Two forms of loops generate the chromatin conformation of the immunoglobulin heavy-chain gene locus.

Two forms of loops generate the chromatin conformation of the immunoglobulin heavy-chain gene locus.
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DOI:
10.1016/j.cell.2011.08.049
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发表时间:
2011-10-14
期刊:
影响因子:
64.5
通讯作者:
Sen R
Sen R
中科院分区:
生物学1区
文献类型:
--
作者:
Guo C;Gerasimova T;Hao H;Ivanova I;Chakraborty T;Selimyan R;Oltz EM;Sen R

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免疫球蛋白重链(IgH)基因座在细胞核内经历径向重新定位和基因座收缩,为基因重组做准备。我们表明,IgH基因座构象涉及两个层次的染色体压缩。在第一水平,基因座折叠成几个多环结构域。位于基因座3′端的一个这样的结构域需要一个增强子Eμ;位于5′端的另外两个结构域不依赖于Eμ。在第二水平,这些结构域通过与VH区内的特定位点的依赖于Eμ的相互作用而在空间上接近。IgH等位基因的径向重新定位也需要Eμ,表明其在发育中的淋巴细胞中的大规模染色体运动中起重要作用。我们的观察结果提供了一个全面的看法IgH等位基因在前B细胞的构象和机制,它是建立。
The immunoglobulin heavy chain (IgH) gene locus undergoes radial re-positioning within the nucleus and locus contraction in preparation for gene recombination. We demonstrate that IgH locus conformation involves two levels of chromosomal compaction. At the first level the locus folds into several multi-looped domains. One such domain at the 3′ end of the locus requires an enhancer, Eμ; two other domains at the 5′ end are Eμ-independent. At the second level, these domains are brought into spatial proximity by Eμ-dependent interactions with specific sites within the VH region. Eμ is also required for radial re-positioning of IgH alleles indicating its essential role in large scale chromosomal movements in developing lymphocytes. Our observations provide a comprehensive view of the conformation of IgH alleles in pro-B cells and the mechanisms by which it is established.
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