Document Type
Journal Article
Publication Title
Scientific Reports
ISSN
2045-2322
Volume
9
Issue
1
First Page
12688
Last Page
12688
PubMed ID
31481717
Publisher
Springer
School
School of Medical and Health Sciences
RAS ID
31235
Abstract
Research in α-actinin-3 knockout mice suggests a novel role for α-actinin-3 as a mediator of cell signalling. We took advantage of naturally-occurring human "knockouts" (lacking α-actinin-3 protein) to investigate the consequences of α-actinin-3 deficiency on exercise-induced changes in mitochondrial-related genes and proteins, as well as endurance training adaptations. At baseline, we observed a compensatory increase of α-actinin-2 protein in ACTN3 XX (α-actinin-3 deficient; n = 18) vs ACTN3 RR (expressing α-actinin-3; n = 19) participants but no differences between genotypes for markers of aerobic fitness or mitochondrial content and function. There was a main effect of genotype, without an interaction, for RCAN1-4 protein content (a marker of calcineurin activity). However, there was no effect of genotype on exercise-induced expression of genes associated with mitochondrial biogenesis, nor post-training physiological changes. In contrast to results in mice, loss of α-actinin-3 is not associated with higher baseline endurance-related phenotypes, or greater adaptations to endurance exercise training in humans.
DOI
10.1038/s41598-019-49042-y
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License
Comments
Papadimitriou, I. D., Eynon, N., Yan, X., Munson, F., Jacques, M., Kuang, J., ... Bishop, D. J. (2019). A “human knockout” model to investigate the influence of the α-actinin-3 protein on exercise-induced mitochondrial adaptations. Scientific Reports, 9, Article 12688. Available here