Cytochrome b, coded by mitochondrial DNA, is one of the cytochromes involved in electron transport in the respiratory chain of mitochondria. Cytochrome b is a critical intermediate in a mitochondrial death pathway. To reveal whether cytochrome b of the mosquito Aedes aegypti (L.) (Diptera: Culicidae) (AeaCytB) is developmentally regulated, we used real-time quantitative polymerase chain reaction (qPCR) to examine AeaCytB gene expression levels in different developmental stages of Ae. aegypti. The qPCR showed that AeaCytB was expressed in each developmental stage, with peaks at first and second instars and was highly expressed in teneral male and female Ae. aegypti adults. Because mitochondrial genes exist as multiple copies, AeaCytB has much higher expression levels in all developmental stages in Ae. aegypti compared with nuclear genes. We also investigated the effect of abiotic environmental factors (e.g., high temperatures, ultraviolet radiation, and pesticide) on AeaCytB gene expression. Taken together, these results suggest that AeaCytB gene plays an important role in the development of Ae. aegypti and its response to environmental stress.
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Journal of Medical Entomology
Vol. 46 • No. 6
November 2009
Vol. 46 • No. 6
November 2009
Aedes aegypti
cytochrome b
development
permethrin
quantitative polymerase chain reaction