Use of repeated measures in an analysis of ethanol-induced loss of righting reflex in inbred long-sleep and short-sleep mice.
We present a repeated-measures analysis of ethanol-induced loss of righting reflex (LRR) in Inbred Long-Sleep (ILS) and Inbred Short-Sleep (ISS) strains of mice and their F1 and F2 cross progeny. Mice were administered a 4.1 g/kg intraperitoneal dose of ethanol at two times, 7-10 days apart. Repeatability is nonsignificant in ILS, ISS, and F1 mice, but is highly significant (0.47, p < 0.01) in the F2 mice. Mean LRR does not differ between trials 1 and 2, with the exception of the ISS strain in which the interaction of sex with LRR sensitization is significant. This two-trial method leads to increased accuracy of genotype assessment for pharmacological or behavioral traits where trial 1 does not influence the outcome of trial 2. The repeated-measures design facilitates novel analyses of the duration of LRR, and results suggest that most environmental variance for LRR is due to nonreplicable influences.
Markel
P D
PD
Institute for Behavioral Genetics, University of Colorado, Boulder 80309-0447, USA.
DeFries
J C
JC
Johnson
T E
TE
D000435:Alcoholic Intoxication / Q000235:genetics*; D000818:Animals; D004361:Drug Tolerance; D005260:Female; D007274:Injections, Intraperitoneal; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D010641:Phenotype; D004856:Postural Balance / Q000187:drug effects*; D012018:Reflex / Q000187:drug effects* / Q000235:genetics; D012894:Sleep Stages / Q000187:drug effects* / Q000235:genetics