oncogeni

Oncogenes are genes that have the potential to cause cancer. In normal cells, these genes, called proto-oncogenes, play a role in cell growth, division, and survival. However, when a proto-oncogene undergoes a mutation or is amplified, it can become an oncogene. This transformation can lead to uncontrolled cell proliferation, a hallmark of cancer.

Oncogenes function by promoting cell growth and division, even in the absence of appropriate signals. They can do this in several ways, such as by producing excessive amounts of growth factors, which are signaling molecules that stimulate cell division, or by producing abnormal proteins that are constantly active, telling the cell to divide continuously. Some oncogenes can also interfere with the cell's ability to undergo programmed cell death, or apoptosis, allowing damaged cells to survive and multiply.

The activation of oncogenes is a critical step in the development of many cancers. This activation can occur through various mechanisms, including point mutations, chromosomal translocations, and gene amplification. For example, a specific mutation in the RAS gene is found in a large percentage of human cancers. Similarly, the MYC gene can become amplified, leading to an overproduction of the MYC protein and promoting cell growth. Understanding the role of oncogenes is crucial for developing targeted cancer therapies that aim to inhibit the activity of these aberrant genes.