Array-based analysis of genomic DNA methylation patterns of the tumour suppressor gene p16INK4A promoter in colon carcinoma cell lines.

Abstract:

:Aberrant DNA methylation at CpG dinucleotides can result in epigenetic silencing of tumour suppressor genes and represents one of the earliest events in tumourigenesis. To date, however, high-throughput tools that are capable of surveying the methylation status of multiple gene promoters have been restricted to a limited number of cytosines. Here, we present an oligonucleotide microarray that permits the parallel analysis of the methylation status of individual cytosines, thus combining high throughput and high resolution. The approach was used to study the CpG island in the promoter region of the tumour suppressor gene p16(INK4A). In total, 876 oligonucleotide probes of 21 nt in length were used to inspect the methylation status of 53 CpG dinucleotides, producing correct signals in colorectal cancer cell lines as well as control samples with a defined methylation status. The information was validated by established alternative methods. The overall methylation pattern was consistent for each cell line, while different between them. At the level of individual cytosines, however, significant variations between individual cells of the same type were found, but also consistencies across the panel of cancer cell lines were observed.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Mund C,Beier V,Bewerunge P,Dahms M,Lyko F,Hoheisel JD

doi

10.1093/nar/gni072

keywords:

subject

Has Abstract

pub_date

2005-04-28 00:00:00

pages

e73

issue

8

eissn

0305-1048

issn

1362-4962

pii

33/8/e73

journal_volume

33

pub_type

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