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Published in: Molecular Cancer 1/2009

Open Access 01-12-2009 | Research

The protein tyrosine phosphatase receptor type R gene is an early and frequent target of silencing in human colorectal tumorigenesis

Authors: Mirco Menigatti, Elisa Cattaneo, Jacob Sabates-Bellver, Valery V Ilinsky, Philip Went, Federico Buffoli, Victor E Marquez, Josef Jiricny, Giancarlo Marra

Published in: Molecular Cancer | Issue 1/2009

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Abstract

Background

Tumor development in the human colon is commonly accompanied by epigenetic changes, such as DNA methylation and chromatin modifications. These alterations result in significant, inheritable changes in gene expression that contribute to the selection of tumor cells with enhanced survival potential.

Results

A recent high-throughput gene expression analysis conducted by our group identified numerous genes whose transcription was markedly diminished in colorectal tumors. One of these, the p rotein- t yrosine p hosphatase r eceptor type R (PTPRR) gene, was dramatically downregulated from the earliest stages of cellular transformation. Here, we show that levels of both major PTPRR transcript variants are markedly decreased (compared with normal mucosal levels) in precancerous and cancerous colorectal tumors, as well in colorectal cancer cell lines. The expression of the PTPRR-1 isoform was inactivated in colorectal cancer cells as a result of de novo CpG island methylation and enrichment of transcription-repressive histone-tail marks, mainly H3K27me3. De novo methylation of the PTPRR-1 transcription start site was demonstrated in 29/36 (80%) colorectal adenomas, 42/44 (95%) colorectal adenocarcinomas, and 8/8 (100%) liver metastases associated with the latter tumors.

Conclusions

Epigenetic downregulation of PTPRR seems to be an early alteration in colorectal cell transformation, which is maintained during the clonal selection associated with tumor progression. It may represent a preliminary step in the constitutive activation of the RAS/RAF/MAPK/ERK signalling, an effect that will later be consolidated by mutations in genes encoding key components of this pathway.
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Metadata
Title
The protein tyrosine phosphatase receptor type R gene is an early and frequent target of silencing in human colorectal tumorigenesis
Authors
Mirco Menigatti
Elisa Cattaneo
Jacob Sabates-Bellver
Valery V Ilinsky
Philip Went
Federico Buffoli
Victor E Marquez
Josef Jiricny
Giancarlo Marra
Publication date
01-12-2009
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2009
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/1476-4598-8-124

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