Karyotypes of Saccharomyces sensu lato species

Randi Føns Petersen, Torsten Nilsson-Tilgren, Jure Piskur

    Research output: Contribution to journalJournal articleResearchpeer-review


    An improved pulsed-field electrophoresis program was developed to study differently sized chromosomes within the genus Saccharomyces. The number of chromosomes in the type strains was shown to be nine in Saccharomyces castellii and Saccharomyces dairenensis, 12 in Saccharomyces servazzii and Saccharomyces unisporus, 16 in Saccharomyces exiguus and seven in Saccharomyces kluyveri. The sizes of individual chromosomes were resolved and the approximate genome sizes were determined by the addition of individual chromosomes of the karyotypes. Apparently. the genome of S. exiguus, which is the only Saccharomyces sensu late yeast to contain small chromosomes, is larger than that of Saccharomyces cerevisiae. On the other hand, other species exhibited genome sizes that were 10-25% smaller than that of S. cerevisiae. Well-defined karyotypes represent the basis for future genome mapping and sequencing projects, as well as studies of the origin of the modern genomes.
    Original languageEnglish
    JournalInternational Journal of Systematic Bacteriology
    Pages (from-to)1925-1931
    Publication statusPublished - 1999

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