SMRTR Science & EngineeringJul 20, 2026Nautilus

How Fruit Flies Tell What Time of Year It Is Without a Calendar

SMRTR summary

Fruit flies know what season it is thanks to a molecular trick inside their biological clock. A new study in Science Advances found that when temperatures drop, fruit flies switch production of a protein called "timeless" to a cold-weather version through a process called alternative splicing. This shifts the clock into a "winter state," slowing reproduction and activity until warmer conditions return.

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