Fruitflies adapt activity to 'white nights' WWU_Muenster NatureComms
because it triggers the permanent degradation of the clock protein"timeless" via a molecular reaction chain. Thus, the circadian rhythm is lost.
However, temperature cycles can overcome the effects of constant illumination. The experts have demonstrated that flies with the recently evolved ls-tim allele synchronize their circadian rhythm with theunder light and temperature conditions that mimic a Scandinavian summer day. One indicator was the insects' level of active movement.
The research team also proved that even a single copy of the ls-tim allele is sufficient to enable synchronization in"Scandinavian conditions," which further supports the spreading of this allele. Like humans, for example, fruit flies possess two either identical or similar copies of each gene—one copy from each parent.
The new gene variant produces a protein that deviates slightly from the original form, which is particularly stable under illumination, and therefore, interferes with the molecular reaction cascade that otherwise triggers the degradation of the clock protein"timeless.
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