Cells use a targeted process to clear out worn mitochondria
In short: A review of research on mitophagy, the process cells use to selectively break down mitochondria, describes how outer membrane receptors and ubiquitin tags mark worn-out or excess mitochondria for destruction by autophagosomes. The authors say this quality-control system operates from yeast to humans and keeps mitochondrial numbers and function in check throughout life.
The review links mitophagy to normal processes like early embryonic development and cell differentiation, and notes that problems with it are associated with neurodegeneration, heart failure, cancer and aging. Studies tracking mitophagy in living organisms also found steady, ongoing mitochondrial turnover in many cell types, suggesting a routine housekeeping role rather than an emergency response.
As a review, the paper synthesizes findings from many separate studies rather than presenting new experiments, and doesn't explain whether correcting mitophagy problems would change outcomes for patients.
Why it matters: Understanding how cells dispose of damaged mitochondria could inform research into aging and diseases linked to mitochondrial dysfunction.
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Sources
- Source: Research: Onishi et al. (2021). Molecular mechanisms and physiological functions of mitophagy. The EMBO Journal. · cc-by
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