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- W2037449743 abstract "To investigate the possibility of inducing specific chromosome loss by centromere deletion in eukaryotic cells, the yeast diploid strain ZG1, carrying three pairs of heterozygous marker genes (CAN1(S)/can1(R), URA3/Deltaura3, hphMX4/HIS1), widely spread on both arms of chromosome V, was constructed. One of the two centromeres V of ZG1 was replaced by the LEU2 gene via the well-established PCR-mediated knockout technique. After DNA transformation, putative yeast colonies that showed loss of heterozygosity (LOH) for the three markers of chromosome V (CAN1(S) URA3 hphMX4) were identified among the colonies selected for leucine prototrophy. Phenotypic tests, colony-PCR and Southern blot analysis of these cells demonstrated the physical loss of the CAN1(s), URA3, and hphMX4 marker genes from the genome. Further tetrad analysis results were consistent with this conclusion; however, four-spore viability indicated a normal chromosome number of these transformants. To verify the diploidy of the selected chromosome V, the HIS1 gene was deleted with a standard KanMX4 knockout DNA cassette. The resulting heterogeneity of the HIS1/KanMX4 markers, together with quantitative PCR and densitometric analysis on chromosome V, confirmed its diploid complement, thereby indicating that an endoreduplication event had taken place. Restitution of diploidy also occurred in MAD2-deleted strains undergoing higher rates of spontaneous chromosome V loss, indicating a more general phenomenon that is undetectable by phenotypic analysis alone." @default.
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- W2037449743 date "2002-03-15" @default.
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- W2037449743 title "Chromosome V loss due to centromere knockout orMAD2-deletion is immediately followed by restitution of homozygous diploidy inSaccharomyces cerevisiae" @default.
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- W2037449743 doi "https://doi.org/10.1002/yea.859" @default.
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