Protein Kinases Specific for Tyrosine Residues and the Role of Tyrosine Phosphorylation of Proteins in Cell Transformation

  • J. Ghysdael


Retroviruses are the etiological agents of various types of neoplasms (sarcomas, carcinomas and leukemias) in many avian and mammalian species (reviewed in ref. 1). On the basis of their pathogenicity in laboratory animals, oncogenic retroviruses have been broadly divided into two classes. Acute viruses induce tumours 15 to 30 days after injection in a susceptible host and are able to transform adequate target cells in vitro. Chronic viruses do not induce morphological transformation in vitro and require long latency periods (months to years depending on the virus-host considered) to induce tumours. This difference in pathogenicity is the result of the presence in the RNA genome of acute retroviruses of specific nucleotide sequences encoding protein unnecessary for viral replication but required for induction and maintenance of in vitro transformation and in vivo oncogenic potential. These transformation-specific sequences are referred to as v-onc genes. Retroviruses v-onc genes show strong sequence homology to specific cellular loci (c-onc). The c-onc genes are evolutionary conserved and are expressed in normal cells, sometimes in a tissue-specific manner.


Tyrosine Phosphorylation Tyrosine Residue Protein Kinase Activity Rous Sarcoma Virus Epidermal Growth Factor Binding 
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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • J. Ghysdael
    • 1
  1. 1.Laboratoire de Chimie Biologique, Département de Biologie MoléculaireUniversité libre de BruxellesRhode St-GenèseBelgium

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