Molecular evidence for an ancient duplication of the entire yeast genome

Article Abstract:

An analysis of the entire yeast genome shows a pattern of gene duplication compatible with the concept that the whole sequence experienced duplication some 100 million years ago. The findings are consistent with Ohno's theory that polyploidy (whole-genome duplication) is an important mechanism for evolutionary novelty. The yeast genome of Saccharomyces cervisiae is thought to be a degenerate tetraplid, different from other unduplicated yeasts because of its capacity to anaerobically ferment sugars to produce ethanol.

Evolution (Biology), Microorganisms, Yeast fungi, Microbial biotechnology, Yeasts (Fungi), Microbiological chemistry, Polyploidy

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Protease helps yeast find mating partners

Article Abstract:

The yeast Saccharomyces cerevisiae chooses a mating partner by detecting mating pheromones in other yeast cells. A cell determines the position of its closest mating partner from pheromone gradients. A study of the process found that the gradient may not point to the direction of the closest partner in the presence of several possible mating partners. Mating pheromone degradation by protease enzymes is shown to assist in aligning the gradient towards the closest partner, increasing the efficiency of mating.

Analysis, Observations, Proteases, Cell research, Cytological research, Pheromones

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