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Epigenetic regulation of ID4 in the determination of the BRCAness phenotype in breast cancer.

Abstract：

:BRCAness breast tumors represent a group of sporadic tumors characterized by a reduction in BRCA1 gene expression. As BRCA1 is involved in double-strand breaks (DSBs) repair, dysfunctional BRCA pathway could make a tumor sensitive to DNA damaging drugs (e.g., platinum agents). Thus, accurately identifying BRCAness could contribute to therapeutic decision making in patients harboring these tumors. The purpose of this study was to identify if BRCAness tumors present a characteristic methylation profile and/or were related to specific clinico-pathological features. BRCAness was measured by MLPA in 63 breast tumors; methylation status of 98 CpG sites within 84 cancer-related genes was analyzed by MS-MLPA. Protein and mRNA expressions of the selected genes were measured by quantitative real-time PCR and Western Blot. BRCAness was associated with younger age, higher nuclear pleomorphism, and triple-negative (TN) status. Epigenetically, we found that the strongest predictors for BRCAness tumors were the methylations of MLH1 and PAX5 plus the unmethylations of CCND2 and ID4. We determined that ID4 unmethylation correlated with the expression levels of both its mRNA and protein. We observed an inverse relation between the expressions of ID4 and BRCA1. To the best of our knowledge, this is the first report suggesting an epigenetic regulation of ID4 in BRCAness tumors. Our findings give new information of BRCAness etiology and encourage future studies on potential drug targets for BRCAness breast tumors.

journal_name

Breast Cancer Res Treat

journal_title

Breast cancer research and treatment

authors

Branham MT,Campoy E,Laurito S,Branham R,Urrutia G,Orozco J,Gago F,Urrutia R,Roqué M

doi

10.1007/s10549-015-3648-0

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

13-23

issue

1

eissn

0167-6806

issn

1573-7217

pii

10.1007/s10549-015-3648-0

journal_volume

155

pub_type

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