Scientists reverse autism-like symptoms in mice by repairing shortened nerve cell structures

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Scientists reverse autism-like symptoms in mice by repairing shortened nerve cell structures

by<br>Eric W. Dolan

June 30, 2026

Reading Time: 5 mins read

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A recent study published in Cell Death & Disease suggests that specific cellular abnormalities in the brain associated with autism spectrum disorder might be reversible. By artificially activating a targeted neural pathway in a mouse model, scientists successfully restored the structure of a key neuron component and improved social and repetitive behaviors. This provides evidence that some core symptoms of the disorder stem from adaptable brain changes rather than permanent damage.

Autism spectrum disorder, commonly known as ASD, is a complex developmental condition characterized by challenges with social communication and the presence of restricted or repetitive behaviors. Genetic factors play a significant role in the development of ASD. One known genetic risk factor is the duplication of a specific chromosomal region, referred to as 15q11-13. Mouse models carrying this genetic duplication tend to exhibit behavioral symptoms that mirror human ASD.

To better understand the biological roots of these symptoms, scientists focus on the microscopic structures of the brain. Neurons, or nerve cells, communicate by sending electrical signals called action potentials. These signals are generated at a specific site on the neuron called the axon initial segment. The axon initial segment is highly adaptable, meaning it can change its length and position to regulate how easily a neuron fires an electrical signal, which is a form of brain plasticity.

A collaborative research group aimed to determine if the structural changes seen in the axon initial segment of ASD mouse models represent permanent structural damage or a reversible state. The team was led by Masashi Fujitani, a professor in the Department of Anatomy and Neuroscience at Shimane University’s Faculty of Medicine, alongside colleagues from Kobe University and Hyogo Medical University.

"This research was motivated by my interest in identifying abnormal neural circuits in the brain," Fujitani said. "Because the axon initial segment (AIS) is known to change its length in an activity-dependent manner, we hypothesized that its properties might vary across different neural circuits depending on their projection targets."

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The authors analyzed a total of 214 mice, comparing normal healthy mice with the ASD mouse model that carries the genetic duplication. They used high-resolution microscopes and fluorescent markers to measure the length of the axon initial segment in various brain regions. They focused on pyramidal neurons, which are a primary type of excitatory nerve cell in the cortex. The researchers specifically looked at the medial prefrontal cortex, an area of the brain known to regulate social behavior, decision-making, and emotional responses.

The researchers utilized a technique called whole-cell patch-clamp recording to measure the electrical properties of the brain slices. The results showed that in the ASD mouse model, the axon initial segment was significantly shortened in a specific sub-layer of the medial prefrontal cortex. This shortened structure resulted in reduced neuronal excitability, meaning the neurons had a much harder time firing electrical signals. This shortening acts as a homeostatic adaptation, which is the brain’s way of trying to balance its overall electrical activity.

Interestingly, this structural abnormality was not widespread across all brain cells. The researchers used a method called retrograde tracing to map where the abnormal neurons were sending their signals. They found that the shortened cellular structures were highly specific to neurons that connect the medial prefrontal cortex to other distant brain regions.

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"Consistent with this idea, we found projection-specific changes in AIS structure," Fujitani noted. One of the most affected pathways was the connection to the dorsal raphe nucleus, which is a major source of serotonin in the brain and is heavily involved in social engagement.

To test if this structural abnormality could be fixed, the scientists employed a sophisticated technique called chemogenetics. This method involves using engineered viral vectors to deliver specialized receptors into specific groups of neurons. These newly introduced receptors remain inactive until the researchers administer a specific designer drug.

The team targeted the precise neural circuit projecting from the medial prefrontal cortex to the dorsal raphe nucleus....