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Mapping chromosomal genes of Saccharomyces cerevisiae using an improved genetic mapping method.

Authors
  • Wickner, R B
Type
Published Article
Journal
Genetics
Publication Date
Jul 01, 1979
Volume
92
Issue
3
Pages
803–821
Identifiers
PMID: 395022
Source
Medline
License
Unknown

Abstract

A triploid (3n) strain of Saccharomyces cerevisiae was constructed carrying a standard marker on each of chromosomes 1 through XVII in the -/+/+ configuration. This is called a "supertriploid." Meiotic spores from this strain (n + approximately n/2) were mated with a haploid (n) carrying an unmapped mutation. Meiotic analysis of each zygote clone (2n + approximately n/2) produced in this way resulted in elimination of an average of 4.2 chromosomes as the possible location of the unmapped marker. The distribution of extra chromosomes in the 2n + approximately n/2) strains was nearly random. Meiotic segregrants of these crosses carrying the unmapped mutation in the -/+ configuration were then crossed with multiply marked haploid strains to further narrow the possible location of the unmapped mutation to a single chromosome. Scoring of markers by complemention tests was simplified by mating spore clones with mixtures of a and alpha strains, each pair carrying the same set of markers. Using this new, more rapid method ("supertriploid mapping"), eight genes required for the maintenance of the killer plasmid were located on the genetic map of S. cerevisiae.

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