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Published in: Virchows Archiv 1/2013

01-01-2013 | Original Article

Diagnostic utility of MS-MLPA in DNA methylation profiling of adenocarcinomas and neuroendocrine carcinomas of the colon–rectum

Authors: Daniela Furlan, Nora Sahnane, Mara Mazzoni, Roberta Pastorino, Ileana Carnevali, Michele Stefanoli, Andrea Ferretti, Anna Maria Chiaravalli, Stefano La Rosa, Carlo Capella

Published in: Virchows Archiv | Issue 1/2013

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Abstract

Methylation-specific multiple ligation-dependent probe amplification (MS-MLPA) is a fast, new, inexpensive method that has rarely been exploited in DNA methylation profiling of colorectal cancers (CRCs). The aim of this study was to test the diagnostic utility of MS-MLPA to evaluate the methylation status of 34 genes in normal colonic mucosa samples and in a well-characterized series of 83 adenocarcinomas and 21 neuroendocrine carcinomas of colon–rectum. Two commercial MS-MLPA kits (SALSA MS-MLPA ME001-C1 Tumor suppressor-1 Kit and SALSA MS-MLPA ME002-B1 Tumor suppressor-2 Kit) were used to perform promoter methylation analysis on formalin-fixed and paraffin-embedded tissues. MS-MLPA analysis was validated by bisulfite pyrosequencing, bisulfite cycle sequencing, and methylation-specific PCR. MS-MLPA analysis identified a subset of 27 CRCs (26 % of cases) showing high levels of gene methylation involving a mean percentage of 34 % of the promoters examined. These tumors exhibited all the main clinicopathological and genetic features described for CRCs with CpG island Methylator Phenotype-High. High levels of methylation were observed with similar frequency in adenocarcinomas and in neuroendocrine carcinomas (25 % versus 29 %, respectively), but different methylation profiles were observed in the two tumor types. In both groups, tumors with microsatellite instability and widespread methylation represented a homogeneous clinicopathological entity. MS-MLPA assay is an easy and reliable system for epigenetic characterization of tumor tissues and leads to a rapid identification of CRCs with the highest levels of gene methylation. Aberrant gene methylation is a common abnormality in CRC initiation and may be observed in tumors with very different genetic and clinicopathological profiles.
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Metadata
Title
Diagnostic utility of MS-MLPA in DNA methylation profiling of adenocarcinomas and neuroendocrine carcinomas of the colon–rectum
Authors
Daniela Furlan
Nora Sahnane
Mara Mazzoni
Roberta Pastorino
Ileana Carnevali
Michele Stefanoli
Andrea Ferretti
Anna Maria Chiaravalli
Stefano La Rosa
Carlo Capella
Publication date
01-01-2013
Publisher
Springer-Verlag
Published in
Virchows Archiv / Issue 1/2013
Print ISSN: 0945-6317
Electronic ISSN: 1432-2307
DOI
https://doi.org/10.1007/s00428-012-1348-2

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