PMID: 8946476Oct 1, 1996Paper

Debrisoquine and S-mephenytoin hydroxylation phenotypes and genotypes in a Korean population

Pharmacogenetics
H K RohL Bertilsson

Abstract

One hundred and fifty-two healthy Korean volunteers were phenotyped with debrisoquine and mephenytoin and genotyped with respect to CYP2D6. The debrisoquine metabolic ratio (MR) varied between 0.09 and 6.3, and all subjects were thus classified as extensive metabolizers of debrisoquine. Polymerase chain reaction (PCR)-based amplification of genomic DNA with primers specific for the C188-->T mutation present in exon 1 of the CYP2D6*10B allele was performed and revealed an allele frequency of 0.51 in this Korean population. Forty-three subjects (28%) were homozygous for CYP2D6*10B, 69 subjects (45%) were heterozygous for this allele, while in 40 subjects (26%) no exon 1 mutation could be found. All subjects except one homozygous for the wild type allele had MRs below 0.75 whereas the MR was higher than 0.99 in all subjects homozygous for the CYP2D6*10B allele. The MRs in the three genotype groups were significantly different (p < 0.0001; Kruskal-Wallis test). Eco RI RFLP analysis of DNA from six subjects with debrisoquine MRs < or = 0.11 revealed that only one (MR 0.09) carried a duplicated CYP2D6*Z-gene (CYP2D6*2X2) as indicated by the Eco RI 12.1 kb haplotype. It is concluded that, as shown earlier for Chinese and Japanese popu...Continue Reading

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