Recent human studies suggest that genetic polymorphisms allow an individual to maintain optimal cognitive functioning during sleep deprivation. If such polymorphisms were not associated with additional costs, selective pressures would allow these alleles to spread through the population such that an evolutionary alternative to sleep would emerge. To determine whether there are indeed costs associated with resiliency to sleep loss, we challenged natural allelic variants of the foraging gene (for) with either sleep deprivation or starvation. Flies with high levels of Protein Kinase G (PKG) (forR) do not display deficits in short-term memory following 12 h of sleep deprivation. However, short-term memory is significantly disrupted when forR flies are starved overnight. In contrast, flies with low levels of PKG (fors, fors2) show substantial deficits in short-term memory following sleep deprivation but retain their ability to learn after 12 h of starvation. We found that forR phenotypes could be largely recapitulated in fors flies by selectively increasing the level of PKG in the α/ß lobes of the mushroom bodies, a structure known to regulate both sleep and memory. Together, these data indicate that whereas the expression of for may appear to provide resilience in one environmental context, it may confer an unexpected vulnerability in other situations. Understanding how these tradeoffs confer resilience or vulnerability to specific environmental challenges may provide additional clues as to why an evolutionary alternative to sleep has not emerged.
J. Donlea et al., "Foraging Alters Resilience/Vulnerability to Sleep Disruption and Starvation in Drosophila," Proceedings of the National Academy of Sciences of the United States of America, vol. 109, no. 7, pp. 2613-2618, National Academy of Sciences, Feb 2012.
The definitive version is available at http://dx.doi.org/10.1073/pnas.1112623109
Keywords and Phrases
Cyclic GMP Dependent Protein Kinase, Allele; Amnesia; Animal Experiment; Article; Controlled Study; Coping Behavior; Drosophila; Female; Foraging Gene; Gene; Gene Expression; Genetic Polymorphism; Genetic Variability; Long Term Memory; Male; Memory; Mushroom Body; Nonhuman; Phenotype; Priority Journal; Short Term Memory; Sleep; Sleep Deprivation; Starvation, Animals; Behavior, Animal; Drosophila; Feeding Behavior; Sleep; Starvation, Basidiomycota
International Standard Serial Number (ISSN)
Article - Journal
© 2012 J. Donlea et. al., All rights reserved.