How are COMT and fatigue related?

The provided context does not contain specific information on the relationship between COMT and fatigue. COMT (catechol-O-methyltransferase) is an enzyme involved in dopamine and catecholamine metabolism. The well-studied Val158Met polymorphism (rs4680) affects enzyme activity: the Met variant leads to slower degradation and higher dopamine levels, while the Val variant results in faster breakdown. Some research suggests that the Val/Val genotype may be associated with lower stress resilience and higher perceived fatigue under demanding conditions, possibly due to altered prefrontal dopamine signaling. However, findings are inconsistent; many studies show no direct link or only weak associations. Fatigue is multifactorial, involving sleep, nutrition, stress, and medical conditions. Without direct evidence from the provided context, the connection remains speculative. A DNA test alone cannot diagnose fatigue; clinical evaluation is essential.