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Photo of Shai Mulinari. Private photo.

Shai Mulinari

Associate Professor | Senior Lecturer

Photo of Shai Mulinari. Private photo.

DRhoGEF2 and Diaphanous Regulate Contractile Force during Segmental Groove Morphogenesis in the Drosophila Embryo.


  • Shai Mulinari
  • Mojgan Padash
  • Udo Häcker

Summary, in English

Monitoring Editor: Marianne Bronner-Fraser Morphogenesis of the Drosophila embryo is associated with dynamic rearrangement of the Actin cytoskeleton mediated by small GTPases of the Rho family. These GTPases act as molecular switches that are activated by guanine nucleotide exchange factors. One of these factors, DRhoGEF2, plays an important role in the constriction of Actin filaments during pole cell formation, blastoderm cellularization and invagination of the germlayers. Here we show that DRhoGEF2 is equally important during morphogenesis of segmental grooves, which become apparent as tissue infoldings during midembryogenesis. Examination of DRhoGEF2-mutant embryos indicates a role for DRhoGEF2 in the control of cell shape changes during segmental groove morphogenesis. Overexpression of DRhoGEF2 in the ectoderm recruits Myosin II to the cell cortex and induces cell contraction. At groove regression DRhoGEF2 is enriched in cells posterior to the groove that undergo apical constriction indicating that groove regression is an active process. We further show that the Formin Diaphanous is required for groove formation and strengthens cell junctions in the epidermis. Morphological analysis suggests that Dia regulates cell shape in a way distinct from DRhoGEF2. We propose that DRhoGEF2 acts through Rho1 to regulate acto-myosin constriction but not Diaphanous-mediated F-Actin nucleation during segmental groove morphogenesis.


  • Sociology
  • Invertebrate Developmental Biology, Udo Haecker's group

Publishing year







Molecular Biology of the Cell



Document type

Journal article


American Society for Cell Biology


  • Developmental Biology



Research group

  • Invertebrate Developmental Biology, Udo Haecker's group


  • ISSN: 1939-4586