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Related Experiment Video

Updated: Apr 13, 2026

A Caenorhabditis elegans Nutritional-status Based Copper Aversion Assay

A Caenorhabditis elegans Nutritional-status Based Copper Aversion Assay

Published on: July 26, 2017

C. elegans discriminates colors to guide foraging.

D Dipon Ghosh^1,2, Dongyeop Lee², Xin Jin³

¹Department of Cellular and Molecular Physiology, Yale University, New Haven, CT, USA. dipon@mit.edu michael.nitabach@yale.edu.

Science (New York, N.Y.)

|March 6, 2021

Summary

This summary is machine-generated.

Roundworms can see color without eyes or opsins, using light ratios to avoid toxins. This discovery reveals novel mechanisms for spectral discrimination in simple organisms.

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Area of Science:

* Sensory Biology
* Animal Behavior
* Genetics

Background:

* Color detection is crucial for animal navigation and survival.
* It is traditionally believed to depend on evolutionarily conserved opsin photoreceptor genes.
* Opsins are light-sensitive proteins found in photoreceptor cells.

Purpose of the Study:

* To investigate color discrimination abilities in *Caenorhabditis elegans* (roundworms).
* To determine the mechanisms underlying opsin-independent color detection.
* To explore the ecological relevance of color discrimination in wild roundworm strains.

Main Methods:

* Behavioral assays to observe foraging decisions in response to light stimuli and toxins.
* Genetic analysis to identify genes involved in color-dependent foraging.
* Comparative studies across different wild *C. elegans* strains.

Main Results:

* *C. elegans* can discriminate colors, specifically using blue-to-amber light ratios to avoid a blue-pigment toxin.
* This color-dependent foraging occurs independently of eyes and opsins.
* Significant variation in color discrimination abilities exists among wild strains, highlighting ecological importance.

Conclusions:

* Opsin-independent color detection is possible, mediated by cellular stress response pathways.
* Cellular stress response genes are required for spectral discrimination in *C. elegans*.
* These findings suggest that spectral discrimination mechanisms may be more widespread and diverse than previously thought, even in organisms lacking opsins.