Modulation ofgurkenTranslation by Insulin/TOR Signaling in Drosophila
Modulation ofgurkenTranslation by Insulin/TOR Signaling in Drosophila
Localized Gurken translation specifies the anterior/posterior and dorsal/ventral axes of the developing Drosophila oocyte. spindle-class females lay ventralized eggs resulting from inefficient grk translation. This phenotype is thought to result from inhibition of the Vasa RNA helicase. In a screen for modifiers of the eggshell phenotype in spn-B flies, we identified a mutation in the lnk gene. We show that lnk mutations restore Grk expression, but do not suppress the persistence of double strand breaks nor other spn-B phenotypes. This suppression does not affect Egfr directly, but rather overcomes the translational block of grk messages seen in spindle mutants. Lnk was recently identified as a component of the insulin/insulin-like growth factor signaling (IIS) / TOR pathway. Interestingly, direct inhibition of TOR with rapamycin can also suppress the ventralized eggshell phenotype in spn-B or vasa mutant mothers. When dietary protein is inadequate, reduced IIS/TOR activity inhibits cap-dependent translation by promoting the activity of the translation inhibitor eIF4E binding protein. We hypothesize that reduced TOR activity promotes grk translation independent of the canonical Vasa/cap-dependent mechanism. This model suggests a means by which flies can maintain the translation of developmentally important transcripts during periods of nutrient limitation when bulk cap-dependent translation is repressed.
- State University of New York at Potsdam United States
- Howard Hughes Medical Institute United States
- College of New Jersey United States
- SUNY Fredonia United States
Male, RNA Caps, TOR Serine-Threonine Kinases, Down-Regulation, Transforming Growth Factor alpha, Animals, Genetically Modified, Drosophila melanogaster, Protein Biosynthesis, Animals, Drosophila Proteins, Insulin, Female, RNA Helicases, Signal Transduction
Male, RNA Caps, TOR Serine-Threonine Kinases, Down-Regulation, Transforming Growth Factor alpha, Animals, Genetically Modified, Drosophila melanogaster, Protein Biosynthesis, Animals, Drosophila Proteins, Insulin, Female, RNA Helicases, Signal Transduction
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