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复制叉的运动设定了哺乳动物细胞中的染色质环大小和起源选择

Sylvain Courbet¹, Sophie Gay, Nausica Arnoult

¹Institut Curie, 26 rue d'Ulm, 75248 Paris, France; UPMC Univ. Paris 06, F-75005 Paris, France.

|August 22, 2008

概括

复制速度通过影响染色体循环组织来影响DNA起源使用. 更快的复制速度导致后续细胞周期中的特定起源激活模式,确保基因组的稳定性.

科学领域:

分子生物学分子生物学
细胞生物学细胞生物学
遗传学是一个遗传学.

背景情况:

基因组的稳定性依赖于精确的DNA复制,每S阶段有一个重复.
已知防止重复复制的机制,但起源间隔控制仍然不清楚.

研究的目的:

调查DNA复制叉的进展和染色质组织如何影响起源的使用.
阐明控制DNA启动事件间隔的机制.

主要方法:

在不同复制速度下,研究了中国仓鼠细胞的起源使用.
分析了复制速度,染色质循环大小和起源激活之间的相关性.

主要成果:

减缓的复制速度招募了潜在的起源,以保持及时完成S阶段.
在改变复制速度后恢复原始效率需要一个完整的细胞周期.
复制速度与随后的G1阶段染色蛋白循环大小相关.
在G1染色蛋白环点的起源在下一个S阶段优先激活.

结论:

复制速度程序通过影响染色质循环 anchorage.通过影响染色质循环.
这种机制确保了基因组稳定性的启动位点的适当间距.

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