MSH2/MSH6 complex promotes error-free repair of AID-induced dU:G mispairs as well as error-prone hypermutation of A:T sites.

MSH2/MSH6 complex promotes error-free repair of AID-induced dU:G mispairs as well as error-prone hypermutation of A:T sites.
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DOI:
10.1371/journal.pone.0011182
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发表时间:
2010-06-17
期刊:
影响因子:
3.7
通讯作者:
Scharff MD
Scharff MD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Roa S;Li Z;Peled JU;Zhao C;Edelmann W;Scharff MD

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AID产生的DU:G错配修复是B细胞类开关重组(CSR)和体细胞超突变(SHM)的关键。此前无法获得的msh2−/−msh6−/−小鼠的产生首次使我们能够研究mutsα完全丧失对淋巴增生症、CSR和SHM的影响。T细胞淋巴瘤的发生和msh2−/−msh6−/−和msh2−/−msh6−/−msh3−/−小鼠的存活与msh2−/−小鼠没有区别,这表明msh2在保护T细胞免于恶性转化方面发挥了关键作用,可能是因为它对于形成稳定的MutSα异源二聚体保持基因组稳定是必不可少的。在msh2−/−、msh2−/−msh6−/−和msh2−/−msh6−/−msh3−/−小鼠中,类似的开关缺陷证实了MutSα而不是MutSβ在CSR中起重要作用。对msh2−/−msh6−/−小鼠的扫描电镜分析不仅证实了mutsα在A:T碱基链偏向突变的产生中容易出错的作用,还揭示了mutsα在修复由AID产生的两条DNA链上的一些Du:G错配时的无错误作用。我们提出了一个模型,说明MutSα在免疫球蛋白基因座上的作用,其中无错修复和易错修复的局部平衡对SHM第二阶段引入的突变谱有影响。
Mismatch repair of AID-generated dU:G mispairs is critical for class switch recombination (CSR) and somatic hypermutation (SHM) in B cells. The generation of a previously unavailable Msh2−/−Msh6−/− mouse has for the first time allowed us to examine the impact of the complete loss of MutSα on lymphomagenesis, CSR and SHM. The onset of T cell lymphomas and the survival of Msh2−/−Msh6−/− and Msh2−/−Msh6−/−Msh3−/− mice are indistinguishable from Msh2−/− mice, suggesting that MSH2 plays the critical role in protecting T cells from malignant transformation, presumably because it is essential for the formation of stable MutSα heterodimers that maintain genomic stability. The similar defects on switching in Msh2−/−, Msh2−/−Msh6−/− and Msh2−/−Msh6−/−Msh3−/− mice confirm that MutSα but not MutSβ plays an important role in CSR. Analysis of SHM in Msh2−/−Msh6−/− mice not only confirmed the error-prone role of MutSα in the generation of strand biased mutations at A:T bases, but also revealed an error-free role of MutSα when repairing some of the dU:G mispairs generated by AID on both DNA strands. We propose a model for the role of MutSα at the immunoglobulin locus where the local balance of error-free and error-prone repair has an impact in the spectrum of mutations introduced during Phase 2 of SHM.
DOI: 10.1084/jem.187.11.1745
发表时间: 1998-06-01
期刊: The Journal of experimental medicine
影响因子: --
作者:
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在类切换中检查MSH6-和MSH3缺陷型小鼠,发现MUTS同源物在抗体多样化中的重叠和不同的作用。
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DOI: 10.1016/s0960-9822(02)01215-0
发表时间: 2002-10-15
期刊: CURRENT BIOLOGY
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