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HLA-A9 antibodies and epitopes

H Fussell1, M Thomas, J Street

  • 1Regional Tissue Typing Laboratory, National Blood Transfusion Service (Wales), Cardiff, United Kingdom.

Tissue Antigens
|April 1, 1996
PubMed
Summary

Fifty pregnancy alloantisera were used to differentiate HLA-A9 specificities. This study defined five antibody specificities and identified nine serologically definable epitopes within the HLA-A9 antigen family.

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Area of Science:

  • Immunogenetics
  • Serology
  • Molecular Biology

Background:

  • Human Leukocyte Antigen (HLA) complex plays a crucial role in immune response.
  • HLA-A9 specificities (A23, A24, A2403) are important in transplantation and disease association.
  • Pregnancy alloantisera are valuable tools for HLA antibody identification.

Purpose of the Study:

  • To serologically differentiate three sequenced HLA-A9 specificities using pregnancy alloantisera.
  • To define antibody specificities and predict corresponding epitopes based on HLA amino acid sequences.
  • To characterize the serologically definable epitopes within the HLA-A9 antigen family.

Main Methods:

  • Serological titration studies using 50 pregnancy alloantisera against HLA-A23, A24, and A2403.
  • Analysis of antiserum reaction patterns and cytotoxicity scores to define antibody specificities.
  • Inspection of amino acid sequences of 136 HLA-A, B, and C molecules to predict epitopes.

Main Results:

  • Antiserum reaction patterns allowed easy differentiation of the three HLA-A9 specificities into five categories.
  • Five possible antibody specificities were defined: anti-A23, -A24, -A23/24, -A24/2403, and anti-A23/24/2403.
  • Prediction of five unique epitopes, one unique to A2403, and confirmation of a shared epitope between A1 and A24, suggesting a minimum of nine serologically definable epitopes for HLA-A9.

Conclusions:

  • Pregnancy alloantisera are effective in differentiating HLA-A9 specificities.
  • The study identified and characterized multiple serologically defined epitopes within the HLA-A9 antigen family.
  • This detailed epitope mapping contributes to a better understanding of HLA polymorphism and antibody recognition.

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