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Crumbs Affects Protein Dynamics In Anterior Regions Of The Developing Drosophila Embryo

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  • João Firmino
  • Jean-Yves Tinevez
  • Elisabeth Knust

Abstract

Maintenance of apico-basal polarity is essential for epithelial integrity and requires particular reinforcement during tissue morphogenesis, when cells are reorganised, undergo shape changes and remodel their junctions. It is well established that epithelial integrity during morphogenetic processes depends on the dynamic exchange of adherens junction components, but our knowledge on the dynamics of other proteins and their dynamics during these processes is still limited. The early Drosophila embryo is an ideal system to study membrane dynamics during morphogenesis. Here, morphogenetic activities differ along the anterior-posterior axis, with the extending germband showing a high degree of epithelial remodelling. We developed a Fluorescence Recovery After Photobleaching (FRAP) assay with a higher temporal resolution, which allowed the distinction between a fast and a slow component of recovery of membrane proteins during the germband extension stage. We show for the first time that the recovery kinetics of a general membrane marker, SpiderGFP, differs in the anterior and posterior parts of the embryo, which correlates well with the different morphogenetic activities of the respective embryonic regions. Interestingly, absence of crumbs, a polarity regulator essential for epithelial integrity in the Drosophila embryo, decreases the fast component of SpiderGFP and of the apical marker Stranded at Second-Venus specifically in the anterior region. We suggest that the defects in kinetics observed in crumbs mutant embryos are the first signs of tissue instability in this region, explaining the earlier breakdown of the head epidermis in comparison to that of the trunk, and that diffusion in the plasma membrane is affected by the absence of Crumbs.

Suggested Citation

  • João Firmino & Jean-Yves Tinevez & Elisabeth Knust, 2013. "Crumbs Affects Protein Dynamics In Anterior Regions Of The Developing Drosophila Embryo," PLOS ONE, Public Library of Science, vol. 8(3), pages 1-10, March.
  • Handle: RePEc:plo:pone00:0058839
    DOI: 10.1371/journal.pone.0058839
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    References listed on IDEAS

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    1. Milena Pellikka & Guy Tanentzapf & Madalena Pinto & Christian Smith & C. Jane McGlade & Donald F. Ready & Ulrich Tepass, 2002. "Crumbs, the Drosophila homologue of human CRB1/RP12, is essential for photoreceptor morphogenesis," Nature, Nature, vol. 416(6877), pages 143-149, March.
    2. Claire Bertet & Lawrence Sulak & Thomas Lecuit, 2004. "Myosin-dependent junction remodelling controls planar cell intercalation and axis elongation," Nature, Nature, vol. 429(6992), pages 667-671, June.
    3. Matteo Rauzi & Pierre-François Lenne & Thomas Lecuit, 2010. "Planar polarized actomyosin contractile flows control epithelial junction remodelling," Nature, Nature, vol. 468(7327), pages 1110-1114, December.
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