MGI:2178323Mice homozygous for a knock-out allele exhibit reductions in excitatory and inhibitory synapse density and deficits in synaptic transmission. Whole-body KO results in reduced sensitivity to diet-induced obesity, reduced body weight and fat amount and increased energy expenditure. It, and neuron-specific homozygous KO, also causes reduction in bone marrow volume, bone mass and femur length.