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First published online 28 February 2006
doi: 10.1242/jcs.02820


Journal of Cell Science 119, 1130-1143 (2006)
Published by The Company of Biologists 2006
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Research Article

The Cdc14p phosphatase affects late cell-cycle events and morphogenesis in Candida albicans

Andrés Clemente-Blanco1, Alberto González-Novo2, Félix Machín3, David Caballero-Lima1, Luis Aragón3, Miguel Sánchez2, Carlos R. Vázquez de Aldana2, Javier Jiménez2 and Jaime Correa-Bordes1,*

1 Departamento de Microbiología, Facultad de Ciencias, Universidad de Extremadura, Avda Elvas SN, 06071, Badajoz, Spain
2 Instituto de Microbiología-Bioquímica, Departamento de Microbiología y Genética, CSIC/Universidad de Salamanca, Campus Miguel de Unamuno, 37007, Salamanca, Spain
3 Cell Cycle Group, Clinical Sciences Centre, Medical Research Council, Imperial College London, W12 0NN, UK

* Author for correspondence (e-mail: jcorrea{at}unex.es)

Accepted 2 December 2005

We have characterized the CDC14 gene, which encodes a dual-specificity protein phosphatase in Candida albicans, and demonstrated that its deletion results in defects in cell separation, mitotic exit and morphogenesis. The C. albicans cdc14{Delta} mutants formed large aggregates of cells that resembled those found in ace2-null strains. In cdc14{Delta} cells, expression of Ace2p target genes was reduced and Ace2p did not accumulate specifically in daughter nuclei. Taken together, these results imply that Cdc14p is required for the activation and daughter-specific nuclear accumulation of Ace2p. Consistent with a role in cell separation, Cdc14p was targeted to the septum region during the M-G1 transition in yeast-form cells. Interestingly, hypha-inducing signals abolished the translocation of Cdc14p to the division plate, and this regulation depended on the cyclin Hgc1p, since hgc1{Delta} mutants were able to accumulate Cdc14p in the septum region of the germ tubes. In addition to its role in cytokinesis, Cdc14p regulated mitotic exit, since synchronous cultures of cdc14{Delta} cells exhibited a severe delay in the destruction of the mitotic cyclin Clb2p. Finally, deletion of CDC14 resulted in decreased invasion of solid agar medium and impaired true hyphal growth.

Key words: Cytokinesis, Cell separation, Mitotic exit, ACE2, HGC1


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