Related Experiment Video
Updated: Aug 19, 2026
Genetic Profiling and Genome-Scale Dropout Screening to Identify Therapeutic Targets in Mouse Models of Malignant Peripheral Nerve Sheath Tumor
Published on: August 25, 2023
Abstract:
The well-characterized function of many tumor suppressors is to directly regulate cell cycle events. We recently reported a genetic screen to identify genes that suppress loss of contact inhibition but do not inhibit normal cell proliferation. ING4, one of the genes identified by the screen, is frequently mutated in human cancer, suggesting a role for ING4 as a tumor suppressor. ING4 suppresses tumor cell features such as loss of contact inhibition, cell growth in soft agar, and tumor growth in nude mice. ING4 may belong to a class of tumor suppressors whose function is specific to a tumorigenic event that does not directly involve deregulation of the cell cycle. Studies of these tumor suppressors may provide insight into the molecular mechanisms underlying such tumorigenic events.
Insights
ING4, a newly identified tumor suppressor, prevents cancer cell characteristics like loss of contact inhibition and tumor growth. This gene may represent a novel class of tumor suppressors acting independently of cell cycle regulation.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Many known tumor suppressors regulate cell cycle events.
- A genetic screen identified genes suppressing loss of contact inhibition without affecting normal proliferation.
Purpose of the Study:
- To investigate the role of ING4, identified in a genetic screen, as a potential tumor suppressor.
- To explore ING4's function in suppressing tumorigenic events independent of cell cycle regulation.
Main Methods:
- Genetic screening to identify novel tumor suppressor genes.
- Assays for cell proliferation, soft agar colony formation, and tumor growth in nude mice.
- Analysis of ING4 mutations in human cancers.
Main Results:
- ING4 was identified as a gene suppressing loss of contact inhibition.
- ING4 is frequently mutated in human cancers.
- ING4 suppresses key tumor cell features, including loss of contact inhibition, anchorage-independent growth, and in vivo tumor formation.
Conclusions:
- ING4 functions as a tumor suppressor by inhibiting critical tumorigenic phenotypes.
- ING4 may represent a novel class of tumor suppressors that act independently of cell cycle control.
- Further studies on ING4 could elucidate mechanisms of tumorigenesis not directly linked to cell cycle deregulation.
More Related Videos
10:27Testing Targeted Therapies in Cancer using Structural DNA Alteration Analysis and Patient-Derived Xenografts
Published on: July 25, 2020
09:37Defining Gene Functions in Tumorigenesis by Ex vivo Ablation of Floxed Alleles in Malignant Peripheral Nerve Sheath Tumor Cells
Published on: August 25, 2021
Related Concept Videos
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...
01:12Loss 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...
01:05Cancer-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...
01:05Cancer-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...
01:20The 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,...
02:07Tumor 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...