CHEMICAL AND GENETIC SCREENING APPLICATIONS OF A MICROFLUIDIC ELECTROTAXIS ASSAY USING NEMATODE CAENORHABDITIS ELEGANS
Bibliographic record
Abstract
Combining the nematode Caenorhabditis elegans with novel microfluidic technology has produced a phenotypic movement assay that is at once rapid, sensitive, and low-cost. The method is based on the neurophysiologic phenomenon of worms exhibiting robust, continuous, directed locomotion in response to mild electric fields inside a microchannel. As we demonstrate with the studies reported herein, our microfluidic electrotaxis platform is a unique tool for studying the effects of environmental and genetic manipulations on C. elegans’ movement behaviour, which in turn indicates the state of the organism’s neuronal and muscular systems. \nIn one initiative to develop an inexpensive biosensor, we use the setup to measure the response of worms to common environmental pollutants. Results indicate that worms’ electrotactic swimming behaviour is particularly susceptible to metal salts. A comparison with traditional assays measuring fecundity, growth, and lifespan reveals that electrotactic speed shows a comparable level of sensitivity as a toxicity endpoint. \nAnother study demonstrates that worms expressing a mutant form of α-synuclein, a familial Parkinson’s disease-related protein, show deficits in electrotactic swimming speed that coincide with dopaminergic neuron damage. We further show that both the electrotaxis and neuronal phenotypes can be ameliorated by treatment with curcumin, a putative neuroprotective agent. \nWe have also used the platform to investigate the effects of other environmental and genetic stresses on electrotactic behaviour. Our findings indicate that the response can withstand many different insults but is affected by stresses that induce the mitochondrial and ER unfolded protein responses, which themselves play roles in preserving electrotactic swimming behaviour alongside the heat shock response. \nThese data expand our knowledge of how the motor output component of C. elegans’ electrotactic response is perturbed by environmental and genetic manipulations, and also support the utility of microfluidic electrotaxis as a functional output of nematode locomotory circuits in a multitude of contexts.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".