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Accumulation of the Drosophila Torso-like protein at the blastoderm plasma membrane suggests that it translocates from the eggshell

AutorMineo, Alessandro; Furriols, Marc; Casanova, Jordi
Palabras claveDrosophila
MACPF domain
Plasma membrane
Torso
Torso-like
Vitelline membrane
Fecha de publicación24-mar-2015
EditorCompany of Biologists
CitaciónDevelopment 142(7): 1299-1304 (2015)
Resumen© 2015. Published by The Company of Biologists Ltd. The eggshell serves as a depository for proteins that play an important role in early embryonic development. In particular, the Drosophila eggshell is responsible for transferring asymmetries from the egg chamber to specify the regions at both ends of the embryo through the uneven activation of the Torso (Tor) receptor in its membrane. This process relies on the restricted expression of the gene torso-like (tsl) in subpopulations of follicle cells during oogenesis and its protein accumulation at both poles of the eggshell, but it is not known how this signal is transmitted to the embryo. Here, we show that Tsl accumulates at the embryonic plasmamembrane, even in the absence of the Tor receptor. However, during oogenesis, we detected Tsl accumulation only at the eggshell. These results suggest that there is a two-step mechanism to transfer the asymmetric positional cues from the egg chamber into the early embryo: initial anchoring of Tsl at the eggshell as it is secreted, followed by its later translocation to the egg plasma membrane, where it enables Tor receptor activation. Translocation of anchored determinants from the eggshell might then regulate the spatial and temporal control of early embryonic developmental processes.
Versión del editorhttp://dx.doi.org/10.1242/dev.117630
URIhttp://hdl.handle.net/10261/123773
DOI10.1242/dev.117630
Identificadoresdoi: 10.1242/dev.117630
issn: 1477-9129
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