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. 1987 Sep 1;166(3):761–775. doi: 10.1084/jem.166.3.761

Transient rearrangements of the T cell antigen receptor alpha locus in early thymocytes

PMCID: PMC2188689  PMID: 3040885

Abstract

The dull Ly-1 double-negative (Ly-1dull, Lyt-2-, L3T4-) subpopulation appears to be the major precursor group of T lymphocytes in the thymus. In examining the status of the alpha, beta, and gamma chain genes for T cell receptors (TCR) in this population of cells and hybridomas made from them, we find that all of these loci appear to begin DNA rearrangements in a nearly simultaneous fashion. In the case of the gamma genes, these involve V gamma----J gamma C gamma gene rearrangements; with the beta chain genes, both D beta----J beta C beta rearrangement and V beta----D beta J beta C beta rearrangements are evident; and in the case of the alpha locus, assayed in part by pulsed- field gel electrophoresis, they take the form of a novel series of rearrangements occurring 80 kb or more 5' to the C alpha gene. These alpha locus rearrangements are well away from any of the J alpha gene segments found in cDNA clones to date and are deleted in most mature thymocytes and functional T cell lines. Therefore they appear to represent a distinct class of rearrangement that occurs before V alpha-- --J alpha joining. These distinctions between the character of the TCR gene rearrangements in these cells represent useful markers in further distinguishing different stages of T cell differentiation within this compartment of early T cells. In addition, the unexpected discovery of clonal rearrangements so far away from any of the expressed J alpha gene segments, and at a stage where there is little or no stable C alpha RNA present, has interesting implications for the hierarchy of TCR gene expression.

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Selected References

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