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From SNPedia

Alcohol dependence, popularly known as alcoholism, is a psychiatric diagnosis describing a physical dependence on alcohol. Trailing only smoking and overeating, it is the third leading preventable cause of death. Wikipedia

Several SNPs have been implicated in the tendency towards and/or the treatment of alcoholism, including:

However, note also that a large meta-analysis found no significant associations for SNPs in six genes (BDNF, DRD1, DRD3, DRD4, GRIN2B and MAOA).[PMID 25660313]

blog human and rat models of alcoholism