Effects of Light and Temperature on Daily Activity and Clock Gene Expression in Two Mosquito Disease Vectors

Journal of Biological Rhythms
Gustavo B S RivasRafaela Vieira Bruno

Abstract

Most organisms feature an endogenous circadian clock capable of synchronization with their environment. The most well-known synchronizing agents are light and temperature. The circadian clock of mosquitoes, vectors of many pathogens, drives important behaviors related to vectoral capacity, including oviposition, host seeking, and hematophagy. Main clock gene expression, as well as locomotor activity patterns, has been identified in Aedes aegypti and Culex quinquefasciatus under artificial light-dark cycles. Given that these mosquito species thrive in tropical areas, it is reasonable to speculate that temperature plays an important role in the circadian clock. Here, we provide data supporting a different hierarchy of light and temperature as zeitgebers of two mosquito species. We recorded their locomotor activity and quantified mRNA expression of the main clock genes in several combinations of light and temperature cycles. We observed that A. aegypti is more sensitive to temperature, while C. quinquefasciatus is more responsive to light. These variations in clock gene expression and locomotor activity may have affected the mosquito species' metabolism, energy expenditure, fitness cost, and pathogen transmission efficiency. Our f...Continue Reading

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Citations

May 28, 2019·Journal of Vector Ecology : Journal of the Society for Vector Ecology·Shi ChaoRui-De Xue
Oct 1, 2018·The European Journal of Neuroscience·Charlotte Helfrich-FörsterPamela Menegazzi
Dec 18, 2020·Frontiers in Behavioral Neuroscience·Katharina Beer, Charlotte Helfrich-Förster
Mar 28, 2021·Chronobiology International·Rayane Teles-de-FreitasRafaela V Bruno

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Methods Mentioned

BETA
PCR

Software Mentioned

DAMSystem3
Excel
GraphPad Prism
ActogramJ
gplots

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