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Updated: Jun 17, 2026

Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1
08:53

Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1

Published on: February 17, 2011

Altered gene expression in morphologically normal epithelial cells from heterozygous carriers of BRCA1 or BRCA2

Alfonso Bellacosa1, Andrew K Godwin, Suraj Peri

  • 1Fox Chase Cancer Center, Philadelphia, PA 19111, USA. Alfonso.Bellacosa@fccc.edu

Cancer Prevention Research (Philadelphia, Pa.)
|January 7, 2010
PubMed

Insights

Inherited mutations in tumor suppressor genes like BRCA1 and BRCA2 alter mRNA in normal cells. These early molecular changes may serve as cancer risk biomarkers and chemoprevention targets.

Area of Science:

  • Genomics
  • Molecular Biology
  • Cancer Research

Background:

  • Inherited mutations in tumor suppressor genes increase cancer risk.
  • Early molecular alterations in tumorigenesis are not well understood.
  • Identifying early changes can aid in cancer prevention and risk assessment.

Purpose of the Study:

  • To investigate mRNA expression changes in phenotypically normal epithelial cells from BRCA1 and BRCA2 mutation carriers.
  • To identify potential early molecular biomarkers for cancer risk.
  • To explore targets for chemoprevention strategies.

Main Methods:

  • Transcriptome analysis of primary breast and ovarian epithelial cells from mutation carriers and controls.
  • Comparison of gene expression profiles between groups.
  • Validation of differentially expressed genes using real-time reverse transcription-PCR.

Main Results:

  • Multiple gene expression changes were identified in both breast and ovarian cells from BRCA1 and BRCA2 mutation carriers compared to controls.
  • Differentially expressed genes included known cancer markers like mammaglobin and serum amyloid.
  • These expression changes were validated independently.

Conclusions:

  • Heterozygosity for mutant tumor suppressor genes alters mRNA profiles in normal epithelial cells.
  • These "one hit" effects represent early molecular changes in tumorigenesis.
  • These findings suggest novel biomarkers for cancer risk and potential chemoprevention targets.

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