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Functions of the mos oncogene family and associated gene products
Abstract:
The mos oncogene present in Moloney murine sarcoma virus is one of the oldest known oncogenes, yet the identification of its biochemical function both in transformation and as a cellular proto-oncogene has been elusive. Only recently have low levels of c-mos transcripts been detected in a specific group of mouse tissues. The c-mos gene is implicated in tumorigenicity by its activation by the insertion of the intracisternal A particle genome in a mouse plasmacytoma. The murine c-mos gene is capable of oncogenic transformation when placed under the regulatory control of a long terminal repeat. The acquisition of the v-mos gene generated the transformation-competent Moloney murine sarcoma virus and several related strains. Myeloproliferative sarcoma virus is unique among the v-mos containing viruses in its ability to induce splenic foci and myeloproliferation in vivo in addition to the transformation of fibroblasts. The v-mos gene product, termed p37mos, is a cytoplasmic protein recently shown to possess serine kinase activity in immune complexes. Autophosphorylation of the mos gene product is not necessary for its biological activity as exemplified by the protein HT1-MSV which lacks phosphoserine residues. A transcriptional regulatory property has been attributed to the v-mos gene product during infection, which may play an essential role in subsequent transformation.
Insights
The mos oncogene
Area of Science:
- Oncogenomics
- Molecular Biology
- Virology
Background:
- The mos oncogene, identified in Moloney murine sarcoma virus, has long been studied for its role in cell transformation.
- Its precise biochemical function and role as a cellular proto-oncogene remained elusive until recent discoveries.
Purpose of the Study:
- To elucidate the biochemical function of the mos oncogene and its gene product, p37mos.
- To understand the mechanisms by which v-mos confers oncogenic transformation and myeloproliferation.
Main Methods:
- Analysis of c-mos transcript levels in mouse tissues.
- Investigating oncogenic transformation by murine c-mos under regulatory control.
- Characterizing the v-mos gene product (p37mos) for enzymatic activity.
Main Results:
- Low levels of c-mos transcripts were detected in specific mouse tissues.
- The v-mos gene product, p37mos, exhibits serine kinase activity in immune complexes.
- Autophosphorylation of p37mos is not required for its biological activity.
Conclusions:
- The mos gene product possesses serine kinase activity, contributing to its oncogenic potential.
- v-mos may regulate transcription, playing a crucial role in cellular transformation and myeloproliferation induced by viruses like Myeloproliferative sarcoma virus.