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Neuralized (neur) is a neurogenic mutant of Drosophila in which many signaling events mediated by the Notch (N) receptor are disrupted. Here, we analyze the role of neur during eye development. Neur is required in a cell-autonomous fashion to restrict R8 and other photoreceptor fates and is involved in lateral inhibition of interommatidial bristles but is not required for induction of the cone cell fate. The latter contrasts with the absolute requirement for Suppressor of Hairless and the Enhancer of split-Complex for cone cell induction. Using gain-of-function experiments, we further demonstrate that ectopic wild-type and truncated Neur proteins can interfere with multiple N-controlled aspects of eye development, including both neur-dependent and neur-independent processes.
The Drosophila gene neuralized (neur) has long been recognized to be essential for the proper execution of a wide variety of processes mediated by the Notch (N) pathway, but its role in the pathway has been elusive. In this report, we present genetic and biochemical evidence that Neur is a RING-type, E3 ubiquitin ligase. Next, we show that neur is required for proper internalization of Dl in the developing eye. Finally, we demonstrate that ectopic Neur targets Dl for internalization and degradation in a RING finger-dependent manner, and that the two exist in a physical complex. Collectively, our data indicate that Neur is a ubiquitin ligase that positively regulates the N pathway by promoting the endocytosis and degradation of Dl.
The authors summarize the results of patients who had hepatectomy for hepatocellular carcinoma over a 22-year period.
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