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Int. J. Mol. Sci. 2016, 17(8), 1291; doi:10.3390/ijms17081291

A Genome-Wide Methylation Approach Identifies a New Hypermethylated Gene Panel in Ulcerative Colitis

1
Department of Microbiology, Dankook University, Cheonan 31116, Korea
2
Research Center, Dongnam Institute of Radiological & Medical Sciences (DIRAMS), Busan 46033, Korea
3
Department of Nanobiomedical Science Global Research Center for Regenerative Medicine, Dankook University, Cheonan 31116, Korea
4
DKU-Theragen Institute for NGS Analysis (DTiNa), Dankook University; Cheonan 31116, Korea
5
Division of Gastroenterology, Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu 41931, Korea
6
Department of Internal Medicine, Haeundae Paik Hospital, Inje University College of Medicine, Busan 48108, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Alfredo Ciccodicola
Received: 21 June 2016 / Revised: 26 July 2016 / Accepted: 3 August 2016 / Published: 9 August 2016
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
View Full-Text   |   Download PDF [1518 KB, uploaded 9 August 2016]   |  

Abstract

The cause of inflammatory bowel disease (IBD) is still unknown, but there is growing evidence that environmental factors such as epigenetic changes can contribute to the disease etiology. The aim of this study was to identify newly hypermethylated genes in ulcerative colitis (UC) using a genome-wide DNA methylation approach. Using an Infinium HumanMethylation450 BeadChip array, we screened the DNA methylation changes in three normal colon controls and eight UC patients. Using these methylation profiles, 48 probes associated with CpG promoter methylation showed differential hypermethylation between UC patients and normal controls. Technical validations for methylation analyses in a larger series of UC patients (n = 79) were performed by methylation-specific PCR (MSP) and bisulfite sequencing analysis. We finally found that three genes (FAM217B, KIAA1614 and RIBC2) that were significantly elevating the promoter methylation levels in UC compared to normal controls. Interestingly, we confirmed that three genes were transcriptionally silenced in UC patient samples by qRT-PCR, suggesting that their silencing is correlated with the promoter hypermethylation. Pathway analyses were performed using GO and KEGG databases with differentially hypermethylated genes in UC. Our results highlight that aberrant hypermethylation was identified in UC patients which can be a potential biomarker for detecting UC. Moreover, pathway-enriched hypermethylated genes are possibly implicating important cellular function in the pathogenesis of UC. Overall, this study describes a newly hypermethylated gene panel in UC patients and provides new clinical information that can be used for the diagnosis and therapeutic treatment of IBD. View Full-Text
Keywords: DNA methylation profile; promoter hypermethylation; ulcerative colitis; biomarker DNA methylation profile; promoter hypermethylation; ulcerative colitis; biomarker
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kang, K.; Bae, J.-H.; Han, K.; Kim, E.S.; Kim, T.-O.; Yi, J.M. A Genome-Wide Methylation Approach Identifies a New Hypermethylated Gene Panel in Ulcerative Colitis. Int. J. Mol. Sci. 2016, 17, 1291.

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