Published November 13, 2013
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Cinderella story: PI4P goes from precursor to key signaling molecule
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Phosphatidylinositol lipids are signaling molecules involved in nearly all aspects of cellular regulation. Production of phosphatidylinositol 4-phosphate (PI4P) has long been recognized as one of the first steps in generating poly-phosphatidylinositol phosphates involved in actin organization, cell migration, and signal transduction. However, progress over the last decade has brought to light independent roles of cellular PI4P in membrane trafficking and lipid homeostasis. Here, we describe recent advances that reveal the breadth of processes regulated by PI4P, the spectrum of PI4P effectors, and the mechanisms of spatiotemporal control of PI4P that coordinate crosstalk among cellular signaling pathways.
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