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- W2040215013 abstract "T cell receptor (TCR) variable region exons are assembled from germline V, (D), and J gene segments, each of which is flanked by recombination signal (RS) sequences that are composed of a conserved heptamer, a spacer of 12 or 23 bp, and a characteristic nonamer. V(D)J recombination only occurs between V, D, and J segments flanked by RS sequences that contain, respectively, 12(12-RS)- and 23(23-RS)-bp spacers (12/23 rule). Additional mechanisms can restrict joining of 12/23 RS matched segments beyond the 12/23 rule (B12/23). The TCRδ locus is contained within the TCRα locus; TCRα variable region exons are encoded by TRAV and TRAJ segments and those of TCRδ by TRDV, TRDD, and TRDJ segments. On the basis of the 12/23 rule, both TRAV and TRDV gene segments are compatible to rearrange with TRDD gene segments; however, TRAV-to-TRDD joins are not observed in vivo. Absence of TRAV-to-TRDD rearrangement might be explained either by B12/23 restriction or by differential accessibility of the TRDV versus TRAV gene segments for rearrangement to TRDD. We used in vitro substrate analysis to reveal that both TRAV and TRDV 23-RSs mediate rearrangements to the 5′TRDD1 12-RS, demonstrating that B12/23 restriction does not explain these rearrangement biases. However, targeted replacement of TRDD1 and its 12-RSs with TRAJ38 and its 12-RS showed that TRDV gene segments rearrange with the ectopic TRAJ38, whereas TRAV segments do not. Our results demonstrate that sorting of TRAV and TRDV gene segments is determined by differential locus accessibility during T cell development." @default.
- W2040215013 created "2016-06-24" @default.
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- W2040215013 date "2009-10-13" @default.
- W2040215013 modified "2023-10-14" @default.
- W2040215013 title "Differential utilization of T cell receptor TCRα/TCRδ locus variable region gene segments is mediated by accessibility" @default.
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- W2040215013 doi "https://doi.org/10.1073/pnas.0909723106" @default.
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