Related Experiment Videos
Epitopes within the HLA-B5,B35 cross-reacting group
F E Ward1, A D Stewart, R E Ruiz
1Department of Microbiology and Immunology, Duke University Medical Center, Durham, North Carolina 27710.
Human Immunology
|November 1, 1989
Summary
The HLA-B5,B35 antigen family exhibits complex serological reactions due to shared epitopes. This study models the evolution of this group, revealing distinct epitope combinations in HLA-B5,B35 gene products.
Area of Science:
- Immunogenetics
- Molecular immunology
Background:
- The HLA-B5,B35 cross-reacting group is a complex family of human leukocyte antigens.
- Its genetic, protein, and molecular bases, along with its polymorphism, remain incompletely understood.
- Previous research faced challenges in resolving the roles of shared amino acid sequences, multiple epitopes, and potential HLA-C antigen involvement.
Purpose of the Study:
- To investigate the structural and evolutionary basis of the HLA-B5,B35 cross-reacting group.
- To characterize the distinct epitopes present on HLA-B5,B35 gene products.
Main Methods:
- Serological analysis of over 900 antibodies against lymphocytes from 92 individuals of diverse ethnic backgrounds.
- Utilizing data from the Tenth International Workshop, Third Asia-Oceanic Workshop, and local reagents.
- Applying principles of maximum parsimony to construct an evolutionary model.
Main Results:
- Demonstrated that HLA-B5,B35 gene products share varying combinations of distinct epitopes.
- Identified specific epitope profiles across different ethnic groups.
- Developed a model for the evolutionary diversification of the HLA-B5,B35 cross-reacting group.
Conclusions:
- The complexity of the HLA-B5,B35 cross-reacting group arises from distinct epitope combinations on its gene products.
- A parsimony-based model provides insights into the evolutionary pathways of this antigen family.
- Further understanding of HLA antigen diversity is crucial for immunogenetic research.