An HSP90-regulated reduced-eye phenotype in Tribolium shows fitness benefits and thus provides evidence for evolutionary capacitance
Aboelsoud, R.; Kurtz, J.
Show abstract
Evolution relies on genetic variation as the raw material for adaptation. The release of cryptic genetic variation (CGV), which can be regulated by the evolutionary capacitor heat shock protein 90 (HSP90), may thus be important for rapid adaptation. However, the fitness benefits of HSP90-regulated phenotypes are still under debate. Here, we show in the important model insect Tribolium castaneum that HSP90 impairment by two independent methods, RNA interference and chemical inhibition, revealed the same reduced-eye phenotype, which was stably inherited without further HSP90 inhibition. The penetrance and fitness of this trait increased under ambient light stress. This is the first demonstration that a phenotype released through HSP90 inhibition can be adaptive.
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