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Human GABA, Receptor α l and α 3 Subunits Genes and Alcoholism
Author(s) -
Parsian A.,
Cloninger C. R.
Publication year - 1997
Publication title -
alcoholism: clinical and experimental research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.267
H-Index - 153
eISSN - 1530-0277
pISSN - 0145-6008
DOI - 10.1111/j.1530-0277.1997.tb03787.x
Subject(s) - gene , genetics , biology
γ‐Aminobutyric acid (GABA) is the major inhibitory neurotransmitter in the brain. GABA effects are largely mediated by binding to the postsynaptic GABA A receptor, causing the opening of an integral chloride‐ion channel. The GABA A antagonists picrotoxin and bicuculline reduce some ethanol‐induced behaviors, such as motor impairment, sedation, and hypnosis. The role of this receptor in alcoholism is further supported by effective alleviation of alcohol withdrawal symptoms by GABA A agonists. To determine the role of the GABA, receptor (GABR) genes in the development of alcoholism, we have used α 1 and α 3 simple sequence repeat polymorphisms in a sample of unrelated alcoholics, alcoholic probands with both parents, and psychiatrically normal controls. For the GABRα 1 gene, the differences between allele frequencies, when all alleles were compared together, were not significant between total alcoholics, subtypes of alcoholics, and normal controls. However, for GABRα 3 , the differences between total alcoholics and normal controls were significant when all alleles were compared together. The differences between subtypes of alcoholics and normal controls were not significant. The results of haplotype relative risk analysis for both genes, GABRα 1 and GABRα 3 , were also negative. It is possible that the sample size in the haplotype relative risk is too small to have power to detect the differences in transmitted versus nontransmitted alleles. There is a need for a replication study in a large family sample, that will allow haplotype relative risk or affected sib‐pair analysis.