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. 1994 Jan 1;179(1):43–55. doi: 10.1084/jem.179.1.43

Enhancer-dependent and -independent steps in the rearrangement of a human T cell receptor delta transgene

PMCID: PMC2191330  PMID: 8270882

Abstract

The rearrangement and expression of T cell receptor (TCR) gene segments occurs in a highly ordered fashion during thymic ontogeny of T lymphocytes. To study the regulation of gene rearrangement within the TCR alpha/delta locus, we generated transgenic mice that carry a germline human TCR delta minilocus that includes V delta 1, V delta 2, D delta 3, J delta 1, J delta 3, and C delta segments, and either contains or lacks the TCR delta enhancer. We found that the enhancer- positive construct rearranges stepwise, first V to D, and then V-D to J. Construct V-D rearrangement mimics a unique property of the endogenous TCR delta locus. V-D-J rearrangement is T cell specific, but is equivalent in alpha/beta and gamma/delta T lymphocytes. Thus, either there is no commitment to the alpha/beta and gamma/delta T cell lineages before TCR delta gene rearrangement, or if precommitment occurs, it does not operate directly on TCR delta gene cis-acting regulatory elements to control TCR delta gene rearrangement. Enhancer- negative mice display normal V to D rearrangement, but not V-D to J rearrangement. Thus, the V-D to J step is controlled by the enhancer, but the V to D step is controlled by separate elements. The enhancer apparently controls access to J delta 1 but not D delta 3, suggesting that a boundary between two independently regulated domains of the minilocus lies between these elements. Within the endogenous TCR alpha/delta locus, this boundary may represent the 5' end of a chromatin regulatory domain that is opened by the TCR delta enhancer during T cell development. The position of this boundary may explain the unique propensity of the TCR delta locus to undergo early V to D rearrangement. Our results indicate that the TCR delta enhancer performs a crucial targeting function to regulate TCR delta gene rearrangement during T cell development.

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Selected References

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