鼠标的微生物双链断裂形成,处理和修复
Julian Lange1, Shintaro Yamada2, Sam E Tischfield3
1Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
Cell
|October 18, 2016
概括
对于基因组稳定至关重要的一种微生物重组,涉及DNA双链断裂 (DSB). 这项研究揭示了细度的热点结构和大规模的性染色体抑制,详细描述了塑造重组景观的机制.
科学领域:
- 遗传学
- 分子生物学
- 表观遗传学
背景情况:
- 精子重组通过DNA双链断裂 (DSB) 开始,这对遗传性和基因组稳定性至关重要.
- 不随机分布的DSB受不太了解的机制的影响.
- 了解 DSB 景观形成是解读 meiotic 过程的关键.
研究的目的:
- 在核酸分辨率下研究介质重组的空间特征和调节机制.
- 发现DSB形成,染色质结构和PRDM9和ATM等关键蛋白质之间的关系.
- 提供DSB切除及其与重组产品的空间关联的全面分析.
主要方法:
- 高核酸分辨率的小鼠DSB的全基因组映射.
- 与染色体特征相关的DSB分布分析,包括核细胞甲基化.
- 调查SPO11,PRDM9和ATM在DSB形成和景观塑造中的作用.
主要成果:
- 在甲基化核酶体之间发生DSB的刻板细度热点结构.
- 通过ATM显示了非同类性染色体区域的DSB形成抑制.
- 通过ATM在自体和性染色体之间形成大规模的DSB景观.
- 提供了DSB切除长度和与重组产品的空间关系的全基因组分析.
结论:
- 哺乳动物的介质重组场景是由细度的染色体相互作用和大规模的染色体调节形成的.
- 在定义DSB分布和重组模式方面,PRDM9和ATM发挥着至关重要的作用.
- 这项研究为了解调节性重组的分子机制提供了详细的框架.
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