Allelic exclusion of mouse T cell receptor alpha chains occurs at the time of thymocyte TCR up-regulation.


Journal Article

We report a detailed analysis of TCR V alpha and V beta chain expression on immature versus mature thymocytes of normal, TCR beta-transgenic, and TCR alpha-hemizygous mice. Chain pairing between TCR V alpha and V beta chains is random on immature thymocytes, but individual chain pairs are selected in mature thymocytes. This indicates that V alpha-V beta chain pairing preferences are determined during thymic selection, and not as a result of structural constraints. Dual V alpha chain expression is found frequently on immature, but not mature thymocytes. It is not found in TCR alpha-hemizygous mice, showing that cell surface expression of dual alpha chains is caused by lack of allelic exclusion in immature thymocytes. Down-regulation of one of the alpha chains occurs concurrently with differentiation from TCRlo, CD69- to TCRhi, CD69+ phenotype, suggesting that it is associated with positive selection of the functional TCR.

Full Text

Duke Authors

Cited Authors

  • Alam, SM; Crispe, IN; Gascoigne, NR

Published Date

  • October 1995

Published In

Volume / Issue

  • 3 / 4

Start / End Page

  • 449 - 458

PubMed ID

  • 7584136

Pubmed Central ID

  • 7584136

International Standard Serial Number (ISSN)

  • 1074-7613

Digital Object Identifier (DOI)

  • 10.1016/1074-7613(95)90174-4


  • eng

Conference Location

  • United States