Misregulation of the IgH Locus in Thymocytes.

Misregulation of the IgH Locus in Thymocytes.
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DOI:
10.3389/fimmu.2018.02426
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发表时间:
2018
影响因子:
7.3
通讯作者:
Sen R
Sen R
中科院分区:
医学2区
文献类型:
--
作者:
Kumari G;Gerasimova T;Du H;De S;Wood WH 3rd;Becker KG;Sen R

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功能性抗原受体基因的组装是通过体细胞重排,主要是淋巴细胞谱系特异性。免疫球蛋白重链(IgH)基因位点在7个抗原受体位点中是独特的,在错误的谱系中进行部分基因重排。在这里,我们证明谱系特异性的破坏与T细胞发育过程中Eμ增强子被不同的转录因子不适当激活有关,而这些转录因子与发育中的B细胞不同。这反映在CD4+CD8+ (DP)胸腺细胞中增强子诱导的表观遗传变化减少、erna减少、rag1 /2富集重组中心的形成、染色质环的减弱以及DH基因片段的明显不同利用上。此外,尽管两种谱系的转录因子结合相似,但在DP细胞中,ctcf依赖的VH位点压实被破坏。这些观察结果确定了促进谱系特异性抗原受体基因组装的多种机制。
Functional antigen receptor genes are assembled by somatic rearrangements that are largely lymphocyte lineage specific. The immunoglobulin heavy chain (IgH) gene locus is unique amongst the seven antigen receptor loci in undergoing partial gene rearrangements in the wrong lineage. Here we demonstrate that breakdown of lineage-specificity is associated with inappropriate activation of the Eμ enhancer during T cell development by a different constellation of transcription factors than those used in developing B cells. This is reflected in reduced enhancer-induced epigenetic changes, eRNAs, formation of the RAG1/2-rich recombination center, attenuated chromatin looping and markedly different utilization of DH gene segments in CD4+CD8+ (DP) thymocytes. Additionally, CTCF-dependent VH locus compaction is disrupted in DP cells despite comparable transcription factor binding in both lineages. These observations identify multiple mechanisms that contribute to lineage-specific antigen receptor gene assembly.
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