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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

SIN and the art of splitting the fission yeast cell.

The septation initiation network (SIN) triggers the onset of cytokinesis in the fission yeast Schizosaccharomyces pombe by promoting contraction of the medially placed F-actin ring. SIN signaling is regulated by the polo-like kinase plo1p and by cdc2p, the initiator of mitosis, and its activation is co-ordinated with other events in mitosis to ensure that cytokinesis does not begin until chromosomes have been separated. Though the SIN controls the contractile ring, the signal originates from the poles of the mitotic spindle. Recent studies suggest that the spindle pole body may act as a dynamic assembly site for active SIN signaling complexes. In the budding yeast Saccharomyces cerevisiae the counterpart of the SIN, called the MEN, mediates both mitotic exit and cytokinesis, in part through regulating activation of the phosphoprotein phosphatase Cdc14p. Flp1p, the S. pombe ortholog of Cdc14p, is not essential for mitotic exit, but may contribute to an orderly mitosis-G1 transition by regulating the destruction of the mitotic inducer cdc25p.[1]


  1. SIN and the art of splitting the fission yeast cell. Krapp, A., Gulli, M.P., Simanis, V. Curr. Biol. (2004) [Pubmed]
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