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Intrathymic delta selection events in gammadelta cell development

L Passoni1, E S Hoffman, S Kim

  • 1Department of Biology, Yale University, New Haven, Connecticut 06511, USA.

Immunity
|July 1, 1997
PubMed
Summary
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T cell receptor (TCR) delta selection guides gammadelta T cell development, differing from beta selection by involving the gamma chain and promoting differentiation over proliferation. This clarifies early T cell development and cell fate determination models.

Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • T cell receptor (TCR) delta locus rearrangements are crucial for gammadelta T cell development.
  • Delta selection occurs concurrently with TCR beta selection during thymocyte development.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of gammadelta T cell development.
  • To compare delta selection with beta selection in T cell development.
  • To understand the role of the gamma chain in delta selection.

Main Methods:

  • Analysis of T cell receptor (TCR) delta locus rearrangements.
  • Investigation of thymocyte development and selection processes.
  • Assessment of gammadelta T cell differentiation and proliferation.

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Main Results:

  • Delta selection primarily involves the gamma chain, suggesting no significant "preTgamma" chain.
  • Most gammadelta-selected thymocytes differentiate, unlike the proliferative response in alphabeta T cell development.
  • Some delta selection events promote thymocyte expansion, with variable gamma chain influence based on developmental age.

Conclusions:

  • Delta selection is a distinct process from beta selection, with unique characteristics regarding gamma chain involvement and cell fate outcomes.
  • The findings refine models of early T cell development and cell fate determination at the beta/delta selection stage.