Interaction between the functional polymorphisms of the alcohol-metabolism genes in protection against alcoholism

被引:370
作者
Chen, CC
Lu, RB
Chen, YC
Wang, MF
Chang, YC
Li, TK
Yin, SJ
机构
[1] Natl Def Med Ctr, Dept Biochem, Taipei 10764, Taiwan
[2] Natl Def Med Ctr, Grad Inst Med Sci, Taipei 10764, Taiwan
[3] Taipei City Psychiat Ctr, Dept Adult Psychiat, Taipei, Taiwan
[4] Taipei Med Coll, Dept Psychiat, Taipei, Taiwan
[5] Tri Serv Gen Hosp, Dept Psychiat, Taipei, Taiwan
[6] Tamkang Univ, Dept Math, Tamsui, Taiwan
[7] Indiana Univ, Sch Med, Dept Med, Indianapolis, IN USA
[8] Indiana Univ, Sch Med, Dept Biochem & Mol Biol, Indianapolis, IN USA
关键词
D O I
10.1086/302540
中图分类号
Q3 [遗传学];
学科分类号
071007 [遗传学]; 090102 [作物遗传育种];
摘要
The genes that encode the major enzymes of alcohol metabolism, alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH), exhibit functional polymorphism. The variant alleles ADH2*2 and ADH3*1, which encode high-activity ADH isoforms, and the ALDH2*2 allele, which encodes the low-activity form of ALDH2, protect against alcoholism in East Asians. To investigate possible interactions among these protective genes, we genotyped 340 alcoholic and 545 control Han Chinese living in Taiwan at the ADH2, ADH3, and ALDH2 loci. After the influence of ALDH2*2 was controlled for, multiple logistic regression analysis indicated that allelic variation at ADH3 exerts no significant effect on the risk of alcoholism. This can be accounted for by linkage disequlibrium between ADH3*1 and ADH2*2 ALDH2*2 homozygosity, regardless of the ADH2 genotypes, was fully protective against alcoholism; no individual showing such homozygosity was found among the alcoholics. Logistic regression analyses of the remaining six combinatorial genotypes of the polymorphic ADH2 and ALDH2 loci indicated that individuals carrying one or two copies of ADH2*2 and a single copy of ALDH2*2 had the lowest risk (ORs 0.04-0.05) for alcoholism, as compared with the ADH2*1/*1 and ALDH2*1/*1 genotype. The disease risk associated with the ADH2*2/*2-ALDH2*1/*1 genotype appeared to be about half of that associated with the ADH2*2/*2-ALDH2*1/*1 genotype. The results suggest that protection afforded by the ADH2*2 allele may be independent of that afforded by ALDH2*2.
引用
收藏
页码:795 / 807
页数:13
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