在ISWI染色体重塑复合物中,NSD2和H3K36me2被招募到 pericentromeric异染色体中
Naoki Goto1, Kazuma Suke2, Nao Yonezawa2
1School of Life Science and Technology, Tokyo Institute of Technology , Yokohama, Japan.
The Journal of cell biology
|May 6, 2024
概括
基因组H3 lysine36二甲基化 (H3K36me2) 通常存在于基因体中,但可以向异性染色素. 通过像WICH这样的ISWI复合体招募的NSD2酶驱动这种异色 H3K36me2局部化.
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.
- 染色体生物学 染色体生物学
- 分子机制的分子机制
背景情况:
- 基因组H3 lysine36二甲基化 (H3K36me2) 是一种关键的表观遗传标记,通常在基因体和 euchromatin 中发现.
- 表观遗传标记的异常局部化可以影响细胞功能和发育.
- 控制H3K36me2局部化的机制,特别是对异色色素的局部化,仍然不完全理解.
研究的目的:
- 为了阐明负责准H3K36me2到周围中心分子异性色素的分子机制.
- 为了确定涉及异色彩H3K36me2沉积的特定蛋白质和复合物.
- 调查异色 H3K36me2.2. 的潜在生理相关性.
主要方法:
- 基因组甲基转移酶和相关蛋白质的枯竭和过度表达分析.
- 染色体免疫沉 (ChIP) 测试以评估H3K36me2的分布.
- 生物化学测试用于研究蛋白质-蛋白质和蛋白质-DNA相互作用.
- 分析小鼠细胞系和早期小鼠胚胎.
主要成果:
- 鉴定出 histone 甲基转移酶 NSD2 是主要的酶,负责诱导 H3K36me2 在 pericentromeric heterochromatin.
- 通过模仿开关 (ISWI) 染色体重塑复合体,特别是BAZ1B-SMARCA5 (WICH) 中介NSD2对异色染色体的招募.
- WICH的BAZ1B亚单元通过AT状基因直接结合AT丰富的DNA,从而促进NSD2向.
- NSD2,SMARCA5和BAZ1B的丰度和固体几何学影响了H3K36me2在不同细胞类型的局部化.
- 在早期小鼠胚胎 (两到四细胞阶段) 中观察到异色 H3K36me2 局部化,这表明生理相关性.
结论:
- NSD2,与像WICH这样的ISWI复合体结合,提供了一个将H3K36me2向异色素的机制.
- H3K36me2的精确定位是由特定蛋白质复合体的相互作用及其丰度动态调节的.
- 在早期胚胎发生过程中,异色素H3K36me2的存在表明它在发育过程中起着重要作用.
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