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On association of the lethal yellow (A Y ) mutation in the agouti gene with the alterations in mouse brain and behavior.
Behavioural Brain Research 2018 November 15
Lethal yellow (AY ) mutation causes obesity and type-2 diabetes in mice. Here we studied the effect of the AY mutation on the brain and behavior. The experiments were carried out on adult (11-12 weeks old) males of AY /a mice and their wild-type littermates (a/a). Mice of AY /a and a/a genotypes did not differ in their home cage activity, sleep, food and water consumption, learning ability in the Morris water maze, anxiety in the open field and elevated plus-maze, as well as in the level of monoamines, metabolites and some genes expression in the brain. At the same time, the fat mass, depressive-like immobility in the forced swim and tail suspension tests were significantly increased in AY /a mice compared with a/a ones. Magnetic resonance imaging revealed a significant reduction of cortex volume in AY /a mice. The level of mRNA of Ptpn5 gene encoding striatal enriched tyrosine phosphatase in the frontal cortex of AY /a mice was significantly elevated compared with their wild-type littermates. This is the first report on the alterations in the brain and behavior in the AY /a mouse line. It is tempting to speculate that this mouse line can serve as a new and useful preclinical model to study neurobehavioral complications associated with obesity and type-2 diabetes.
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