Journal
AUTOPHAGY
Volume 10, Issue 10, Pages 1702-1711Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/auto.32122
Keywords
autophagy; yeast; cell cycle; quiescence; starvation
Categories
Funding
- CPRIT [RP120718-P1]
- NIH [R01CA84254, R01CA109618, R01CA172211, R01CA108947, R01GM053396]
- NATIONAL CANCER INSTITUTE [R01CA084254, R01CA172211, R01CA108947, R01CA109618] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM053396] Funding Source: NIH RePORTER
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In response to starvation, cells undergo increased levels of autophagy and cell cycle arrest but the role of autophagy in starvation-induced cell cycle arrest is not fully understood. Here we show that autophagy genes regulate cell cycle arrest in the budding yeast Saccharomyces cerevisiae during nitrogen starvation. While exponentially growing wild-type yeasts preferentially arrest in G(1)/G(0) in response to starvation, yeasts carrying null mutations in autophagy genes show a significantly higher percentage of cells in G(2)/M. In these autophagy-deficient yeast strains, starvation elicits physiological properties associated with quiescence, such as Snf1 activation, glycogen and trehalose accumulation as well as heat-shock resistance. However, while nutrient-starved wild-type yeasts finish the G(2)/M transition and arrest in G(1)/G(0), autophagy-deficient yeasts arrest in telophase. Our results suggest that autophagy is crucial for mitotic exit during starvation and appropriate entry into a G(1)/G(0) quiescent state.
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