附近结合,可能需要与……相关的DMRs。我们发现成肌细胞中DMRs与MYOD或CCCTC结合因子(CTCF)结合位点在全基因组范围内重叠,这与MYOD以及CTCF在组织成肌细胞转录增强染色质相互作用中的重要性一致。我们还观察到一些基因上调与区域DNA低甲基化与H3K36me3、H3K27ac和H3K4me1富集的特殊关联相关。我们的研究突出了表观遗传学与基因表达之间的异常关系,阐明了DNA甲基化与染色质表观遗传学在转录调控中的相互作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c94f/12160609/613ca3ef0a6e/KEPI_A_2508251_F0001_OC.jpg

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