Polk mutant mice have a spontaneous mutator phenotype.

Polk mutant mice have a spontaneous mutator phenotype.
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DOI:
10.1016/j.dnarep.2009.09.003
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发表时间:
2009-12-03
期刊:
影响因子:
3.8
通讯作者:
Friedberg EC
Friedberg EC
中科院分区:
医学3区
文献类型:
--
作者:
Stancel JN;McDaniel LD;Velasco S;Richardson J;Guo C;Friedberg EC

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Polk基因(编码DNA聚合酶κ)缺陷的小鼠是可以存活的,并且没有表现出明显的表型。目前的研究记录了Polk−/−小鼠中的自发突变表型。这些小鼠中增强的自发突变的最初指示来自于对假定的创始者突变的偶然观察,该突变在包含所有三种可能的Polk基因型的小鼠队列中表现为多种疾病状态。携带报告基因转基因(λ-噬菌体cII基因)的Polk−/−和同基因野生型对照用于随后对各种组织中诱变的定量和定性研究。我们观察到Polk−/−小鼠的肾脏、肝脏和肺中突变频率显著增加,但脾脏或睾丸中没有。G:C碱基对在肾、肝和肺的突变谱中占主导地位。这些结果与Polκ是精确的跨损伤DNA合成所需的概念一致,所述跨损伤DNA合成经过天然存在的多环鸟嘌呤加合物,可能由胆固醇和/或其代谢产物产生。
Mice defective in the Polk gene (which encodes DNA polymerase kappa) are viable and do not manifest obvious phenotypes. The present studies document a spontaneous mutator phenotype in Polk−/− mice. The initial indication of enhanced spontaneous mutations in these mice came from the serendipitous observation of a postulated founder mutation that manifested in multiple disease states among a cohort of mice comprising all three possible Polk genotypes. Polk−/− and isogenic wild type controls carrying a reporter transgene (the λ-phage cII gene) were used for subsequent quantitative and qualitative studies on mutagenesis in various tissues. We observed significantly increased mutation frequencies in the kidney, liver, and lung of Polk−/− mice, but not in the spleen or testis. G:C base pairs dominated the mutation spectra of the kidney, liver, and lung. These results are consistent with the notion that Polκ is required for accurate translesion DNA synthesis past naturally occurring polycyclic guanine adducts, possibly generated by cholesterol and/or its metabolites.
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