Cntnap2 loss drives striatal neuron hyperexcitability and behavioral inflexibility.

Scientists studied mice missing a gene called Cntnap2 that's linked to autism. They found these mice had overactive brain cells in an area that controls movement and habits. The mice showed repetitive behaviors, difficulty changing routines, and problems with flexible thinking - similar to some autism traits. This research helps explain how genetic changes might lead to repetitive behaviors in autism.

This preclinical study examined how loss of the Cntnap2 gene affects brain circuits in mice, specifically focusing on striatal neurons involved in motor learning and habit formation. Researchers found that Cntnap2-deficient mice showed increased excitability in direct pathway striatal projection neurons (dSPNs), making them more responsive to cortical inputs. These neurological changes were associated with repetitive behaviors, enhanced motor routine learning, perseveration, and cognitive inflexibility - behaviors relevant to autism spectrum disorder. The findings suggest that altered corticostriatal signaling may contribute to the development of restricted, repetitive behaviors characteristic of ASD.

This research advances understanding of how genetic mutations may alter brain circuits to produce autism-related behaviors. The identification of hyperexcitable striatal neurons as a potential mechanism could inform future therapeutic approaches targeting repetitive behaviors, though translation to human interventions requires further research.

Animal model study with unclear sample sizes. Findings from mouse models may not directly translate to human autism. The study focuses on one specific gene and brain circuit, which may not capture the full complexity of autism neurobiology.

Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by two major diagnostic criteria - persistent deficits in social communication and interaction, and the presence of restricted, repetitive patterns of behavior (RRBs). Evidence from both human and animal model studies of ASD suggests that alteration of striatal circuits, which mediate motor learning, action selection, and habit formation, may contribute to the manifestation of RRBs.is a syndromic ASD risk gene, and loss of function ofin mice is associated with RRBs. How the loss ofimpacts striatal neuron function is largely unknown. In this study, we utilizedmice to test whether altered striatal neuron activity contributes to aberrant motor behaviors relevant to ASD.

We find thatmice exhibit enhanced cortical drive of direct pathway striatal projection neurons (dSPNs). This enhanced drive is due to increased intrinsic excitability of dSPNs, which make them more responsive to cortical inputs. We find thatmice exhibit spontaneous repetitive behaviors, increased motor routine learning, perseveration, and cognitive inflexibility. Increased corticostriatal drive may therefore contribute to the acquisition of repetitive, inflexible behaviors inmice.