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Related Experiment Videos

Changes in BRCA2 expression during progression of the cell cycle

S C Wang1, S H Lin, L K Su

  • 1Department of Tumor Biology, University of Texas M. D. Anderson Cancer Center, Houston 77030, USA.

Biochemical and Biophysical Research Communications
|May 8, 1997
PubMed
Summary

BRCA1 and BRCA2 gene expression is low in quiescent cells but increases during the cell cycle, suggesting roles in cell growth regulation and breast cancer progression.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • Genetic alterations in BRCA1 and BRCA2 are linked to increased breast cancer risk.
  • Understanding the cell cycle expression of these genes is crucial for comprehending their function.

Purpose of the Study:

  • To investigate the expression patterns of BRCA1 and BRCA2 RNA throughout the cell cycle.
  • To correlate gene expression with cell proliferation and cell cycle phases.

Main Methods:

  • Northern blot analysis was used to examine BRCA1 and BRCA2 RNA expression.
  • MCF-10F (normal) and MCF-7 (breast cancer) cell lines were utilized.
  • Cells were analyzed in different phases of the cell cycle, including quiescence and after nocodazole-induced arrest.

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Main Results:

  • BRCA2 RNA expression was low in G0/G1 phases, increasing at the G1/S junction and remaining high through S and G2/M phases.
  • BRCA1 and BRCA2 RNA expression patterns were similar in proliferating cells.
  • Transcripts for both genes were undetectable in quiescent cells.
  • BRCA2 transcript levels decreased in MCF-7 cells upon release from metaphase arrest.

Conclusions:

  • BRCA1 and BRCA2 exhibit distinct expression profiles during the cell cycle.
  • These genes appear to play significant roles in the regulation of cell growth.
  • The findings contribute to understanding the cellular functions of BRCA1 and BRCA2 in the context of cancer predisposition.