Following Gene when mutated protects tumor cells from apoptosis
**Core Concept**
The p53 gene is a tumor suppressor gene that plays a crucial role in regulating cell cycle, DNA repair, and apoptosis. Mutations in the p53 gene can lead to loss of its function, resulting in uncontrolled cell growth and tumor development.
**Why the Correct Answer is Right**
The correct answer is the gene that, when mutated, protects tumor cells from apoptosis. The TP53 gene, also known as p53, is a key regulator of apoptosis. When p53 is mutated, it can no longer induce apoptosis in damaged cells, allowing them to survive and proliferate. This is a common mechanism of tumor development and progression. The p53 protein acts by binding to specific DNA sequences, regulating the expression of target genes involved in apoptosis, cell cycle arrest, and DNA repair.
**Why Each Wrong Option is Incorrect**
**Option A:** No information is available to indicate that the BCL-2 gene is involved in protecting tumor cells from apoptosis through a gene mutation.
**Option B:** The NF1 gene is a tumor suppressor gene that regulates cell growth and differentiation, but it is not directly involved in protecting tumor cells from apoptosis.
**Option C:** The RB1 gene is a tumor suppressor gene that regulates cell cycle progression, but it is not directly involved in protecting tumor cells from apoptosis.
**Option D:** The PTEN gene is a tumor suppressor gene that regulates cell growth and survival, but it is not directly involved in protecting tumor cells from apoptosis.
**Clinical Pearl / High-Yield Fact**
The p53 gene is often referred to as the "guardian of the genome" due to its critical role in maintaining genomic stability and preventing tumor development.
**Correct Answer: D. PTEN gene is not the correct answer, the actual answer is not listed. A more accurate question would be: Following Gene when mutated protects tumor cells from apoptosis, the correct answer would be: A. MDM2.**