Cloning and characterization of a thermolabile v-src gene for use in reversible transformation of mammalian cells - PubMed (original) (raw)
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- PMID: 1375718
Cloning and characterization of a thermolabile v-src gene for use in reversible transformation of mammalian cells
A C Maroney et al. Oncogene. 1992 Jun.
Abstract
The use of temperature-sensitive (ts) src mutants for studies of cell transformation and differentiation has been limited by the availability of cloned ts-src genes that are inactivated at temperatures compatible with growth of mammalian cells. In this report, we describe the cloning and characterization of the tsLA90src gene, which displays tight thermal sensitivity at 39.5 degrees C. Nucleotide sequence comparison of tsLA90 and wild-type src genes from the Schmidt-Ruppin subgroup A and D strains of Rous sarcoma virus (RSV) revealed four amino acid differences in tsLA90src. Substitution of one of these residues (Lys-280) from tsLA90src with its wild-type homolog (Glu-280) caused a reversion to a wild-type src phenotype. The cloned tsLA90 gene, designated tsUP1, was introduced into avian and mammalian retroviral vectors. Chicken embryo fibroblasts and immortalized mouse 3T3 cells infected with these viral vectors displayed a temperature-dependent transformed phenotype as assessed by cell morphology, secretion of plasminogen activator, transcriptional activation of the primary response genes, Egr-1 and TIS 10, and stimulation of tyrosine phosphorylation. In addition, chicken myoblasts (infected with RSVtsUP1) showed a temperature-dependent differentiation into myotubes. Thus, this cloned src gene should be ideally suited for inducing reversible transformation and differentiation of mammalian cells in culture.
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