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Utility of Scalp Hair Follicles as a Novel Source of Biomarker Genes for Psychiatric Illnesses Motoko MAEKAWA 1 , Takeo YOSHIKAWA 1 1Lab. for Molecular Psychiatry, Brain Science Institute, RIKEN, Wako, Japan Keyword: Hair follicle , Postmortem brain , iPS cell , Ectoderm , Schizophrenia pp.935-942
Published Date 2015/11/15
DOI https://doi.org/10.11477/mf.1405205058

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  • Abstract
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 Identifying the beneficial surrogate markers in psychiatric disorders is crucial but challenging. Given that the scalp hair follicles are easily accessible and, like the brain, are derived from the ectoderm, expressions of messenger RNA (mRNA) and micro RNA (miRNA) in the organ were examined between two sets of between schizophrenia and control with schizophrenia. We selected the genes for GABA (γ-aminobutyric acid)-ergic system components, myelin and fatty acids, as schizophrenia-relevant genes. We examined whether those genes are expressed in the hair follicles, and if so, whether the expression differs between cases and controls. Among the genes examined, mRNA levels of FABP4 (gene for fatty acid binding protein 4) were downregulated in subjects with schizophrenia in two independent sample sets. FABP4 mRNA levels were also analyzed in postmortem brains, induced pluripotent stem cells, and pluripotent stem cell-derived neurospheres to determine its role in the central nervous system. FABP4 was expressed from the neurosphere stage. Additionally, microarray-based miRNA analysis showed a trend of increased expression of hsa-miR-4449 (p=0.0634) in the hair follicles in schizophrenia. hsa-miR-4449 expression was increased in BA (Brodmann Area) 46 in schizophrenia postmortem brains (p=0.0007). Lastly, we tested the expression of nine putative autism candidate genes in the hair follicles and found decreased CNTNAP2 (gene for contactin associated protein-like 2) expression in the autism cohort. Collectively, our results suggest that the scalp hair follicles could be a beneficial genetic biomarker resource for neurologic diseases, and that further studies on FABP4 are merited in schizophrenia pathogenesis.


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電子版ISSN 1882-126X 印刷版ISSN 0488-1281 医学書院

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