Perirhinal cortex abnormalities impair hippocampal plasticity and learning in,, andautism mouse models.

Abstract

Learning and memory deficits, including spatial navigation difficulties, are common in autism spectrum disorder (ASD). Several ASD mouse models (,,) exhibit impaired spatial learning, with these deficits often attributed to hippocampal dysfunction. However, we identify the perirhinal cortex (PRC) as a critical driver of these deficits. Cortical-widereduction in excitatory neurons replicated the spatial learning and long-term potentiation (LTP) impairments-a cellular correlate of learning-seen inmice, while hippocampal-wide reduction did not. PRC-specific viral-mediatedreduction in excitatory neurons decreased release probability, which consequently disrupted synaptic transmission and LTP in the hippocampus, as well as spatial learning. As PRC activity was reduced, chemogenetic activation of the PRC reversed these deficits inmice and rescued spatial learning and LTP impairments inandknockout mice. Thus, in several genetic models of ASD, PRC abnormalities may disrupt hippocampal function to impair learning and memory.