Premium
Cytochrome P4502D6 (debrisoquine 4‐hydroxylase) and Parkinson's disease in Chinese and Caucasians
Author(s) -
Ho ShuLeong,
Kung Michelle H.W.,
Li Leonard S.W.,
Lauder Ian J.,
Ramsden David B.
Publication year - 1999
Publication title -
european journal of neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.881
H-Index - 124
eISSN - 1468-1331
pISSN - 1351-5101
DOI - 10.1046/j.1468-1331.1999.630323.x
Subject(s) - haplotype , genetics , debrisoquine , allele , genotype , cyp2d6 , medicine , population , biology , endocrinology , gene , environmental health
Four polymorphic sites (C/T 188 C/T 2938 , G/C 4268 , G/A 1934 ) in the cytochrome P4502D6 (debrisoquine 4‐hydroxylase) gene were investigated for their association with sporadic Parkinson's disease (PD). Three mutant allels (C/T 188 , C/T 2938 and G/C 4268 ) result in amino acid changes which could alter the substrate specificity or alter its ability to metabolize their substrates; the fourth (G/A 1934 ) causes a loss of enzyme activity. The study was carried out in two ethnically homogenous populations: Chinese (123 PD patients, 124 controls); and Caucasian (95 PD patients, 62 controls). Haplotype status, which took into account amino acid changes at three polymorphic sites, was deduced from genotyping results in order to investigate whether substrate specificity was important rather than loss of enzyme activity. There was no gender difference in the distribution of the alleles in either race. There was, however, significant association among the three polymorphic sites (C/T 188 , C/T 2938 , C/C 4268 ) in both ethnic groups. T/T 188 :C/C 2938 :C/C 4268 is the most common genotype in the Chinese population, in contrast to C/C 188 :C/T 2938 :C/G 4268 (followed by C/C 188 :C/C 2938 :G/G 4268 ) in Caucasians. All 69 of the sub‐group of Chinese patients tested were homozygous for the wild‐type allele at the G/A 1934 polymorphic site. Neither the CYP2D6 allele nor haplotype was associated with PD in either ethnic group.