CTCF-binding elements mediate control of V(D)J recombination.
Nature
; 477(7365): 424-30, 2011 Sep 11.
Article
em En
| MEDLINE
| ID: mdl-21909113
ABSTRACT
Immunoglobulin heavy chain (IgH) variable region exons are assembled from V(H), D and J(H) gene segments in developing B lymphocytes. Within the 2.7-megabase mouse Igh locus, V(D)J recombination is regulated to ensure specific and diverse antibody repertoires. Here we report in mice a key Igh V(D)J recombination regulatory region, termed intergenic control region 1 (IGCR1), which lies between the V(H) and D clusters. Functionally, IGCR1 uses CTCF looping/insulator factor-binding elements and, correspondingly, mediates Igh loops containing distant enhancers. IGCR1 promotes normal B-cell development and balances antibody repertoires by inhibiting transcription and rearrangement of D(H)-proximal V(H) gene segments and promoting rearrangement of distal V(H) segments. IGCR1 maintains ordered and lineage-specific V(H)(D)J(H) recombination by suppressing V(H) joining to D segments not joined to J(H) segments, and V(H) to DJ(H) joins in thymocytes, respectively. IGCR1 is also required for feedback regulation and allelic exclusion of proximal V(H)-to-DJ(H) recombination. Our studies elucidate a long-sought Igh V(D)J recombination control region and indicate a new role for the generally expressed CTCF protein.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Recombinação Genética
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Proteínas Repressoras
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Rearranjo Gênico de Cadeia Pesada de Linfócito B
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Sequências Reguladoras de Ácido Nucleico
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DNA Intergênico
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Éxons VDJ
Limite:
Animals
Idioma:
En
Revista:
Nature
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Estados Unidos