Question

extra credit (10pts on your lowest grade)
write 6-8 sentences explaining: \how does
a broken p53 lead to cancer?\ use at least 4
glossary words.

Explanation:

The p53 protein is a tumor suppressor that plays a crucial role in regulating the cell cycle and preventing cancer. When p53 is broken (mutated or non - functional), it can no longer perform its normal duties. Normally, p53 can detect DNA damage. If DNA is damaged, p53 can either trigger DNA repair mechanisms or, if the damage is too severe, initiate apoptosis (programmed cell death) to eliminate the damaged cell. With a broken p53, damaged cells are not repaired or eliminated. These cells can then undergo uncontrolled cell division (a key feature of cancer) as the cell cycle checkpoints that p53 helps to regulate are no longer functioning properly. Over time, the accumulation of these abnormal, dividing cells can lead to the formation of a tumor. Glossary words like "tumor suppressor", "DNA damage", "apoptosis", and "cell cycle" can be used here. For example: "The p53 protein is a vital tumor suppressor. When p53 is broken (mutated), it loses its ability to respond to DNA damage. Normally, upon detecting DNA damage, p53 would either activate DNA repair processes or induce apoptosis to get rid of the damaged cell. Without functional p53, damaged cells bypass these safety mechanisms and proceed through the cell cycle, undergoing uncontrolled cell division. This uncontrolled division of damaged cells eventually leads to the formation of a tumor, as the normal regulatory checks on cell growth are disabled."

Answer:

To explain how a broken p53 leads to cancer: The p53 protein is a critical tumor suppressor. A broken (mutated/non - functional) p53 loses its ability to respond to DNA damage. Normally, p53 detects DNA damage and can trigger DNA repair or apoptosis (programmed cell death) to eliminate damaged cells. Without functional p53, damaged cells avoid these regulatory processes and progress through the cell cycle, undergoing uncontrolled cell division. Over time, the accumulation of these abnormally dividing cells forms a tumor, as the cell cycle checkpoints regulated by p53 are non - operational. (Glossary words used: tumor suppressor, DNA damage, apoptosis, cell cycle)