CTCF-binding elements mediate control of V(D)J recombination.

CTCF-binding elements mediate control of V(D)J recombination.
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CTCF结合元件介导V(d)J重组的控制。

DOI:
10.1038/nature10495
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发表时间:
2011-09-11
期刊:
影响因子:
64.8
通讯作者:
Alt, Frederick W.
Alt, Frederick W.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Guo, Chunguang;Yoon, Hye Suk;Franklin, Andrew;Jain, Suvi;Ebert, Anja;Cheng, Hwei-Ling;Hansen, Erica;Despo, Orion;Bossen, Claudia;Vettermann, Christian;Bates, Jamie G.;Richards, Nicholas;Myers, Darienne;Patel, Harin;Gallagher, Michael;Schlissel, Mark S.;Murre, Cornelis;Busslinger, Meinrad;Giallourakis, Cosmas C.;Alt, Frederick W.

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免疫球蛋白重链(IgH)可变区外显子由发育中的B淋巴细胞中的VH、D和JH基因片段组装而成。在2.7 Mb的小鼠IgH基因座(IgH)内,V(D)J重组受到调节,以确保特异性和多样性的抗体库。在此,我们报告了一个关键的IgH V(D)J重组调控区,称为基因间控制区-1(IGCR 1),位于VH和D簇之间。在功能上,IGCR 1采用CTCF循环/绝缘子因子结合元件,并相应地介导含有远端增强子的IgH环。IGCR 1促进正常B细胞发育,并通过抑制DH近端VH的转录和重排以及促进远端VH的重排来平衡抗体库。IGCR 1分别通过抑制胸腺细胞中VH连接至未连接至JH的Ds和VH连接至DJH来维持有序的和谱系特异性的VH(D)JH重组。IGCR 1也需要允许反馈调节和等位基因排斥近端VH到DJH重组。我们的研究阐明了一个长期寻找的IgH V(D)J重组控制区,并暗示了普遍表达的CTCF蛋白的新作用。
Immunoglobulin heavy chain (IgH) variable region exons are assembled from VH, D and JH gene segments in developing B lymphocytes. Within the 2.7 megabase (Mb) mouse IgH locus (IgH), V(D)J recombination is regulated to ensure specific and diverse antibody repertoires. Herein, we report a key IgH V(D)J recombination regulatory region, termed InterGenic Control Region-1 (IGCR1), that lies between the VH and D clusters. Functionally, IGCR1 employs CTCF looping/insulator factor binding elements and, correspondingly, mediates IgH loops containing distant enhancers. IGCR1 promotes normal B cell development and balances antibody repertoires by inhibiting transcription and rearrangement of DH-proximal VHs and promoting rearrangement of distal VHs. IGCR1 maintains ordered and lineage-specific VH(D)JH recombination, respectively, by suppressing VH joining to Ds not joined to JHs and VH to DJH joins in thymocytes. IGCR1 also is required to allow feedback regulation and allelic exclusion of proximal VH to DJH recombination. Our studies elucidate a long-sought IgH V(D)J recombination control region and implicate a new role for the generally expressed CTCF protein.
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