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Gene. 1988 Oct 30;70(2):303-12.

A family of versatile centromeric vectors designed for use in the sectoring-shuffle mutagenesis assay in Saccharomyces cerevisiae.

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Department of Biochemistry, Stanford University School of Medicine, CA 94305.


A simple assay called the sectoring shuffle was developed to monitor the mutational state of essential genes cloned into yeast centromeric plasmids. The essence of this assay is the creation of a conditional phenotype, colony color sectoring, for an essential gene in the absence of conditional thermosensitive or cold-sensitive alleles of that gene. This allows the quick determination of the mutational state of a cloned essential gene by observing its effect on the sectoring phenotype of the tester strain. During the course of this work we developed a family of 20 Escherichia coli-yeast shuttle vectors, pUN plasmids, containing ARS1 CEN4 and a variety of selectable markers as well as the SUP11 gene which can act as a color marker in the proper background. These vectors are compact and have been very useful for the sectoring-shuffle assay and for gene analysis in general. This paper describes these vectors, the sectoring shuffle and several applications of sectoring phenotypes.

[Indexed for MEDLINE]

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