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Nucleic Acids Research, 1975, Vol. 2, No. 10 1777-1786
© 1975

Articles

Heterogeneity of mitochondrial DNA from Saccharomyces cerevisiae and genetic information for tRNA

G. Baldacci, F. Carnevali, L. Frontali, L. Leoni, G. Macino and C. Palleschi

Centro di Studio per gli Acidi Nucleici del C.N.R., Istituto di Fisiologia Generale, Università di Roma 00100 Roma, Italy

Received August 4, 1975. Mitochondrial DNA from wild-type Saccharomyces cerevisiae and from an "extreme" petite mutant were analyzed by hybridization of several tRNAs on DNA fragments of different buoyant density, obtained by sonication and fractionation on a CsCl gradient. The hybridization patterns show that the genes for tRNAser, tRNAphe, tRNAhis, tRNAval, tRNAileu are present on wild-type mitochondrial DNA, while only genes for tRNAser and tRNAhis are present on petite mitochondrial DNA; moreover the hybridization patterns indicate that these genes are not clustered and suggest that more than one gene might exist for tRNAser and tRNAhis.


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