NRXN1 depletion in the medial prefrontal cortex induces anxiety-like behaviors and abnormal social phenotypes along with impaired neurite outgrowth in rat.
Lowering one synapse gene in teen rat prefrontal cortex is enough to create anxiety and social problems seen in autism.
01Research in Context
What this study did
Scientists lowered the NRXN1 gene in the teen rat prefrontal cortex. They wanted to see if this single gene change would spark autism-like actions.
They watched for anxious moves and social slips. They also checked how brain cell branches grew.
What they found
The rats acted more scared and less social after the gene drop. Their brain cell branches were shorter and tangled.
No ABA tricks were tested. The work is pure biology, not therapy.
How this fits with other research
Arnold et al. (2026) used mice with half the Nrxn1 gene and saw timing problems. Both papers link the same gene to different autism traits, so the gene-behavior line is wider than we thought.
Mottolese et al. (2024) found early anxiety and social gaps in Cdkl5-KO mice. Hopkins et al. (2023) now show similar gaps start in teen rats with NRXN1 loss, hinting that different genes can hit the same behaviors.
Libero et al. (2016) erased Pten in oxytocin cells and saw almost no social change. Hopkins et al. (2023) saw big social change after NRXN1 loss in prefrontal cells. The clash tells us location and gene choice matter more than simply flipping any autism-linked gene.
Why it matters
You can’t knock genes down in kids, but you can watch for teens who suddenly grow anxious and avoid peers. Pair those signs with known genetic risk and you may catch the right moment to start social-skills training or anxiety coping tools. The rat data say the window is open in early adolescence, so don’t wait.
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02At a glance
03Original abstract
<h4>Background</h4>Neurodevelopmental disorders (NDDs) are a group of disorders induced by abnormal brain developmental processes. The prefrontal cortex (PFC) plays an essential role in executive function, and its role in NDDs has been reported. NDDs are associated with high-risk gene mutations and share partially overlapping genetic abnormalities.<h4>Methods</h4>Neurexins (NRXNs) are related to autism spectrum disorder (ASD) and attention-deficit hyperactivity disorder (ADHD). NRXN1, an essential susceptibility gene for NDDs, has been reported to be associated with NDDs. However, little is known about its key role in NDDs.<h4>Results</h4>NRXN1 downregulation in the medial PFC induced anxiety-like behaviors and abnormal social phenotypes with impaired neurite outgrowth in Sh-NRXN1 in prefrontal neurons. Moreover, tandem mass tag (TMT)-based proteomic analysis of rat brain samples showed that NRXN1 downregulation led to significant proteome alterations, including pathways related to the extracellular matrix, cell membrane, and morphologic change. Furthermore, full-automatic immunoblotting analysis verified the differently expressed proteins related to cell morphology and membrane structure.<h4>Conclusions</h4>Our results confirmed the association of NRXN1 with abnormal behaviors in NDDs and provided richer insights into specific prefrontal knockdown in adolescence, potentially expanding the NRXN1 interactome and contributing to human health.
, 2023 · doi:10.1186/s11689-022-09471-9