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
中科院分区:
文献类型:
--
作者:
Guo C;Gerasimova T;Hao H;Ivanova I;Chakraborty T;Selimyan R;Oltz EM;Sen R
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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