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. 1976 Apr;82(4):645–663. doi: 10.1093/genetics/82.4.645

Genetic Analysis of Petite Mutants of SACCHAROMYCES CEREVISIAE : Transmissional Types

Philip S Perlman 1
PMCID: PMC1213486  PMID: 773749

Abstract

We have studied a number of petite [rho- ] mutants of Saccharomyces cerevisiae induced in a wild-type strain of mitochondrial genotype [ome- CHL R ERYS OLIS1,2,3 PARS] by Berenil and ethidium bromide, all of which have retained two mitochondrial genetic markers, [CHLR] and [ERYS], but have lost all other known markers. Though stable in their ability to retain these markers in their genome, these mutants vary widely among themselves in suppressiveness and in the extent to which the markers are transmitted on crossing to a common wild-type tested strain. In appropriate crosses all of the strains examined in this study demonstrate mitochondrial polarity, and thus have also retained the [ome-] locus in a functional form; however, five different transmissional types were obtained, several of them quite unusual, particularly among the strains originally induced by Berenil. One of the most interesting types is the one that appears to reverse the parental genotypes with [CHLR ERYS] predominating over [CHLS ERYR] in the diploid [rho+] progeny, rather than the reverse, which is characteristic of analogous crosses with [rho+] or other petites. Mutants in this class also exhibited low or no suppressiveness. Since all of the petites reported here are derived from the same wild-type parent, and so have the same nuclear background, we have interpreted the transmissional differences as being due to different intramolecular arrangements of largely common retained sequences.

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Selected References

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