TY - JOUR
T1 - Quantitative trait loci for acute behavioral sensitivity to paraoxon
AU - Risinger, Fred O.
AU - Quick, Edwin
AU - Belknap, John K.
N1 - Funding Information:
Supported in part by NIH grants AA10520 and AA10760.
PY - 2000
Y1 - 2000
N2 - Genetic mechanisms responsible for organophosphate (OP)-induced behavioral changes remain obscure. In the present study, provisional quantitative trait loci (QTL) associated with acute sensitivity or insensitivity to hypolocomotion produced by the OP paraoxon were identified. Naive adult male and female mice of the BXD/Ty series (22 different BXD strains plus C57BL/6J and DBA/2J progenitor strains) received 0 or 0.25 mg/kg paraoxon (IP), immediately before placement in an activity chamber for a 30-min test. As expected, based on dose-response and time course studies with Swiss-Webster, C57BL/6, and DBA/2 mice, paraoxon treatment reduced locomotor activity in most, but not all BXD strains. Heritability (proportion of phenotypic variability attributed to genetic differences) was 0.58 for the paraoxon treatment effect. Difference scores (strain mean for vehicle activity minus strain mean for paraoxon activity), and percent change in activity of paraoxon-treated mice compared to vehicle-treated mice were calculated for each BXD strain. QTL analyses using activity difference scores and percentage change in activity were conducted using a database with over 1300 unique genetic markers. Several provisional QTL found on different chromosomes were associated with the activity phenotype. Of these, several markers attained p < 0.01 or greater. These were as follows: Chr 1: Ly9, p < 0.006; Chr 6: D6Ncvs44, p < 0.0005; Chr 9: D9Mit15, p < 0.003; Chr 11: D11Ncvs76, p < 0.002; Chr 15: Tstap198, p < 0.008. In addition, several markers on chromosome 3 approached p < 0.01. Identified genes found near these regions include two plasma carboxylesterase alleles on chromosomes 6 and 9, a glutamate receptor subtype on chromosome 11 and a glycine receptor subunit on chromosome 11, raising the possibility that these genes could be the basis for these provisional QTLs.
AB - Genetic mechanisms responsible for organophosphate (OP)-induced behavioral changes remain obscure. In the present study, provisional quantitative trait loci (QTL) associated with acute sensitivity or insensitivity to hypolocomotion produced by the OP paraoxon were identified. Naive adult male and female mice of the BXD/Ty series (22 different BXD strains plus C57BL/6J and DBA/2J progenitor strains) received 0 or 0.25 mg/kg paraoxon (IP), immediately before placement in an activity chamber for a 30-min test. As expected, based on dose-response and time course studies with Swiss-Webster, C57BL/6, and DBA/2 mice, paraoxon treatment reduced locomotor activity in most, but not all BXD strains. Heritability (proportion of phenotypic variability attributed to genetic differences) was 0.58 for the paraoxon treatment effect. Difference scores (strain mean for vehicle activity minus strain mean for paraoxon activity), and percent change in activity of paraoxon-treated mice compared to vehicle-treated mice were calculated for each BXD strain. QTL analyses using activity difference scores and percentage change in activity were conducted using a database with over 1300 unique genetic markers. Several provisional QTL found on different chromosomes were associated with the activity phenotype. Of these, several markers attained p < 0.01 or greater. These were as follows: Chr 1: Ly9, p < 0.006; Chr 6: D6Ncvs44, p < 0.0005; Chr 9: D9Mit15, p < 0.003; Chr 11: D11Ncvs76, p < 0.002; Chr 15: Tstap198, p < 0.008. In addition, several markers on chromosome 3 approached p < 0.01. Identified genes found near these regions include two plasma carboxylesterase alleles on chromosomes 6 and 9, a glutamate receptor subtype on chromosome 11 and a glycine receptor subunit on chromosome 11, raising the possibility that these genes could be the basis for these provisional QTLs.
KW - Locomotor activity
KW - Paraoxon
KW - Quantitative trait loci
KW - Recombinant inbred mice
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U2 - 10.1016/S0892-0362(00)00085-4
DO - 10.1016/S0892-0362(00)00085-4
M3 - Article
C2 - 11106859
AN - SCOPUS:0033661859
SN - 0892-0362
VL - 22
SP - 667
EP - 674
JO - Neurotoxicology and Teratology
JF - Neurotoxicology and Teratology
IS - 5
ER -