Mice carrying paternal knockout of imprinted Grb10 do not show compulsive behaviours
Rienecker, K.; Chavasse, A.; Moorwood, K.; Ward, A.; Humby, T.; Isles, A.
Show abstract
Mice lacking paternal expression of imprinted Grb10 show a number of social behaviour deficits, including an enhanced allogrooming phenotype. However, this could also index compulsive behaviour, and the increased whisker barbering seen in Grb10+/p mice has been suggested to be indicative of a trichotillomania-type behaviour. Here we test whether compulsive behaviour is a more general phenotype in Grb10+/p mice by examining marble burying. We also examined the mice for potentially confounding anxiety phenotypes using the elevated plus maze (EPM). Grb10+/p mice showed no difference from wild-type littermate controls on any measure in the marble burying test at any age. However, Grb10+/p mice were more willing to enter, spend time on, and head-dip on the open arm of the EPM than wild-type mice. These data suggest that Grb10+/p mice are not generally more compulsive, and that the enhanced allogrooming is probably indicative of altered social behaviour. Furthermore, the altered behaviours seen on the EPM adds to other published findings suggesting that Grb10 has a role in mediating risk-taking.
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