Coordination of mitophagy and mitochondrial biogenesis during ageing in C. elegans.
Level 5 - mechanism / opinion, no new human data
Mechanistic bench and animal model study in C. elegans without human data
PubMed 25896323 · doi:10.1038/nature14300
What was done
Investigated the molecular mechanisms coordinating selective mitochondrial degradation (mitophagy) and mitochondrial biogenesis in Caenorhabditis elegans, focusing on the mitophagy mediator DCT-1 and retrograde signaling mediated by the transcription factor SKN-1 under stress conditions and during ageing.
What was found
The abstract reports no numbers. Mitophagy impairment compromised stress resistance and induced mitochondrial retrograde signalling through SKN-1, which upregulated both mitochondrial biogenesis genes and DCT-1-mediated mitophagy. During ageing, uncoupling of this homeostatic feedback loop led to an overproliferation of damaged mitochondria and cellular functional decline.
Why it matters
Identifies a homeostatic feedback loop coupling mitochondrial degradation to biogenesis, offering a mechanistic model for how mitochondrial quality control fails during ageing.
Limits
Conducted entirely in the invertebrate model C. elegans without mammalian or human validation. The abstract reports no sample sizes, effect sizes, or quantitative measurements.
Cited by
- supports In C. elegans, mitophagy and mitochondrial biogenesis are coupled to regulate overall mitochondrial turnover.