Deep-Sea Mussels Exhibit 24-Hour Circadian Rhythm in Laboratory Setting

Researchers from the University of Vienna and partner institutions have successfully maintained cell cultures from the deep-sea mussel Bathymodiolus azoricus for over three years. While these mussels experience tidal rhythms in their native hydrothermal vent environment 1,700 meters below the surface, their cells adopt a 24-hour circadian rhythm when kept in laboratory conditions.

The study, published in EMBO Reports, suggests significant plasticity in the mussels' biological clock machinery. By analyzing the core circadian clock genes, scientists discovered that the mussels can shift between 12.4-hour circatidal and 24-hour circadian timing. This technical achievement provides new molecular insights into how organisms without brains regulate biological timing.

Editor's note: The brief effectively summarizes the technical achievement and the observed shift in circadian rhythms.