Chromosome break-induced DNA replication leads to nonreciprocal translocations and telomere capture.

Chromosome break-induced DNA replication leads to nonreciprocal translocations and telomere capture.
复制标题

染色体断裂诱导的 DNA 复制导致不可逆易位和端粒捕获。

DOI:
10.1093/genetics/150.3.1037
复制
发表时间:
1998
期刊:
影响因子:
3.3
通讯作者:
Haber,JE
Haber,JE
中科院分区:
生物学2区
文献类型:
--
作者:
Bosco,G;Haber,JE

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在酵母中,断裂的染色体可以通过重组修复,从而导致非互易易位。在单倍体细胞中,遭受HO内切酶诱导的双链断裂(DSB),近2%的断裂染色体末端与另一侧染色体末端附近的序列重组,该序列与切割序列只有72 bp的同源性。这就产生了一条修复后的染色体,两端都有相同的20kb序列。构建二倍体菌株,其中断裂的染色体仅在DSB的着丝粒近端与未断裂的染色体具有同源性。这些细胞中有一半以上是通过复制未断裂的模板染色体上断裂的远端序列来修复DSB的。这些事件均与RAD52相关。系谱分析证实,G1期发生的dsb通过复制机制修复,产生两个相同的子细胞。我们讨论了这些数据在理解端粒酶独立的端粒复制、基因扩增和染色体末端进化方面的意义。
In yeast, broken chromosomes can be repaired by recombination, resulting in nonreciprocal translocations. In haploid cells suffering an HO endonuclease-induced, double-strand break (DSB), nearly 2% of the broken chromosome ends recombined with a sequence near the opposite chromosome end, which shares only 72 bp of homology with the cut sequence. This produced a repaired chromosome with the same 20-kb sequence at each end. Diploid strains were constructed in which the broken chromosome shared homology with the unbroken chromosome only on the centromere-proximal side of the DSB. More than half of these cells repaired the DSB by copying sequences distal to the break from the unbroken template chromosome. All these events were RAD52 dependent. Pedigree analysis established that DSBs occurring in G1 were repaired by a replicative mechanism, producing two identical daughter cells. We discuss the implications of these data in understanding telomerase-independent replication of telomeres, gene amplification, and the evolution of chromosomal ends.
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