Journal
SCIENCE ADVANCES
Volume 7, Issue 36, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abi8886
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Funding
- European Research Council [ERCStG-714739]
- Elitenetzwerk Bayern through theBiological Physics program
- Deutsche Forschungsgemeinschaft (DFG) [459304237]
- SPP 2202 Priority Program of the Deutsche Forschungsgemeinschaft (DFG) [422857584]
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The study shows that yeast can distinguish between functional and defective mtDNA, promoting the generation of healthier daughter cells. Purifying selection for functional mtDNA occurs in a continuous mitochondrial network, depending on intact cristae morphology.
Mitochondrial genomes (mtDNA) encode essential subunits of the mitochondrial respiratory chain. Mutations in mtDNA can cause a shortage in cellular energy supply, which can lead to numerous mitochondrial diseases. How cells secure mtDNA integrity over generations has remained unanswered. Here, we show that the single-celled yeast Saccharomyces cerevisiae can intracellularly distinguish between functional and defective mtDNA and promote generation of daughter cells with increasingly healthy mtDNA content. Purifying selection for functional mtDNA occurs in a continuous mitochondrial network and does not require mitochondrial fission but necessitates stable mitochondrial subdomains that depend on intact cristae morphology. Our findings support a model in which cristae-dependent proximity between mtDNA and the proteins it encodes creates a spatial sphere of influence, which links a lack of functional fitness to clearance of defective mtDNA.
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