Journal
JOURNAL OF CELL BIOLOGY
Volume 215, Issue 5, Pages 649-665Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.201605093
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Funding
- Ministry of Education, Culture, Sports, Science and Technology program Promotion of Environmental Improvement for Independence of Young Researchers under the Special Coordination Funds for Promoting Science and Technology
- Japan Society for the Promotion of Science KAKENHI [26291039, 16H01384, 16H01198, 15K18501, 16K18514]
- Yujin Memorial grant (Niigata University School of Medicine)
- Sumitomo Foundation
- Astellas Foundation for Research on Metabolic Disorders
- Takeda Science Foundation
- Grants-in-Aid for Scientific Research [16H01384, 16H01198, 15K18501, 16H01200, 16K07274, 26291039, 16K18514, 15H04371] Funding Source: KAKEN
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Mitophagy is thought to play an important role in mitochondrial quality control. Mitochondrial division is believed to occur first, and autophagosome formation subsequently occurs to enwrap mitochondria as a process of mitophagy. However, there has not been any temporal analysis of mitochondrial division and autophagosome formation in mitophagy. Therefore, the relationships among these processes remain unclear. We show that the mitochondrial division factor Dnm1 in yeast or Drp1 in mammalian cells is dispensable for mitophagy. Autophagosome formation factors, such as FIP200, ATG14, and WIPIs, were essential for the mitochondrial division for mitophagy. Live-cell imaging showed that isolation membranes formed on the mitochondria. A small portion of the mitochondria then divided from parental mitochondria simultaneously with the extension of isolation membranes and autophagosome formation. These findings suggest the presence of a mitophagy process in which mitochondrial division for mitophagy is accomplished together with autophagosome formation.
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