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Genetic susceptibility in solvent induced neurobehavioral effects
L Godderis1, N Maertens, V de Gelder
1Department of Occupational, Environmental and Insurance Medicine, Katholieke Universiteit Leuven, Kapucijnenvoer 35/5, Leuven, 3000, Belgium. lode.godderis@med.kuleuven.be
Neurotoxicity Research
|August 25, 2009
Summary
Genetic variations in GST enzymes and dopamine receptors influence neurobehavioral effects from solvent exposure. Certain genotypes, like GSTM1 and GSTT1, may offer protection against cognitive and sensory issues in exposed individuals.
Area of Science:
- Neurotoxicology
- Neurogenetics
- Occupational Health
Background:
- Solvent exposure is linked to neurobehavioral deficits.
- Genetic factors may modulate individual susceptibility to neurotoxicity.
- Understanding these interactions is crucial for occupational health and safety.
Purpose of the Study:
- To investigate the impact of genetic polymorphisms in biotransformation enzymes (GSTM1, GSTT1, GSTP1) and dopamine receptors (DRD2) on neurobehavioral outcomes.
- To compare these effects in healthy referents, solvent-exposed workers, and patients with chronic toxic encephalopathy (CTE).
Main Methods:
- Cross-sectional study involving 220 participants (referents, solvent-workers, CTE patients).
- Assessment of neurobehavioral complaints using the Neurotoxicity Symptom Checklist-60.
- Evaluation of neurobehavioral effects including reaction time, symbol digit substitution, hand-eye coordination, and digit span backwards using a computer-assisted test battery.
- Genotyping for GSTM1, GSTT1, GSTP1, DRD2 Taq1A, DRD2 Taq1B, and DRD2-141Cdel polymorphisms.
Main Results:
- CTE patients exhibited significantly higher neurotoxic effects and complaints, correlated with exposure duration and level.
- Genotype distribution was similar across all groups.
- GSTT1 polymorphism was associated with fewer sleep and sensorimotor complaints.
- GSTM1 polymorphism showed a protective effect against cognitive deficits (digit span backwards, simple reaction time) related to cumulative solvent exposure.
- DRD2-141Cdel polymorphism was linked to increased visuomotor problems (symbol digit substitution) and negative effects on cognitive performance with prolonged exposure.
Conclusions:
- Genetic polymorphisms of biotransformation enzymes and dopamine receptors play a role in modulating neurobehavioral effects of solvent exposure.
- GSTM1 and GSTT1 may confer protection against specific neurotoxic symptoms, while DRD2-141Cdel may increase susceptibility to certain deficits.
- These findings highlight the importance of genetic factors in personalized occupational health strategies for solvent-exposed workers.
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