The β-tubulin gene as a molecular phylogenetic marker for classification and discrimination of the Saccharomyces sensu stricto complex
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- Huang, CH., Lee, FL. & Tai, CJ. Antonie van Leeuwenhoek (2009) 95: 135. doi:10.1007/s10482-008-9296-1
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The Saccharomycessensu stricto complex comprises seven very closely related species. In this study, we compared the use of two different phylogenetic markers, the 26S rDNA and β-tubulin genes, for discriminating phylogenetic relationships among Saccharomyces sensu stricto strains using sequencing as well as RFLP methods. The average sequence similarity for the β-tubulin gene (90.0%) among seven strains was significantly less than that for 26S rDNA (98.6%). This result demonstrates that β-tubulin gene sequences provided higher resolution than 26S rDNA sequences. Species-specific restriction profiles of the Saccharomyces strains were obtained by cutting them with the Tsp509I enzyme. Our data indicate that phylogenetic relationships between these strains are best resolved using sequencing or RFLP analysis of the β-tubulin gene.