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Researchers at the University of Murcia, in collaboration with scientists from Germany and Italy, have determined that the biological clock of cave-dwelling fish that are blind and live in total darkness, although it is insensitive to light by the absence of day / night cycles yes it is synchronized with power cycles.
In their work, which has been published in the journal PLoS Biology, the professors of the Department of Physiology Francisco Javier Sánchez and José Fernando López compared the zebrafish circadian clock, which is regulated by the pattern of light, the cave fish , which is able to synchronize to the food.
Functional analysis article makes the blind fish has shown that the absence of resetting the circadian clock as a function of light is not due to the lack of eyes on the species, but two opsins mutations that cause clocks most tissues do not react to light.
Cave fishes are blind, and lead apigmentados two to three million years living in total darkness, making their peculiar biological clock with a frequency of more than 40 hours, nearly double of most animals, including man.
Source: Universidad de Murcia
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