title: A major QTL on chromosome 11 influences psychostimulant and opioid sensitivity in mice.
abstract: The identification of genes influencing sensitivity to stimulants and opioids is important for determining their mechanism of action and may provide fundamental insights into the genetics of drug abuse. We used a panel of C57BL/6J (B6; recipient)x A/J (donor) chromosome substitution strains (CSSs) to identify quantitative trait loci (QTL) for both open field activity and sensitivity to the locomotor stimulant response to methamphetamine (MA). Mice were injected with saline (days 1 and 2) and MA (day 3; 2 mg/kg i.p.). We analyzed the total distance traveled in the open field for 30 min following each injection. CSS-8, -11 and -16 showed reduced MA-induced locomotor activity relative to B6, whereas CSS-10 and -12 showed increased MA-induced locomotor activity. Further analysis focused on CSS-11 because it was robustly different from B6 following MA injection, but did not differ in activity following saline injection and because it also showed reduced locomotor activity in response to the mu-opioid receptor agonist fentanyl (0.2 mg/kg i.p.). Thus, CSS-11 captures QTLs for the response to both psychostimulants and opioids. Using a B6 x CSS-11 F(2) intercross, we identified a dominant QTL for the MA response on chromosome 11. We used haplotype association mapping of cis expression QTLs and bioinformatic resources to parse among genes within the 95% confidence interval of the chromosome 11 QTL. Identification of the genes underlying QTLs for response to psychostimulants and opioids may provide insights about genetic factors that modulate sensitivity to drugs of abuse.
authors.affiliation: Department of Human Genetics, University of Chicago, Chicago, IL, USA.
authors.forename: C D
authors.initials: CD
authors.lastname: Bryant
authors.forename: H P
authors.initials: HP
authors.lastname: Chang
authors.forename: J
authors.initials: J
authors.lastname: Zhang
authors.forename: T
authors.initials: T
authors.lastname: Wiltshire
authors.forename: L M
authors.initials: LM
authors.lastname: Tarantino
authors.forename: A A
authors.initials: AA
authors.lastname: Palmer
mesh_terms: D000701:Analgesics, Opioid / Q000494:pharmacology*; D000818:Animals; D000697:Central Nervous System Stimulants / Q000494:pharmacology*; D004351:Drug Resistance / Q000235:genetics; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D006239:Haplotypes; D008297:Male; D008694:Methamphetamine / Q000494:pharmacology; D051379:Mice; D008810:Mice, Inbred C57BL; D008818:Mice, Neurologic Mutants; D009043:Motor Activity / Q000187:drug effects / Q000235:genetics; D040641:Quantitative Trait Loci / Q000235:genetics*; D017450:Receptors, Opioid, mu / Q000819:agonists / Q000235:genetics; D019966:Substance-Related Disorders / Q000235:genetics*
chemical_list: D000701:Analgesics, Opioid; D000697:Central Nervous System Stimulants; D017450:Receptors, Opioid, mu; D008694:Methamphetamine
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