Summary
Under selective growth conditions a revertant of mouse cells, defective in hypoxanthine phosphoribosyltransferase activity (HPRT, EC-No. 2.4.2.8), was isolated, which contained an electrophoretically abnormal form of HPRT activity. The specific HPRT activity in crude extracts of the revertant cells is about 30% of the level determined in normal wild type cells. The variant HPRT reacts with antiserum against normal mouse HPRT but the rate of heat inactivation of the variant activity is different from the wild type form. By isozyme and karyotype analyses of somatic cell hybrids between the revertant mouse cells and Chinese hamster cells we found that the abnormal HPRT activity is coded for by the mouse X-chromosome as expected for a mutation in the structural HPRT gene.
DNA has been purified from the abnormal HPRT revertant cells and incubated with mouse A9 cells (HPRT-). After growth in selective medium one clone was isolated which expressed the electrophoretically abnormal form of HPRT. Six clones showed the normal form of HPRT due to reversion of the defective HRRT locus in A9 cells. This result indicates DNA-mediated transfer of the mouse HPRT gene at a frequency of about 0.5×10-7. A similar frequency has been found for transfer of the variant HPRT locus via isolated metaphase chromosomes to A9 recipient cells. When placed in non-selective media the DNA-mediated transferent cells gradually lost their ability to express the HPRT transgenome at a rate of about 6% per average cell generation.
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Communicated by J. Schell
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Willecke, K., Klomfaß, M., Mierau, R. et al. Intraspecies transfer via total cellular DNA of the gene for hypoxanthine phosphoribosyltransferase into cultured mouse cells. Molec. gen. Genet. 170, 179–185 (1979). https://doi.org/10.1007/BF00337794
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DOI: https://doi.org/10.1007/BF00337794