The following statement are true about tumor suppressor gene p53, except
## Core Concept
The tumor suppressor gene **p53** plays a crucial role in maintaining genomic stability and preventing cancer formation. It functions by regulating cell cycle arrest, DNA repair, and apoptosis in response to DNA damage. Mutations in **p53** are among the most common alterations found in human cancers.
## Why the Correct Answer is Right
The correct answer, which is not provided, would typically relate to a statement about **p53** that is not accurate. Generally, **p53** is known for its role in halting the cell cycle to allow for DNA repair or to induce apoptosis if the damage is irreparable. It is activated in response to various forms of cellular stress, including DNA damage, telomere shortening, and oncogene activation.
## Why Each Wrong Option is Incorrect
Since the specific options (A, B, C, D) and the correct answer are not provided, let's discuss general incorrect statements about **p53**:
- **Option A:** If a statement claims **p53** is an oncogene, it would be incorrect because **p53** acts as a tumor suppressor.
- **Option B:** If a statement suggests **p53** mutations are rare in human cancers, it would be incorrect because **p53** mutations are very common.
- **Option C:** If a statement says **p53** promotes cell cycle progression, it would be incorrect because **p53** typically induces cell cycle arrest.
- **Option D:** If a statement claims **p53** is not involved in apoptosis, it would be incorrect because **p53** can induce apoptosis in response to severe DNA damage.
## Clinical Pearl / High-Yield Fact
A key point to remember is that **p53** is often referred to as the "guardian of the genome" due to its critical role in maintaining genomic stability. Mutations in **p53** can lead to a loss of its tumor suppressor functions, contributing to cancer development. A classic example of **p53** dysfunction is Li-Fraumeni syndrome, a rare inherited disorder that significantly increases the risk of developing certain types of cancer.
## Correct Answer: D.