Anterior-enriched filopodia create the appearance of asymmetric membrane microdomains in polarizing C. elegans zygotes - Archive ouverte HAL
Journal Articles Journal of Cell Science Year : 2019

Anterior-enriched filopodia create the appearance of asymmetric membrane microdomains in polarizing C. elegans zygotes

Abstract

The association of molecules within membrane microdomains is critical for the intracellular organization of cells. During polarization of the C. elegans zygote, both polarity proteins and actomyosin regulators associate within dynamic membrane-associated foci. Recently, a novel class of asymmetric membrane-associated structures was described that appeared to be enriched in phosphatidylinositol 4,5-bisphosphate (PIP 2), suggesting that PIP 2 domains could constitute signaling hubs to promote cell polarization and actin nucleation. Here, we probe the nature of these domains using a variety of membrane-and actin cortex-associated probes. These data demonstrate that these domains are filopodia, which are stimulated transiently during polarity establishment and accumulate in the zygote anterior. The resulting membrane protrusions create local membrane topology that quantitatively accounts for observed local increases in the fluorescence signal of membrane-associated molecules, suggesting molecules are not selectively enriched in these domains relative to bulk membrane and that the PIP 2 pool as revealed by PH PLCδ1 simply reflects plasma membrane localization. Given the ubiquity of 3D membrane structures in cells, including filopodia, microvilli and membrane folds, similar caveats are likely to apply to analysis of membrane-associated molecules in a broad range of systems.
Fichier principal
Vignette du fichier
2019-Nate-jcs.pdf (23.35 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive
Loading...

Dates and versions

hal-02372246 , version 1 (20-11-2019)

Identifiers

Cite

Nisha Hirani, Rukshala Illukkumbura, Tom Bland, Greǵoire Mathonnet, Delphine Suhner, et al.. Anterior-enriched filopodia create the appearance of asymmetric membrane microdomains in polarizing C. elegans zygotes. Journal of Cell Science, 2019, ⟨10.1242/jcs.230714⟩. ⟨hal-02372246⟩
159 View
39 Download

Altmetric

Share

More