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[Cancers, oncogenesis and oncogenes]
Abstract:
The carcinogenic transformation depends on the presence of particular genes, the oncogenes, which are, as a matter of fact, normal cellular genes. The oncogenic retro-viruses are mosaic genomes, transducing oncogenes in the infected cells. These genes are expressed: the product has an activity of protein kinase. The expression is increased in the transformed cells, because the oncogenes are either linked to strong viral promoters in the oncogenic viruses, or translocated in the vicinity of immunoglobulin genes in the case of Burkitt lymphoma. Moreover, there is some modifications (punctual mutations or deletions) of the primary sequence of the protein.
Insights
Oncogenes, normal cellular genes, drive cancer by becoming overexpressed or mutated. Oncogenic retroviruses transfer these genes, increasing protein kinase activity and promoting cell transformation.
Area of Science:
- Molecular Biology
- Oncology
- Virology
Context:
- Carcinogenesis involves specific genes called oncogenes, which are derived from normal cellular genes.
- Oncogenic retroviruses carry oncogenes, integrating them into host cells.
Purpose:
- To explain the role of oncogenes in cellular transformation and cancer development.
- To elucidate the mechanisms by which oncogenes become activated and contribute to tumorigenesis.
Summary:
- Oncogenes, normal cellular genes, are critical for carcinogenic transformation.
- Oncogenic retroviruses transduce oncogenes, leading to their expression as protein kinases.
- Increased oncogene expression in transformed cells results from viral promoters or chromosomal translocations, such as in Burkitt lymphoma.
- Mutations and deletions in oncogenes further contribute to their altered function and oncogenic potential.
Impact:
- Understanding oncogene activation is crucial for developing targeted cancer therapies.
- This knowledge aids in identifying biomarkers for cancer diagnosis and prognosis.
- Elucidates the viral and genetic mechanisms underlying oncogenesis.