6 Million Genomes Uncover Shared Genetic Threads Across Mental Illnesses

A large international genetic study of over 6 million people finds that major psychiatric disorders share substantial genetic risk, clustering into five broad groups (compulsive disorders; schizophrenia and bipolar; neurodevelopmental disorders; internalizing disorders; and substance-use disorders). The work links these patterns to specific brain cell types and argues for a biology-based reclassification of mental illness and treatments that target shared pathways, while noting that genetics influence risk but environmental factors also shape outcomes.