Evaluation of PFGE and mtDNA restriction analysis methods to detect genetic diversity of saccharomyces cerevisiae strains associated to vitis vinifera

<p style="text-align: justify;"><strong>Aims</strong>: The aim of this work was realize a comparative study of two different methods of Saccharomycec cerevisiae yeast strain characterization.</p><p style="text-align: justify;"><strong>Methods and results</strong>: Pulsed-field gel electrophoresis analysis (PFGE) and mitochondrial DNA (mtDNA) restriction analysis have been carried out to differentiate strains of Saccharomyces cerevisiae associated to Vitis vinifera musts from different Galicia wineyard (NW Spain). Seventeen strains isolated from wineries from Galicia were used in this study.</p><p style="text-align: justify;"><strong>Conclusion</strong>: The results have showed that although PFGE analysis technique has greater discriminatory power than mtDNA restriction analysis to detect genetic diversity in Saccharomyces cerevisiae, some clones with the same PFGE profile can only be differentiated by mtDNA restriction analysis.</p><p style="text-align: justify;"><strong>Significance and impact of study</strong>: Pulsed-field gel electrophoresis analysis of chromosome (PFGE), by its discriminating power, constitute an ideal technique for the differentiation of Saccharomyces cerevisiae strains in biotechnological industries, however, mitochondrial DNA (mtDNA) restriction analysis is a rapid, simple and less expensive and time-consuming method. The results obtained demonstrate the value of using molecular genetic methods in taxonomic and ecological surveys.</p>

Mitochondrial DNA and isozyme electrophoretic analyses of the endangered Acadian whitefish, Coregonus huntsmani Scott, 1987

Electrophoretic analysis of isozymes and mitochondrial DNA (mtDNA) restriction analysis were used to study the genetic divergence between the Acadian whitefish, Coregonus huntsmani, and members of the subgenera Coregonus (lake whitefish, C. clupeaformis) and Leucichthys (Arctic cisco, C. autumnalis, and lake cisco, C. artedii). Results obtained from both studies demonstrated that the Acadian whitefish is genetically highly distinct from the other coregonines examined. mtDNA restriction analysis revealed that the Acadian whitefish possesses a unique mitochondrial genotype which is divergent from that of the two cisco species or lake whitefish. Twelve of 13 restriction enzymes used were informative in distinguishing the Acadian whitefish from the other species, and species-specific fragment patterns were observed for 10 enzymes. In isozyme analysis of five loci, the Acadian whitefish was monomorphic at two loci for alleles not found in lake whitefish. Acadian whitefish also possessed an additional isozyme at another locus that was not found in lake whitefish and Arctic cisco specimens. This isozyme is unknown from the genetic model for lake whitefish at this locus. These results provided useful genetic markers to identify the Acadian whitefish. They emphasize that the extinction of the species would represent a major loss of both genetic diversity and potential information concerning the contentious phylogeny of coregonine fishes.