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The human c-Ha-ras2 is a processed pseudogene inactivated by numerous base substitutions
Abstract:
The human c-Ha-ras2 gene, one of two known members of the Harvey ras family, is reportedly located on the X-chromosome and has lost introns (1, 2). There has heretofore been no information on its precise gene structure and oncogenic potential. We have determined the nucleotide sequence of the c-Ha-ras2 and demonstrate that it is a processed pseudogene surrounded by several direct repeats and contains numerous base substitutions as well as a notable mutation (AGT at codon 12 of the p21 protein) responsible for oncogenic conversion of the known ras genes (3-8).
Insights
The human c-Ha-ras2 gene, a pseudogene, lacks introns and contains mutations. Notably, it possesses an oncogenic mutation at codon 12, similar to active ras genes.
Area of Science:
- Molecular Biology
- Human Genetics
- Oncogenes
Background:
- The Harvey ras (Ha-ras) gene family includes c-Ha-ras1 and c-Ha-ras2.
- c-Ha-ras2 is reportedly located on the X-chromosome and lacks introns.
- Its precise gene structure and oncogenic potential remain uncharacterized.
Purpose of the Study:
- To determine the nucleotide sequence of the human c-Ha-ras2 gene.
- To elucidate the gene structure and assess its oncogenic potential.
Main Methods:
- Nucleotide sequencing of the c-Ha-ras2 gene.
- Bioinformatic analysis of the sequence for structural features and mutations.
Main Results:
- The c-Ha-ras2 gene is a processed pseudogene.
- It is flanked by direct repeat sequences.
- Numerous base substitutions and a critical mutation (AGT at codon 12 of the p21 protein) were identified.
Conclusions:
- Human c-Ha-ras2 is a non-functional pseudogene.
- The identified mutation at codon 12 mirrors that found in oncogenic ras genes, suggesting potential for oncogenic conversion if functional.
- The presence of direct repeats and base substitutions indicates its pseudogene nature and evolutionary history.