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The 2μm plasmid of laboratory yeast strains is a type-1/type-2 hybrid

✍ Scribed by Xiao, Wei; Rank, Gerald H.

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
348 KB
Volume
12
Category
Article
ISSN
0749-503X

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✦ Synopsis

Industrial yeast strains carry one of two homeologous 2pm plasmids designated as type-I or type-2. The 2pm plasmid, Scpl, found in common laboratory strains of Sacrliiiroriijm~ cerevisiae is considered a type-2 plasmid. since the ori, STB, RAF and REPl loci and intergenic sequences of the right-unique region of Scpl are homologous to the corresponding loci in industrial strain type-2 plasmids. However, within both its 599 bp inverted repeats Scpl has 142-bp sequences homologous to the bakers' yeast type-I plasmid. DNA sequence analyses and oligonucleotide hybridizations indicate that the 142-bp insertion in Scpl was probably due to homeologous reconibination between type-I and type-2 plasmids. These results suggest that some of the plasmid and chromosomal sequence polymorphisms seen in laboratory yeast strains result from honieologous recombination in their ancestral breeding stock.

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