Single- and multilocus allelic variants within the GABA(B) receptor subunit 2 (GABAB2) gene are significantly associated with nicotine dependence.
paper
Cited
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- Authors
- Beuten, Joke; Ma, Jennie Z; Payne, Thomas J; Dupont, Randolph T; Crews, Karen M; Somes, Grant; Williams, Nancy J; Elston, Robert C; Li, Ming D
- Year
- 2005
- Journal
- American journal of human genetics
- PMID
- 15759211
- DOI
- 10.1086/429839
- PMCID
- PMC1199374
Twelve single-nucleotide polymorphisms (SNPs) in the human gamma-aminobutyric acid type B (GABA(B)) receptor subunit 2 gene (GABAB2) were tested for association with nicotine dependence (ND) in an extensively phenotyped cohort of 1,276 smokers and nonsmokers, representing approximately 404 nuclear families of African American (AA) or European American (EA) origin. The GABAB2 gene encodes a subunit of the GABA(B) receptor for GABA, an inhibitory neurotransmitter involved in the regulation of many physiological and psychological processes in the brain. The gene is located within a region of chromosome 9q22 that showed a "suggestive" linkage to ND. Individual SNP analysis performed using the PBAT-GEE program indicated that two SNPs in the AAs and four SNPs in the EAs were significantly associated with ND. Haplotype analysis using the Family-Based Association Test revealed that, even after Bonferroni correction, the haplotype C-C-G of rs2491397-rs2184026-rs3750344 had a significant positive association with ND in both the pooled and the AA samples. In the EAs, we identified two haplotypes, C-A-C-A and T-A-T-A, formed by SNPs rs1435252-rs378042-rs2779562-rs3750344, that showed a highly significant negative and positive association with ND, respectively. In summary, our findings provide evidence of a significant association of GABAB2 variants with ND, implying that this gene plays an important role in the etiology of this drug addiction.
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