Functional investigation of miRNAs by characterization of SH-SY5Y cells overexpressing wild type or mutant miRNA genes

Genome wide miRNA and mRNAs profiling was performed in SH-SY5Y cells stably overexpressing wild type or mutant MIR204 or MIR618.Mutants came from a large scale genetic screening of brain expressed miRNA genes in patients with schizophrenia or idiopathic generalized epilepsy and in control individuals. Based on enrichment of the variants with the schizophrenic or epileptic phenotype and based on impact prediction, two variants, one near MIR204 (rs7861254) and one in MIR618 (rs2682818) were selected for functional validation. Genome wide profiling of mRNA and miRNAs was performed in the created stable cells to assess the effect of the variants and to investigate the function of these miRNA genes.