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Published on : Jan 08, 2015
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Slide 1 - Yeast Signal Transduction Lab Saccharomyces cerevisiae
Slide 2 - Yeast are… Eukaryotes Single celled organisms Kingdom Fungi Commonly used in biological experiments Also used in commercial applications such as bread and wine preparation
Slide 3 - Fungi vs. Bacteria
Slide 4 - Haploid Strains of Yeast MAT a Release “a factor” pheromones Have receptors for a factor MAT a Release a factor pheromones Have receptors for “a factor”
Slide 5 - Yeast Mating When the appropriate factors are released, a MATa and MAT a cell can mate The binding of the pheromone to the receptor causes a signal transduction pathway to be activated. Cells start to grow towards one another– they shmoo!
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Slide 10 - Diploid vs. Haploid What are the advantages of being diploid? 2 copies of every gene Allows you to compensate for a “bad” gene
Slide 11 - Growth of Yeast YED media Complete media Any yeast should be able to grow on it. MV media Minimal media Lacks some nutrients that yeast might need If a yeast cell can’t make these nutrients themselves, they can’t grow on MV media
Slide 12 - Yeast mutants Some yeast contain mutations that do not allow them to produce specific compounds = auxotrophic When a yeast mutant is auxotrophic for a specific compound, it will be unable to grow on MV media.
Slide 13 - Yeast mutants (continued) In order for an auxotrophic yeast to grow The compound has to be added to the media OR The yeast must mate with another yeast strain that can complement it (so it can make the compound) = complementation
Slide 14 - Lab Experiment Week 1: Mate haploid yeast and observe growth on MV media (to show complementation), observe shmooing Week 2: Determine the defect in haploid yeast strains through mating and complementation on MV media
Slide 15 - Your homework: Study for the Pre Lab Quiz Set up lab notebook: Write a SPECIFIC title Write an Intro (2-5 sentences) Paste in procedure Make a flowchart for EACH page of the procedure