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Genetic polymorphism of the hepatic cytochrome P450 2C19 in North Indian subjects
Author(s) -
Lamba Jatinder K.,
Dhiman Radha K.,
Kohli Krishan K.
Publication year - 1998
Publication title -
clinical pharmacology and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.941
H-Index - 188
eISSN - 1532-6535
pISSN - 0009-9236
DOI - 10.1016/s0009-9236(98)90037-6
Subject(s) - cyp2c19 , omeprazole , confidence interval , volunteer , hydroxylation , allele , medicine , urine , pharmacology , gastroenterology , cytochrome p450 , biology , genetics , metabolism , biochemistry , gene , agronomy , enzyme
One hundred unrelated healthy North Indian subjects were phenotyped with respect to their ability to metabolize omeprazole to 5‐hydroxyomeprazole. Each volunteer was requested to ingest 20 mg (57.9 μmol) omeprazole. Urine was collected for a period of 8 hours and the amount of 5‐hydroxyomeprazole excreted was estimated by HPLC. Histogram, probit, and normal test variable plots showed the antimode value for the log hydroxylation index of omeprazole to be 1.7. Of 100 North Indian subjects, 11 demonstrated log hydroxylation index values more than 1.7. Thus it is inferred that the frequency of occurrence of poor metabolizers of omeprazole in North Indian subjects is 11% (95% confidence interval, 5% to 17%). From the Hardy‐Weinberg Law it was computed that the frequency of occurrence of the mutant allele of hepatic CYP2C19 in the North Indian subjects was 0.33. Clinical Pharmacology & Therapeutics (1998) 63 , 422–427; doi: