Related Experiment Videos
Characterization of murine A-raf, a new oncogene related to the v-raf oncogene
Abstract:
A 1.6-kilobase cDNA (A-raf) has been isolated from a murine spleen cDNA library which encodes part of a protein related to the raf oncogene. Its amino acid sequence has 85% homology to raf in a central portion of 100 amino acids. In contrast to raf, A-raf shows a highly restricted tissue distribution of expression, with highest levels observed in epididymis, followed by intestine. When incorporated into a retrovirus, the resulting gag-A-raf fusion gene causes transformation in vitro and induces tumors in newborn mice. Thus, A-raf represents a new proto-oncogene. Transformation by A-raf is independent of ras gene function, as is the case for raf and mos but not other oncogenes.
Insights
Researchers discovered a new proto-oncogene, A-raf, from mouse spleen. This gene, related to the raf oncogene, can cause cell transformation and induce tumors in mice, highlighting its oncogenic potential.
Area of Science:
- Molecular Biology
- Oncogenesis
- Gene Expression Analysis
Background:
- The raf oncogene family plays a crucial role in cellular signaling pathways.
- Understanding novel related genes is essential for cancer research.
Purpose of the Study:
- To identify and characterize novel genes related to the raf oncogene.
- To investigate the oncogenic potential of the newly identified A-raf gene.
Main Methods:
- Isolation of cDNA from a murine spleen library.
- Sequence homology analysis comparing A-raf to known raf oncogenes.
- In vitro transformation assays and in vivo tumor induction studies in newborn mice.
Main Results:
- A 1.6-kilobase cDNA, designated A-raf, was isolated, showing 85% amino acid homology to raf in a key region.
- A-raf exhibits restricted tissue expression, predominantly in the epididymis and intestine.
- Retroviral expression of gag-A-raf induced cellular transformation in vitro and tumor formation in vivo.
- A-raf-mediated transformation was independent of ras gene function.
Conclusions:
- A-raf represents a novel proto-oncogene with significant homology to raf.
- The restricted tissue expression and oncogenic activity of A-raf warrant further investigation.
- A-raf-mediated transformation provides insights into oncogenic signaling pathways independent of ras.