Summary: Researchers have launched a pioneering study to determine how genes linked to autism spectrum disorder (ASD) converge on shared neural mechanisms, with a particular focus on auditory hypersensitivity. The team aims to identify common circuit-level changes that different ASD-associated genes may cause, which could explain why many individuals with autism experience overwhelming sensitivity to ordinary sounds.
Using approaches that combine cellular-level control and population-level recording—such as optogenetics and in-vivo electrophysiology—in rat models, the investigators plan to map how specific neurons and circuits contribute to sound over-responsivity. Their findings could inform new diagnostic approaches and therapeutic strategies for sensory hypersensitivities in ASD.
Key Facts:
- Searching for Shared Neural Pathways in ASD: The study explores whether diverse genetic causes of ASD produce similar effects on neuronal circuits, creating common vulnerabilities like auditory hypersensitivity.
- Concentration on Auditory Hypersensitivity: By studying the auditory system, the project addresses a sensory challenge that frequently impairs daily functioning and quality of life for people with ASD.
- Advanced Experimental Tools with Clinical Potential: The research uses optogenetics to manipulate specific interneurons and in-vivo electrophysiology to monitor circuit activity, with the ultimate goal of testing interventions such as minocycline for sensory hypersensitivity.
Source: Beckman Institute
Backed by a $2 million R01 grant from the National Institutes of Health, the Auerbach Lab at the Beckman Institute for Advanced Science and Technology will examine how different genes tied to autism may produce similar changes in brain neurons, leading to increased sensitivity to sound.
Autism spectrum disorder is genetically complex: hundreds of genes have been associated with altered development and function. That complexity can make ASD seem like a set of unrelated conditions that only happen to share symptoms. This project takes a different view, asking whether distinct genetic disruptions funnel into a smaller number of shared circuit-level problems.
“Clinically, we see a wide range of behaviors and symptoms on one side, and a wide range of genetic changes on the other,” said Benjamin Auerbach, lead investigator and assistant professor of molecular and integrative physiology at the University of Illinois Urbana-Champaign. “Our goal is to trace how differing genetic starting points may converge on common neural circuit outcomes.”
Previous work from Auerbach’s lab showed that two common ASD-associated mutations can have opposite effects at the cellular level yet produce similar behavioral symptoms. This funded project will test whether these seemingly contradictory cellular signatures instead converge at the circuit level, producing comparable increases in sensory sensitivity.
The auditory system is a strategic focus because sensory hypersensitivities—especially to sound—are highly prevalent in ASD and can be profoundly disabling. Everyday environments like classrooms, shopping centers, and public transit can overwhelm affected individuals, causing pain, anxiety, impaired concentration, and social withdrawal.
Neuronal networks rely on a delicate balance between excitatory and inhibitory connections. Excitatory synapses increase neural activity while inhibitory synapses suppress it. When this balance is disrupted, circuits can become hyperexcitable, which in auditory regions can amplify normal sound inputs into distressing sensory overload.
The team will investigate whether the two most common ASD-linked mutations produce an imbalance between excitation and inhibition in auditory circuits, and whether a shared disruption of a particular inhibitory neuron type—parvalbumin-positive (PV+) interneurons—underlies that imbalance. PV+ interneurons play a central role in shaping the timing and gain of excitatory neurons; dysregulation of these cells can heighten sensitivity to ordinary sounds.
Researchers will employ rat models to probe how auditory circuits respond to controlled sound stimuli and how behavior tracks with neural activity. In-vivo electrophysiology will record population-level electrical signals from auditory regions, allowing direct correlation between neural dynamics and sensory-driven behaviors.
Collaborators at the Beckman Institute, including Howard Gritton, will apply optogenetics to selectively activate or suppress targeted neurons using light-sensitive proteins. By turning PV+ interneurons on or off with precise timing, the team can test whether restoring inhibitory function reduces auditory hypersensitivity in animal models.
If optogenetic activation of PV+ interneurons mitigates sensory overload, those findings would support testing pharmacological approaches that influence the same cell type. For example, the researchers plan to evaluate minocycline, a drug known to affect PV+ interneuron function, as a candidate for reducing sensory hypersensitivity.
Beyond treatment development, the study aims to generate translational biomarkers. The experimental protocols used to quantify rats’ responses to sound could inform objective measures for human clinical trials. The team also seeks an electrophysiological biomarker—detectable with EEG—that would allow clinicians to screen for sensory hypersensitivity and improve the translation of animal-model findings to human studies.
“A key challenge in moving from animals to people is the lack of behavioral and electrophysiological measures that map cleanly across species,” Auerbach noted. “Sensory systems offer a promising bridge, and identifying robust biomarkers could accelerate development of targeted therapies.”
About this genetics and autism research news
Author: Jenna Kurtzweil
Source: Beckman Institute
Contact: Jenna Kurtzweil – Beckman Institute
Image: The image is credited to Neuroscience News