单一的霍利德连接是介质重组的中间体
Gareth A Cromie1, Randy W Hyppa, Andrew F Taylor
1Division of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, P.O. Box 19024, Seattle, WA 98109, USA.
Cell
|December 19, 2006
概括
在酵母半转化中,研究人员发现单一的霍利德结,而不是双重的,是主要的中间体,优先形成在姐妹染色体之间. 这一发现完善了基因重组和染色体分离的模型.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 同性染色体交叉对准备精确的分离在变化过程中至关重要.
- 现有的模型建议双休日结作为这个过程中的关键中间体.
- 这些模型表明,双霍利代结主要在同类染色体之间形成.
研究的目的:
- 为了研究在Schizosaccharomyces pombe中在化过程中形成的占主导地位的中间结构.
- 为了阐明特定蛋白质的作用,如Mus81,在霍莱德连接分辨率.
- 提出一种统一的遗传重组模型,适用于半分裂和小分裂.
主要方法:
- 对Schizosaccharomyces pombe中介性重组中间体的分析.
- 基因分析以确定Mus81对霍莱德交叉点分辨率的要求.
- 不同酵母物种 (Saccharomyces cerevisiae和Schizosaccharomyces pombe) 之间的重组途径的比较.
主要成果:
- 单个霍利德结,而不是双,被确定为Schizosaccharomyces pombe meiosis中占主导地位的中间体.
- 这些单一的霍莱德连接主要是在姐妹染色体之间形成的,与Saccharomyces cerevisiae中的发现形成鲜明对比.
- 已经证明Mus81内核酶对于在体内解决霍莱德结点至关重要.
结论:
- 主要的介质性重组中间体在酵母物种之间有所不同,单一的霍莱德结在Schizosaccharomyces pombe.中是关键.
- Mus81-Eme1复合体作为霍莱德结结溶酶,支持其在处理这些结构中的作用.
- 一个经过修订的统一模型表明,单一的霍利德结可以从单一或双链断裂中产生,解释了在半分裂和小分裂中重新组合的启动.
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