Journal Article

Methylation of the BRCA1 promoter is associated with decreased BRCA1 mRNA levels in clinical breast cancer specimens

Judd C. Rice, Hilmi Ozcelik, Patrick Maxeiner, Irene Andrulis and Bernard W. Futscher

in Carcinogenesis

Volume 21, issue 9, pages 1761-1765
Published in print September 2000 | ISSN: 0143-3334
Published online September 2000 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/21.9.1761
Methylation of the BRCA1 promoter is associated with decreased BRCA1 mRNA levels in clinical breast cancer specimens

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Functional inactivation of BRCA1 is an important mechanism involved in breast cancer pathogenesis. Mutation is often responsible for BRCA1 inactivation in familial breast cancer, but is not responsible for the decreased levels of BRCA1 seen in a subset of sporadic breast cancer patients. To determine if aberrant cytosine methylation of the BRCA1 promoter is associated with decreased BRCA1 gene expression in human breast cancer, high resolution bisulfite sequence analysis was used to analyze the cytosine methylation status of the BRCA1 promoter in 21 axillary node negative breast cancer patients with known levels of BRCA1 expression. Aberrant cytosine methylation of the BRCA1 promoter was detected in three of 21 patient specimens. These three specimens also expressed the lowest levels of BRCA1. Results from this analysis show that aberrant cytosine methylation of the BRCA1 promoter is directly correlated with decreased levels of BRCA1 expression in human breast cancer, and suggest that epigenetic silencing may be one mechanism of transcriptional inactivation of BRCA1 in sporadic mammary carcinogenesis.

Keywords: HMEC, human mammary epithelial cells; PBL, peripheral blood lymphocytes.

Journal Article.  2946 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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