Related Experiment Videos
Characterization of four novel ras-like genes expressed in a human teratocarcinoma cell line
G T Drivas1, A Shih, E Coutavas
1Department of Biochemistry, New York University School of Medicine, New York 10016.
Abstract:
A mixed-oligonucleotide probe was used to identify four ras-like coding sequences in a human teratocarcinoma cDNA library. Two of these sequences resembled the rho genes, one was closely related to H-, K-, and N-ras, and one shared only the four sequence domains that define the ras gene superfamily. Homologs of the four genes were found in genomic DNA from a variety of mammals and from chicken. The genes were transcriptionally active in a range of human cell types.
Insights
Researchers identified four ras-like coding sequences in human cells using a mixed-oligonucleotide probe. These genes, similar to rho and ras families, are present across species and active in human tissues.
Area of Science:
- Molecular Biology
- Genetics
- Human Genomics
Background:
- The ras gene superfamily plays crucial roles in cellular signaling pathways.
- Understanding novel ras-like sequences is essential for deciphering their biological functions.
Purpose of the Study:
- To identify and characterize novel ras-like coding sequences in human teratocarcinoma cells.
- To investigate the evolutionary conservation and transcriptional activity of these newly identified genes.
Main Methods:
- Utilized a mixed-oligonucleotide probe for screening a human teratocarcinoma cDNA library.
- Sequence analysis to determine homology to known ras and rho gene families.
- Cross-species genomic DNA hybridization and analysis of human cell type transcriptomes.
Main Results:
- Identified four distinct ras-like coding sequences.
- Two sequences showed resemblance to rho genes; one was closely related to H-, K-, and N-ras.
- One sequence contained only the conserved ras gene superfamily domains.
- Homologs were detected in diverse mammalian species and chicken.
- All four identified genes were transcriptionally active in various human cell types.
Conclusions:
- Discovered novel ras-like genes in human teratocarcinoma, expanding the known ras superfamily.
- Demonstrated evolutionary conservation of these genes across vertebrates.
- Confirmed the active transcription of these genes in human cells, suggesting functional relevance.