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

Changying Guo, Tatiana Gerasimova, Haiping Hao, Irina Ivanova, Tirtha Chakraborty, Roza Selimyan, Eugene M. Oltz, Ranjan Sen

Research output: Contribution to journalArticlepeer-review

Abstract

The immunoglobulin heavy-chain (IgH) gene locus undergoes radial repositioning 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 multilooped 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 V H region. Eμ is also required for radial repositioning 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.

Original languageEnglish (US)
Pages (from-to)332-343
Number of pages12
JournalCell
Volume147
Issue number2
DOIs
StatePublished - Oct 14 2011

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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