A recent report proposing that the dpp stripe (the main source of the protein dpp) is dispensable for Drosophila wing disc growth missed the critical role on growth due to imprecise spatial removal of dpp.
APP interacts with KCC2 to limit the latter from tyrosine-phosphorylation and ubiquitination and thus subsequent degradation, revealing a novel molecular pathway in which APP regulates GABAergic signaling and thus inhibition in the hippocampus.
Amyloid precursor protein expression and accumulation of its intracellular fragment are required for exuberant neurite outgrowth associated with pathological presenilin 1 loss-of-function mutations before the emergence of amyloid burden in mice.
APP mutations that either cause or prevent dementia alter APP metabolism in a complex and opposite fashion, suggesting a link between multiple APP processing events, dementia and ageing-dependent cognitive decline.
Striped expression of Dpp in Drosophila wing precursors leads to graded signalling activity that positions wing veins and, in parallel, promotes growth in a gradient-independent manner by supplying signalling activity above a threshold.