Piekny, Alisa J and Johnson, Jacque-Lynne F. and Cham, Gwendolyn D. (2003) The Caenorhabditis elegans nonmuscle myosin genes nmy-1 and nmy-2 function as redundant components of the let-502/Rho-binding kinase and mel-11/myosin phosphatase pathway during embryonic morphogenesis. Development, 130 (23). pp. 5695-5704. ISSN 0950-1991
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Official URL: http://dx.doi.org/10.1242/dev.00807
Rho-binding kinase and the myosin phosphatase targeting subunit regulate nonmuscle contractile events in higher eukaryotes. Genetic evidence indicates that the C. elegans homologs regulate embryonic morphogenesis by controlling the actin-mediated epidermal cell shape changes that transform the spherical embryo into a long, thin worm. LET-502/Rho-binding kinase triggers elongation while MEL-11/myosin phosphatase targeting subunit inhibits this contractile event. We describe mutations in the nonmuscle myosin heavy chain gene nmy-1 that were isolated as suppressors of the mel-11 hypercontraction phenotype. However, a nmy-1 null allele displays elongation defects less severe than mutations in let-502 or in the single nonmuscle myosin light chain gene mlc-4. This results because nmy-1 is partially redundant with another nonmuscle myosin heavy chain, nmy-2, which was previously known only for its role in anterior/posterior polarity and cytokinesis in the early embryo. At the onset of elongation, NMY-1 forms filamentous-like structures similar to actin, and LET-502 is interspersed with these structures, where it may trigger contraction. MEL-11, which inhibits elongation, is initially cytoplasmic. In response to LET-502 activity, MEL-11 becomes sequestered away from the contractile apparatus, to the plasma membrane, when elongation commences. Upon completion of morphogenesis, MEL-11 again appears in the cytoplasm where it may halt actin/myosin contraction.
|Divisions:||Concordia University > Faculty of Arts and Science > Biology|
|Authors:||Piekny, Alisa J and Johnson, Jacque-Lynne F. and Cham, Gwendolyn D.|
|Journal or Publication:||Development|
|Date:||01 December 2003|
|Keywords:||C. elegans, Rho-binding kinase, Myosin phosphatase, Nonmuscle myosin, Morphogenesis|
|Deposited By:||DANIELLE DENNIE|
|Deposited On:||30 May 2011 12:45|
|Last Modified:||30 May 2011 12:45|
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