title: MicroRNA expression aberration as potential peripheral blood biomarkers for schizophrenia.
abstract: Since brain tissue is not readily accessible, a new focus in search of biomarkers for schizophrenia is blood-based expression profiling of non-protein coding genes such as microRNAs (miRNAs), which regulate gene expression by inhibiting the translation of messenger RNAs. This study aimed to identify potential miRNA signature for schizophrenia by comparing genome-wide miRNA expression profiles in patients with schizophrenia vs. healthy controls. A genome-wide miRNA expression profiling was performed using a Taqman array of 365 human miRNAs in the mononuclear leukocytes of a learning set of 30 cases and 30 controls. The discriminating performance of potential biomarkers was validated in an independent testing set of 60 cases and 30 controls. The expression levels of the miRNA signature were then evaluated for their correlation with the patients' clinical symptoms, neurocognitive performances, and neurophysiological functions. A seven-miRNA signature (hsa-miR-34a, miR-449a, miR-564, miR-432, miR-548d, miR-572 and miR-652) was derived from a supervised classification with internal cross-validation, with an area under the curve (AUC) of receiver operating characteristics of 93%. The putative signature was then validated in the testing set, with an AUC of 85%. Among these miRNAs, miR-34a was differentially expressed between cases and controls in both the learning (P = 0.005) and the testing set (P = 0.002). These miRNAs were differentially correlated with patients' negative symptoms, neurocognitive performance scores, and event-related potentials. The results indicated that the mononuclear leukocyte-based miRNA profiling is a feasible way to identify biomarkers for schizophrenia, and the seven-miRNA signature warrants further investigation.
authors: Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan.
authors: Chi-Yu
authors: CY
authors: Lai
authors: Sung-Liang
authors: SL
authors: Yu
authors: Ming H
authors: MH
authors: Hsieh
authors: Chun-Houh
authors: CH
authors: Chen
authors: Hsuan-Yu
authors: HY
authors: Chen
authors: Chun-Chiang
authors: CC
authors: Wen
authors: Yung-Hsiang
authors: YH
authors: Huang
authors: Po-Chang
authors: PC
authors: Hsiao
authors: Chuhsing Kate
authors: CK
authors: Hsiao
authors: Chih-Min
authors: CM
authors: Liu
authors: Pan-Chyr
authors: PC
authors: Yang
authors: Hai-Gwo
authors: HG
authors: Hwu
authors: Wei J
authors: WJ
authors: Chen
mesh_terms: D015415:Biomarkers / Q000097:blood*; D016022:Case-Control Studies; D006801:Humans; D035683:MicroRNAs / Q000097:blood*; D012559:Schizophrenia / Q000097:blood*
chemical_list: D015415:Biomarkers; C577008:MIRN564 microRNA, human; D035683:MicroRNAs