Pirouette Model Simulation
Objective: Test the sufficiency of the pirouette model for chemotaxis by imposing correlation between pirouettes and concentration gradient change in a stochastic point model simulation
This is a Pirouette Model Simulation protocol using Caenorhabditis elegans as the model organism. The procedure involves 4 procedural steps, 2 materials. Extracted from a 1999 paper published in Journal of Neuroscience.
Model and subjects
Caenorhabditis elegans
Study window
Estimated timing pending
Core workflow
Establish pirouette-concentration gradient correlation • Test model in radial gradient • Test model in planar gradient
Primary readouts
- Chemotaxis behavior in radial gradient
- Chemotaxis behavior in planar gradient
- Model sufficiency for explaining chemotaxis mechanism
- Generality of pirouette model across gradient types
Key equipment and reagents
Use this page as an execution guide, then fall back to the source paper whenever you need exact exclusions, dosing details, or assay-specific caveats.
Confirm first
- Verify the animal model, intervention setup, and collection timepoints against the source paper.
- Check that every direct vendor link matches the exact specification your lab plans to run.
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- Work through the protocol steps in order and use the inline vendor chips only when you need to source or verify an item.
- Jump to Experimental Context for readouts, data shape, and analysis flow before planning downstream analysis.
Protocol Steps
Start here. The step list is optimized for running the experiment, with direct vendor links available inline when you need to source a cited item.
Establish pirouette-concentration gradient correlation
Impose correlation between pirouettes and rate of change of concentration (dC/dt) on the stochastic point model based on empirical observations that pirouettes initiate when worms head down gradient and are least likely when heading up gradient
Note: Correlation based on finding that pirouette initiation was correlated with dC/dt but not with absolute concentration
View evidence from paper
“We tested this idea by imposing the correlation between pirouettes and dC/dt on a stochastic point model of worm motion”
Test model in radial gradient
Run the stochastic point model simulation in a radial concentration gradient to assess whether the model exhibits chemotaxis behavior
Note: Radial gradient represents a standard chemotaxis condition
View evidence from paper
“The model exhibited chemotaxis behavior in a radial gradient and also in a novel planar gradient”
Test model in planar gradient
Run the stochastic point model simulation in a novel planar concentration gradient to test generality of the pirouette model
Note: Planar gradient represents a novel condition not previously tested
View evidence from paper
“The model exhibited chemotaxis behavior in a radial gradient and also in a novel planar gradient”
Analyze chemotaxis behavior
Evaluate whether the model exhibits chemotaxis behavior in both gradient conditions to determine if the pirouette model is sufficient and general
Note: Success criteria: model must exhibit chemotaxis in both radial and planar gradients
View evidence from paper
“Thus, the pirouette model of C. elegans chemotaxis is sufficient and general”