CYP2D6 and CYP2C19 genotypes in an elderly Swedish population.
OBJECTIVE
Eighty-three healthy elderly Swedish subjects (age 87 +/- 4 years, mean +/- SD, range 80-98 years) were genotyped with respect to the two genetic polymorphisms of oxidative drug metabolism, CYP2D6 and CYP2C19, using allele-specific polymerase chain reaction (PCR). A control population consisted of 248 younger unrelated healthy volunteers (age 31 +/- 9 years, range 19-63 years) for CYP2D6, and 162 (age 30 +/- 8 years, range 19-55 years) for CYP2C19.


RESULTS
No significant differences were found between the control groups and the elderly subjects with respect to the frequencies of the defect alleles CYP2D6*3, CYP2D6*4, CYP2C19*2 and CYP2C19*3. Neither were there any differences in the genotype frequencies, or the predicted phenotype frequencies. The study indicates that the CYP2D6 and CYP2C19 genotypes play no major role in the probability of reaching high age.


CONCLUSIONS
No genetically determined differences in the pharmacokinetics of drugs metabolized by these two polymorphic enzymes are to be expected in the oldest age groups compared with younger adults.
Yamada
H
H
Department of Medical Laboratory Sciences and Technology Huddinge University Hospital, Sweden.
Dahl
M L
ML
Lannfelt
L
L
Viitanen
M
M
Winblad
B
B
Sjöqvist
F
F
D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001189:Aryl Hydrocarbon Hydroxylases; D016022:Case-Control Studies; D065731:Cytochrome P-450 CYP2C19; D019389:Cytochrome P-450 CYP2D6 / Q000235:genetics*; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D003704:Dementia / Q000201:enzymology* / Q000235:genetics; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D006899:Mixed Function Oxygenases / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012016:Reference Values; D013548:Sweden
D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D001189:Aryl Hydrocarbon Hydroxylases; C045793:CYP2C19 protein, human; D065731:Cytochrome P-450 CYP2C19; D019389:Cytochrome P-450 CYP2D6