title: MICA polymorphisms and haplotypes with HLA-B and HLA-DRB1 in Koreans.
abstract: Major histocompatibility complex (MHC) class I chain-related gene A (MICA) is located within the human MHC, centromeric to HLA-B and telomeric to HLA-DRB1. The location of MICA in the MHC indicates the presence of linkage disequilibrium with human leukocyte antigen (HLA). Like HLA, MICA is highly polymorphic; however, the information available for MICA polymorphisms is not as comprehensive as that for HLA polymorphisms. We estimated the allelic frequencies of MICA and haplotypes with HLA-B and HLA-DRB1 at high-resolution in a population of 139 unrelated Korean individuals by applying the newly developed method of sequence-based typing (SBT). A total of 17 MICA alleles were identified. The most frequent allele was MICA*010 (19.4%), followed by alleles *00201 (17.6%), *00801 (14.7%), *01201 (9.4%), *004 (8.3%) and *049 (7.9%). The most common two- and three-locus haplotypes were HLA-B*1501-MICA*010 (10.4%), MICA*010-HLA-DRB1*0406 (5.8%) and HLA-B*1501-MICA*010-HLA-DRB1*0406 (5.8%). This is the first study to provide such high-resolution information on the distribution of haplotypes comprising MICA, HLA-B and HLA-DRB1 in Korean individuals, a level of resolution made possible by use of the SBT method. The results of this study should help determine the mechanisms underlying diseases associated with MICA polymorphisms in Korean individuals.
authors.affiliation: Department of Laboratory Medicine, University of Ulsan College of Medicine and Asan Medical Center, Seoul, South Korea.
authors.forename: Y-H
authors.initials: YH
authors.lastname: Sohn
authors.forename: C-H
authors.initials: CH
authors.lastname: Cha
authors.forename: H-B
authors.initials: HB
authors.lastname: Oh
authors.forename: M H
authors.initials: MH
authors.lastname: Kim
authors.forename: S-E
authors.initials: SE
authors.lastname: Choi
authors.forename: O-J
authors.initials: OJ
authors.lastname: Kwon
mesh_terms: D044466:Asian People; D005787:Gene Frequency; D015235:HLA-B Antigens / Q000235:genetics*; D006684:HLA-DR Antigens / Q000235:genetics*; D059811:HLA-DRB1 Chains; D006239:Haplotypes; D015395:Histocompatibility Antigens Class I / Q000235:genetics*; D006801:Humans; D015810:Linkage Disequilibrium; D008285:Major Histocompatibility Complex / Q000235:genetics; D011110:Polymorphism, Genetic
chemical_list: D015235:HLA-B Antigens; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains; D015395:Histocompatibility Antigens Class I; C099187:MHC class I-related chain A