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Chapter 64 : Yeasts Are Complex . . .

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Abstract:

Microbiologists categorized yeasts as solitary cells simply because this was the form and its relatives adopted when compelled to proliferate in the artificial environment of the shake flask, fermentor, or chemostat. The prevailing view was that yeasts were "planktonic" creatures, teeming populations of individual cells thriving on the nourishing warmth of laboratory glassware. As microbiology progressed, these were the organisms that spawned numerous advances in biochemistry and other specialties. Especially prized was , which provided major insights into the operation of the eukaryotic cell cycle. At the most genuinely elementary level, communication between cells has been known for some years. There are two haploid mating types, producing corresponding pheromones and having surface receptors for the opposite type. Each pheromone arrests the cell cycle of the opposing type. Going beyond this primitive sexuality, Richard Dickinson highlighted the recognition of quorum sensing in . Dickinson also drew attention to research on the production of bicarbonate by during sporulation. This work indicated that the yeast is not a free-living unicellular eukaryote but a social organism, whose diploid cells "tell" others to sporulate. Dickinson made a compelling case for yeasts to be categorized not as free-living unicellular eukaryotes but as "social, colonial organisms with cell-to-cell communication. The "rediscovery" of filamentation in the last decade has been accompanied by recognition that yeasts also thrive as biofilms.

Citation: Dixon B. 2009. Yeasts Are Complex . . ., p 300-304. In Animalcules. ASM Press, Washington, DC. doi: 10.1128/9781555817442.ch64

Key Concept Ranking

Programmed Cell Death
0.8235591
Surface Receptors
0.5710898
Candida albicans
0.5
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References

/content/book/10.1128/9781555817442.chap64
1. Bisset, K. 1950. The Cytology and Life-History of Bacteria. E&S Livingstone, Edinburgh, United Kingdom.
2. Chen, H.,, M. Fujita,, Q. Feng,, J. Clardy,, and G. R. Fink. 2004. Tyrosol is a quorum-sensing molecule in Candida albicans. Proc. Natl. Acad. Sci. USA 101:50485052.
3. Dickinson, J. R. 2005. Are yeasts free-living unicellular eukaryotes? Lett. Appl. Microbiol. 41:445447.
4. Dixon, B.,, and A. H. Rose. 1964. Observations on the fine structure of Saccharomyces cerevisiae as affected by biotin deficiency. J. Gen. Microbiol. 35:411419.
5. Ohkuni, K.,, M. Hayashi,, and I. Yamashita. 1998. Bicarbonate-mediated social communication stimulates meiosis and sporulation of Saccharomyces cerevisiae. Yeast 14:623631.
6. Qi, H.,, T.-K. Li,, D. Kuo,, A. Nur-E-Kamal,, and L. F. Liu. 2003. Inactivation of Cdc13p triggers MEC1-dependent apoptotic signals in yeast. J. Biol. Chem. 278:1513615141.

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