同类参与控制介质DNA断裂数和分布
Drew Thacker1, Neeman Mohibullah2, Xuan Zhu1
11] Molecular Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10065, USA [2] Weill Graduate School of Medical Sciences of Cornell University, New York, New York 10065, USA.
Nature
|April 11, 2014
概括
细胞控制的DNA双链断裂 (DSBs) 介质变异期间涉及负反. 缺乏ZMM蛋白质的Saccharomyces cerevisiae表现出增加的DSB形成,揭示了这些因素在调节重组中的意想不到的作用.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 介质性重组对于遗传多样性和适当的染色体分离至关重要.
- 启动重组的双链断裂 (DSB) 是潜在的突变原体,并可能导致介质失败.
- 控制DSB形成以平衡利益和风险的机制尚未完全理解.
研究的目的:
- 调查DSB控制涉及相互连接的负面监管电路的假设.
- 确定ZMM蛋白在调节DSB形成中的作用.
- 了解跨染色体重组的空间模式.
主要方法:
- 使用Saccharomyces cerevisiae作为一个模型生物体.
- 采用多种互补的实验方法来分析DSB形成.
- 生成全基因组的DSB地图,以评估分布和调节.
主要成果:
- 缺乏ZMM蛋白质的细胞表现出增加的DSB形成,挑战了ZMMs仅作为下游因素的观点.
- 发现ZMM-依赖的DSB控制与Ndt80介导途径有遗传差异.
- ZMM突变zip3影响了染色体大小的DSB密度变化,表明它在空间模式中的作用.
结论:
- 涉及ZMM蛋白质的负反机制有助于调节化过程中DSB的形成.
- 同性染色体的参与似乎表明DSB形成的停止.
- ZMM蛋白质,特别是Zip3,在介质重组的空间组织中发挥着重要作用.
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