Mapping quantitative trait loci that regulate sensitivity and tolerance to quinpirole, a dopamine mimetic selective for D2/D3 receptors

Kari Buck, Tamara Lischka, Janet Dorow, John Crabbe

Research output: Contribution to journalArticle

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Abstract

Acute sensitivity and tolerance to quinpirole (a dopamine mimetic with selectivity for D2/D3 dopamine receptors) were evaluated in the C57BL/6J and DBA/2J inbred strains of mice, 24 of their BXD recombinant inbred strains, and 233 F2 mice. Baseline locomotor activity, locomotor activity following 0.03 mg/kg quinpirole (and 0.01 mg/kg in BXD mice), body temperature following 1 mg/kg quinpirole, and hypothermic tolerance following 2 or 3 days of quinpirole administration were evaluated. Quantitative trait locus (QTL) analysis was employed to identify genetic determinants of baseline locomotor activity and five behavioral responses to quinpirole. We examined correlated allelic variation in genetic markers of known chromosomal location with variation in each of these phenotypes. We definitively mapped a QTL on Chromosome (Chr) 9 linked to the D2 dopamine receptor gene, Drd2, for hypothermic sensitivity to quinpirole, and identify a suggestive QTL in the same chromosomal region for tolerance to quinpirole after repeated treatments. Suggestive QTLs were also identified on Chr 19 for sensitivity and tolerance to quinpirole-induced hypothermia and for baseline locomotor activity; on Chr 15 for locomotor sensitivity to quinpirole; and on Chr 13 and 5 for baseline locomotor activity. Our results indicate that genetic differences in quinpirole sensitivity and tolerance are associated with QTLs near Drd2, and that baseline locomotor activity is associated with a suggestive QTL in proximity to the dopamine transporter gene Dat1. These data suggest that the genes influencing locomotor activity, dopamine mimetic sensitivity, and tolerance do not overlap completely. (C) 2000 Wiley-Liss, Inc.

Original languageEnglish (US)
Pages (from-to)696-705
Number of pages10
JournalAmerican Journal of Medical Genetics - Neuropsychiatric Genetics
Volume96
Issue number5
DOIs
StatePublished - Oct 9 2000

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Keywords

  • C57BL/6J
  • DBA/2J
  • Hypothermia
  • Locomotor activity
  • Recombinant inbred mice

ASJC Scopus subject areas

  • Genetics(clinical)
  • Psychiatry and Mental health
  • Cellular and Molecular Neuroscience

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