Altered kinetics of nonhomologous end joining and class switch recombination in ligase IV-deficient B cells.

Altered kinetics of nonhomologous end joining and class switch recombination in ligase IV-deficient B cells.
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DOI:
10.1084/jem.20081623
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发表时间:
2008-11-24
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Yu K
Yu K
中科院分区:
其他
文献类型:
--
作者:
Han L;Yu K

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免疫球蛋白重链类开关重组(CSR)被认为是通过在长而重复的开关区域产生和修复DNA双链断裂(DSBs)而发生的。虽然暗示,主要的脊椎动物DSB修复途径,非同源末端连接(NHEJ),在CSR中的作用一直存在争议。通过体细胞基因靶向能够在体外高效CSR的B细胞系(CH12F3)中的DNA连接酶IV (Lig4, NHEJ的关键成分),我们发现NHEJ是高效CSR所必需的。CH12F3细胞中Lig4基因的破坏严重抑制了CSR的初始速率,并在细胞因子刺激下导致细胞晚期增殖缺陷。然而,与绝对需要NHEJ的V(D)J重组不同,CSR在无lig4细胞中积累到相当高的水平。数据显示,在CSR期间,一个快速作用的NHEJ和一个缓慢作用的开关区域断裂的替代端连接。
Immunoglobulin heavy chain class switch recombination (CSR) is believed to occur through the generation and repair of DNA double-strand breaks (DSBs) in the long and repetitive switch regions. Although implied, the role of the major vertebrate DSB repair pathway, nonhomologous end joining (NHEJ), in CSR has been controversial. By somatic gene targeting of DNA ligase IV (Lig4; a key component of NHEJ) in a B cell line (CH12F3) capable of highly efficient CSR in vitro, we found that NHEJ is required for efficient CSR. Disruption of the Lig4 gene in CH12F3 cells severely inhibits the initial rate of CSR and causes a late cell proliferation defect under cytokine stimulation. However, unlike V(D)J recombination, which absolutely requires NHEJ, CSR accumulates to a substantial level in Lig4-null cells. The data revealed a fast-acting NHEJ and a slow-acting alterative end joining of switch region breaks during CSR.
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