The +/+) mouse model of autism spectrum disorder displays auditory avoidance in a novel behavioral test.

Introduction: Autism spectrum disorder (ASD) is characterized by deficits in communication and social interaction, restricted interests, repetitive behaviors, and sensory alterations, with auditory hypersensitivity being one of the most commonly reported sensory-perceptual abnormalities. Several candidate genes for involvement in this disorder have emerged from patient studies, including , a gene that encodes a protein (SHANK3) in the postsynaptic density of excitatory synapses. Previous work has shown that mutant mice carrying a human ASD mutation in the gene () exhibit repetitive behaviors and social interaction deficits, indicating important construct and face validity for this genotype as an animal model of ASD.

Methods: To further address whether these mice also present auditory sensory-perceptual alterations, we developed a novel behavioral test in which mice can choose between different soundscapes.

Results: Our results reveal that, in comparison to wild-type mice, mutants display a strong behavioral preference toward silent regions of the arena.

Discussion: These data suggest that - mutant mice might express an auditory hypersensitivity phenotype, further adding to the face validity of this genotype as an animal model of ASD.