A massive Nature study combined genetic data from more than one million cases across 14 psychiatric disorders.

There are five broad genetic families that explain much of why certain psychiatric diagnoses cluster together.

Our diagnostic labels may be less like separate diseases and more like regions on a shared map.

When someone is diagnosed with depression and anxiety, it rarely surprises their clinician. When someone with schizophrenia has mood symptoms, it rarely surprises their family. Comorbidity has always been psychiatry’s everyday reality. What has been harder to explain is why these overlaps are so common and whether the diagnostic boundaries in our manuals reflect distinct biological conditions or a set of human-made labels drawn around a shared landscape.

A new paper in Nature takes a major step toward answering that question. By analyzing common genetic variation across 14 psychiatric disorders, researchers created one of the most detailed maps yet of what is shared, what is distinct, and where today’s categories may be closer cousins than we think.

One Million Lives, Fourteen Diagnoses, One Underlying Problem

The researchers drew on genome-wide association data from 14 disorders, including schizophrenia, bipolar disorder, major depression, posttraumatic stress disorder (PTSD), anxiety disorders, attention-deficit/hyperactivity disorder (ADHD), autism, anorexia nervosa, obsessive-compulsive disorder (OCD), Tourette syndrome, and several substance use........

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