Key result
Alpha-actinin-3 deficiency significantly increased calcineurin activity in human and mouse skeletal muscle, providing a mechanistic explanation for enhanced endurance performance.
Population
Actn3 KO and WT mice, and human skeletal muscle biopsies from females with ACTN3 577RR and 577XX genotypes.
Comparison
Alpha-actinin-3 deficiency and 4-week treadmill… vs Wild-type mice, untrained controls, and ACTN3…
Design
Preclinical, Operator blinded to the mouse genotype during endurance testing…
Follow-up
4 weeks (for endurance training)
Authors
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Animal data implicate alpha-actinin-3 in endurance via calcineurin; leaves open human translation and therapeutic targeting.
p-value: p=0.004
Alpha-actinin-3 deficiency enhances skeletal muscle endurance performance and adaptation to training through increased calcineurin signaling mediated by alpha-actinin-2.
Seto et al. (2013) studied Alpha-actinin-3 deficiency (n=11). ACTN3 577XX genotype (alpha-actinin-3 deficiency) vs. ACTN3 577RR genotype (WT) was evaluated on RCAN1-4 expression (marker of calcineurin activity) (p=0.004). Alpha-actinin-3 deficiency significantly increased calcineurin activity in human and mouse skeletal muscle, providing a mechanistic explanation for enhanced endurance performance.
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