基因组甲基转移酶的基因组分析揭示了DNMT3B在基因甲基化中的作用
Tuncay Baubec1, Daniele F Colombo1, Christiane Wirbelauer1
1Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland.
Nature
|January 22, 2015
概括
DNA甲基转移酶DNMT3A和DNMT3B针对特定的基因组区域. 它们的活性是由DNA序列和基因素修改指导的,确保了哺乳动物发育和疾病预防的适当DNA甲基化模式.
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.
- 分子生物学分子生物学
- 基因组学就是基因组学.
背景情况:
- 基因甲基化是调节基因表达和发育的关键表观遗传标记.
- 新型DNA甲基转移酶 (DNMT3A,DNMT3B) 建立甲基化模式,而DNMT1则维持它们.
- DNA甲基化失调与发育缺陷和人类疾病有关.
研究的目的:
- 研究新型DNA甲基转移酶DNMT3A和DNMT3B的基因组结合和活性.
- 了解控制DNA甲基转移酶招募和活体中的功能的调节机制.
- 为了阐明序列和染色体特征如何直接DNA甲基化模式.
主要方法:
- 在小鼠干细胞中对DNMT3A和DNMT3B进行基因组定位研究.
- 测量 de novo DNA 甲基化活性的特定位置测量.
- 对DNMT3B针对转录的基因的分析,包括对基因组修饰 (H3K36me2) 和蛋白质域 (PWWP) 的评估.
主要成果:
- DNMT3A和DNMT3B与甲基化,CpG密集的区域结合,但避免活性促进剂和增强剂.
- 酶活性与结合部位相关,随着CpG密度的增加而增加,并避免核细胞.
- DNMT3B选择性地与转录的基因体结合,导致它们的偏好的甲基化,依赖于SETD2及其PWWP域.
结论:
- 基因组序列和染色质线索,包括H3K36me2,指导新的DNA甲基转移酶.
- 这些机制确保精确准DNMT3A和DNMT3B活动,保持甲基组完整性.
- 了解这些过程对于破译发育和疾病中的表观遗传调节至关重要.
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