Originally published as Genetics Published Articles Ahead of Print on January 16, 2005.

Genetics, Vol. 169, 1437-1450, March 2005, Copyright © 2005
doi:10.1534/genetics.104.036111

Genetic Control of Temperature Preference in the Nematode Caenorhabditis elegans

Akiko Mohri^*, Eiji Kodama^*, Koutarou D. Kimura^*,1, Mizuho Koike^*, Takafumi Mizuno^* and Ikue Mori^*,,,2

^* Group of Molecular Neurobiology, Graduate School of Science
Institute for Advanced Research, Nagoya University, Nagoya 464-8602, Japan
PRESTO, Japan Science and Technology Corporation, Kawaguchi 332-0012, Japan

² Corresponding author: Group of Molecular Neurobiology, Graduate School of Science, Institute for Advanced Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan.
E-mail: m46920a{at}nucc.cc.nagoya-u.ac.jp

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.

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