Abstract
To contribute to a better understanding of the molecular basis of the circadian biological rhythms in Chagas disease vectors, in this work we identified functional domains in the sequences of the clock protein TIMELESS (TIM) in Rhodnius prolixus and analyzed the expression of the timeless (tim) gene at the mRNA level in Triatoma infestans. The tim gene expression in nervous tissue of adult T. infestans revealed clear oscillations in the abundance of the transcript in both sexes in the group maintained under photoperiod with a daily canonical rhythm, showing a significant increase in expression at sunset. As expected, in the group maintained in constant light, no daily increase was detected in the tim transcript level.
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