Sequence Analysis of the DNA Binding Domain of the Estrogen Receptor Gene in ER (+ )/PR (‐) Breast Cancer
作者:
Carolyn Mies,
Walter Voigt,
期刊:
Diagnostic Molecular Pathology
(OVID Available online 1996)
卷期:
Volume 5,
issue 1
页码: 39-44
ISSN:1052-9551
年代: 1996
出版商: OVID
关键词: Estrogen receptor;Progesterone receptor;Breast cancer
数据来源: OVID
摘要:
Estrogen stimulates the proliferation of breast cancer cells and regulates the expression of other proteins, including the progesterone receptor (PR), via interaction with a unique estrogen receptor (ER), a ligand-inducible transcription factor that binds to regulatory DNA sequences associated with target genes. The best indirect evidence of an intact ER gene signaling system in a tumor is the demonstration of both ER and PR cytosol protein. The molecular basis of the ER (+)/PR (-) phenotype is unknown and may reflect either defective PR gene expression or alterations in the ER—specifically, inability of the ligand-receptor complex to effectively bind to regulatory sequences in DNA. To test the latter possibility, we evaluated 10 ER ( +)/PR (-) resected human breast cancers for small deletions and point mutations in the DNA binding domain of the ER gene. Exons 2 and 3 and their flanking intron sequences were selectively amplified using the polymerase chain reaction and then directly sequenced using the Sanger dideoxynucleotide method. A normal gene sequence was found in all cases studied. We conclude that sequence aberrations in the DNA binding domain of the ER are not a common cause of absent PR expression in ER (+)/PR (-) breast carcinomas.
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