Superficially, the connection between the cell cycle and cancer is obvious: cell cycle machinery controls cell proliferation, and cancer is a disease of inappropriate cell proliferation. Fundamentally, all cancers permit the existence of too many cells.
How do you think cancer and cell cycle checkpoints are related?
Two checkpoints are sensitive to DNA damage, one that acts before mitosis and a second that acts before DNA replication. This is relevant to cancer because checkpoint mutants show genetic instability, and such instability is characteristic of many cancers.
How does the car analogy apply to a mutated tumor suppressor gene?
A tumor suppressor gene is like the brake pedal on a car. It normally keeps the cell from dividing too quickly, just as a brake keeps a car from going too fast. When something goes wrong with the gene, such as a mutation, cell division can get out of control.
What are the six hallmarks of cancer as discussed in the course and described by Douglas Hanahan and Robert Weinberg?
The original six hallmarks are: self-sufficiency in growth signals, insensitivity to anti-growth signals, tissue invasion and metastasis, limitless replicative potential, sustained angiogenesis (blood vessel growth), and evasion of apoptosis (cell death).
What is regulation of cell cycle?
Positive Regulation of the Cell Cycle Two groups of proteins, called cyclins and cyclin-dependent kinases (Cdks), are responsible for the progress of the cell through the various checkpoints. The levels of the four cyclin proteins fluctuate throughout the cell cycle in a predictable pattern (Figure 2).
What happens in the cell cycle quizlet?
The cell cycle is a series of events that cells go through as they grow and divide. During the cell cycle, a cell grows, prepares for division, and divides to form two daughter cells, each of which then begins the cycle again.
What does each cell cycle checkpoint do?
Cell cycle checkpoints are surveillance mechanisms that monitor the order, integrity, and fidelity of the major events of the cell cycle. These include growth to the appropriate cell size, the replication and integrity of the chromosomes, and their accurate segregation at mitosis.
What is gas pedal analogy?
The analogy of a car is often used to describe the function of proto-oncogenes, oncogenes and tumor suppressors in the cell cycle and cell division. The gas pedal pushes the car/cell into the cell cycle and promotes cellular division and the brake pedal stops the cell cycle and inhibits cellular division.
What is the fundamental feature of all cancer cells?
Cancer cells grow and divide at an abnormally rapid rate, are poorly differentiated, and have abnormal membranes, cytoskeletal proteins, and morphology. The abnormality in cells can be progressive with a slow transition from normal cells to benign tumors to malignant tumors.
What regulates progression in the cell cycle?
CDK complexes are the the ones who regulate the progression of a cell cycle. These complexes are composed of CDKs (cyclin-dependent kinase) and cyclins whish are primarily located at G1/S checkpoint, G2/M checkpoint, and in the m phase checkpoint.
