A study suggests that major mental disorders like autism, ADHD, bipolar disorder, major depression, and schizophrenia, which were thought to be distinct, share certain genetic variations. This indicates potential genetic connections among these disorders. The study used data from genome-wide association studies to analyze over 33,000 patients with these disorders and found significant genetic variations associated with all five conditions. Specific genes related to calcium regulation in neurons, particularly CACNA1C and CACNB2, were linked to these disorders. Additionally, certain regions of chromosomes 3 and 10 were found to have illness-linked variations. While these genetic associations alone can't predict or diagnose these conditions, they could contribute to better diagnoses and a deeper understanding of the disorders' causes.