The majority of the c -ras oncogenes obtained from cancerous tissues have mutations in codon 12,

step 1 RAS is a pretty well -studied oncogene in humans. Its function is a GTP ACE, which hydrolyzes GT

The majority of the c -ras oncogenes obtained from cancerous...

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Oncogenes

Oncogenes are mutated versions of normal genes (proto-oncogenes) that, when altered, drive uncontrolled cell proliferation and survival. Their activation is a key event in the transformation of normal cells into cancer cells.

Mutational Hotspots

Mutational hotspots are specific regions within a gene where mutations occur at a higher frequency due to their critical role in protein function. These regions are often highly sensitive to changes, meaning that even single amino acid substitutions can have dramatic effects on protein activity.

Protein Function and Structure of Ras

Ras proteins function as molecular switches in signaling pathways controlling cell growth and differentiation. Specific amino acids encoded by critical codons are integral to its GTPase activity, and mutations at these sites can impair GTP hydrolysis, resulting in a constitutively active protein that continuously drives cell proliferation.

Selective Advantage in Tumorigenesis

Mutations that confer a continuous active state to proteins involved in growth control, such as Ras, provide a selective advantage to cancer cells. This advantage promotes clonal expansion of cells harboring these mutations, explaining why alterations at specific codons are frequently observed in oncogenes from cancerous tissues.

Transcript

Please give Ace some feedback