The soil-dwelling model organism C. elegans, long assumed to lack any visual system whatsoever, in fact appears to be strongly responsive to light, according to a linkurl:paper; published online yesterday (July 6) in Nature Neuroscience. The study identifies four sensory neurons that act as photoreceptor cells driving this phototaxic behavior, and suggests a conservation of phototransduction between vertebrates and worms. "The research is very compelling," said linkurl:Aravinthan Samuel,; who studies sensory inputs and navigational behaviors in C. elegans at Harvard. "It's the strongest evidence so far that phototaxis is a bona fide modality in worms."
linkurl:C. elegans; live in the darkness of soil and lack eyes, so the tiny roundworms were never chosen as a candidate to study sensory response to light stimulus. But linkurl:Shawn Xu,; a biologist at the University of Michigan, reasoned differently. "There must be some reason they want to stay in soil,"...
C. elegansC. elegans

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