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HLA-G gene polymorphism in a Japanese population
T Yamashita1, T Fujii, Y Watanabe
1Department of Obstetrics and Gynecology, Faculty of Medicine, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan.
Immunogenetics
|January 1, 1996
Summary
This study investigated Human Leukocyte Antigen-G (HLA-G) gene polymorphism in Japanese individuals using molecular techniques. Researchers identified novel HLA-G alleles and their frequencies, revealing associations with other HLA genes.
Area of Science:
- Immunogenetics
- Human Leukocyte Antigen (HLA) research
- Population genetics
Background:
- The Human Leukocyte Antigen-G (HLA-G) gene plays a crucial role in immune tolerance, particularly in pregnancy and transplantation.
- Understanding HLA-G gene polymorphism is essential for assessing its impact on immune responses and disease susceptibility in different populations.
Purpose of the Study:
- To characterize the polymorphism of the HLA-G gene within a Japanese population.
- To identify novel HLA-G alleles and determine their frequencies.
- To investigate potential associations between HLA-G alleles and other HLA genes (HLA-A, -B, -DRB1).
Main Methods:
- Utilized polymerase chain reaction (PCR)-single-strand conformation polymorphism (SSCP) analysis.
- Employed PCR sequence-specific oligonucleotide (SSO) analysis.
- Performed DNA direct sequencing to analyze nucleotide variations in exons 2, 3, and 4 of the HLA-G gene.
Main Results:
- Identified nine single-base substitutions in the HLA-G gene compared to the G*01011 sequence, including one non-synonymous substitution leading to an amino acid change.
- Discovered four distinct HLA-G alleles, provisionally named GJ1, GJ2, GJ3, and GJ4, with estimated frequencies of 0.33, 0.16, 0.45, and 0.06, respectively.
- Designated a newly observed allele as G*0104 and found strong positive associations between HLA-G alleles and HLA-A, -B, or -DRB1 alleles.
Conclusions:
- The study successfully characterized HLA-G gene polymorphism in the Japanese population, identifying a new allele (G*0104).
- The findings highlight significant associations between HLA-G alleles and other HLA loci, suggesting a complex genetic interplay.
- This detailed genetic information on HLA-G in Japanese individuals contributes to a better understanding of its role in immune regulation and potential disease associations.