High incidence of ADH2*1/ALDH2*1 genes among Japanese alcohol dependents and patients with alcoholic liver disease

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
F TanakaM Omata

Abstract

In an attempt to clarify the genetic factors in alcoholism among the Japanese, polymorphism of alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) genes has been investigated. Genetic polymorphism of ADH2/ALDH2 in 66 cases of normal subjects, 90 cases of alcohol dependent, and 31 patients with alcoholic liver disease among Japanese has been analyzed using a polymerase chain reaction assay followed by a direct sequencing method, because ethanol is mainly catabolized by ADH and ALDH and less by cytochrome P450IIE1 and catalase. The incidence of both ADH2*1/*1 and ALDH2*1/*1 was significantly higher in patients with alcohol dependence and in patients with alcoholic liver disease when compared with that in control subjects. In addition, the incidence of ALDH2*1/*2 and ALDH2*2/*2 was significantly reduced in alcoholics compared with control subjects. Genetic polymorphism of ADH2/ALDH2 in patients with alcoholic liver disease was not different from that of alcohol dependents. According to these results, not only ALDH2 gene, often claimed to be responsible for alcohol dependence among Japanese, but also ADH2 gene polymorphism, which modulates the metabolism of ethanol, play important roles in habitual alcohol intake behavior...Continue Reading

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