title: Genetic control of temperature preference in the nematode Caenorhabditis elegans.
abstract: Animals modify behavioral outputs in response to environmental changes. C. elegans exhibits thermotaxis, where well-fed animals show attraction to their cultivation temperature on a thermal gradient without food. We show here that feeding-state-dependent modulation of thermotaxis is a powerful behavioral paradigm for elucidating the mechanism underlying neural plasticity, learning, and memory in higher animals. Starved experience alone could induce aversive response to cultivation temperature. Changing both cultivation temperature and feeding state simultaneously evoked transient attraction to or aversion to the previous cultivation temperature: recultivation of starved animals with food immediately induced attraction to the temperature associated with starvation, although the animals eventually exhibited thermotaxis to the new temperature associated with food. These results suggest that the change in feeding state quickly stimulates the switch between attraction and aversion for the temperature in memory and that the acquisition of new temperature memory establishes more slowly. We isolated aho (abnormal hunger orientation) mutants that are defective in starvation-induced cultivation-temperature avoidance. Some aho mutants responded normally to changes in feeding state with respect to locomotory activity, implying that the primary thermosensation followed by temperature memory formation remains normal and the modulatory aspect of thermotaxis is specifically impaired in these mutants.
authors.affiliation: Group of Molecular Neurobiology, Graduate School of Science, Nagoya University, Japan.
authors.forename: Akiko
authors.initials: A
authors.lastname: Mohri
authors.forename: Eiji
authors.initials: E
authors.lastname: Kodama
authors.forename: Koutarou D
authors.initials: KD
authors.lastname: Kimura
authors.forename: Mizuho
authors.initials: M
authors.lastname: Koike
authors.forename: Takafumi
authors.initials: T
authors.lastname: Mizuno
authors.forename: Ikue
authors.initials: I
authors.lastname: Mori
mesh_terms: D000064:Acclimatization / Q000187:drug effects / Q000235:genetics*; D000821:Animal Feed; D000818:Animals; D017173:Caenorhabditis elegans / Q000187:drug effects / Q000235:genetics* / Q000254:growth & development; D005247:Feeding Behavior; D008741:Methyl Methanesulfonate / Q000494:pharmacology; D009068:Movement / Q000187:drug effects / Q000502:physiology; D009153:Mutagens / Q000494:pharmacology; D009154:Mutation; D012701:Serotonin / Q000494:pharmacology; D013696:Temperature
chemical_list: D009153:Mutagens; D012701:Serotonin; D008741:Methyl Methanesulfonate