Involvement of the PS03 gene of Saccharomyces cerevisiae in intrachromosomal mitotic recombination and gene amplification.
Using a genetic system of haploid strains of Saccharomyces cerevisiae carrying a duplication of the his4 region on chromosome III, the pso3-1 mutation was shown to decrease the rate of spontaneous mitotic intrachromosomal recombination 2- to 13-fold. As previously found for the rad52-1 mutant, the pso3-1 mutant is specifically affected in mitotic gene conversion. Moreover, both mutations reduce the frequency of spontaneous recombination. However, the two mutations differ in the extent to which they affect recombinations between either proximally or distally located markers on the two his4 heteroalleles. In addition, amplifications of the his4 region were detected in the pso3-1 mutant. We suggest that the appearance of these amplifications is a consequence of the inability of the pso3-1 mutant to perform mitotic gene conversion.
Departamento de Biofisica, Centro de Biotecnologia, UFRGS, Porto Alegre, RS, Brazil.
L B
LB
Meira
N
N
Magaña-Schwencke
D
D
Averbeck
J A
JA
Henriques
D005656:Fungal Proteins / Q000502:physiology*; D005720:Gamma Rays; D005784:Gene Amplification / Q000187:drug effects / Q000528:radiation effects; D005785:Gene Conversion; D005800:Genes, Fungal; D008730:Methoxsalen / Q000494:pharmacology; D008938:Mitosis; D011995:Recombination, Genetic / Q000187:drug effects / Q000528:radiation effects; D012091:Repetitive Sequences, Nucleic Acid; D012441:Saccharomyces cerevisiae / Q000235:genetics*
D005656:Fungal Proteins; D008730:Methoxsalen