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Neuron
2009 May 28;624:526-38. doi: 10.1016/j.neuron.2009.04.013.
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A tyramine-gated chloride channel coordinates distinct motor programs of a Caenorhabditis elegans escape response.
Pirri JK
,
McPherson AD
,
Donnelly JL
,
Francis MM
,
Alkema MJ
.
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A key feature of escape responses is the fast translation of sensory information into a coordinated motor output. In C. elegans, anterior touch initiates a backward escape response in which lateralhead movements are suppressed. Here, we show that tyramine inhibits head movements and forward locomotion through the activation of a tyramine-gated chloride channel, LGC-55. lgc-55 mutant animals have defects in reversal behavior and fail to suppress head oscillations in response to anterior touch. lgc-55 is expressed in neurons and muscle cells that receive direct synaptic inputs from tyraminergic motor neurons. Therefore, tyramine can act as a classical inhibitory neurotransmitter. Activation of LGC-55 by tyramine coordinates the output of two distinct motor programs, locomotion and head movements that are critical for a C. elegans escape response.
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