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Mating in yeast. Stressed diploid yeast undergoes meiosis Haploid daughters are either… “a” cells or “ a ” cells A-cells and a -cells mate Only a-cell with a -cell Attracted by pheromones Produce new diploid cell. From http://en.wikipedia.org/wiki/Image:Yeast_Mating.png . .

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mating in yeast
Mating in yeast
  • Stressed diploid yeast undergoes meiosis
  • Haploid daughters are either…
    • “a” cells or
    • “a” cells
  • A-cells and a-cells mate
    • Only a-cell with a-cell
    • Attracted by pheromones
    • Produce new diploid cell

From http://en.wikipedia.org/wiki/Image:Yeast_Mating.png.

© 2005 Prentice Hall Inc. / A Pearson Education Company / Upper Saddle River, New Jersey 07458

the regulation of mating type
The regulation of mating type
  • Distantly related yeast exhibit same differentiation of haploid mating types
  • But use different regulatory elements

From Figure 1 in Rokas, A. (2006) “Different paths to the same end” Nature 443: 401-402.

© 2005 Prentice Hall Inc. / A Pearson Education Company / Upper Saddle River, New Jersey 07458

mutations responsible for regulatory network differences
Mutations responsible for regulatory network differences
  • Small number of mutations can have big impact on gene regulation
  • Example: Mcm1 – a2 protein interaction
    • Mutations in small region of a2 protein account for absence of repression of asgs in some yeast species

From Figure 5 in Tsong, A. et al. (2006) “Evolution of alternative transcriptional circuits with identical logic” Nature 443: 415-420.

© 2005 Prentice Hall Inc. / A Pearson Education Company / Upper Saddle River, New Jersey 07458

evolutionary transitions in the regulatory network
Evolutionary transitions in the regulatory network
  • Comparison of regulatory networks governing yeast mating type suggests…
    • big changes in genotype without…
    • concurrent changes in phenotype
  • However it is possible that there was selective advantage in different regulatory networks despite identical mating type outcome

© 2005 Prentice Hall Inc. / A Pearson Education Company / Upper Saddle River, New Jersey 07458