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Related Concept Videos

The Retinoblastoma Gene01:20

The Retinoblastoma Gene

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
The Retinoblastoma Gene01:20

The Retinoblastoma Gene

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
Loss of Tumor Suppressor Gene Functions01:12

Loss of Tumor Suppressor Gene Functions

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
Loss of Tumor Suppressor Gene Functions01:12

Loss of Tumor Suppressor Gene Functions

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
Cancer-Critical Genes II: Tumor Suppressor Genes01:05

Cancer-Critical Genes II: Tumor Suppressor Genes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
Cancer-Critical Genes II: Tumor Suppressor Genes01:05

Cancer-Critical Genes II: Tumor Suppressor Genes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...

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Related Experiment Video

Updated: Jun 16, 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

BRCA gene structure and function in tumor suppression: a repair-centric perspective.

Conleth G Murphy1, Mary Ellen Moynahan

  • 1Breast Cancer Medicine Service, Memorial Sloan-Kettering Cancer Center, New York City, NY 10065, USA.

Cancer Journal (Sudbury, Mass.)
|February 19, 2010
PubMed
Summary

Defective DNA repair, particularly homologous recombination, drives cancer in BRCA mutation carriers and offers therapeutic targets. This study explores repair-defective phenotypes beyond BRCA mutations for broader cancer treatment strategies.

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Related Experiment Videos

Last Updated: Jun 16, 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

Functional Assessment of BRCA1 variants using CRISPR-Mediated Base Editors
09:22

Functional Assessment of BRCA1 variants using CRISPR-Mediated Base Editors

Published on: February 28, 2021

Silencing of BRCA2 to Identify Novel BRCA2-regulated Biological Functions in Cultured Human Cells
09:24

Silencing of BRCA2 to Identify Novel BRCA2-regulated Biological Functions in Cultured Human Cells

Published on: August 12, 2015

Area of Science:

  • Molecular Biology
  • Genetics
  • Oncology

Background:

  • Germline mutations in BRCA1 and BRCA2 genes impair homologous recombination repair of DNA double-strand breaks.
  • Defective DNA repair is a significant factor in tumorigenesis and a potential therapeutic target.
  • BRCA1-deficient tumors share transcriptional similarities with basal-like sporadic tumors, suggesting homologous recombination repair-directed therapy for triple-negative breast cancers.

Purpose of the Study:

  • To broaden the understanding of cancer therapy by focusing on a general "repair-defective" phenotype.
  • To discuss the structural and functional roles of key homologous recombination repair proteins.
  • To review mechanisms of repair pathway dysfunction in sporadic tumors and guide therapy development.

Main Methods:

  • Review of structural and functional aspects of BRCA1, BRCA2, and associated proteins (e.g., BARD1, PALB2).
  • Analysis of phenotypic consequences of repair protein loss at cellular, tissue, and organism levels.
  • Examination of potential mechanisms of homologous recombination repair pathway dysfunction in sporadic cancers.

Main Results:

  • Detailed discussion of key homologous recombination repair proteins and the cellular, tissue, and organismal impacts of their dysfunction.
  • Identification of potential mechanisms driving repair pathway defects in sporadic tumors.
  • Exploration of how understanding these defects can inform the application of targeted therapies.

Conclusions:

  • Defects in homologous recombination repair are crucial in tumorigenesis and represent a viable therapeutic avenue.
  • Expanding the focus to a general "repair-defective" phenotype, beyond BRCA mutations, can broaden therapeutic strategies.
  • Identifying specific repair pathway dysfunctions in sporadic tumors is key to guiding the development and application of effective repair-directed therapies.