Gene copy number variation in pediatric mental illness in a general population

We assessed the relationship of gene copy number variation (CNV) in mental health/neurodevelopmental traits and diagnoses, physical health, and cognitive biomarkers in a community sample of 7,100 unrelated European, and East Asian children and youth (Spit for Science). Diagnoses of mental health disorders were found in 17.5% of participants and 27.6% scored in the highest 10% on either or both ADHD and OCD trait measures. Clinically relevant CNVs were present in 3.9% of participants and were associated with elevated scores on a continuous measure of ADHD (p=5.0×10−3), on a cognitive biomarker of mental health (response inhibition (p=1.0×10−2)), and on prevalence of mental disorders (p=1.9×10−6, odds ratio: 3.09). With a rise of mental illness, our data establishes a baseline for delineating genetic contributors in paediatric-onset conditions.One Sentence SummaryCopy number variation predicts neurodevelopmental and mental health phenotypes in the general population.