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Chapter 11: Problem 12

Name any checkpoint gene.

Short Answer

Expert verified
TP53 (p53) is a checkpoint gene.

Step by step solution

01

Understanding Checkpoint Genes

Checkpoint genes are crucial in the regulation of the cell cycle. They help ensure that the various processes necessary for cell division are completed properly before the cell proceeds to the next stage.
02

Identifying a Checkpoint Gene

One of the most well-known checkpoint genes is TP53, also known as p53. It plays an important role in preventing the proliferation of cells that have damaged DNA by halting the process until the DNA can be repaired.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Checkpoint Genes
Checkpoint genes are like the cell's personal safety inspectors, ensuring everything is running smoothly during cell division.
These genes monitor the cell cycle, which includes phases such as growth, DNA replication, and division.
When a checkpoint is reached, these genes assess whether the tasks up to that point have been performed accurately.
  • If everything is correct, the checkpoint genes allow the cell to proceed to the next phase.
  • However, if there is a problem, such as DNA damage, checkpoint genes can pause the cycle.
This pause gives the cell time to repair any issues, preventing potentially harmful cells from continuing to divide unchecked.
By halting the process when necessary, checkpoint genes help maintain genetic stability and prevent the proliferation of damaged cells.
TP53 Gene
The TP53 gene, often referred to as the "guardian of the genome," is one of the most critical checkpoint genes.
It takes on an essential role as a tumor suppressor, meaning it can stop the formation of tumors by regulating the cell cycle.
When DNA damage is detected, the TP53 protein becomes activated.
  • Firstly, it can halt the cell cycle, giving the cell time to attempt DNA repair.
  • If repair is possible, the TP53 restores normal cell function.
  • If repair is not possible, it can initiate cell death or apoptosis to eliminate the potentially dangerous cell.
Mutations in the TP53 gene are often associated with many forms of cancer.
When mutated, its ability to control the cell cycle and manipulate cell repair diminishes, leading to uncontrolled cell division.
DNA Repair
DNA repair is a critical process that fixes damage to the DNA, which can happen due to various factors like UV rays, chemicals, or errors during replication.
Repair mechanisms ensure that genetic information is accurately passed on to the next generation of cells.
There are several DNA repair pathways:
  • Mismatch Repair: Fixes errors that escaped during DNA replication.
  • Base Excision Repair: Corrects base damage caused by spontaneous chemical reactions.
  • Nucleotide Excision Repair: Repairs bulky, helix-distorting lesions in the DNA.
  • Double-Strand Break Repair: Fixes severe breaks in both DNA strands.
These processes continuously safeguard the integrity of the genome.
Efficient DNA repair mechanisms, controlled in part by checkpoint genes like TP53, are essential in preventing mutations that could lead to diseases like cancer.

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Most popular questions from this chapter

Except for a pairing of sex chromosomes, homologous chromosomes ___________. a. carry the same genes b. are the same shape c. are the same length d. all of the above

After mitosis, the chromosome number of a descendant cell is ___________ the parent cell's. a. the same as b. one-half of c. rearranged compared to d. doubled compared to

Match each stage with the events listed. __________metaphase __________prophase __________telophase __________anaphase a. sister chromatids move apart b. chromosomes start to condense c. new nuclei form d. all duplicated chromosomes are aligned at the spindle equator

Only _______ is not a stage of mitosis a. prophase b. interphase c. metaphase d. anaphase

Mitosis and cytoplasmic division function in ________. a. asexual reproduction of single-celled eukaryotes b. growth and tissue repair in multicelled species c. gamete formation in bacteria and archaeans d. both a and b
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