Journal of Korean Neurosurgical Society

The Korean Neurosurgical Society (대한신경외과학회)
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Identification of Differentially-Methylated Genes and Pathways in Patients with Delayed Cerebral Ischemia Following Subarachnoid Hemorrhage

  • Kim, Bong Jun (Institute of New Frontier Stroke Research, Hallym University College of Medicine) ;
  • Youn, Dong Hyuk (Institute of New Frontier Stroke Research, Hallym University College of Medicine) ;
  • Chang, In Bok (Department of Neurosurgery, Hallym University College of Medicine) ;
  • Kang, Keunsoo (Department of Microbiology, College of Science & Technology, Dankook University) ;
  • Jeon, Jin Pyeong (Department of Neurosurgery, Hallym University College of Medicine)
  • Received : 2021.02.09
  • Accepted : 2021.05.14
  • Published : 2022.01.01
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Abstract

Objective : We reported the differentially methylated genes in patients with subarachnoid hemorrhage (SAH) using bioinformatics analyses to explore the biological characteristics of the development of delayed cerebral ischemia (DCI). Methods : DNA methylation profiles obtained from 40 SAH patients from an epigenome-wide association study were analyzed. Functional enrichment analysis, protein-protein interaction (PPI) network, and module analyses were carried out. Results : A total of 13 patients (32.5%) experienced DCI during the follow-up. In total, we categorized the genes into the two groups of hypermethylation (n=910) and hypomethylation (n=870). The hypermethylated genes referred to biological processes of organic cyclic compound biosynthesis, nucleobase-containing compound biosynthesis, heterocycle biosynthesis, aromatic compound biosynthesis and cellular nitrogen compound biosynthesis. The hypomethylated genes referred to biological processes of carbohydrate metabolism, the regulation of cell size, and the detection of a stimulus, and molecular functions of amylase activity, and hydrolase activity. Based on PPI network and module analysis, three hypermethylation modules were mainly associated with antigen-processing, Golgi-to-ER retrograde transport, and G alpha (i) signaling events, and two hypomethylation modules were associated with post-translational protein phosphorylation and the regulation of natural killer cell chemotaxis. VHL, KIF3A, KIFAP3, RACGAP1, and OPRM1 were identified as hub genes for hypermethylation, and ALB and IL5 as hub genes for hypomethylation. Conclusion : This study provided novel insights into DCI pathogenesis following SAH. Differently methylated hub genes can be useful biomarkers for the accurate DCI diagnosis.

Keywords

Acknowledgement

This research was supported by the National Research Foundation of Korea funded by the Ministry of Education (2020R1l1A3070726) and Hallym University Research Fund.

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