Abstract
Colorectal sessile serrated adenomas (SSA) are hypothesized to be precursor lesions of an alternative, serrated pathway of colorectal cancer, abundant in genes with aberrant promoter DNA hypermethylation. In our present pilot study, we explored DNA methylation profiles and examined selected gene mutations in SSA. Biopsy samples from patients undergoing screening colonoscopy were obtained during endoscopic examination. After DNA isolation and quality analysis, SSAs (n = 4) and healthy controls (n = 5) were chosen for further analysis. DNA methylation status of 96 candidate genes was screened by q(RT)PCR using Methyl-Profiler PCR array system. Amplicons for 12 gene mutations were sequenced by GS Junior Instrument using ligated and barcoded adaptors. Analysis of DNA methylation revealed 9 hypermethylated genes in both normal and SSA samples. 12 genes (CALCA, DKK2, GALR2, OPCML, PCDH10, SFRP1, SFRP2, SLIT3, SST, TAC1, VIM, WIF1) were hypermethylated in all SSAs and 2 additional genes (BNC1 and PDLIM4) were hypermethylated in 3 out of 4 SSAs, but in none of the normal samples. 2 SSAs exhibited BRAF mutation and synchronous MLH1 hypermethylation and were microsatellite instable by immunohistochemical analysis. Our combined mutation and DNA methylation analysis revealed that there is a common DNA methylation signature present in pre-neoplastic SSAs. This study advocates for the use of DNA methylation as a potential biomarker for the detection of SSA; however, further investigation is needed to better characterize the molecular background of these newly recognized colorectal lesions.
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Acknowledgements
Authors are deeply indebted to colleagues at the Endoscopy Unit and also to Gabriella Farkas Kónyáné (2nd Department of Medicine, Semmelweis University) for her skilled technical work and assistance in the immunohistochemical analyses.
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This study was supported by the National Office for Research and Technology, Hungary, (Grant number: TECH_08-A1/2–2008-0114) and by the Hungarian Scientific Research Fund (OTKA, Grant number: K 111743). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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Árpád V. Patai, Barbara Kinga Barták and Bálint Péterfia contributed equally to this work.
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Supplementary Fig. 1
Characteristic histopathological image of SSA. SSA: sessile serrated adenoma (JPEG 11 kb)
Supplementary Fig. 2
Principle of Methyl-Profiler DNA methylation analysis (EpiTect Methyl qPCR Array System, figure provided by Qiagen, with permission) (JPEG 4 kb)
Supplementary Fig. 3
Principle of methylation-sensitive restriction enzyme analysis. Mock reaction contains no enzymes, double reaction contains both enzymes. Methylation-sensitive restriction enzyme cleaves at unmethylated CpG sites, whereas methylation-dependent restriction enzyme cleaves at methylated CpG sites. Empty circle unmethylated cytosine, full circle: methylated cytosine (JPEG 7 kb)
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Patai, Á.V., Barták, B.K., Péterfia, B. et al. Comprehensive DNA Methylation and Mutation Analyses Reveal a Methylation Signature in Colorectal Sessile Serrated Adenomas. Pathol. Oncol. Res. 23, 589–594 (2017). https://doi.org/10.1007/s12253-016-0154-6
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DOI: https://doi.org/10.1007/s12253-016-0154-6