跨组织的DNA低甲基化模式揭示了细胞发育的遗传不同的历史
Timothy J Scott1, Tyler J Hansen2,3, Evonne McArthur1,4
1Vanderbilt Genetics Institute, Vanderbilt University School of Medicine, Nashville, TN, 37232, USA.
BMC genomics
|October 19, 2023
概括
在DNA中,低甲基化区域 (HMR) 存储细胞身份和发育史. 这些DNA甲基化模式对于预测细胞表型和揭示特征的遗传贡献至关重要.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因组学就是基因组学.
- 发展生物学 发展生物学
背景情况:
- DNA甲基化 (DNAme) 模式对于细胞分化至关重要,但它们在细胞表型中的确切作用尚不清楚.
- 低甲基化区域 (HMRs),包括数万个CpG位点,在转录上是允许的,可以是细胞类型特定的,调节基因表达.
研究的目的:
- 系统地分析不同类型的人体细胞和发育阶段的HMR模式.
- 研究非编码HMR在细胞身份和基因调控中的功能意义.
- 探索HMRs,遗传遗传性和细胞特征之间的关系.
主要方法:
- 在人类细胞类型和发育时间点之间对126,104种不同的HMR进行无监督聚类.
- 从胚胎干细胞到成熟的造血细胞的伪时间过程分析.
- 从GWAS总结统计数据中分析基于SNP的分区遗传性.
主要成果:
- HMR的特异性反映了发育层次结构,大多数HMR是在发育早期建立的.
- HMRs经常聚集,形成增强增强剂活性的区域,它们的建立与细胞分化相关.
- 各种特征的遗传性在HMR中得到了丰富,特异性和聚类与特征相关性相关.
结论:
- 完整的HMR,而不仅仅是特定于细胞类型的HMR,包含了解和预测细胞表型的关键信息.
- HMR提供了一个独特的,遗传编码的细胞发育轨迹的历史记录.
- 人类基因组组代表了一类功能上独特的表观基因组注释,对细胞身份和功能至关重要.
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