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CD3 delta immunodeficiency.

Chaim M Roifman1

  • 1Division of Immunology and Allergy, and Program of Infection, Immunity, Injury and Repair, The Hospital for Sick Children and The University of Toronto, Ontario M5G 1X8, Canada. chaim.roifman@sickkids.ca

Current Opinion in Allergy and Clinical Immunology
|January 11, 2005
PubMed
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CD3 delta deficiency in humans causes severe immunodeficiency due to impaired T-cell development. This contrasts with murine models, highlighting CD3 delta

Area of Science:

  • Immunology
  • Genetics
  • Cell Biology

Background:

  • The CD3 complex is crucial for T-cell receptor signaling and T-cell development.
  • Understanding the specific roles of CD3 subunits, like CD3 delta, is vital for diagnosing and treating immunodeficiencies.

Purpose of the Study:

  • To review advances in understanding the CD3 delta subunit's role in human T-cell development.
  • To compare CD3 delta deficiency with other CD3 subunit deficiencies and animal models.

Main Methods:

  • Analysis of a human immunodeficiency case with CD3 delta deficiency.
  • Comparison of patients' and normal thymocytes using mass gene screening and microarray techniques.
  • Comparative analysis with existing data on CD3 gamma/epsilon deficiencies and murine models.

Related Experiment Videos

Main Results:

  • CD3 delta deficiency, caused by a mutation in the extracellular domain, leads to profound T-cell depletion and severe viral infections in infants.
  • Absence of CD3 delta arrests thymocyte development at the double negative to double positive transition.
  • Human CD3 delta appears more critical for both alpha beta and gamma delta T-cell development than its murine counterpart.

Conclusions:

  • Human CD3 delta deficiency results in a more severe immunodeficiency than CD3 gamma or epsilon deficiencies.
  • Allogeneic bone marrow transplantation effectively treated the immunodeficiency.
  • Microarray technology is a valuable tool for discovering the genetic basis of inherited disorders.