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Assignment of the Chloramphenicol Resistance Gene to Mitochondrial Deoxyribonucleic Acid and Analysis of Its Expression in Cultured Human Cells

Overview
Journal Mol Cell Biol
Specialty Cell Biology
Date 1981 Aug 1
PMID 9279383
Citations 19
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Abstract

The mitochondrial deoxyribonucleic acids (mtDNA's) from human HeLa and HT1080 cells differed in their restriction endonuclease cleavage patterns for HaeII, HaeIII, and HhaI. HaeII digestion yielded a 9-kilobase fragment in HT1080, which was replaced by 4.5-, 2.4-, and 2.1-kilobase fragments in HeLa. HaeIII and HhaI yielded distinctive 1.35- and 0.68-kilobase HeLa fragments. These restriction endonuclease polymorphisms were used as mtDNA markers in HeLa-HT1080 cybrid and hybrid crosses involving the cytoplasmic chloramphenicol resistance mutation was used. mtDNA's were purified and digested with the restriction endonucleases, the fragments were separated on agarose gels, and the bands were detected by ethidium bromide staining and Southern transfer analysis. Three cybrids and four hybrids (four expressing HeLa and three expressing HT1080 chloramphenicol resistance) contained 2- to 10-fold excesses of the mtDNA of the chloramphenicol-resistant parent. One cybrid, which was permitted to segregate chloramphenicol resistance and was then rechallenged with chloramphenicol, had approximately equal proportions of the two mtDNA's. Only one hybrid was discordant. These results indicated that chloramphenicol resistance is encoded in mtDNA and that expression of chloramphenicol resistance is related to the ratio of chloramphenicol-resistant and -sensitive genomes within cells.

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