Cell cleanup limits faulty mitochondrial DNA inheritance in worms
In worm experiments, reproductive cells selectively removed mitochondria rich in faulty DNA before fertilization, limiting its transmission across generations.
Limit: The reduction in mutant DNA inheritance is reported without a numerical effect size
Edited by Boris Djordjevic · AgingResearch.News
In Caenorhabditis elegans worms, laboratory experiments examined how mothers passed on mitochondrial DNA, the genetic material carried by cells’ energy-producing structures. The researchers studied mitophagy, the process by which cells remove mitochondria. They found that this cleanup selectively removed mitochondria rich in mutant DNA from mothers’ reproductive cells before eggs were fertilized.
Mitophagy in reproductive cells declined as worms aged, leaving offspring with a higher burden of mutant mitochondrial DNA. Boosting this cleanup in reproductive cells restricted the transmission of harmful mitochondrial DNA. The effect compounded across generations, ultimately eliminating the faulty genomes from the maternal line.
Why it matters
Preserving mitochondrial genetic information across generations raises a question about aging: how do age-related changes in reproductive cells affect what offspring inherit?
Caveats
The evidence comes from laboratory experiments in worms, not people. The report is a preprint and has not been peer-reviewed.
The paper
Germline mitophagy selectively eliminates deleterious mitochondrial DNA across generations
The University of Queensland
bioRxiv, Jun 25, 2026, Open access, Preprint, not peer-reviewed
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