Redox-regulation and life-history trade-offs: scavenging mitochondrial ROS improves growth in a wild bird

It has been proposed that animals usually restrain their growth because fast growth leads to an increased production of mitochondrial reactive oxygen species (mtROS), which can damage mitochondrial DNA and promote mitochondrial dysfunction. Here, we explicitly test whether this occurs in a wild bird...

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Bibliographic Details
Published in:Scientific reports 2019-02, Vol.9 (1), p.2203-2203, Article 2203
Main Authors: Velando, Alberto, Noguera, Jose C., da Silva, Alberto, Kim, Sin-Yeon
Format: Article
Language:English
Subjects:
38/39
45/77
631/158/2455
631/158/857
Birds
Citrate synthase
Copy number
DNA damage
Enzymatic activity
Growth rate
Humanities and Social Sciences
Juveniles
Life history
Mitochondrial DNA
multidisciplinary
Reactive oxygen species
Science
Science (multidisciplinary)
Supplements
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Summary:It has been proposed that animals usually restrain their growth because fast growth leads to an increased production of mitochondrial reactive oxygen species (mtROS), which can damage mitochondrial DNA and promote mitochondrial dysfunction. Here, we explicitly test whether this occurs in a wild bird by supplementing chicks with a mitochondria-targeted ROS scavenger, mitoubiquinone (mitoQ), and examining growth rates and mtDNA damage. In the yellow-legged gull Larus michahellis , mitoQ supplementation increased the early growth rate of chicks but did not reduce mtDNA damage. The level of mtDNA damage was negatively correlated with chick mass, but this relationship was not affected by the mitoQ treatment. We also found that chick growth was positively correlated with both mtDNA copy number and the mitochondrial enzymatic activity of citrate synthase, suggesting a link between mitochondrial content and growth. Additionally, we found that MitoQ supplementation increased mitochondrial content (in males), altered the relationship between mtDNA copy number and damage, and downregulated some transcriptional pathways related to cell rejuvenation, suggesting that scavenging mtROS during development enhanced growth rates but at the expense of cellular turnover. Our study confirms the central role of mitochondria modulating life-history trade-offs during development by other mechanisms than mtROS-inflicted damage.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-38535-5