The largest genetic study of drinking to date, in 274,424 people, found that how much someone drinks and whether they develop a use disorder are related but genetically separable — heavy drinking is a risk factor, not a sufficient cause.
Alcohol use disorder (AUD) is a diagnosed pattern of impaired control over drinking, distinct from — though related to — how much a person drinks. Kranzler et al. 2019 studied both in the same very large sample: 274,424 people from the multi-ancestry Million Veteran Program, using AUDIT-C (a consumption-level score) alongside AUD diagnoses.
The study found 18 genome-wide-significant loci in total: 5 associated with both consumption and AUD diagnosis, 8 with consumption only, and 5 with AUD diagnosis only. One of the shared loci is rs1229978, near ADH1C (p=1×10⁻¹⁴) — part of the well-known cluster of alcohol-metabolizing genes on chromosome 4 that also includes ADH1B and ADH4/ADH5, and sits near rs1229984, the classic ADH1B variant common in East Asian populations that slows alcohol metabolism.
The study's own conclusion is the more important finding here: heavy drinking is a key risk factor for AUD, but not a sufficient cause of it. The genetic correlation between the two traits is real but incomplete — genetic correlations with 188 other, non-alcohol-related traits differed significantly between consumption and diagnosis, meaning they are measuring related but distinguishable things, not the same underlying trait twice.
Alcohol use disorder is diagnosed clinically against DSM criteria, not by genotype. The variant on this page is not used by any guideline to diagnose AUD or predict drinking level in an individual.
This is a population-level finding from a very large sample, and the study itself distinguishes consumption level from disorder diagnosis as genetically separable traits — a reminder that "drinks more" and "has a use disorder" are not the same question, genetically or clinically.
What a 23andMe/AncestryDNA export or raw VCF can and can't tell you about Alcohol Use Disorder comes down to these specific, well-studied positions — not a diagnosis.
The studies behind these variants recruited participants from different ancestries — a result found in one population doesn't always transfer to another. Based on 7 of 7 linked studies with a resolved discovery ancestry.
Databases, guidelines and references
Alcohol use disorder (AUD) is a diagnosed pattern of impaired control over drinking, distinct from — though related to — how much a person drinks.
Studying 274,424 people, it found 18 genome-wide-significant loci: 5 associated with both drinking level and AUD diagnosis, 8 with drinking level only, and 5 with AUD diagnosis only.
It is a key risk factor, but the study's own conclusion is that it is "not a sufficient cause" — drinking level and AUD diagnosis are related but genetically separable traits.
No. AUD is diagnosed clinically, not by genotype. This is a population-level finding from a very large study, not an individual prediction.
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