title: Additional sequence analysis outside exon 2 clarifies DRB1*12 and DRB1*14 allelic frequencies in Koreans.
abstract: Polymorphisms outside exon 2 of the DRB1 coding region exhibit increased ambiguities in allele assignments in typing laboratories analyzing the exon 2 sequence alone. This study investigated the frequencies of alleles in DRB1*120101/1206/1210 and DRB1*140101/1454 groups by DNA sequencing of exons 1 and/or 3 and examined their associations with class II alleles at adjacent loci in Koreans. Of 103 individuals, 97 were DRB1*120101 and 6 were DRB1*1210. None carried DRB1*1206, an allele initially characterized from a Korean individual. Association of DRB1*120101 with various DRB3, DQA1, and DQB1 alleles was reflected in 11 different four-locus haplotypes. In contrast, DRB1*1210 was exclusively associated with DRB3*020201, DQA1*0505, and DQB1*0301. All 97 DRB1*140101/1454 samples were DRB1*1454. DRB1*1454 was strongly associated with DRB3*020201, DQA1*010401, and two different DQB1 alleles (*0502, *0503). Continuous updating of HLA high-resolution typing information will be useful in the development of typing and matching strategies for hematopoietic stem cell transplantation.
authors.affiliation: Hallym Institution for Genome Application, Hallym University Sacred Heart Hospital, Anyang, Korea. leekw@hallym.or.kr
authors.forename: Kyung Wha
authors.initials: KW
authors.lastname: Lee
authors.forename: Young-A
authors.initials: YA
authors.lastname: Jung
mesh_terms: D000483:Alleles; D044466:Asian People; D005091:Exons; D005787:Gene Frequency; D006684:HLA-DR Antigens / Q000235:genetics*; D059811:HLA-DRB1 Chains; D006801:Humans; D020641:Polymorphism, Single Nucleotide
chemical_list: D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains