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J Stroke. 2018 Sep;20(3):350-361. English. Original Article. https://doi.org/10.5853/jos.2018.00962
Sung HY , Lee JY , Park AK , Moon YJ , Jo I , Park EM , Wang KC , Phi JH , Ahn JH , Kim SK .
Department of Biochemistry, Ewha Womans University College of Medicine, Seoul, Korea. nsthomas@snu.ac.kr ahnj@ewha.ac.kr
Department of Anatomy, Seoul National University College of Medicine, Seoul, Korea.
Division of Pediatric Neurosurgery, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, Korea. nsthomas@snu.ac.kr ahnj@ewha.ac.kr
Suncheon National University College of Pharmacy, Suncheon, Korea.
Department of Molecular Medicine, Ewha Womans University College of Medicine, Seoul, Korea.
Department of Pharmacology, Ewha Womans University College of Medicine, Seoul, Korea.
Abstract

Background and Purpose

The pathogenesis of moyamoya disease (MMD) remains poorly understood, and no reliable molecular biomarkers for MMD have been identified to date. The present study aimed to identify epigenetic biomarkers for use in the diagnosis of MMD.

Methods

We performed integrated analyses of gene expression profiles and DNA methylation profiles in endothelial colony forming cells (ECFCs) from three patients with MMD and two healthy individuals. Candidate gene mRNA expression and DNA methylation status were further validated using reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and pyrosequencing analysis of an expanded ECFC sample set from nine patients with MMD and ten controls. We evaluated the diagnostic accuracy of the potential biomarkers identified here using receiver operating characteristic curve analyses and further measured major angiogenic factor expression levels using a tube formation assay and RT-qPCR.

Results

Five candidate genes were selected via integrated analysis; all five were upregulated by hypomethylation of specific promoter CpG sites. After further validation in an expanded sample set, we identified a candidate biomarker gene, sortilin 1 (SORT1). DNA methylation status at a specific SORT1 promoter CpG site in ECFCs readily distinguished patients with MMD from the normal controls with high accuracy (area under the curve 0.98, sensitivity 83.33%, specificity 100%). Furthermore, SORT1 overexpression suppressed endothelial cell tube formation and modulated major angiogenic factor and matrix metalloproteinase-9 expression, implying SORT1 involvement in MMD pathogenesis.

Conclusions

Our findings suggest that DNA methylation status at the SORT1 promoter CpG site may be a potential biomarker for MMD.

Copyright © 2019. Korean Association of Medical Journal Editors.