Colbert, Sarah M CSarah M CColbertMonson, Eric TEric TMonsonAndreassen, Ole AOle AAndreassenAyinde, Olatunde OOlatunde OAyindeBarr, Peter BPeter BBarrBejan, Cosmin ACosmin ABejanCeja, ZurielZurielCejaCoon, HilaryHilaryCoonDiBlasi, EmilyEmilyDiBlasiEdenberg, Howard JHoward JEdenbergGelernter, JoelJoelGelernterHatoum, AlexanderAlexanderHatoumIzotova, AnastasiaAnastasiaIzotovaJohnson, Emma CEmma CJohnsonKaufman, Erin AErin AKaufmanKranzler, Henry RHenry RKranzlerKoromina, MariaMariaKorominaLehto, KelliKelliLehtoMyung, WoojaeWoojaeMyungNurnberger, John IJohn INurnbergerSerretti, AlessandroAlessandroSerrettiSmoller, Jordan WJordan WSmollerStein, Murray BMurray BSteinZai, Clement CClement CZaiErlangsen, AnnetteAnnetteErlangsenGaine, MarieMarieGaineMartorell, LourdesLourdesMartorellSud, ReetekaReetekaSudToma, ClaudioClaudioTomaBigdeli, Tim BTim BBigdeliKimbrel, Nathan ANathan AKimbrelRuderfer, DouglasDouglasRuderferDocherty, Anna RAnna RDochertyMann, J JohnJ JohnMannMullins, NiamhNiamhMullinsSHIH-CHENG LIAOHSI-CHUNG CHENet al.2026-03-202026-03-202025-12https://scholars.lib.ntu.edu.tw/handle/123456789/736463Suicidality phenotypes, consisting of suicidal ideation (SI), suicide attempt (SA), and suicide death (SD), are all heritable but present unique challenges in genome-wide association studies (GWAS) due to their individual complexity, overlap with each other and with related self-harm phenotypes, and varying associations with psychiatric disorders. GWAS have uncovered several loci associated with suicidality phenotypes by meta-analyzing data from multiple cohorts. However, combining datasets from many research groups, where each group may use different study designs, phenotyping instruments, and definitions of suicidality phenotypes, presents challenges. Heterogeneity resulting from these differences can limit genetic discovery; harmonizing phenotype definitions to ensure consistency will greatly improve results. Here, we describe a standardized phenotyping protocol that draws on the expertise of a subgroup of clinicians, researchers, and experts from the Psychiatric Genomics Consortium Suicide Working Group to propose consensus definitions for SI, SA, and SD for genetic studies.enjournal article10.1038/s41380-025-03271-y40999039