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The genes of Saccharomyces cerevisiae coding for the mitochondrial threonine and tryptophan tRNA synthetases and for a putative mitochondrial ribosomal protein have been cloned. These, and the previously cloned gene for a mitochondrial elongation factor, were used to disrupt or partially delete the wild-type chromosomal copies of the genes in the respiratory-competent strain W303. In each case, inactivation of a gene whose product is required for mitochondrial protein synthesis causes an instability in mitochondrial DNA. Although intact mitochondrial genomes are rapidly and quantitatively eliminated in the protein synthesis defective strains, specific rho- genomes can be maintained stably over many generations. These results indicate that mitochondrial protein synthesis is required for the propagation of wild-type mitochondrial DNA in yeast.
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