Contribution of DNA polymerase eta to immunoglobulin gene hypermutation in the mouse.

Contribution of DNA polymerase eta to immunoglobulin gene hypermutation in the mouse.
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DOI:
10.1084/jem.20050292
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发表时间:
2005-04-18
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Reynaud CA
Reynaud CA
中科院分区:
其他
文献类型:
--
作者:
Delbos F;De Smet A;Faili A;Aoufouchi S;Weill JC;Reynaud CA

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在缺乏DNA聚合酶η的小鼠中研究了免疫球蛋白基因的突变模式,DNA聚合酶η是一种跨损伤聚合酶,其失活导致人类的着色性干皮病变异型(XP - V)综合征。突变呈现出85%的G/C偏向模式,与XP - V患者的报道相似。将这些小鼠与在其DNA聚合酶ι基因中携带129/OlaIn背景的终止密码子突变的动物进行繁殖,并没有进一步改变这种模式。尽管这种G/C偏向的突变特征类似于错配修复复合物中MSH2或MSH6成分缺失的小鼠,但polη缺陷小鼠的残余A/T诱变有显著差异。这表明,在缺乏polη的情况下,MSH2 - MSH6复合物能够招募另一种在复制A/T碱基时更准确的DNA聚合酶,可能是polκ,以承担其在超突变中的功能。
The mutation pattern of immunoglobulin genes was studied in mice deficient for DNA polymerase η, a translesional polymerase whose inactivation is responsible for the xeroderma pigmentosum variant (XP-V) syndrome in humans. Mutations show an 85% G/C biased pattern, similar to that reported for XP-V patients. Breeding these mice with animals harboring the stop codon mutation of the 129/Olain background in their DNA polymerase ι gene did not alter this pattern further. Although this G/C biased mutation profile resembles that of mice deficient in the MSH2 or MSH6 components of the mismatch repair complex, the residual A/T mutagenesis of polη-deficient mice differs markedly. This suggests that, in the absence of polη, the MSH2–MSH6 complex is able to recruit another DNA polymerase that is more accurate at copying A/T bases, possibly polκ, to assume its function in hypermutation.
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