title: S-mephenytoin hydroxylation phenotype and CYP2C19 genotype among Ethiopians.
abstract: The polymorphic metabolism of S-mephenytoin and the distribution of two known deleterious mutant CYP2C19 alleles was determined among 114 healthy unrelated black Ethiopians. Six subjects (5.2%) were poor metabolizers (PMs) of S-mephenytoin. The frequencies of the defective CYP2C19*2 (CYP2C19m1) and CYP2C19*3 (CYP2C19m2) alleles were 0.14 and 0.02, respectively. Three of the PMs were homozygous for the CYP2C19*2 allele and the remaining three PMs were heterozygous for both the CYP2C19*2 and CYP2C19*3 mutant alleles. It is concluded that the frequency of PMs for S-mephenytoin is similar in Ethiopians, Zimbabweans and Caucasians and that the CYP2C19*3 allele, for the first time identified in a black population, together with the CYP2C19*2 allele account for all of the defective CYP2C19 alleles among the Ethiopian PMs.
authors.affiliation: Faculty of medicine, Addis Ababa University, Ethiopia.
authors.forename: I
authors.initials: I
authors.lastname: Persson
authors.forename: E
authors.initials: E
authors.lastname: Aklillu
authors.forename: F
authors.initials: F
authors.lastname: Rodrigues
authors.forename: L
authors.initials: L
authors.lastname: Bertilsson
authors.forename: M
authors.initials: M
authors.lastname: Ingelman-Sundberg
mesh_terms: D000483:Alleles; D001189:Aryl Hydrocarbon Hydroxylases; D065731:Cytochrome P-450 CYP2C19; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics* / Q000378:metabolism; D005002:Ethiopia; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D008297:Male; D008617:Mephenytoin / Q000378:metabolism*; D006899:Mixed Function Oxygenases / Q000235:genetics* / Q000378:metabolism; D010641:Phenotype; D011110:Polymorphism, Genetic
chemical_list: D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D001189:Aryl Hydrocarbon Hydroxylases; C045793:CYP2C19 protein, human; D065731:Cytochrome P-450 CYP2C19; D008617:Mephenytoin