We have investigated the frequencies of HLA-B*44 alleles and their haplotyp
ic associations with HLA-A, -C, and -DRB1 loci in 450 healthy unrelated Kor
eans, including 213 parents from 107 families. All 79 samples (17.6%) typed
as B44 by serology were analyzed for B*44 alleles using polymerase chain r
eaction (I CR) single-strand conformation polymorphism (SSCP) method. A tot
al of three different B*44 alleles were detected: B*44031 (allele frequency
4.7%), B*44032 (3.1%), and B*4402 (1.3%). Three characteristic haplotypes
revealing strong linkage disequilibrium were A*3303-Cw*1403-B*44031-DRB1*13
02 (3.6%), A*3303-Cw*07-B*44032-DRB1*0701 and A*3201-Cw*05-B*4402-DRB1*0405
(0.4%). In addition, a strong association was observed for B*4402 with A*0
301. The B*4403-bearing haplotypes of Koreans appear to be relatively commo
n in Asian populations, whereas the B*4402-bearing haplotypes share some si
milarity to those of Caucasians. HLA-B44 alleles demonstrate a limited alle
lic diversity and comprise distinctive extended haplotypes in the Korean po
pulation. It is suggested that the frequencies of B44 subtype mismatches am
ong ABDRB1-matched unrelated donor-recipient pairs would be low in this pop
ulation. (C) American Society for Histocompatibility and Immunogenetics, 20
01. Published by Elsevier Science Inc.