Summary
DNA hypomethylation in zebrafish (achieved via ~70% reduction in DNA methyltransferase 1 activity) disrupted circadian rhythms under constant low light and induced hyperactivity under normal lighting conditions, suggesting epigenetic mechanisms may modulate light-dependent behavior. These findings have implications for understanding how environmental neurotoxicants that alter DNA methylation could impair circadian entrainment and light-responsive behaviors.
Key Findings
- DNA methyltransferase 1-mutant zebrafish exhibited approximately 70% reduction in enzymatic activity compared to wild type.
- Significant difference in visual-motor response (VMR) was found between wild type and mutant zebrafish.
- Mutants lacked persistent circadian rhythms when held in constant low light conditions.
- Mutants were hyperactive under normal lighting conditions compared to wild type controls.
- Methylmercury exposure induced global DNA hypomethylation in addition to previously established neurobehavioral deficits.
Categories
Sleep & Circadian Health: Mutant zebrafish with reduced DNA methyltransferase activity showed disrupted circadian rhythms under constant low light conditions.
The Science of Light: The study used light-based behavioral assays (visual-motor response, circadian rhythm testing) to assess neurobehavioral effects of DNA hypomethylation in zebrafish.
Author(s)
M Pickens
Publication Year
2015
Number of Citations
1
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The Science of Light
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