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Cancer-Critical Genes I: Proto-oncogenes01:33

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Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
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Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
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The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
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The ras oncogenes.

C J Marshall1

  • 1Institute of Cancer Research: Royal Cancer Hospital, Chester Beatty Laboratory, London, UK.

Journal of Cell Science. Supplement
|January 1, 1988
PubMed
Summary

Oncogenic p21ras mutations lead to a constitutively active protein, driving cancer development. Understanding its interaction with targets like GTPase activating protein (GAP) is crucial for elucidating cancer signaling pathways.

Area of Science:

  • Molecular biology
  • Cancer research
  • Cell signaling

Background:

  • Oncogenic p21ras mutations are prevalent in human cancers.
  • The active state of p21ras proteins is bound to GTP.
  • Mutations cause constitutive activation, potentially initiating or promoting carcinogenesis.

Purpose of the Study:

  • To investigate the role of p21ras in cancer.
  • To explore the interaction of active p21ras with cellular targets.
  • To elucidate the mechanism of proliferation and transformation signaling.

Main Methods:

  • Analysis of oncogenic p21ras genes.
  • Investigating the GTP-bound state of p21ras proteins.
  • Utilizing genetic experiments to identify effector molecules.

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Main Results:

  • Oncogenic p21ras mutations lead to a constitutively GTP-bound active state.
  • Evidence suggests mutations can occur at various stages of carcinogenesis.
  • Genetic experiments implicate GTPase activating protein (GAP) as a potential effector molecule.

Conclusions:

  • Active GTP-bound p21ras is central to oncogenesis.
  • The precise mechanism of p21ras-GAP interaction in signal transduction requires further elucidation.