"Parasitic Worms Transform Shrimp into Vibrant Orange 'Zombies'"

Biologists at Brown University have sequenced the DNA of brown shrimp infected with a parasitic worm, shedding light on the molecular mechanisms behind the changes in the shrimp's behavior and color. The infected shrimp, which turn bright orange, become sluggish and spend more time in exposed areas of salt marshes, making them vulnerable to predation by birds. The study found that the infection activates gene transcripts associated with pigmentation and sensory perception, while suppressing immune response genes. This manipulation by the parasitic worm provides an evolutionary advantage, increasing its chances of spreading and reproducing. Understanding these host-parasite interactions can have implications for managing pathogens in humans and other organisms.