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Significance Carbon dioxide (CO2 ) gradients are ubiquitous, but fluctuations in CO2 provide an important cue shaping animal behavior. This paradox suggests that CO2 provides contextual information that is integrated with other inputs. Here, we show thatCaenorhabditis elegans CO2 -sensing circuits are much more sophisticated than assumed hitherto. A surprisingly large number of neurons, including nociceptors, gustatory neurons, and olfactory neurons, respond to CO2 in vivo. Glia also exhibit large Ca2+ responses to CO2 . Worms therefore may couple detection of CO2 and other cues at the earliest stages of sensory processing. Besides avoiding CO2 ,C .elegans stops laying eggs at high CO2 . Inhibition of oviposition involves sustained activation of the AWC olfactory neurons by CO2 and enduring inhibition of neurons innervating the egg-laying muscles.

proceedings of the national academy of sciences of the united states of america

Environmental CO <sub>2</sub> inhibits <i>Caenorhabditis elegans</i> egg-laying by modulating olfactory neurons and evokes widespread changes in neural activity

Environmental CO 2 inhibits Caenorhabditis elegans egg-laying by modulating olfactory neurons and evokes widespread changes in neural activity

Environmental CO ₂ inhibits Caenorhabditis elegans egg-laying by modulating olfactory neurons and evokes widespread changes in neural activity