What role does FOXO3 play in Müdigkeit?

FOXO3 is a transcription factor involved in cell cycle regulation, apoptosis, oxidative stress response, and autophagy. Regarding fatigue, mechanistic and animal studies suggest FOXO3 may influence mitochondrial function and energy homeostasis. Reduced FOXO3 activity could impair energy production and increase oxidative stress, potentially contributing to fatigue. However, human evidence is weak: no large GWAS have directly linked FOXO3 variants to chronic fatigue. Most data come from cell or mouse models. FOXO3 is more commonly studied in longevity and aging contexts. Therefore, direct-to-consumer genetic tests claiming a role for FOXO3 in fatigue should be interpreted with caution. The effect size is likely small and not clinically actionable. Persistent fatigue requires medical evaluation, not just genetic insight.