Regulation of T-cell receptor beta-chain gene assembly by recombination signals: the beyond 12/23 restriction

Immunological Reviews
Robert E TillmanB P Sleckman

Abstract

Assembly of antigen receptor genes is regulated in several important contexts during lymphocyte development. This regulation occurs through modulation of gene segment accessibility to the V(D)J recombinase and/or at the level of the recombination reaction due, in part, to constraints imposed by recombination signal (RS) sequences. RSs are composed of conserved heptamer and nonamer sequences that flank relatively non-conserved spacer sequences of either 12 or 23 base pairs. Recombination occurs only between RSs of dissimilar spacer lengths, a restriction known as the 12/23 rule. Recently, we have shown that RSs can impose significant constraints on antigen receptor gene assembly beyond enforcing the 12/23 rule. This restriction, termed B12/23, was revealed by analysis of T-cell receptor beta (TCRbeta) locus rearrangements, where Dbeta 12RSs and not Jbeta 12RSs are capable of efficiently targeting Vbeta 23RSs' rearrangement. The B12/23 restriction occurs at or prior to the DNA-cleavage step of the V(D)J recombination reaction, relies on features of the Dbeta 12RSs and Vbeta 23RSs, and is not absolutely dependent on lymphoid-specific factors other than the recombinase-activating gene-1 (RAG-1) and RAG-2 proteins. By preserving Dbe...Continue Reading

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Oct 5, 2010·Archivum Immunologiae Et Therapiae Experimentalis·Michael L SikesJustin M Bradshaw
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May 18, 2016·The Journal of Immunology : Official Journal of the American Association of Immunologists·Ellen Hsu
Oct 6, 2009·The Journal of Immunology : Official Journal of the American Association of Immunologists·Uzodinma N UcheNa Xiong

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