Repeated strand invasion and extensive branch migration are hallmarks of meiotic recombination.

Repeated strand invasion and extensive branch migration are hallmarks of meiotic recombination.
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反复的链入侵和广泛的分支迁移是减数分裂重组的标志。

DOI:
10.1016/j.molcel.2021.08.003
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发表时间:
2021-10-21
期刊:
影响因子:
16
通讯作者:
Lichten M
Lichten M
中科院分区:
生物学1区
文献类型:
--
作者:
Ahuja JS;Harvey CS;Wheeler DL;Lichten M

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目前流行的减数分裂重组模型认为,非交换和交换重组都是由DNA双链断裂引发的,但形成的机制不同:非交换是由合成依赖性链退火引起的;交换是由以断裂为中心的双霍利迪连接的形成和分解引起的。这种双重机制的假设预测不同的杂交DNA模式在非交换和交换重组。我们表明,这些预测是不支持的,通过映射与前所未有的分辨率亲本链的贡献,重组在一个模型位点。相反,在非交叉和交叉中的断裂修复涉及合成依赖性链退火,通常伴随多轮链侵入。交叉特异性双霍利迪连接形成通过涉及分支迁移作为一个整体特征的过程发生,其可以与断裂本身的修复分开。这些发现揭示了减数分裂重组是一个高度动态的过程,并提示一个新的观点之间的关系交换和非交换重组。Ahuja等人分析了亲本链对减数分裂重组体的贡献,并得出结论,在非交换和交换形成过程中使用了相同的断裂修复机制。他们还得出结论,交叉,而不是noncrossovers,产生的决议双霍利迪路口的形成涉及分支迁移作为一个整体功能。
Currently favored models for meiotic recombination posit that both noncrossover and crossover recombination are initiated by DNA double strand breaks but form by different mechanisms: noncrossovers by synthesis dependent strand annealing; and crossovers by formation and resolution of double Holliday junctions centered around the break. This dual mechanism hypothesis predicts different hybrid DNA patterns in noncrossover and crossover recombinants. We show that these predictions are not upheld, by mapping with unprecedented resolution parental strand contributions to recombinants at a model locus. Instead, break repair in both noncrossovers and crossovers involves synthesis-dependent strand annealing, often with multiple rounds of strand invasion. Crossover-specific double Holliday junction formation occurs via processes involving branch migration as an integral feature, that can be separated from repair of the break itself. These findings reveal meiotic recombination to be a highly dynamic process and prompt a new view of the relationship between crossover and noncrossover recombination. Ahuja et al. analyze parental strand contributions to meiotic recombinants and conclude that the same break-repair mechanism is used during noncrossover and crossover formation. They also conclude that crossovers, but not noncrossovers, are produced by the resolution of double Holliday junctions whose formation involves branch migration as an integral feature.
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