Polygenic Risk Scores Reveal the Complex Interplay Between Genetic Liability, Aggression, and Childhood Trauma in Suicidal Behavior

Introduction: The Multifaceted Nature of Suicidal Behavior

Suicide remains one of the most significant and complex challenges in global public health. While decades of research have established that suicidal behavior is heritable, identifying the specific genetic markers and understanding how they interact with an individual’s clinical phenotype and life history has proven difficult. Unlike many psychiatric disorders, suicidal behavior is not a single diagnosis but a complex phenomenon influenced by a constellation of internal traits, clinical conditions, and external environmental stressors.

In recent years, the development of polygenic scores (PGS) has offered a new lens through which to view these risks. A PGS aggregates the effects of thousands of genetic variants across the genome to provide a single measure of an individual’s genetic liability for a specific trait or behavior. In a landmark study published in JAMA Network Open, Kim et al. (2026) investigated how polygenic scores for suicide attempts (suicide-PGS) correlate with clinical characteristics, personality traits, and external stressors in both fatal and nonfatal suicidal behavior. This research provides a crucial step toward understanding the translational potential of genetic risk assessment in psychiatric settings.