Increased hypermutation at G and C nucleotides in immunoglobulin variable genes from mice deficient in the MSH2 mismatch repair protein.

Increased hypermutation at G and C nucleotides in immunoglobulin variable genes from mice deficient in the MSH2 mismatch repair protein.
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DOI:
10.1084/jem.187.11.1745
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发表时间:
1998-06-01
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Gearhart PJ
Gearhart PJ
中科院分区:
其他
文献类型:
--
作者:
Phung QH;Winter DB;Cranston A;Tarone RE;Bohr VA;Fishel R;Gearhart PJ

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在抗原刺激B淋巴细胞后,重排的免疫球蛋白可变基因会发生广泛突变。突变可能是由一种易错的DNA聚合酶产生的,而错配修复途径可能会处理这些错配。为了研究MSH2错配修复蛋白在超突变中的作用,用恶唑酮对Msh2 -/-小鼠进行免疫,并分析B细胞其VκOx1轻链基因的突变情况。修复缺陷型小鼠的突变频率与Msh2 +/+小鼠相似,表明依赖MSH2的错配修复不会引起超突变。然而,在种系G和C核苷酸处发生突变存在显著的偏向性。结果表明,超突变途径经常使G·C碱基对发生突变,而一种依赖MSH2的途径优先纠正G和C处的错配。
Rearranged immunoglobulin variable genes are extensively mutated after stimulation of B lymphocytes by antigen. Mutations are likely generated by an error-prone DNA polymerase, and the mismatch repair pathway may process the mispairs. To examine the role of the MSH2 mismatch repair protein in hypermutation, Msh2 −/− mice were immunized with oxazolone, and B cells were analyzed for mutation in their VκOx1 light chain genes. The frequency of mutation in the repair-deficient mice was similar to that in Msh2 +/+ mice, showing that MSH2-dependent mismatch repair does not cause hypermutation. However, there was a striking bias for mutations to occur at germline G and C nucleotides. The results suggest that the hypermutation pathway frequently mutates G·C pairs, and a MSH2-dependent pathway preferentially corrects mismatches at G and C.
体细胞变异先于种系序列的广泛多样化和免疫球蛋白重链多样性进化中的组合连接。
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