PINK1 and parkin shape the organism-wide distribution of a deleterious mitochondrial genome

作者：Arnaud Ahier, Chuan-Yang Dai, Ina Kirmes, Nadia Cummins, Grace Ching Ching Hung, Jürgen Götz, Steven Zuryn · 发表于：Cell Reports · 年份：2021 · DOI：10.1016/j.celrep.2021.109203 · 被引用次数：47 · 研究领域：Mitochondrial Function and Pathology、Autophagy in Disease and Therapy、Parkinson's Disease Mechanisms and Treatments

In multiple species, certain tissue types are prone to acquiring greater loads of mitochondrial genome (mtDNA) mutations relative to others, but the mechanisms that drive these heteroplasmy differences are unknown. We find that the conserved PTEN-induced putative kinase (PINK1/PINK-1) and the E3 ubiquitin-protein ligase parkin (PDR-1), which are required for mitochondrial autophagy (mitophagy), underlie stereotyped differences in heteroplasmy of a deleterious mitochondrial genome mutation (ΔmtDNA) between major somatic tissues types in Caenorhabditis elegans. We demonstrate that tissues prone to accumulating ΔmtDNA have lower mitophagy responses than those with low mutation levels. Moreover, we show that ΔmtDNA heteroplasmy increases when proteotoxic species that are associated with neurodegenerative disease and mitophagy inhibition are overexpressed in the nervous system. These results suggest that PINK1 and parkin drive organism-wide patterns of heteroplasmy and provide evidence of a causal link between proteotoxicity, mitophagy, and mtDNA mutation levels in neurons.