title: Transformation of mouse fibroblasts to methotrexate resistance by a recombinant plasmid expressing a prokaryotic dihydrofolate reductase.
abstract: A recombinant plasmid has been constructed for the expression of inserted DNA sequences coding for polypeptide chains using the simian virus 40 early promoter and splicing and polyadenylylation signals from the rabbit beta-globin gene. The coding regions for two prokaryotic methotrexate-resistant dihydrofolate reductases were introduced into the expression vector. When mouse fibroblasts were exposed to these recombinant plasmids, it was possible to select methotrexate-resistant clones that had integrated the plasmids and produced a chimeric RNA coding for the prokaryotic enzyme.
mesh_terms: D000818:Animals; D001483:Base Sequence; D004262:DNA Restriction Enzymes; D004274:DNA, Recombinant / Q000378:metabolism*; D004351:Drug Resistance; D005796:Genes; D005914:Globins / Q000235:genetics; D007739:L Cells / Q000378:metabolism; D008727:Methotrexate / Q000494:pharmacology*; D051379:Mice; D010957:Plasmids; D011817:Rabbits; D013762:Tetrahydrofolate Dehydrogenase / Q000235:genetics*; D014158:Transcription, Genetic; D014170:Transformation, Genetic
chemical_list: D004274:DNA, Recombinant; D005914:Globins; D013762:Tetrahydrofolate Dehydrogenase; D004262:DNA Restriction Enzymes; D008727:Methotrexate