Detection and mapping of quantitative trait loci for haloperidol-induced catalepsy in a C57BL/6J x DBA/2J F-2 intercross

A genomewide scan was conducted to detect quantitative trait loci (QTLs) fo r haloperidol-induced catalepsy in a C57BL/6J (B6) x DBA/2J (D2) F-2 interc ross (N = 678). Significant QTLs (LOD, >4.3) were detected on chromosomes I and 9. The relative position of the QTL on chromosome 1 is similar to open -field activity QTLs previously identified by Flint et al. (1995) and Gersh enfeld et nl. (1997). Given the broad confidence intervals for these QTLs, such associations must be viewed cautiously. However, these data are consis tent with the report of Kline et al. (1998), who found a significant geneti c associations between catalepsy and open-field activity. The QTL interval on chromosome 9 stretched from approximately 25 to 55 cM; this region conta ins numerous candidate genes, including Drd2, Ncam, Acat1, and Htr1b. The d ata also suggest the presence of a second QTL on chromosome 9 (LoD, >3.5) i n Vie proximal region of the chromosome. Potential candidate genes in this region include Penk2 and Gria4. Overall, these data support our previous ob servation (Kanes et al., 1996) that for the B6 x D2 genotypes, one or more polymorphisms on chromosome 9 are associated with the variance in haloperid ol response.