Circadian expression of clock genes in two mosquito disease vectors: cry2 is different

Journal of Biological Rhythms
Carla GentileAlexandre A Peixoto

Abstract

Different mosquito species show a full range of activity patterns, including diurnal, crepuscular, and nocturnal behaviors. Although activity and blood-feeding rhythms are controlled by the circadian clock, it is not yet known whether such species-specific differences in behavior are controlled directly by core clock genes or instead reflect differences in how the information of the central clock is translated into output signals. The authors have analyzed the circadian expression of clock genes in two important mosquito vectors of tropical diseases, Aedes aegypti and Culex quinquefasciatus . Although these two species show very different locomotor activity patterns and are estimated to have diverged more than 22 million years ago, they show conserved circadian expression patterns for all major cycling clock genes except mammalian-like cryptochrome2 (cry2). The results indicate that different mechanisms for cry2 regulation may exist for the two species. The authors speculate that the correlation between the differences in behavior between Ae. aegypti and Cx. quinquefasciatus and their corresponding cry2 mRNA profiles suggests a potential role for this clock gene in controlling species-specific rhythmic behavior. However, furthe...Continue Reading

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