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The genetic relationships between different behaviors used to index the rewarding or reinforcing effects of alcohol are poorly understood. To address this issue, ethanol-induced conditioned place preference (CPP) was tested in a genetically diverse panel of inbred mouse strains, and strain means from this study and other inbred strain studies were used to examine the genetic correlation between CPP and several ethanol-related phenotypes, including activity measures recorded during CPP training and testing. Mice from each strain were exposed to a well-characterized unbiased place conditioning procedure using ethanol doses of 2 or 4 g/kg; an additional group from each strain was exposed to saline alone on all trials. Genotype had a significant effect on CPP, basal locomotor activity, ethanol-stimulated activity, and the effect of repeated ethanol exposure on activity. Correlational analyses showed significant negative genetic correlations between CPP and sweetened ethanol intake and between CPP and test session activity, as well as a significant positive genetic correlation between CPP and chronic ethanol withdrawal severity. Moreover, there was a trend toward a positive genetic correlation between CPP and ethanol-induced conditioned taste aversion. These genetic correlations suggest overlap in the genetic mechanisms underlying CPP and each of these traits. The patterns of genetic relationships suggest a greater impact of ethanol's aversive effects on drinking and a greater impact of ethanol's rewarding effects on CPP. Overall, these data support the idea that genotype influences ethanol's rewarding effect, a factor that may contribute importantly to addictive vulnerability.

Genetic relationship between ethanol-induced conditioned place preference and other ethanol phenotypes in 15 inbred mouse strains.