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Loss of Tumor Suppressor Gene Functions

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 Functions

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...

Abnormal Proliferation

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...

Cancer-Critical Genes II: Tumor Suppressor Genes

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 Genes

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...

mTOR Signaling and Cancer Progression

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...

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Related Experiment Video

Updated: Jul 3, 2026

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer

Published on: April 13, 2015

PTEN: a default gate-keeping tumor suppressor with a versatile tail.

Xinjiang Wang¹, Xuejun Jiang

¹Cell Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA.

|July 16, 2008

Summary

The tumor suppressor PTEN is crucial for cell regulation and preventing cancer. This review details PTEN regulation, its carboxyl-tail modifications, and compares its

Area of Science:

Oncology
Molecular Biology
Cell Biology

Background:

The tumor suppressor Phosphatase and tensin homolog (PTEN) is a critical regulator of cellular processes, including proliferation, growth, migration, and apoptosis.
Dysregulation of PTEN is implicated in various human cancers, highlighting its role in carcinogenesis.
PTEN's function is tightly controlled through various regulatory mechanisms, including posttranslational modifications.

Purpose of the Study:

To review recent advances in understanding PTEN regulation.
To explore the role of PTEN's carboxyl-tail in its posttranslational modifications.
To compare the tumor suppressive mechanisms of PTEN and p53.

Main Methods:

Literature review of recent studies on PTEN regulation.

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Defining Gene Functions in Tumorigenesis by Ex vivo Ablation of Floxed Alleles in Malignant Peripheral Nerve Sheath Tumor Cells

Defining Gene Functions in Tumorigenesis by Ex vivo Ablation of Floxed Alleles in Malignant Peripheral Nerve Sheath Tumor Cells

Published on: August 25, 2021

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Last Updated: Jul 3, 2026

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer

Published on: April 13, 2015

Defining Gene Functions in Tumorigenesis by Ex vivo Ablation of Floxed Alleles in Malignant Peripheral Nerve Sheath Tumor Cells

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Published on: August 25, 2021

Detailed analysis of PTEN's carboxyl-terminal modifications.

Comparative analysis of PTEN and p53 tumor suppressor functions.

Main Results:

PTEN is a master regulator of cell biology, and its own regulation is crucial for preventing cancer.
The carboxyl-tail of PTEN is a key site for multiple posttranslational regulatory events.
PTEN acts as a constitutive surveillant against cancer, functioning as a default gatekeeper, unlike p53 which requires activation.

Conclusions:

Understanding PTEN regulation is vital for advancing cancer biology and therapeutic strategies.
The carboxyl-tail modifications of PTEN warrant further investigation for their role in tumorigenesis.
PTEN's constitutive surveillance role distinguishes it from other tumor suppressors like p53.