V(D)J recombination
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Introduction
Genes for lymphocyte antigen receptors are assembled from variable (V), diversity (D) & joining (J) gene segments. V(D)J recombination is initiated by RAG-1 protein & RAG-2 proteins which introduce DNA double strand breaks between the V, D & J segments & their flanking recombination signal sequences (RSSs). RSSs consist of conserved heptamer & nonamer motifs separated by a nonconserved spacer of 12 or 23 base pairs.
The DNA double strand breaks present two types of DNA end structures:
- hairpin sealed coding ends
- phosphorylated blunt signal ends
These ends are independently repaired by the non homologous end joining (NHEJ) pathway to form coding & signal joints respectively.
Additional terms
- V(D)J recombinase-1 (V(D)J recombination-activating protein-1, RING finger protein 74, RAG1)
- V(D)J recombinase-2 (V(D)J recombination-activating protein, RAG2)
References
- ↑ van Gent et al. Cell 85:107-13, 1996
- ↑ UniProt http://www.uniprot.org/uniprot/Q96SD1.html