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Biogenesis of mitochondria

XLII. Genetic analysis of the control of cellular mitochondrial DNA levels in Saccharomyces cerevisiae

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Summary

The proportion of total cell DNA which is mitochondrial DNA was measured in haploid, diploid and tetraploid strains of S. cerevisiae grown under a standard set of conditions. For all strains tested the mitochondrial DNA level was in the range 16%–25% of total cell DNA. Repeated measurements of the cellular level of mitochondrial DNA in two haploid strains showed that these strains have measurably different cellular mitochondrial DNA levels (17% and 24% of total DNA, respectively) under our conditions. These two grande strains were used to investigate the role of the mitochondrial and nuclear genomes in the regulation of the mitochondrial DNA level. We have shown by genetic analysis that the difference between these two strains is determined by at least two nuclear genes. The mitochondrial genome is not involved in the regulation of cellular mitochondrial DNA levels.

A number of purified petite clones derived from independent spontaneous petite isolates of the grande strain which contained 24% mitochondrial DNA were also studied. The mitochondrial DNA levels in all but one of these petites fell in the range 20–25% of total cell DNA. From these results we conclude that, in general, the mitochondrial DNA level in petite strains is controlled by the same mechanism as operates in grande strains.

We propose a general model for the control of the cellular mitochondrial DNA level, in which the amount of mitochondrial DNA per cell is determined by regulation of the number of mitochondrial DNA molecules per cell. This regulation is mediated through the availability of a set of nuclear coded components, possibly a mitochondrial membrane site, which are required for the replication of mitochondrial DNA.

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Authors and Affiliations

  1. Department of Biochemistry, Monash University, 3168, Clayton, Victoria, Australia

    Ruth M. Hall, Phillip Nagley & Anthony W. Linnane

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  1. Ruth M. Hall
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  2. Phillip Nagley
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  3. Anthony W. Linnane
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Communicated by W. Gajewski

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Hall, R.M., Nagley, P. & Linnane, A.W. Biogenesis of mitochondria. Molec. Gen. Genet. 145, 169–175 (1976). https://doi.org/10.1007/BF00269590

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  • DOI: https://doi.org/10.1007/BF00269590

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