): Cytokinesis is a fundamental process in all dividing animal cells. However, the mechanisms that regulate and mediate the localized assembly of the F-actin contractile ring, its stable attachment to the cell cortex, and its coordinated disassembly are not known. We have identified mutations in 29 new genes required at different specific stages of cytokinesis during male meiosis in Drosophila. This mutant collection presents an unparalleled opportunity to elucidate the molecular mechanisms that mediate and regulate cytokinesis in animal cells. Assembly of the F-actin contractile ring requires james bond and at least eight other genes. frodo functions to maintain linkage between the constricting acto-myosin ring and anillin at the cell cortex. ftvs, fsco, fun, onr, and bns are required for both cytokinesis and polarized cell outgrowth during spermatid elongation, suggesting a common underlying mechanism. To investigate their stage and mode of action we will determine if the genes are required for assembly or localization of other contractile ring proteins, mid-spindle components, and key actin regulatory molecules such as CDC42 or Arp2/3 complex subunits. To investigate the common mechanism required for cytokinesis and flagellar elongation, we will determine if the fws, fsco, etc. mutations similarly affect F-actin assembly, disassembly, or reorganization or the localization of key actin-associated proteins during cytokinesis and at the tip of elongating spermatids. To elucidate molecular mechanisms of cytokinesis, we will clone selected genes, determine if their protein products are components of the contractile ring, central spindle, or spermatid flagella, test how their localization depends on wild type function of known cytokinesis genes and each other, and test whether they can bind anillin, septins, microtubules or actin, or bundle, sever, or cap microfilaments, or nucleate F-actin assembly in vitro.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM062276-02
Application #
6520370
Study Section
Cell Development and Function Integrated Review Group (CDF)
Program Officer
Deatherage, James F
Project Start
2001-03-01
Project End
2005-02-28
Budget Start
2002-03-01
Budget End
2003-02-28
Support Year
2
Fiscal Year
2002
Total Cost
$187,755
Indirect Cost
Name
Stanford University
Department
Anatomy/Cell Biology
Type
Schools of Medicine
DUNS #
800771545
City
Stanford
State
CA
Country
United States
Zip Code
94305
Giansanti, Maria Grazia; Vanderleest, Timothy E; Jewett, Cayla E et al. (2015) Exocyst-Dependent Membrane Addition Is Required for Anaphase Cell Elongation and Cytokinesis in Drosophila. PLoS Genet 11:e1005632
Fabian, Lacramioara; Wei, Ho-Chun; Rollins, Janet et al. (2010) Phosphatidylinositol 4,5-bisphosphate directs spermatid cell polarity and exocyst localization in Drosophila. Mol Biol Cell 21:1546-55
Robinett, Carmen C; Giansanti, Maria Grazia; Gatti, Maurizio et al. (2009) TRAPPII is required for cleavage furrow ingression and localization of Rab11 in dividing male meiotic cells of Drosophila. J Cell Sci 122:4526-34
Szafer-Glusman, Edith; Giansanti, Maria Grazia; Nishihama, Ryuichi et al. (2008) A role for very-long-chain fatty acids in furrow ingression during cytokinesis in Drosophila spermatocytes. Curr Biol 18:1426-31
Carreno, Sebastien; Kouranti, Ilektra; Glusman, Edith Szafer et al. (2008) Moesin and its activating kinase Slik are required for cortical stability and microtubule organization in mitotic cells. J Cell Biol 180:739-46
Johnstone, Oona; Deuring, Renate; Bock, Ronald et al. (2005) Belle is a Drosophila DEAD-box protein required for viability and in the germ line. Dev Biol 277:92-101
Giansanti, Maria Grazia; Farkas, Rebecca M; Bonaccorsi, Silvia et al. (2004) Genetic dissection of meiotic cytokinesis in Drosophila males. Mol Biol Cell 15:2509-22
Farkas, Rebecca M; Giansanti, Maria Grazia; Gatti, Maurizio et al. (2003) The Drosophila Cog5 homologue is required for cytokinesis, cell elongation, and assembly of specialized Golgi architecture during spermatogenesis. Mol Biol Cell 14:190-200