Experiential contributions to social dominance in a rat model of fragile-X syndrome.
|Experiential contributions to social dominance in a rat model of fragile-X syndrome.
|Year of Publication
|Saxena K, Webster J, Hallas-Potts A, Mackenzie R, Spooner PA, Thomson D, Kind P, Chatterji S, Morris RGM
|Proc Biol Sci
|2018 Jun 13
Social withdrawal is one phenotypic feature of the monogenic neurodevelopmental disorder fragile-X. Using a 'knockout' rat model of fragile-X, we examined whether deletion of the gene that causes this condition would affect the ability to form and express a social hierarchy as measured in a tube test. Male fragile-X 'knockout' rats living together could successfully form a social dominance hierarchy, but were significantly subordinate to wild-type animals in mixed group cages. Over 10 days of repeated testing, the fragile-X mutant rats gradually showed greater variance and instability of rank during their tube-test encounters. This affected the outcome of future encounters with stranger animals from other cages, with the initial phenotype of wild-type dominance lost to a more complex picture that reflected, regardless of genotype, the prior experience of winning or losing. Our findings offer a novel insight into the complex dynamics of social interactions between laboratory living groups of fragile-X and wild-type rats. Even though this is a monogenic condition, experience has an impact upon future interactions with other animals. Gene/environment interactions should therefore be considered in the development of therapeutics.
|Proc. Biol. Sci.
|PubMed Central ID