Lambda light chain revision in the human intestinal IgA response.

Lambda light chain revision in the human intestinal IgA response.
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DOI:
10.4049/jimmunol.181.2.1264
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发表时间:
2008-07-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Spencer J
Spencer J
中科院分区:
其他
文献类型:
--
作者:
Su W;Gordon JN;Barone F;Boursier L;Turnbull W;Mendis S;Dunn-Walters DK;Spencer J

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通过成熟B细胞中的二级重排对抗体轻链进行修改具有改变免疫应答的特异性靶点的潜力。在这里,我们第一次表明,轻链修订是正常的,广泛存在于人类最大的抗体产生群体;肠道伊加浆细胞。在λ轻链的生产性和非生产性库中的偏差、具有RAG基因和蛋白质的修订和鉴定的特征偏差的重排的环状产物的鉴定都反映了正常肠伊加浆细胞发育期间的修订。我们没有看到免疫球蛋白重链修订的证据,可能是由于不适当的重组信号序列的方向,和很少的证据,κ链修订,可能是由于基因座失活的κ删除元件。我们提出,λ轻链位点是可用的,并且是肠道伊加浆细胞中抗体特异性的主要修饰剂和多样化剂。
Revision of antibody light chains by secondary rearrangement in mature B cells has the potential to change the specific target of the immune response. Here we show for the first time that light chain revision is normal and widespread in the largest antibody producing population in man; intestinal IgA plasma cells. Biases in the productive and non-productive repertoire of lambda light chains, identification of the circular products of rearrangement that have the characteristic biases of revision and identification of RAG genes and protein all reflect revision during normal intestinal IgA plasma cell development. We saw no evidence of immunoglobulin heavy chain revision probably due to inappropriately orientated recombination signal sequences, and little evidence of kappa chain revision, probably due to locus inactivation by the kappa deleting element. We propose that the lambda light chain locus is available and a principal modifier and diversifier of antibody specificity in intestinal IgA plasma cells.
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