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Carbomycin resistance in mouse L cells

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Somatic Cell Genetics

Abstract

A mutant has been isolated from the mouse cell line LM(TK) which is stably resistant to the macrolide antibiotic, carbomycin. Mitochondrial protein synthesis in this mutant was carbomycin resistant and chloramphenicol sensitive. Fusions between carbomycin-resistant and -sensitive cells produced hybrids, most of which were sensitive to 10 μg/ml carbomycin. At 7.5 μg carbomycin/ml, the average population resistance is low initially but increases with time. Carbomycin-resistant cells were enucleated and fused with carbomycin-sensitive cells under a variety of selective regimes designed to allow growth of carbomycin-resistant cytoplasmic hybrids (cybrids). No transfer of carbomycin resistance via the cytoplasm was detected. Karyoplasts from carbomycin-resistant cells showed a low transfer of resistance to 7.5 μg carbomycin/ml in karyoplast-cell fusions. Carbomycin resistance in this mutant is therefore most likely encoded in a nuclear gene.

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Bunn, C.L., Eisenstadt, J.M. Carbomycin resistance in mouse L cells. Somat Cell Mol Genet 3, 611–627 (1977). https://doi.org/10.1007/BF01539069

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  • DOI: https://doi.org/10.1007/BF01539069

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