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Nematodes inhabit diverse habitats and most nematode nervous systems are composed of a small number of neurons, despite a wide assortment in nematode sizes. Given this observation, we speculated that cellular contribution to stereotyped avoidance behaviors would also be conserved between nematode species. The ASH neuron mediates avoidance of three classes of noxious stimuli in <jats:italic>Caenorhabditis elegans<\/jats:italic>. Two species of parasitic nematodes also utilize the ASH neuron to avoid certain stimuli. We wanted to extend our knowledge of avoidance behaviors by comparing multiple stimuli in a set of free-living nematode species.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results\n<\/jats:title>\n            <jats:p>We used comparative behavioral analysis and laser microsurgery to examine three avoidance behaviors in six diverse species of free-living nematodes. We found that all species tested exhibit avoidance of chemo-, mechano- and osmosensory stimuli. In <jats:italic>C. elegans<\/jats:italic>, the bilaterally symmetric polymodal ASH neurons detect all three classes of repellant. We identified the putative ASH neurons in different nematode species by their anatomical positions and showed that in all six species ablation of the ASH neurons resulted in an inability to avoid noxious stimuli. However, in the nematode <jats:italic>Pristionchus pacificus<\/jats:italic>, the ADL neuron in addition to the ASH neuron contributed to osmosensation. In the species <jats:italic>Caenorhabditis<\/jats:italic> sp. 3, only the ASH neuron was required to mediate nose touch avoidance instead of three neurons in <jats:italic>C. elegans<\/jats:italic>. These data suggest that different species can increase or decrease the contribution of additional, non-ASH sensory neurons mediating osmosensation and mechanosensation.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion\n<\/jats:title>\n            <jats:p>The overall conservation of ASH mediated polymodal nociception suggests that it is an ancestral evolutionarily stable feature of sensation. However, the finding that contribution from non-ASH sensory neurons mediates polymodal nociception in some nematode species suggests that even in conserved sensory behaviors, the cellular response network is dynamic over evolutionary time, perhaps shaped by adaptation of each species to its environment.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1741-7007-6-52","type":"journal-article","created":{"date-parts":[[2008,12,16]],"date-time":"2008-12-16T07:14:19Z","timestamp":1229411659000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":41,"title":["Evolution of a polymodal sensory response network"],"prefix":"10.1186","volume":"6","author":[{"given":"Jagan","family":"Srinivasan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Omer","family":"Durak","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul W","family":"Sternberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2008,12,15]]},"reference":[{"issue":"1165","key":"205_CR1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1098\/rstb.1986.0056","volume":"314","author":"JG White","year":"1986","unstructured":"White JG: The structure of the nervous system of the nematode Caenorhabditis elegans. 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