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Genome-wide association study identifies eight risk loci and implicates metabo-psychiatric origins for anorexia nervosa

One-paragraph summary

The ANGI/PGC-ED genome-wide association study analyzed 16,992 AN cases and 55,525 controls. It identified eight genome-wide significant loci and genetic correlations with psychiatric disorders, physical activity and metabolic, lipid and anthropometric traits; metabolic correlations were not explained solely by common BMI-associated variants (Watson 2019, PMID 31308545).

Key findings

  • 16,992 cases and 55,525 controls.
  • Eight genome-wide significant loci.
  • Twin heritability context summarized as 50–60%.
  • Genetic correlations crossed conventional psychiatric/metabolic boundaries.

Limitations

  • Association does not identify effector genes or causal direction.
  • Discovery ancestry limits portability.
  • Polygenic results do not provide an individual diagnostic test.
  • Clinical treatment translation was not tested.

Standing in 2026 (audit, 2026-09-02)

A live search on 2026-09-02 confirmed that no larger case-control GWAS of anorexia nervosa has been published since 2019; Watson 2019 remains the anchor discovery study. A 2026 integrative meta-analysis of European and Finnish AN GWAS data added one novel genome-wide significant locus near SOX5 and, through multi-trait analysis borrowing power from correlated traits, 86 significant loci including 25 novel ones such as VAMP2 (17p13.1), LPL (8p21.3) and BDNF (11p14.1); local genetic-correlation analysis identified 185 shared regions with pleiotropy at 100, and single-cell transcriptomics concentrated the risk signal in limbic and striatal GABAergic neurons (Song 2026, PMID 41927769). MTAG loci are not equivalent to loci discovered in AN cases, and enrichment maps expression rather than causation — but the work moves the metabo-psychiatric claim from trait-level correlation toward named genes and a cell type, which is exactly the translational step this paper called for.

Standing after the 2026-09-30 sweep

The statement above that no larger case-control GWAS had been published is superseded. A Psychiatric Genomics Consortium meta-analysis of 24,223 AN cases and 1,243,971 controls from 26 European-ancestry datasets, published in Nature Mental Health and indexed in PubMed after the 2026-09-02 audit, reports eight genome-wide significant loci: six previously reported and two additional (Termorshuizen 2026, PMID 42718672). Two of this paper's eight loci (chromosomes 2 and 3) and the 2017 chromosome 12 locus fell just short (P = 2 × 10⁻⁷ to 6 × 10⁻⁷); the four single-gene loci (CADM1, MGMT, FOXP1, PTBP2) remained significant. Liability-scale SNP heritability was 13% (SE 0.7%). The psychiatric, metabolic and anthropometric correlation pattern was, in the authors' words, validated and extended, and a factor shared with BMI accounted for only 10% (SE 1.4%) of AN genetic variance. A European-derived polygenic score was associated with AN in Korean and Japanese samples (OR 1.36, 95% CI 1.09–1.70; 152 cases). Because the new analysis reuses previously analysed consortium data, this is partial rather than independent replication. Watson 2019 remains the paper that established the metabo-psychiatric framing; it is no longer the largest case-control study.

Why it matters

The work changed the field’s dominant framing from purely psychiatric toward “metabo-psychiatric,” creating a testable translational agenda while also creating risk of overinterpretation.

Cited by wiki pages

  • Overview
  • Genetics
  • Pharmacotherapy