Abstract
A complimentary two-phase strategy was used to detect and map quantitative trait loci (QTLs) associated with the basal locomotor response to a saline challenge (10 ml/kg). In phase 1, putative QTLs, significant at p < 0.01 or better, were identified by analysis of the strain means for 25 strains of the B × D recombinant inbred series. QTLs were identified on chromosomes 1, 3, 5, 9, 10, 16, and 18. Some of these QTLs were detected across the entire experimental period (0–20 min), while others were associated with specific 5-min blocks. Eighteen hundred C57BL/6J (B6) × DBA/2J (D2) F2 intercross animals were phenotyped for the basal locomotor response, and of this group, 500 to 700 individuals, psuedo-randomly selected, were used for a genomewide scan to confirm the RI-generated QTLs and to detect new QTLs. No new QTLs were detected but the QTLs on chromosome 1 were confirmed at p < 10−5 to p < 10−9, depending on the time interval. In addition, the QTLs on chromosomes 5 and 9 were confirmed at p < 0.001, providing a combined probability (RI + F2) which exceeds the threshold for a significant association. Two additional phenotypes which showed significant RI strain differences were examined—adaptation and thigmotaxis. Adaptation mapped to the same region of chromosome 9 and thigmotaxis to the same region of chromosome 1 as the distance-traveled QTL. Overall, the data presented here and elsewhere (Flint et al., 1995; Gershenfeld et al., 1997) illustrate that QTLs for basal activity are both robust and reliable.
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Koyner, J., Demarest, K., McCaughran, J. et al. Identification and Time Dependence of Quantitative Trait Loci for Basal Locomotor Activity in the BXD Recombinant Inbred Series and a B6D2 F2 Intercross. Behav Genet 30, 159–170 (2000). https://doi.org/10.1023/A:1001963906258
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DOI: https://doi.org/10.1023/A:1001963906258