TY - JOUR
T1 - The Eating Disorders Genetics Initiative 2 (EDGI2)
T2 - study protocol
AU - Berthold, Natasha
AU - MacDermod, Casey M.
AU - Thornton, Laura M.
AU - Parker, Richard
AU - Morales, Shantal Anid Cortés
AU - Hog, Liv
AU - Kennedy, Hannah L.
AU - Guintivano, Jerry
AU - Sullivan, Patrick F.
AU - Crowley, James J.
AU - Johnson, Jessica S.
AU - Birgegård, Andreas
AU - Fundín, Bengt T.
AU - Frans, Emma
AU - Xu, Jiayi
AU - “Ngāti Pūkenga”, Michaela Pettie
AU - Miller, Allison L.
AU - Aguilar, Mariana Valdez
AU - Barakat, Sarah
AU - Abdulkadir, Mohamed
AU - White, Jennifer P.
AU - Larsen, Janne T.
AU - Trujillo, Elsie
AU - Winterman, Bertha
AU - Zhang, Ruyue
AU - Lawson, Rachel
AU - Wonderlich, Stephen
AU - Wonderlich, Joseph
AU - Schaefer, Lauren M.
AU - Mehler, Philip S.
AU - Oakes, Judy
AU - Foster, Marina
AU - Gaudiani, Jennifer
AU - Vacuán, Eva Trujillo Chi
AU - Compte, Emilio J.
AU - Petersen, Liselotte V.
AU - Yilmaz, Zeynep
AU - Micali, Nadia
AU - Jordan, Jennifer
AU - Kennedy, Martin A.
AU - Maguire, Sarah
AU - Huckins, Laura M.
AU - Lu, Yi
AU - Dinkler, Lisa
AU - Martin, Nicholas G.
AU - Bulik, Cynthia M.
N1 - Publisher Copyright:
© The Author(s) 2025.
PY - 2025/12
Y1 - 2025/12
N2 - Background: The Eating Disorders Genetics Initiative 2 (EDGI2) is designed to explore the role of genes and environment in anorexia nervosa, bulimia nervosa, binge-eating disorder, and avoidant/restrictive food intake disorder (ARFID) with a focus on broad population representation and severe and/or longstanding illness. 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).
AB - Background: The Eating Disorders Genetics Initiative 2 (EDGI2) is designed to explore the role of genes and environment in anorexia nervosa, bulimia nervosa, binge-eating disorder, and avoidant/restrictive food intake disorder (ARFID) with a focus on broad population representation and severe and/or longstanding illness. 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).
KW - Anorexia nervosa
KW - Avoidant/restrictive food intake disorder
KW - Binge-eating disorder
KW - Bulimia nervosa
KW - Genome-wide association
KW - Psychiatric genetics
UR - https://www.scopus.com/pages/publications/105006949742
U2 - 10.1186/s12888-025-06777-5
DO - 10.1186/s12888-025-06777-5
M3 - Article
C2 - 40419993
AN - SCOPUS:105006949742
SN - 1471-244X
VL - 25
JO - BMC Psychiatry
JF - BMC Psychiatry
IS - 1
M1 - 532
ER -
