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HLA-G gene polymorphism segregation within CEPH reference families
M Kirszenbaum1, S Djoulah, J Hors
1CEA-DRM-Service de Recherches en Hémato-Immunologie, Hôpital Saint Louis, Centre Hayem, Paris, France.
Human Immunology
|April 1, 1997
Summary
Human leukocyte antigen G (HLA-G) exhibits extensive genomic polymorphism, with seven new alleles identified. This genetic diversity is crucial for mother-fetus immune tolerance during pregnancy.
Area of Science:
- Immunogenetics
- Reproductive immunology
Background:
- Human leukocyte antigen G (HLA-G) is a nonclassical HLA class I antigen.
- It is expressed in human trophoblasts and is vital for maternal-fetal immune tolerance.
Purpose of the Study:
- To investigate the genomic polymorphism of HLA-G.
- To identify and characterize HLA-G alleles and their segregation patterns.
Main Methods:
- Polymerase chain reaction-single-strand conformation polymorphism (PCR-SSCP) analysis.
- Direct sequencing of HLA-G genes.
- Analysis within three CEPH reference families and six unrelated parents.
Main Results:
- Extensive genomic polymorphism was observed in HLA-G.
- Eight HLA-G alleles were identified in six unrelated parents, with seven being novel.
- Segregation of HLA-G alleles in offspring matched HLA class I haplotype segregation.
- Only one nonsynonymous mutation was found, indicating low molecular polymorphism.
Conclusions:
- HLA-G exhibits significant genomic polymorphism, contributing to its role in immune tolerance.
- The identified novel alleles expand the known diversity of HLA-G.
- Low molecular polymorphism suggests functional conservation of the HLA-G protein.