Project name: Homo sapiens

Description: Schizophrenia (SCZ) and bipolar disorder (BD) are highly heritable psychiatric disorders. Associated genetic and gene expressionchanges have been identified, but many have not been replicated and have unknown functions. We identified groups of geneswhose expressions varied together, that is co-expression modules, then tested them for association with SCZ. Using weighted geneco-expression network analysis, we show that two modules were differentially expressed in patients versus controls. One,upregulated in cerebral cortex, was enriched with neuron differentiation and neuron development genes, as well as diseasegenome-wide association study genetic signals; the second, altered in cerebral cortex and cerebellum, was enriched with genesinvolved in neuron protection functions. The findings were preserved in five expression data sets, including sets from three brainregions, from a different microarray platform, and from BD patients. From those observations, we propose neuron differentiationand development pathways may be involved in etiologies of both SCZ and BD, and neuron protection function participates inpathological process of the diseases.Overall design: We use microarray technology to understand the etiology and pathology of psychiatric diseases at the transcriptomic level. Postmortem human brain samples came from the Stanley Medical Research Institute’s Neuropathology Consortium and Array collections, including schizophrenia, bipolar disorder and control samples.

Data type: Transcriptome or Gene expression

Sample scope: Multiisolate

Relevance: Medical

Last updated: 2012-02-21