The DNA-Binding Protein CTCF Limits Proximal V[kappa] Recombination and Restricts [kappa] Enhancer Interactions to the Immunoglobulin [kappa] Light Chain Locus

• Published in: Immunity (Cambridge, Mass.) Mass.), 2011-10, Vol.35 (4), p.501
• Main Authors: Ribeiro de Almeida, Claudia, Stadhouders, Ralph, de Bruijn, Marjolein JW, Bergen, Ingrid M, Thongjuea, Supat, Lenhard, Boris, van IJcken, Wilfred, Grosveld, Frank, Galjart, Niels, Soler, Eric, Hendriks, Rudi W
• Format: Article
• Language: English
• Subjects: Bone marrow; Cytokines; Deoxyribonucleic acid; DNA; Gene expression; Software; Transcription factors
• ISSN: 1074-7613; 1097-4180
• DOI: 10.1016/j.immuni.2011.07.014

Regulation of immunoglobulin (Ig) V(D)J gene rearrangement is dependent on higher-order chromatin organization. Here, we studied the in vivo function of the DNA-binding zinc-finger protein CTCF, which regulates interactions between enhancers and promoters. By conditional deletion of theCtcfgene in the B cell lineage, we demonstrate that loss of CTCF allowed Ig heavy chain recombination, but pre-B cell proliferation and differentiation was severely impaired. In the absence of CTCF, the Igκ light chain locus showed increased proximal and reduced distal Vκ usage. This was associated with enhanced proximal Vκ and reduced Jκ germline transcription. Chromosome conformation capture experiments demonstrated that CTCF limits interactions of the Igκ enhancers with the proximal Vκgene region and prevents inappropriate interactions between these strong enhancers and elements outside the Igκ locus. Thus, although Ig gene recombination can occur in the absence of CTCF, it is a critical factor determining Vκ segment choice for recombination.