Role of DNA polymerases in repeat-mediated genome instability.
Role of DNA polymerases in repeat-mediated genome instability.
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DOI:
10.1016/j.celrep.2012.10.006
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发表时间:
2012-11-29
期刊:
影响因子:
8.8
通讯作者:
Mirkin SM
中科院分区:
文献类型:
--
作者:
Shah KA;Shishkin AA;Voineagu I;Pavlov YI;Shcherbakova PV;Mirkin SM
Expansions of simple DNA repeats cause numerous hereditary diseases in humans. We analyzed the role of DNA polymerases in the instability of Friedreich’s ataxia (GAA)n repeats in a yeast experimental system. The elementary step of expansion corresponded to ~160 bp in the wild type strain, matching the size of Okazaki fragments in yeast. This step increased when DNA polymerase α was mutated suggesting a link between the scale of expansions and Okazaki fragment size. Expandable repeats strongly elevated the rate of mutations at substantial distances around them, a phenomenon we call repeat-induced mutagenesis (RIM). Notably, defects in the replicative DNA polymerases δ and ε strongly increased rates for both repeat expansions and RIM. The increases in repeat-mediated instability observed in DNA polymerase δ mutants depended on translesion DNA polymerases. We conclude that repeat expansions and RIM are two sides of the same replicative mechanism.
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