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在Arabidopsis thaliana中,H2A.X促进了内精特异性的DNA甲基化

Jennifer M Frost¹, Jaehoon Lee², Ping-Hung Hsieh¹

¹Department of Plant and Microbial Biology, University of California, Berkeley.

Research square

|June 19, 2023

概括

希斯H2A.X对于维护DNA甲基化恒温在阿拉比多普西斯内中至关重要. 失去H2A.X导致全基因组DNA低甲基化,特别是在转子体中,影响生殖发育.

科学领域:

表观遗传学和DNA甲基化
植物繁殖和发展植物繁殖和发展
染色体生物学染色体生物学

背景情况:

H2A.X 是一种对DNA损伤反应和修复至关重要的基因素变体.
促进染色体交易 (FACT) 复合体介导H2A.X的替代,并参与DNA脱甲基化通过DME.
实际上,FACT和DME在繁殖过程中涉及Arabidopsis雌性性质细胞中的DNA脱甲基化.

研究的目的:

为了研究H2A.X在DME和FACT介导的DNA脱甲基化在Arabidopsis繁殖过程中的作用.
为了确定H2A.X是否影响生殖组织中的DNA甲基化模式.

主要方法:

产生和分析阿拉比多普西斯H2A.X双突变物 (h2a.x).
在正在发育的阿拉比多普西斯组织中分析H2A.X和DME的表达.
全基因组双硫酸盐测序 (WGBS) 用于评估h2a.x突变者的DNA甲基化.

主要成果:

h2a.x突变体的生长正常,但对基因毒性压力的敏感性增加.
H2A.X在繁殖组织中表达很高,包括类细胞.
在h2a.x突变种子中观察到全基因组的CG DNA低甲基化,特别是在内体内的转子体中.
在h2a.x突变体中的低甲基化位点与DME目标和其他异色彩区域重叠.

结论:

需要H2A.X来维持DNA甲基化恒温在阿拉比多的内.
H2A.X可能会阻止DME进入非正规站点或招募甲基转移酶.
这些发现强调了H2A.X在植物繁殖过程中的表观遗传调节中的作用.

关键词:

德米特尔 (Demeter) 是一个女神.对DNA损伤的反应反应脱甲基化DNA脱甲基化基因糖化酶是DNA的糖化酶.表观遗传学在表观遗传学中,表观遗传学是指表观遗传学.H2A.XX. 的时间.

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