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Originally published as MBC in Press, 10.1091/mbc.E08-08-0879 on October 15, 2008

Vol. 20, Issue 1, 245-255, January 1, 2009

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Putting the Brake on FEAR: Tof2 Promotes the Biphasic Release of Cdc14 Phosphatase during Mitotic Exit

William G. Waples, Charly Chahwan, Marta Ciechonska, and Brigitte D. Lavoie

Department of Molecular Genetics, University of Toronto, Toronto, ON M5S 1A8, Canada

Submitted August 27, 2008; Revised October 6, 2008; Accepted October 8, 2008
Monitoring Editor: Kerry S. Bloom

The completion of chromosome segregation during anaphase requires the hypercondensation of the ~1-Mb rDNA array, a reaction dependent on condensin and Cdc14 phosphatase. Using systematic genetic screens, we identified 29 novel genetic interactions with budding yeast condensin. Of these, FOB1, CSM1, LRS4, and TOF2 were required for the mitotic condensation of the tandem rDNA array localized on chromosome XII. Interestingly, whereas Fob1 and the monopolin subunits Csm1 and Lrs4 function in rDNA condensation throughout M phase, Tof2 was only required during anaphase. We show that Tof2, which shares homology with the Cdc14 inhibitor Net1/Cfi1, interacts with Cdc14 phosphatase and its deletion suppresses defects in mitotic exit network (MEN) components. Consistent with these genetic data, the onset of Cdc14 release from the nucleolus was similar in TOF2 and tof2{Delta} cells; however, the magnitude of the release was dramatically increased in the absence of Tof2, even when the MEN pathway was compromised. These data support a model whereby Tof2 coordinates the biphasic release of Cdc14 during anaphase by restraining a population of Cdc14 in the nucleolus after activation of the Cdc14 early anaphase release (FEAR) network, for subsequent release by the MEN.

This was published online ahead of print in MBC in Press (http://www.molbiolcell.org/cgi/doi/10.1091/mbc.E08-08-0879) on October 15, 2008.

Address correspondence to: Brigitte Lavoie (brigitte.lavoie{at}utoronto.ca).






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