来自血液构造祖先的血统承诺的综合甲基组地图
Hong Ji1, Lauren I R Ehrlich, Jun Seita
1Center for Epigenetics and Department of Medicine, Johns Hopkins University School of Medicine, 570 Rangos, 725 N. Wolfe St., Baltimore, Maryland 21205, USA.
Nature
|August 20, 2010
概括
在血液细胞发育过程中,DNA甲基化模式发生变化. 这项研究绘制了血液生成原体中的这些表观遗传变化,揭示了关键的基因和涉及髓状与淋巴状差异化的途径.
科学领域:
- 血液学 血液学 血液学
- 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
背景情况:
- 血统特异分化依赖于表观遗传修饰,因为DNA序列在终端分化的细胞中保持不变.
- 血液形成,即血细胞形成的过程,作为研究细胞命运决定期间表观遗传变化的模型.
- 虽然DNA甲基化对于骨髓/淋巴细胞分化至关重要,但缺乏血液生成原始体的全面DNA甲基化地图.
研究的目的:
- 为了创建一个全面的DNA甲基化地图的各种血液形成的祖先种群.
- 为了研究DNA甲基化和基因表达在骨髓与淋巴细胞分化过程中的关系.
- 为了确定涉及到血液构造血统承诺的新基因和途径.
主要方法:
- 在特定的造血原生种群 (MPPs,CLPs,CMPs,GMPs,DN1-3) 中对460万个CpG位点进行全基因组分析.
- 对差异性DNA甲基化与基因表达模式的相关性分析.
- 使用DNA甲基转移酶抑制剂进行功能评估,以观察血统歪曲.
主要成果:
- 在淋巴细胞和骨髓细胞限制期间观察到显著的表观遗传可塑性.
- 与淋巴细胞结合相比,骨髓状结合显示出较低的全球DNA甲基化.
- 不同的DNA甲基化与基因表达相关,特别是在CpG岛屿海岸.
- 识别了以前未被识别的基因 (例如,Arl4c,Jdp2) 和转录因子 (例如,Meis1),参与了血统选择.
- 表观遗传调节器本身的表观遗传修饰与差异化有关.
结论:
- 在血统特异性造血分化过程中,DNA甲基化是动态调节的.
- 这项研究提供了一个全面的甲基化和转录变化在骨髓与淋巴细胞命运决策期间的地图.
- 表观遗传机制,包括DNA甲基化,在调节造血干细胞分化和维持细胞身份方面发挥着关键作用.
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