Role for DNA repair factor XRCC4 in immunoglobulin class switch recombination.

Role for DNA repair factor XRCC4 in immunoglobulin class switch recombination.
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DOI:
10.1084/jem.20070255
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发表时间:
2007-07-09
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
de Villartay JP
de Villartay JP
中科院分区:
其他
文献类型:
--
作者:
Soulas-Sprauel P;Le Guyader G;Rivera-Munoz P;Abramowski V;Olivier-Martin C;Goujet-Zalc C;Charneau P;de Villartay JP

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V(D)J重组和免疫球蛋白类别转换重组(CSR)是通过在DNA中引入双链断裂(DSB)进行的两种体细胞重排机制。尽管DNA修复因子XRCC4对于V(D)J重组过程中DNA DSB的解决是必不可少的,但其在CSR中的作用尚未确定。为了绕过小鼠中XRCC4缺失的胚胎致死性,我们使用LoxP侧翼的XRCC4 cDNA慢病毒转基因开发了条件性XRCC4敲除(KO)。在这些小鼠中,XRCC 4的B淋巴细胞限制性缺失导致体内和体外CSR平均降低两倍。我们的研究结果将XRCC4和非同源末端连接DNA修复途径与CSR联系起来,同时反映了在XRCC4不存在的情况下,在CSR DSB修复中可能使用替代途径。此外,这种新的条件性KO方法在研究小鼠中的其他致死突变时应该是有用的。
V(D)J recombination and immunoglobulin class switch recombination (CSR) are two somatic rearrangement mechanisms that proceed through the introduction of double-strand breaks (DSBs) in DNA. Although the DNA repair factor XRCC4 is essential for the resolution of DNA DSB during V(D)J recombination, its role in CSR has not been established. To bypass the embryonic lethality of XRCC4 deletion in mice, we developed a conditional XRCC4 knockout (KO) using LoxP-flanked XRCC4 cDNA lentiviral transgenesis. B lymphocyte restricted deletion of XRCC4 in these mice lead to an average two-fold reduction in CSR in vivo and in vitro. Our results connect XRCC4 and the nonhomologous end joining DNA repair pathway to CSR while reflecting the possible use of an alternative pathway in the repair of CSR DSB in the absence of XRCC4. In addition, this new conditional KO approach should be useful in studying other lethal mutations in mice.
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