Population study of allelic diversity in the human MHC class I-related MIC-A gene

被引:112
作者
Petersdorf, EW [1 ]
Shuler, KB [1 ]
Longton, GM [1 ]
Spies, T [1 ]
Hansen, JA [1 ]
机构
[1] Fred Hutchinson Canc Res Ctr, Seattle, WA 98109 USA
关键词
MIC-A gene; allelic diversity; allelic frequencies; HLA-B; linkage disequilibrium;
D O I
10.1007/s002510050655
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
The polymorphism of major histocompatibility complex (MHC) class I HLA-A, -B, and -C molecules may have evolved through pathogen-driven selection of alleles with diverse peptide-binding specificities. Two MHC-encoded molecules that are distantly related to class I, MIG-A and MIC-B, do not function in the presentation of pathogen-derived peptides to T cells with alpha beta T-cell receptors (TCRs), but are broadly recognized by intraepithelial T cells with gamma delta TCRs. However, both MIG-A and MIC-B are polymorphic, displaying an unusual distribution of a number of variant amino acids in their extracellular alpha 1, alpha 2, and alpha 3 domains. In order to further define the polymorphism of MIG-A, we examined its alleles among 275 individuals with common and rare HLA genotypes. Of 16 previously defined alleles, 12 were confirmed and 5 new alleles were identified. A two-by-two analysis of MIG-A and HLA-B alleles uncovered a number of statistically significant associations. These results confirm and extend previous knowledge on the polymorphism of MIG-A. The strong positive linkage of certain MIG-A and HLA-B alleles may have implications for studies related to MHC-associated diseases and transplantation.
引用
收藏
页码:605 / 612
页数:8
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