Genetic polymorphisms of the promoter region of dopamine D2 receptor and dopamine transporter genes and alcoholism among four aboriginal groups and Han Chinese in Taiwan

Wei J. Chen, Chia Hsiang Chen, Jielen Huang, Yun Pung P. Hsu, See Voon Seow, Chiao Chicy Chen, Andrew T.A. Cheng*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

44 Scopus citations

Abstract

This study aims to examine the relationship between the functional polymorphism at the promoter region of the dopamine D2 receptor (DRD2) gene (i.e. -141C Ins / Del) and variable number of tandem repeat polymorphism at the 3′ untranslated region of the dopamine transporter (DAT) gene (SLC6A3) with alcoholism in a case-control study. The cases (n = 203) were alcohol dependents with withdrawal symptoms, and the controls (n = 213) were sex- and ethnicity-matched individuals who were screened to exclude those with alcohol problems among four aboriginal groups (Atayal, Ami, Bunun, and Paiwan) and Han Chinese in Taiwan. To control for potential confounding factors, we excluded tobacco abusers from control subjects in part of the analysis and compared the distribution of the genetic polymorphisms in alcoholics with severe medical complications versus those with less severe medical complications. There were no differences in allele and genotype frequencies of these two distinct genetic markers between alcoholics and control subjects in these five different ethnic groups. There was no significant linkage disequilibrium between the -141C polymorphism and two other DRD2 polymorphisms (TaqI A and NcoI). The results remained unchanged when cases were limited to alcoholics with more severe medical complications or when tobacco abusers were excluded from control subjects. The results suggest that both the DRD2 promoter region and the DAT gene do not play a significant role in conferring vulnerability to alcoholism.

Original languageEnglish
Pages (from-to)187-195
Number of pages9
JournalPsychiatric Genetics
Volume11
Issue number4
DOIs
StatePublished - 2001
Externally publishedYes

Keywords

  • Alcoholism
  • Dopamine D2 receptor
  • Dopamine transporter
  • Genetics
  • Promoter

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