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Assembly of TCRbeta variable region genes is ordered during thymocyte development with Dbeta to Jbeta rearrangement preceding Vbeta to DJbeta rearrangement. The 5'Dbeta 12-RSS is required to precisely and efficiently target Vbeta rearrangement beyond simply enforcing the 12/23 rule. By prohibiting direct Vbeta to Jbeta rearrangement, this restriction ensures Dbeta gene segment use in the assembly of essentially all TCRbeta variable region genes. In this study, we show that rearrangement of Vbeta 23-RSSs is significantly biased to the Dbeta 12-RSS over Jbeta 12-RSSs on extrachromosomal recombination substrates in nonlymphoid cells that express the recombinase-activating gene-1/2 proteins. These findings demonstrate that targeting of Vbeta to Dbeta rearrangement can be enforced by the V(D)J recombinase in the absence of lymphoid-specific factors other than the recombinase-activating gene-1/2 proteins.

the journal of immunology/the journal of immunology

Cutting Edge: Targeting of Vβ to Dβ Rearrangement by RSSs Can Be Mediated by the V(D)J Recombinase in the Absence of Additional Lymphoid-Specific Factors