title: CYP2D6 polymorphism and the presence of anti-LKM-1 in patients with chronic hepatitis C.
abstract: Anti-LKM-1 autoantibodies are directed mostly at cytochrome P450 2D6 (CYP2D6) autoantigen, whose activity ranges from "complete deficiency" to "extensive metabolism" due to genetic polymorphism. We aimed to find any relevance of CYP2D6 alleles to the presence/absence of anti-LKM-1 in Japanese patients with chronic hepatitis C. The frequency of an extensive metabolizer-type allele (CYP2D6*1) in anti-LKM-1-positive patients was higher than that in anti-LKM-1-negative patients (0.800 vs 0.431; P = 0.0035), while the CYP2D6*10 allele with moderately reduced activity was less frequent in the former than the latter (0.050 vs 0.389; P = 0.0069). Moreover, the rate of homozygosity for CYP2D6*1 showed a striking difference between the two groups (70% vs 19%; P = 0.0021). These findings suggest that a genetic predisposition to produce the enzyme CYP2D6 of extensive metabolizer-type is associated with the induction of anti-LKM-1 in chronic hepatitis C patients.
authors.affiliation: Department of Medical Sciences, Department of Gastroenterology, Toshiba General Hospital, Shinagawa-ku, Tokyo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hijikata
authors.forename: H
authors.initials: H
authors.lastname: Miyakawa
authors.forename: M
authors.initials: M
authors.lastname: Matsushita
authors.forename: M
authors.initials: M
authors.lastname: Kako
authors.forename: Y
authors.initials: Y
authors.lastname: Ohta
authors.forename: S
authors.initials: S
authors.lastname: Mishiro
mesh_terms: D000483:Alleles; D001323:Autoantibodies / Q000097:blood*; D019389:Cytochrome P-450 CYP2D6 / Q000235:genetics* / Q000276:immunology; D005260:Female; D005787:Gene Frequency; D019698:Hepatitis C, Chronic / Q000201:enzymology* / Q000235:genetics* / Q000276:immunology; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic
chemical_list: D001323:Autoantibodies; C060729:anti-liver kidney microsome antibody; D019389:Cytochrome P-450 CYP2D6