A form of rare genomic structural variation called copy number variants (CNVs) may be more closely associated with schizophrenia than bipolar disorder. A new study published in Biological Psychiatry failed to find that CNVs were associated broadly with risk for bipolar disorder. However, schizoaffective disorder, which is a hybrid of bipolar disorder and schizophrenia, had higher rates of CNVs compared with controls and other bipolar disorder subtypes.
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