A profile of methyl-CpG binding domain protein occupancy of hypermethylated promoter CpG islands of tumor suppressor genes in human cancer.

Abstract:

:Methyl-CpG binding domain (MBD) proteins have been shown to couple DNA methylation to transcriptional repression. This biological property suggests a role for MBD proteins in the silencing of tumor suppressor genes that are hypermethylated at their promoter CpG islands in cancer cells. Despite the demonstration of the presence of MBDs in the methylated promoter of several genes, we still ignore how general and specific is this association. Here, we investigate the profile of MBD occupancy in a large panel of tumor suppressor gene promoters and cancer cell lines. Our study shows that most hypermethylated promoters are occupied by MBD proteins, whereas unmethylated promoters are generally devoid of MBDs, with the exception of MBD1. Treatment of cancer cells with the demethylating agent 5-aza-2'-deoxycytidine results in CpG island hypomethylation, MBD release, and gene reexpression, reinforcing the notion that association of MBDs with methylated promoters is methylation-dependent. Whereas several promoters are highly specific in recruiting a particular set of MBDs, other promoters seem to be less exclusive. Our results indicate that MBDs have a great affinity in vivo for binding hypermethylated promoter CpG islands of tumor suppressor genes, with a specific profile of MBD occupancy that it is gene and tumor type specific.

journal_name

Cancer Res

journal_title

Cancer research

authors

Lopez-Serra L,Ballestar E,Fraga MF,Alaminos M,Setien F,Esteller M

doi

10.1158/0008-5472.CAN-06-1932

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

8342-6

issue

17

eissn

0008-5472

issn

1538-7445

pii

66/17/8342

journal_volume

66

pub_type

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