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Therefore, early identification of poor outcome could improve care. Genetic research has identified regions of the genome associated with AN. Patients with anorexia nervosa were identified via the Swedish eating disorder quality registers Stepwise and Riks\u00e4t and invited to participate in the Anorexia Nervosa Genetics Initiative. First, we associated genetic information longitudinally with eating disorder severity indexed by scores on the Clinical Impairment Assessment (CIA) in 2843 patients with lifetime AN with or without diagnostic migration to other forms of eating disorders followed for up to 16 years (mean\u2009=\u20095.3\u2009years). Second, we indexed the development of a severe and enduring eating disorder (SEED) by a high CIA score plus a follow-up time \u22655 years. We associated individual polygenic scores (PGSs) indexing polygenic liability for AN, schizophrenia, and body mass index (BMI) with severity and SEED. After multiple testing correction, only the BMI PGS when calculated with traditional clumping and\n                    <jats:italic>p<\/jats:italic>\n                    value thresholding was robustly associated with disorder severity (\n                    <jats:italic>\u03b2<\/jats:italic>\n                    <jats:sub>PGS<\/jats:sub>\n                    \u2009=\u20091.30; 95% CI: 0.72, 1.88;\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20091.2\u2009\u00d7\u200910\n                    <jats:sup>\u20135<\/jats:sup>\n                    ) across all\n                    <jats:italic>p<\/jats:italic>\n                    value thresholds at which we generated the PGS. However, using the alternative PGS calculation method PRS-CS yielded inconsistent results for all PGS. The positive association stands in contrast to the negative genetic correlation between BMI and AN. Larger discovery GWASs to calculate PGS will increase power, and it is essential to increase sample sizes of the AN GWASs to generate clinically meaningful PGS as adjunct risk prediction variables. Nevertheless, this study provides the first evidence of potential clinical utility of PGSs for eating disorders.\n                  <\/jats:p>","DOI":"10.1038\/s41398-022-01831-2","type":"journal-article","created":{"date-parts":[[2022,2,16]],"date-time":"2022-02-16T02:02:56Z","timestamp":1644976976000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Polygenic association with severity and long-term outcome in eating disorder cases"],"prefix":"10.1038","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1043-7065","authenticated-orcid":false,"given":"Therese","family":"Johansson","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andreas","family":"Birgeg\u00e5rd","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5747-9428","authenticated-orcid":false,"given":"Ruyue","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah E.","family":"Bergen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mikael","family":"Land\u00e9n","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liselotte V.","family":"Petersen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cynthia M.","family":"Bulik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1267-8287","authenticated-orcid":false,"given":"Christopher","family":"H\u00fcbel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,2,16]]},"reference":[{"key":"1831_CR1","first-page":"131","volume":"5","author":"Z Yilmaz","year":"2015","unstructured":"Yilmaz Z, Hardaway JA, Bulik CM. 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