The Eating Disorders Genetics Initiative 2 (EDGI2): study protocol.
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Berthold Natasha, MacDermod Casey M, Thornton Laura M, Parker Richard, Morales Shantal Anid Cortés, Hog Liv, Kennedy Hannah L, Guintivano Jerry, Sullivan Patrick F, Crowley James J, Johnson Jessica S, Birgegård Andreas, Fundín Bengt T, Frans Emma, Xu Jiayi, Ngāti Pūkenga Michaela Pettie, Miller Allison L, Aguilar Mariana Valdez, Barakat Sarah, Abdulkadir Mohamed, White Jennifer P, Larsen Janne T, Trujillo Elsie, Winterman Bertha, Zhang Ruyue, Lawson Rachel, Wonderlich Stephen, Wonderlich Joseph, Schaefer Lauren M, Mehler Philip S, Oakes Judy, Foster Marina, Gaudiani Jennifer, Vacuán Eva Trujillo Chi, Compte Emilio J, Petersen Liselotte V, Yilmaz Zeynep, Micali Nadia, Jordan Jennifer, Kennedy Martin A, Maguire Sarah, Huckins Laura M, Lu Yi, Dinkler Lisa, Martin Nicholas G, Bulik Cynthia M
Аннотация
METHODS: A total of 20,000 new participants (18,700 cases and 1,300 controls) will be ascertained from the United States (US), Mexico (MX), Australia (AU), Aotearoa New Zealand (NZ), Sweden (SE), and Denmark (DK). Comprehensive phenotyping and genotyping will be performed for participants in US, MX, AU, NZ, and SE using the EDGI2 questionnaire battery and participant saliva samples. In DK, case identification and genotyping will be through the National Patient Register and bloodspots archived near birth. Case-control and case-case genome-wide association studies will be conducted within EDGI2 and enhanced via meta-analysis with external data from the Eating Disorders Working Group of the Psychiatric Genomics Consortium (PGC-ED). Additional analyses will explore genetic correlations between eating disorders (EDs) and other psychiatric and metabolic traits, calculate polygenic risk scores (PRS), and leverage functional biology to evaluate clinical outcomes. Moreover, analyzing PRS for patient stratification and linking identified risk loci to clinically relevant phenotypes highlight the potential of EDGI2 for clinical translation.
DISCUSSION: EDGI2 is a global expansion of the EDGI study to increase sample size, increase participant representation across multiple ancestral backgrounds, and to include ARFID. ED genetics research has historically lagged behind other psychiatric disorders, and EDGI2 is designed to rapidly advance the study of the genetics of the major EDs. Exploring EDs at both the diagnostic level and the symptom level will provide an unprecedented look at the genetic architecture underlying EDs.
TRIAL REGISTRATION: EDGI2 is a registered clinical trial: clinicaltrials.gov NCT06594913. https://clinicaltrials.gov/study/NCT06594913 (posted September 19, 2024).