Mapping of a functional recombination motif that defines isotype specificity for mu-->gamma3 switch recombination implicates NF-kappaB p50 as the isotype-specific switching factor.

Mapping of a functional recombination motif that defines isotype specificity for mu-->gamma3 switch recombination implicates NF-kappaB p50 as the isotype-specific switching factor.
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定义MU-> gamma3开关重组的同种特异性的功能重组基序的映射暗示NF-kappab P50是同种型特异性开关因子。

DOI:
10.1084/jem.20031935
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发表时间:
2004-03-01
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Zhang H
Zhang H
中科院分区:
其他
文献类型:
--
作者:
Kenter AL;Wuerffel R;Dominguez C;Shanmugam A;Zhang H

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Ig类开关重组(CSR)需要激活诱导脱氨酶(AID)的表达和种系转录本的产生,以靶S区进行重组。然而,企业社会责任的机制尚不清楚。在这里,我们表明染色体外S质粒测定是AID依赖的,并且对于同型特异性CSR来说,单一的共识重复是必要和充分的。转染的μ→γ3和μ→γ1特异性开关底物分别用脂多糖(LPS)或脂多糖和白细胞介素-4刺激开关。仅含有三个Sγ3相关核苷酸的Sγ3/Sγ1底物重建了LPS响应性,并允许定位μ→γ3 CSR特异性的功能性重组基序。这个功能性重组基序与NF-κB p50的结合位点共定位,并且p50与该位点的结合是先前建立的。我们在p50缺失的B细胞中发现基于质粒的μ→γ - 3 CSR需要p50。与野生型细胞相比,缺乏p50的B细胞的开关连接在s γ - 3和s γ - 3之间的微同源性长度减少,这表明p50在CSR机制中起作用。我们注意到p50和Msh2缺乏对μ/ s γ - 3连接的影响之间存在惊人的相似之处。提示p50可能是μ→γ - 3 CSR的同型特异性因子,并与Msh2具有上位性。
Ig class switch recombination (CSR) requires expression of activation-induced deaminase (AID) and production of germline transcripts to target S regions for recombination. However, the mechanism of CSR remains unclear. Here we show that an extrachromosomal S plasmid assay is AID dependent and that a single consensus repeat is both necessary and sufficient for isotype-specific CSR. Transfected switch substrates specific for μ→γ3 and μ→γ1 are stimulated to switch with lipopolysaccharide (LPS) alone or LPS and interleukin-4, respectively. An Sγ3/Sγ1 substrate containing only three Sγ3-associated nucleotides reconstituted LPS responsiveness and permitted mapping of a functional recombination motif specific for μ→γ3 CSR. This functional recombination motif colocalized with a binding site for NF-κB p50, and p50 binding to this site was previously established. We show a p50 requirement for plasmid-based μ→γ3 CSR using p50-deficient B cells. Switch junctions from p50-deficient B cells showed decreased lengths of microhomology between Sμ and Sγ3 relative to wild-type cells, indicating a function for p50 in the mechanics of CSR. We note a striking parallel between the affects of p50 and Msh2 deficiency on Sμ/Sγ3 junctions. The data suggest that p50 may be the isotype-specific factor in μ→γ3 CSR and epistatic with Msh2.
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