Related Experiment Video
Updated: Dec 29, 2025
Defining Gene Functions in Tumorigenesis by Ex vivo Ablation of Floxed Alleles in Malignant Peripheral Nerve Sheath Tumor Cells
Published on: August 25, 2021
A History of Cancer Research: Tumor Suppressor Genes
1Departments of Pathology, Genetics, and Biology, Stanford University, Stanford, California 94305-5324, USA.
Abstract:
Tumor suppressor genes encode critical intracellular regulators, such as the retinoblastoma protein. They control processes including cell proliferation, cell survival, and responses to DNA damage and are frequently mutated in cancer. In this excerpt from his forthcoming book on the history of cancer research, Joe Lipsick looks back at the discovery of tumor suppressor genes, covering the early work on cell fusion by Henry Harris, Knudson's two-hit hypothesis, the genetic mapping studies that first identified the RB gene, and subsequent work on silencing.
Insights
Tumor suppressor genes are vital regulators that prevent cancer. Their discovery involved key research on cell fusion, the two-hit hypothesis, and identifying the RB gene.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Tumor suppressor genes regulate cell proliferation, survival, and DNA damage response.
- These genes are frequently altered in various cancers.
- Understanding their function is crucial for cancer research.
Observation:
- Early research utilized cell fusion experiments to study gene regulation in cancer.
- Knudson's two-hit hypothesis proposed that multiple genetic events are necessary for tumor formation.
- Genetic mapping studies were instrumental in pinpointing specific tumor suppressor genes.
Findings:
- The discovery of tumor suppressor genes, including the retinoblastoma (RB) gene, has been a landmark in cancer research.
- Subsequent studies focused on the mechanisms of tumor suppressor gene silencing.
- These genes act as critical intracellular regulators.
Implications:
- The identification and characterization of tumor suppressor genes have revolutionized our understanding of cancer development.
- This knowledge underpins the development of targeted cancer therapies.
- Further research into gene silencing mechanisms may reveal new therapeutic strategies.
Related Concept Videos
01:05Cancer-Critical Genes II: Tumor Suppressor Genes
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...
01:12Loss of Tumor Suppressor Gene Functions
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...
01:33Cancer-Critical Genes I: Proto-oncogenes
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...
01:20The Retinoblastoma Gene
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,...
02:18Cancer
02:07Tumor Progression
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...