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Association of galanin haplotypes with alcoholism and anxiety in two ethnically distinct populations

Abstract

The neuropeptide galanin (GAL) is widely expressed in the central nervous system. Animal studies have implicated GAL in alcohol abuse and anxiety: chronic ethanol intake increases hypothalamic GAL mRNA; high levels of stress increase GAL release in the central amygdala. The coding sequence of the galanin gene, GAL, is highly conserved and a functional polymorphism has not yet been found. The aim of our study was, for the first time, to identify GAL haplotypes and investigate associations with alcoholism and anxiety. Seven single-nucleotide polymorphisms (SNPs) spanning GAL were genotyped in 65 controls from five populations: US and Finnish Caucasians, African Americans, Plains and Southwestern Indians. A single haplotype block with little evidence of historical recombination was observed for each population. Four tag SNPs were then genotyped in DSM-III-R lifetime alcoholics and nonalcoholics from two population isolates: 514 Finnish Caucasian men and 331 Plains Indian men and women. Tridimensional Personality Questionnaire harm avoidance (HA) scores, a dimensional measure of anxiety, were obtained. There was a haplotype association with alcoholism in both the Finnish (P=0.001) and Plains Indian (P=0.004) men. The SNPs were also significantly associated. Alcoholics were divided into high and low HA groups ( and P<0.0001) and diplotype (P<0.0001) distributions differed between high HA alcoholics, low HA alcoholics and nonalcoholics. Our results from two independent populations suggest that GAL may contribute to vulnerability to alcoholism, perhaps mediated by dimensional anxiety.

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Acknowledgements

We are grateful to Dr Alec Roy for permitting the use of a subset of his African American data set, and to Longina Akhtar and Lori Schwartz for technical assistance. This research was supported in part by the Office of Research on Minority Health and the Intramural Research Programs of the National Institute of Dental and Craniofacial Research and the National Institute on Alcohol Abuse and Alcoholism, NIH.

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Correspondence to I Belfer.

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Belfer, I., Hipp, H., McKnight, C. et al. Association of galanin haplotypes with alcoholism and anxiety in two ethnically distinct populations. Mol Psychiatry 11, 301–311 (2006). https://doi.org/10.1038/sj.mp.4001768

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