title: Cortical domain correction repositions the polarity boundary to match the cytokinesis furrow in C. elegans embryos.
abstract: In asymmetrically dividing cells, a failure to coordinate cell polarity with the site of cell division can lead to cell fate transformations and tumorigenesis. Cell polarity in C. elegans embryos is defined by PAR proteins, which occupy reciprocal halves of the cell cortex. During asymmetric division, the boundary between the anterior and posterior PAR domains precisely matches the site of cell division, ensuring exclusive segregation of cell fate. The PAR domains determine the site of cell division by positioning the mitotic spindle, suggesting one means by which cell polarity and cell division might be coordinated. Here, we report that cell polarity and cell division are coordinated through an additional mechanism: the site of cell division repositions the PAR-2 boundary. Galpha-mediated microtubule-cortex interactions appear to direct cortical flows of PAR-2 and myosin toward the site of cell division, which acts as a PAR-2 and myosin sink. Embryos with defects in PAR-2 boundary correction undergo mis-segregation of cortical polarity and cytoplasmic determinants, suggesting that PAR domain correction might help prevent cell fate transformation.
authors.affiliation: Research Institute of Molecular Pathology, Dr Bohr Gasse 7, Vienna, Austria.
authors.forename: Christian
authors.initials: C
authors.lastname: Schenk
authors.forename: Henrik
authors.initials: H
authors.lastname: Bringmann
authors.forename: Anthony A
authors.initials: AA
authors.lastname: Hyman
authors.forename: Carrie R
authors.initials: CR
authors.lastname: Cowan
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D019521:Body Patterning / Q000502:physiology*; D017173:Caenorhabditis elegans / Q000196:embryology* / Q000502:physiology; D029742:Caenorhabditis elegans Proteins / Q000378:metabolism / Q000502:physiology; D002455:Cell Division / Q000502:physiology*; D016764:Cell Polarity / Q000502:physiology*; D002970:Cleavage Stage, Ovum / Q000378:metabolism / Q000502:physiology; D048749:Cytokinesis / Q000502:physiology*; D003595:Cytoplasmic Streaming / Q000502:physiology; D004625:Embryo, Nonmammalian; D046912:Multiprotein Complexes / Q000378:metabolism / Q000502:physiology; D011493:Protein Kinase C / Q000378:metabolism / Q000502:physiology; D017346:Protein Serine-Threonine Kinases; D008941:Spindle Apparatus / Q000378:metabolism
chemical_list: D029742:Caenorhabditis elegans Proteins; D046912:Multiprotein Complexes; C512642:par-6 protein, C elegans; C097238:PAR-3 protein, C elegans; D017346:Protein Serine-Threonine Kinases; C115015:PKC-3 protein; D011493:Protein Kinase C