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Imaging mitophagy in the fruit fly.
Autophagy 2018
Loss-of-function mutations in the genes encoding PRKN/parkin and PINK1 cause autosomal recessive Parkinson disease (PD). Seminal work in Drosophila revealed that loss of park/parkin and Pink1 causes prominent mitochondrial pathology in flight muscle and, to a lesser extent, in dopaminergic neurons. Subsequent studies in cultured mammalian cells discovered a crucial role for PRKN/PARK2 and PINK1 in selective macroautophagic removal of mitochondria (mitophagy). However, direct evidence for the existence of a PINK1-PRKN/PARK2-mediated mitophagy pathway in vivo is still scarce. Recently, we engineered Drosophila that express the mitophagy reporter mt-Keima. We demonstrated that mitophagy occurs in flight muscle cells and dopaminergic neurons in vivo and increases with aging. Moreover, this age-dependent rise depends on park and Pink1. Our data also suggested that some aspects of the mitochondrial phenotype of park- and Pink1-deficient flies are independent of the mitophagy defect, and that park and Pink1 may have multiple functions in the regulation of the integrity of these organelles. Here, we discuss implications of these findings as well as possible future applications of the mt-Keima fly model.
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