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The Journal of Neuroscience, November 1, 1999, 19(21):9557-9569
The Fundamental Role of Pirouettes in Caenorhabditis
elegans Chemotaxis
Jonathan T.
Pierce-Shimomura,
Thomas
M.
Morse, and
Shawn R.
Lockery
Institute of Neuroscience, University of Oregon, Eugene, Oregon
97403-1254
To investigate the behavioral mechanism of chemotaxis in
Caenorhabditis elegans, we recorded the instantaneous
position, speed, and turning rate of single worms as a function of time
during chemotaxis in gradients of the attractants ammonium chloride or biotin. Analysis of turning rate showed that each worm track could be
divided into periods of smooth swimming (runs) and periods of frequent
turning (pirouettes). The initiation of pirouettes was correlated with
the rate of change of concentration
(dC/dt) but not with absolute
concentration. Pirouettes were most likely to occur when a worm was
heading down the gradient (dC/dt < 0) and least likely to occur when a worm was heading up the gradient (dC/dt > 0). Further analysis
revealed that the average direction of movement after a pirouette was
up the gradient. These observations suggest that chemotaxis is produced
by a series of pirouettes that reorient the animal to the gradient. We
tested this idea by imposing the correlation between pirouettes and
dC/dt on a stochastic point model of worm
motion. The model exhibited chemotaxis behavior in a radial gradient
and also in a novel planar gradient. Thus, the pirouette model of
C. elegans chemotaxis is sufficient and general.
Key words:
nematode; chemosensation; spatial orientation; neural
computation; behavioral models; sensorimotor integration
Copyright © 1999 Society for Neuroscience 0270-6474/99/19219557-13$05.00/0
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