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2016 ; 14
(10
): 2451-62
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gab.com Text
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English Wikipedia
Localized Translation of gurken/TGF-? mRNA during Axis Specification Is
Controlled by Access to Orb/CPEB on Processing Bodies
#MMPMID26947065
Davidson A
; Parton RM
; Rabouille C
; Weil TT
; Davis I
Cell Rep
2016[Mar]; 14
(10
): 2451-62
PMID26947065
show ga
In Drosophila oocytes, gurken/TGF-? mRNA is essential for establishing the future
embryonic axes. gurken remains translationally silent during transport from its
point of synthesis in nurse cells to its final destination in the oocyte, where
it associates with the edge of processing bodies. Here we show that, in nurse
cells, gurken is kept translationally silent by the lack of sufficient Orb/CPEB,
its translational activator. Processing bodies in nurse cells have a similar
protein complement and ultrastructure to those in the oocyte, but they markedly
less Orb and do not associate with gurken mRNA. Ectopic expression of Orb in
nurse cells at levels similar to the wild-type oocyte dorso-anterior corner at
mid-oogenesis is sufficient to cause gurken mRNA to associate with processing
bodies and translate prematurely. We propose that controlling the spatial
distribution of translational activators is a fundamental mechanism for
regulating localized translation.