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Related Experiment Videos

Accessibility control of variable region gene assembly during T-cell development

B P Sleckman1, C H Bassing, C G Bardon

  • 1Howard Hughes Medical Institute, Children's Hospital, Boston, MA 02115, USA.

Immunological Reviews
|December 16, 1998
PubMed
Summary
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T-cell development involves precise gene assembly for T-cell antigen receptors (TCRs). This study investigates how accessibility of TCR gene loci is regulated during T-cell development to ensure proper receptor expression.

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • T-cell development requires ordered assembly and expression of T-cell antigen receptor (TCR) genes.
  • T cells differentiate into alpha beta or gamma delta lineages based on TCR expression.
  • TCR gene assembly involves site-specific recombination, tightly regulated during T-cell development.

Purpose of the Study:

  • To investigate the regulation of recombination and expression of TCR genes.
  • To analyze the role of cis-acting elements in TCR gene regulation.
  • To understand the regulation of TCR beta and TCR alpha/delta loci accessibility during T-cell development.

Main Methods:

  • Development of experimental approaches to assess cis-acting element roles.
  • Analysis of TCR gene recombination and expression.

Related Experiment Videos

  • Investigation of locus accessibility during T-cell development.
  • Main Results:

    • TCR beta, gamma, and delta variable region genes assemble before TCR alpha variable region genes.
    • TCR beta variable region gene assembly is regulated by allelic exclusion.
    • TCR alpha and delta variable region genes assemble at distinct developmental stages and express in separate T-cell lineages.

    Conclusions:

    • Regulation of TCR alpha/delta locus rearrangement and expression is complex.
    • Accessibility of TCR beta and TCR alpha/delta loci is a key regulatory mechanism in T-cell development.
    • Experimental approaches were established to study TCR gene regulation.