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About This Document: The sticky/citron kinase protein is a conserved regulator of cell-cycle progression from invertebrates to humans. While this kinase is essential for completion of cytokinesis, sticky/citron kinase phenotypes disrupting neurogenesis and cell differentiation suggest additional non-cell-cycle functions. However, it is not known whether these phenotypes are an indirect consequence of sticky mutant cell-cycle defects or whether they define a novel function for this kinase. We have isolated a temperature-sensitive allele of the Drosophila sticky gene and we show that sticky/citron kinase is required for histone H3-K9 methylation, HP1 localization, and heterochromatin-mediated gene silencing. sticky genetically interacts with Argonaute 1 and sticky mutants exhibit context-dependent Su(var) and E(var) activity. These observations indicate that sticky/citron kinase functions to regulate both actin-myosin-mediated cytokinesis and epigenetic gene silencing, possibly linking cell-cycle progression to heterochromatin assembly and inheritance of gene expression states. [PUBLICATION ABSTRACT]

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Drosophila sticky/citron kinase Is a Regulator of Cell-Cycle Progression, Genetically Interacts With Argonaute 1 and Modulates Epigenetic Gene Silencing

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Copyright Ó 2008 by the Genetics Society of America

DOI: 10.1534/genetics.107.082511

Drosophila sticky/citron kinase Is a Regulator of Cell-Cycle

Progression, Genetically Interacts With Argonaute 1 and

Modulates Epigenetic Gene Silencing

Sarah J. Sweeney, Paula Campbell and Giovanni Bosco1

Department of Molecular and Cellular Biology, University of Arizona, Tucson, Arizona 85721

Manuscript received September 28, 2007

Accepted for publication December 30, 2007

ABSTRACT

The sticky/citron kinase protein is a conserved regulator of cell-cycle progression from invertebrates to

humans. While this kinase is essential for completion of cytokinesi

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