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Quantitative trait loci for acute behavioral sensitivity to paraoxon
F O Risinger1, E Quick, J K Belknap
1Department of Behavioral Neuroscience, L470, Portland Alcohol Research Center, Oregon Health Sciences University, 3181 SW Sam Jackson Park Road, Portland, OR 97201-3098, USA. risinger@ohsu.edu
Neurotoxicology and Teratology
|December 7, 2000
Summary
Genetic factors influence sensitivity to organophosphate (OP) paraoxon, which affects mouse behavior. Researchers identified quantitative trait loci (QTL) linked to paraoxon-induced changes in locomotor activity, revealing potential genetic targets.
Area of Science:
- Neuroscience
- Genetics
- Toxicology
Background:
- Organophosphate (OP) compounds can cause behavioral changes, but the underlying genetic mechanisms are not well understood.
- Paraoxon, an OP insecticide, is known to affect locomotor activity.
Purpose of the Study:
- To identify quantitative trait loci (QTL) associated with acute sensitivity or insensitivity to paraoxon-induced hypolocomotion.
- To investigate the genetic basis of behavioral responses to organophosphate exposure.
Main Methods:
- BXD/Ty series mice were treated with paraoxon or a vehicle control.
- Locomotor activity was measured in an activity chamber following treatment.
- Quantitative trait loci (QTL) analysis was performed using genetic markers to associate genomic regions with behavioral phenotypes.
Main Results:
- Paraoxon treatment significantly reduced locomotor activity in most mouse strains, with heritability estimated at 0.58.
- Several provisional QTL were identified on different chromosomes (e.g., Chr 1, 6, 9, 11, 15) associated with paraoxon-induced activity changes.
- Genes near QTL regions include plasma carboxylesterase alleles, glutamate receptor subtypes, and glycine receptor subunits.
Conclusions:
- Genetic factors play a significant role in individual differences in sensitivity to organophosphate paraoxon.
- The identified QTL and candidate genes provide a foundation for further research into the neurogenetic mechanisms of OP toxicity.
- This study highlights potential genetic targets for understanding and mitigating organophosphate-induced behavioral effects.