Recombination and transcription of the endogenous Ig heavy chain locus is effected by the Ig heavy chain intronic enhancer core region in the absence of the matrix attachment regions Academic Article Article uri icon


MeSH Major

  • Cell Cycle Proteins
  • DNA-Activated Protein Kinase
  • DNA-Binding Proteins
  • Protein-Serine-Threonine Kinases
  • Recombination, Genetic
  • Tumor Suppressor Proteins


  • The intronic Ig heavy chain (IgH) enhancer, which consists of the core enhancer flanked by 5' and 3' matrix attachment regions, has been implicated in control of IgH locus recombination and transcription. To elucidate the regulatory functions of the core enhancer and its associated matrix attachment regions in the endogenous IgH locus, we have introduced targeted deletions of these elements, both individually and in combination, into an IgHa/b-heterozygous embryonic stem cell line. These embryonic stem cells were used to generate chimeric mice by recombination activating gene-2 (Rag-2)-deficient blastocyst complementation, and the effects of the introduced mutations were assayed in mutant B cells. We find that the core enhancer is necessary and sufficient to promote normal variable (V), diversity (D), and joining (J) segment recombination in developing B lineage cells and IgH locus transcription in mature B cells. Surprisingly, the 5' and 3' matrix attachment regions were dispensable for these processes.

publication date

  • February 16, 1999



  • Academic Article


Digital Object Identifier (DOI)

  • 10.1073/pnas.96.4.1526

PubMed ID

  • 9990057

Additional Document Info

start page

  • 1526

end page

  • 31


  • 96


  • 4