Allelic and Haplotypic Diversity of HLA-A, -B, -C, and -DRB1 Genes in Koreans Defined by High-resolution DNA Typing
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Background : In this study, we used high-resolution DNA typing to investigate the distribution of HLA alleles and haplotypes in Koreans. Methods : HLA-A, -B, -C, and -DRB1 alleles were genotyped at the allelic (4-digit) level in 474 healthy Koreans. HLA genotyping was performed in two steps. Initially, serologic typing or genericlevel DNA typing was performed using the PCR-sequence-specific oligonucleotide method, and then allelic DNA typing (exons 2 and 3 for class I, and exon 2 for DRB1) was carried out using the PCR-single-strand conformation polymorphism method or sequence-based typing. HLA allele and haplotype frequencies and linkage disequilibrium values were calculated by the maximum likelihood method using a computer program developed for the 11th International Histocompatibility Workshop. Results : A total of 21 HLA-A, 40 HLA-B, 22 HLA-C, and 29 HLA-DRB1 alleles were found in Koreans. The most frequent alleles in each locus with frequencies of ≥10% were, in decreasing order of frequency, as follows: A*24:02, A*02:01, A*33:03; B*51:01; C*01:02, C*03:03; and DRB1*09:01. The numbers of two- and three-locus haplotypes with frequencies of >0.5% were as follows: 44 A-C, 42 B-C, 51 A-B, 52 B-DRB1, 42 A-C-B, and 34 A-B-DRB1. Thirteen A-B-DRB1 haplotypes with frequencies of ≥1.0% comprised 26.0% of the total haplotypes. The six most common haplotypes were as follows: A*33:03-B*44:03-DRB1*13:02 (3.7%), A*33:03-B*44:03-DRB1*07:01 (3.0%), A*33:03-B*58: 01-DRB1*13:02 (3.0%), A*24:02-B*07:02-DRB1*01:01 (2.8%), A*30:01-B*13:02-DRB1*07:01 (2.3%), and A*11:01-B*15:01-DRB1*04:06 (2.2%). Conclusions : The information obtained in this study can be used as basic data for Koreans in the fields of organ transplantation, disease association, and anthropologic studies. (Korean J Lab Med 2010;30:685-96)
Abstract
Background : In this study, we used high-resolution DNA typing to investigate the distribution of HLA alleles and haplotypes in Koreans. Methods : HLA-A, -B, -C, and -DRB1 alleles were genotyped at the allelic (4-digit) level in 474 healthy Koreans. HLA genotyping was performed in two steps. Initially, serologic typing or genericlevel DNA typing was performed using the PCR-sequence-specific oligonucleotide method, and then allelic DNA typing (exons 2 and 3 for class I, and exon 2 for DRB1) was carried out using the PCR-single-strand conformation polymorphism method or sequence-based typing. HLA allele and haplotype frequencies and linkage disequilibrium values were calculated by the maximum likelihood method using a computer program developed for the 11th International Histocompatibility Workshop. Results : A total of 21 HLA-A, 40 HLA-B, 22 HLA-C, and 29 HLA-DRB1 alleles were found in Koreans. The most frequent alleles in each locus with frequencies of ≥10% were, in decreasing order of frequency, as follows: A*24:02, A*02:01, A*33:03; B*51:01; C*01:02, C*03:03; and DRB1*09:01. The numbers of two- and three-locus haplotypes with frequencies of >0.5% were as follows: 44 A-C, 42 B-C, 51 A-B, 52 B-DRB1, 42 A-C-B, and 34 A-B-DRB1. Thirteen A-B-DRB1 haplotypes with frequencies of ≥1.0% comprised 26.0% of the total haplotypes. The six most common haplotypes were as follows: A*33:03-B*44:03-DRB1*13:02 (3.7%), A*33:03-B*44:03-DRB1*07:01 (3.0%), A*33:03-B*58: 01-DRB1*13:02 (3.0%), A*24:02-B*07:02-DRB1*01:01 (2.8%), A*30:01-B*13:02-DRB1*07:01 (2.3%), and A*11:01-B*15:01-DRB1*04:06 (2.2%). Conclusions : The information obtained in this study can be used as basic data for Koreans in the fields of organ transplantation, disease association, and anthropologic studies. (Korean J Lab Med 2010;30:685-96)
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