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Related Experiment Videos

Polymorphism of human CD1 genes.

M Han1, L I Hannick, M DiBrino

  • 1Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, Twinbrook II Facility, National Institutes of Health, Rockville, MD 20852, USA.

Tissue Antigens
|September 17, 1999
PubMed
Summary
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Human CD1 genes, crucial for presenting lipid antigens, show significant genetic diversity. This polymorphism, particularly in CD1a and CD1e, may affect antigen binding and immune interactions.

Area of Science:

  • Immunogenetics
  • Molecular immunology
  • Human genetics

Background:

  • Human CD1 genes were previously thought to be invariant or exhibit limited polymorphism.
  • CD1 antigens are increasingly recognized for their role in presenting lipid and glycolipid antigens.

Purpose of the Study:

  • To conduct a comprehensive genetic polymorphism survey of the five human CD1 genes (CD1a-CD1e).
  • To investigate the functional implications of observed genetic variations in CD1 antigens.

Main Methods:

  • Utilized polymerase chain reaction-single stranded conformational polymorphism (PCR-SSCP) for genetic analysis.
  • Performed sequence analyses on exons 2 and 3 of CD1a-CD1e genes.
  • Characterized genetic variations in a cohort of 110 unrelated healthy donors.

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Main Results:

  • All five human CD1 genes (CD1a-CD1e) demonstrated polymorphism in exon 2.
  • Substitutions in CD1a, CD1d, and CD1e resulted in amino acid replacements, unlike silent substitutions in CD1b and CD1c.
  • Polymorphisms in CD1a and CD1e were found to be prevalent in the population.
  • Specific CD1a substitutions may influence interactions with beta2-microglobulin (β2m) or accessory molecules.
  • CD1e substitutions are located in the predicted ligand-binding region, potentially affecting antigen binding.

Conclusions:

  • Human CD1 genes exhibit significant genetic polymorphism, challenging previous assumptions of invariance.
  • Polymorphisms in CD1a and CD1e are common and may have functional consequences for immune responses.
  • Variations in CD1a and CD1e may modulate their interactions with other molecules and their ability to bind lipid antigens, impacting T cell recognition.