组织素变体H2A.W限制了Arabidopsis中的异色交叉
Namil Son1, Heejin Kim1, Jaeil Kim1
1Department of Life Sciences, Pohang University of Science and Technology, Pohang 37673, Republic of Korea.
概括
基素变异H2A.W.6和H2A.W.7限制了 pericentromeric heterochromatin 中的介质交叉. 这些变异的丧失会增加交叉事件,影响后代的多样性.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 介质交叉对遗传多样性至关重要,并且在染色体上非随机发生.
- 由H3K9me2和H2A.W标记的围心组异性色素,显示的交叉比 euchromatin.com更少.
- H2A.W在调节周心体交叉的作用以前是未知的.
研究的目的:
- 为了研究H2A.W变异在*Arabidopsis thaliana*中控制介质交叉分布中的功能.
- 为了确定H2A.W是否会影响周围中心的异色染色体中的交叉频率.
主要方法:
- 介质分裂特异性微RNA诱导的基因沉默 (meiMIGS) 以击败H2A.W变种.
- 用光标记的重组记者可视化交叉事件.
- 交叉的高分辨率基因组映射和核细胞密度分析 (MNase-seq).
主要成果:
- H2A.W.6/7/12中介性淘汰显著增加了周心层交叉.
- 在H2A.W.6和H2A.W.7,但不是H2A.W.12的突变,phenocopied增加的异色交叉.
- 在 H2A.W 突变中,表现出异色染色素可访问性增加和 H3K9me2 水平降低.
结论:
- H2A.W.6和H2A.W.7对于抑制 pericentromeric heterochromatin 中的介质交叉至关重要.
- H2A.W 变体作为异色染色体紧缩因子,影响交叉分布.
- 这些发现揭示了H2A.W在调节基因组稳定性和遗传变异方面的新角色.
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