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  • Study links gene...

Study links gene regulating brain circuit formation to autism and seizures

Dr. Kamal Kant KohliWritten by Dr. Kamal Kant Kohli Published On 2025-01-12T21:00:29+05:30  |  Updated On 12 Jan 2025 9:00 PM IST
Study links gene regulating brain circuit formation to autism and seizures
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The gene neuropilin2 encodes a receptor involved in cell-cell interactions in the brain and plays a key role in regulating the development of neural circuits. Neuropilin2 controls migration of inhibitory neurons as well as the formation and maintenance of synaptic connections in excitatory neurons-two crucial components of brain activity.

A study led by neuroscientist Viji Santhakumar at the University of California, Riverside, and collaborators at Rutgers University in Newark, New Jersey, now offers insights into how this gene contributes to the development of behavioral changes associated with autism spectrum disorder and epilepsy. The study, published in Nature Molecular Psychiatry, offers a pathway for future treatments aimed at alleviating some challenging symptoms of these frequently co-occurring conditions.

Previous research has linked mutations in neuropilin2 to neurological disorders like autism and epilepsy, but the mechanisms involved have remained largely unclear. In the current study, Santhakumar and her collaborators created an “inhibitory neuron selective knockout” mouse model to examine the consequences of deleting the neuropilin2 gene. They found the absence of neuropilin2 impairs the migration of inhibitory neurons, disrupting the delicate balance between excitatory and inhibitory signals in the brain.

“This imbalance leads to autism-like behaviors and an increased risk of seizures,” said Santhakumar, lead investigator of the study and a professor of molecular, cell and systems biology. “Our study results highlight how a single gene can influence both the excitatory and inhibitory systems in the brain. We show that disrupting inhibitory circuit development is sufficient to cause autism-related behaviors and epilepsy to co-occur. By better understanding how neuropilin2 works in the formation of the brain’s circuitry, we may be able to develop more targeted therapies for different features of these disorders.”

A unique aspect of the research is the focus on the migration of inhibitory neurons, a process in which neuropilin2 plays a crucial role. By selectively deleting neuropilin2 during a key developmental window, the researchers found impairments in inhibitory regulation of the circuit, which led to deficits in behavioral flexibility, social interactions, and an increased risk for seizures.

The study findings suggest that targeting specific phases of neuronal development could open new doors for therapeutic interventions, potentially preventing the onset of these disorders if detected early.

“By isolating the role of inhibitory circuit formation, we may be able to develop therapeutic strategies that could improve outcomes for individuals with autism, particularly those who experience seizures,” Santhakumar said.

Santhakumar came to UCR in 2018 from Rutgers University to expand her research vision of developing a multi-level understanding of brain circuit function in health and disease and uncover the biological processes contributing to developmental brain disorders. The current collaborative study employed cutting-edge techniques in both behavioral and physiological assessments. The team’s research was funded by the Rutgers Brain Health Institute and the New Jersey Council for Autism Spectrum Disorders.

“This study is a step forward in understanding the genetic and circuit underpinnings of autism and epilepsy,” Santhakumar said. “It is crucial we continue to explore the precise mechanisms that govern circuit development and maintenance because this knowledge could ultimately help us develop new interventions for a range of developmental disorders, from autism to attention-deficit/hyperactivity disorder and schizophrenia.”

Reference:

Subramanian, D., Eisenberg, C., Huang, A. et al. Dysregulation of neuropilin-2 expression in inhibitory neurons impairs hippocampal circuit development and enhances risk for autism-related behaviors and seizures. Mol Psychiatry (2024). https://doi.org/10.1038/s41380-024-02839-4

Molecular Psychiatryautism spectrum disorderepilepsyseizures
Source : Molecular Psychiatry
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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