针对性刺激中介性重组的目标刺激
Ana Peciña1, Kathleen N Smith, Christine Mézard
1Institut Curie, Section de Recherche, CNRS UMR 144, Paris, France.
Cell
|November 1, 2002
概括
介质重组依赖于由Spo11.开始的DNA双链断裂 (DSBs). 将Spo11定位到特定的DNA位点可以刺激DSB的形成和控制重组,即使是在以前不活跃的位置.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 酵母研究的酵母研究.
背景情况:
- 在Saccharomyces cerevisiae中, meiotic重组是由被编程的DNA双链断裂 (DSB) 启动的.
- DSB形成是由Spo11蛋白催化,通常发生在可访问的基因间区域.
- 控制DSB频率和染色体分布的因素尚未完全理解.
研究的目的:
- 研究DNA结合蛋白在准Spo11和影响介质重组热点中的作用.
- 确定将Spo11定向到特定位置是否可以克服自然的DSB冷位置.
主要方法:
- 使用一个Spo11构造与Gal4 DNA结合域 (Gal4BD-Spo11) 融合.
- 评估了Gal4BD-Spo11拯救spo11Delta突变和催化DSB形成的能力.
- 分析了在天然部位和靠近Gal4结合部位的DSB形成和重组,包括GAL2位点.
主要成果:
- Gal4BD-Spo11结构挽救了spo11Delta子的无活性,并在自然地点催化了DSB.
- 在Gal4结合部位附近显著刺激了DSB的形成.
- 一个天然的DSB冷位 (GAL2) 被Gal4BD-Spo11转化为重组热点,这取决于其他DSB基因功能.
结论:
- 将Spo11针对特定的DNA序列足以刺激介质重组.
- 这种有针对性的方法可以在以前不活跃的位置创建重组热点.
- 通过将DSB启动机器引导到特定的基因组位置,可以通过生理学来控制 meiotic 重组.
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