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MIC-A polymorphism in Japanese and a MIC-A-MIC-B null haplotype
M Komatsu-Wakui1, K Tokunaga, Y Ishikawa
1Department of Human Genetics, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan.
Immunogenetics
|June 17, 1999
Summary
Researchers analyzed the polymorphic MIC-A gene in Japanese individuals, identifying eight alleles and a novel MIC-AMW variant. Strong linkage disequilibrium was observed between MIC-A and HLA-B, with a null haplotype identified.
Area of Science:
- Immunogenetics
- Molecular Anthropology
Background:
- The MIC-A gene, part of the MIC family, is located within the major histocompatibility complex (MHC) and expressed in epithelial and intestinal cells.
- MIC-A and MIC-B molecules are involved in Vdelta1 gamma delta T cell recognition.
Purpose of the Study:
- To analyze the polymorphic exons 2, 3, and 4 of the MIC-A gene.
- To identify MIC-A alleles and their association with HLA-B in the Japanese population.
Main Methods:
- Polymerase chain reaction-single-strand conformation polymorphism (PCR-SSCP) was used to analyze polymorphic exons of the MIC-A gene.
- Genotyping was performed on 114 healthy Japanese subjects.
Main Results:
- Five, six, and four patterns were observed in MIC-A exons 2, 3, and 4, respectively.
- Eight MIC-A alleles were identified, including a novel allele designated MIC-AMW.
- Strong linkage disequilibrium was found between MIC-A and HLA-B loci, with specific MIC-A alleles associating with particular HLA-B groups. A MIC-A-MIC-B null haplotype associated with HLA-B*4801 was identified, involving a large deletion and a stop codon in MIC-B.
Conclusions:
- The study characterizes MIC-A polymorphism in Japanese individuals and reveals significant linkage disequilibrium with HLA-B.
- The identification of a null haplotype highlights potential implications for immune responses and genetic studies.