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- Title
Impaired respiration is positively correlated with decreased life span in Caenorhabditis elegans models of Friedreich Ataxia.
- Authors
Zarse, Kim; Schulz, Tim J.; Birringer, Marc; Ristow, Michael
- Abstract
Impaired expression of mitochondrial genes causes alterations in life span of the nematode Caenorhabditis elegans. Intriguingly, although some of these genes have been shown to extend life expectancy and reduce aging processes, others are known to shorten life span in the same model organism. Reduced expression of a mitochondrial protein called frataxin causes a neurodegenerative disorder named Friedreich Ataxia, which decreases life span in humans. Surprisingly, reduced expression of the C. elegans frataxin homologue frh-1 has been associated with both increased as well as decreased life span by different laboratories. To further elucidate these conflicting findings, here we show that different RNA interference (RNAi) constructs directed against frh-1 reduce C. elegans life span. Moreover, we show that frh-l-inhibiting RNAi impairs oxygen consumption and that respiratory rate is positively correlated with life span in this multi-cellular eukaryote (r= 0.8566), suggesting that > 73% of life span variance in C. elegans is explained by changes in respiratory rate. Taken together, impaired mitochondrial metabolism due to RNAi-mediated inhibition of the frataxin homologue frh-1 causes both impaired respiration as well as decreased life span in the multi-cellular eukaryote C. elegans.
- Subjects
GENES; CAENORHABDITIS elegans; NEMATODES; NEURODEGENERATION; RNA
- Publication
FASEB Journal, 2007, Vol 21, Issue 4, p1271
- ISSN
0892-6638
- Publication type
Article
- DOI
10.1096/fj.06-6994com