Using the Nematode Caenorhabditis elegans daf-16 Mutant to Assess the Lifespan Toxicity of Prolonged Exposure to Ecotoxic Agents
Bibliographic record
Abstract
Nematodes are highly abundant organisms found in soil or sedimentary habitats. The free-living nematode Caenorhabditis elegans (C. elegans) has been used as an excellent model for monitoring ecotoxicity in soil. We have previously demonstrated that the lifespan of C. elegans can be used as an endpoint for detecting the ecotoxicity of heavy metals and detergents, and have developed a novel ecotoxicity assay based on their shortened lifespan. Herein we used a daf-16(mu86) mutant CF1038 strain, which has a deficient transcription factor DAF-16 regulating a variety of genes involved in longevity and stress response, for ecotoxicity assays. We carefully examined the effects on reproduction, larval growth, and lifespan in the short-lived CF1038 strain and wild-type N2 strain in the presence of a perfluoro organic compound (pentadecafluorooctanoic acid) and an organophosphate insecticide (dichlorvos) in addition to heavy metals (CuSO4 and CdCl2) and detergents (sodium dodecyl sulfate and a commercially available household detergent). Unexpectedly, both strains exhibited comparable reductions in these endpoints including lifespan by exposure to these ecotoxicants, indicating that DAF-16 does not largely contribute to tolerance to these agents. By virtue of a shorter assay period, the lifespan-based assay using the daf-16 mutant can be useful for assessing the ecotoxicity of a variety of ecotoxic chemicals.
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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 | 0.003 | 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".