At the intersection of light and molecular biology, researchers from DGIST and Stanford have handed science a new kind of key — one that can lock and unlock the chemical conversations between neurons with a precision previously beyond reach. The tool, called LATeNT, uses blue light to temporarily silence specific synaptic connections in the brain, then steps aside and lets nature restore itself within a day. In a field where the gap between understanding a disorder and treating it has long felt unbridgeable, this kind of reversible, targeted control over neural signaling marks a quiet but cons
DGIST Develops Light-Controlled Neuron Switch for Brain Disorder Research
Light-controlled precision where previous tools could only switch neurons on or off
Mark
What makes this different from just turning neurons on and off, which scientists have been able to do for years?
Mimi
The difference is like the distinction between a light switch and a dimmer. Previous tools could control whether a neuron fired or not. LATeNT controls something much more specific—whether one neuron can send a signal to another neuron at a particular synapse. And it does it reversibly, which matters because you can turn it off and watch the system recover.
Mark
Why does reversibility matter so much?
Mimi
Because if you permanently damage a synapse, you can't tell whether the problem was the synapse itself or the fact that you broke it. Reversibility lets you ask: what happens when this connection is quiet? And then: what happens when it wakes back up? That's how you learn what a circuit actually does.
Mark
The team tested it on anxiety in mice. How does blocking neurons in the hippocampus tell you anything about human anxiety?
Mimi
It doesn't directly, but it gives you a map. You find the neurons and connections involved in anxiety-like behavior in mice, then you can look for the same circuits in humans and ask whether they're wired differently in people with anxiety disorders. It's a starting point for understanding mechanism.
Mark
And the insulin work—that seems like a completely different application.
Mimi
It is, which is the point. If the same tool works on brain neurons and pancreatic cells, it suggests the underlying principle is portable. That's what makes it a platform rather than a one-off trick.
Mark
What's the practical barrier to using this in actual patients?
Mimi
Right now, none of this works in a living human. You'd need a way to deliver the genetic code for LATeNT into the right cells, and a way to shine blue light on the right part of the brain or body without damaging tissue. That's years of engineering away. But the molecular tool itself is proven.
The Pulse
- Neuropsychiatric disorders like anxiety and depression have long resisted treatment in part because scientists lacked tools fine enough to isolate which specific synaptic connections drive which behaviors — LATeNT directly addresses that gap.
- The technology cleaves a key neurotransmitter-release protein using blue light, effectively silencing targeted synapses on demand, with normal function returning naturally within 24 hours once the light is removed.
- In live mouse experiments, LATeNT outperformed existing optogenetic methods by producing stronger, longer-lasting inhibition of hippocampal neurons linked to anxiety — validating the tool under real biological conditions.
- The platform's reach extends beyond the brain: researchers successfully used it to regulate insulin secretion in pancreatic cells, suggesting LATeNT could become a cross-tissue control system for metabolic and immune disorders.
- Published in Nature Methods and backed by South Korean national science funding, the research is now pointing toward integration with gene delivery and drug systems as a pathway to personalized precision therapies.
At the intersection of light and molecular biology, researchers from DGIST and Stanford have handed science a new kind of key — one that can lock and unlock the chemical conversations between neurons with a precision previously beyond reach. The tool, called LATeNT, uses blue light to temporarily silence specific synaptic connections in the brain, then steps aside and lets nature restore itself within a day. In a field where the gap between understanding a disorder and treating it has long felt unbridgeable, this kind of reversible, targeted control over neural signaling marks a quiet but consequential turning point.
A research team at DGIST in South Korea, collaborating with Stanford's Professor Alice Ting, has built a molecular tool that uses light to control how neurons communicate — a capability that neuroscientists have long sought but struggled to achieve with the necessary precision and reversibility.
The tool, LATeNT, works by combining a blue-light-sensing protein with a modified neurotoxin component that targets VAMP2, a protein neurons depend on to release chemical signals across synapses. When blue light is applied, LATeNT cuts VAMP2 and silences transmission at specific synaptic connections. When the light is removed, the system resets on its own, with normal signaling returning within roughly 24 hours. Crucially, the tool requires only weak light stimulation — an important advantage when working with living tissue.
In mouse studies, the team used LATeNT to silence inhibitory neurons in the hippocampus and trace their role in anxiety-related behavior. The results were more robust and sustained than those produced by conventional optogenetic approaches, suggesting the tool had cleared a genuine technical hurdle that its predecessors could not.
The researchers then extended their experiments beyond the brain, demonstrating that LATeNT could precisely regulate insulin secretion in pancreatic beta cells. That finding reframes the technology as a potential general-purpose platform for controlling cellular signaling across multiple tissues and disease contexts — from neurological and metabolic disorders to immune dysfunction and cancer.
Professor Ji Won Um described LATeNT as the first instrument capable of targeting specific synaptic proteins with both spatial and temporal control. Published in Nature Methods in July 2026, the work does not offer a cure for any condition, but it gives researchers a clearer window into the machinery of the brain — and a new set of handles with which to reach inside it.
A team of neuroscientists at DGIST, a research institute in South Korea, has engineered a molecular switch that uses light to control how neurons talk to each other. The tool, called LATeNT, represents a significant leap forward in the ability to study and potentially treat brain disorders by giving researchers unprecedented precision in manipulating the connections between nerve cells.
The problem LATeNT solves is both technical and fundamental. Synapses—the tiny gaps where neurons exchange chemical signals—are where things go wrong in conditions like anxiety, depression, and autism. For decades, neuroscientists have wanted a way to selectively silence specific synaptic connections to understand which ones matter for which behaviors. Existing light-based tools could turn neurons on or off, but they struggled with the finer work of blocking signal transmission at individual synapses for sustained periods and then cleanly restoring normal function afterward.
Professor Ji Won Um's team at DGIST, working with collaborators at Stanford led by Professor Alice Ting, designed LATeNT by combining two biological components: a light-sensing protein called LOV, which responds to blue light, and a modified version of tetanus neurotoxin that cuts a specific protein involved in releasing neurotransmitters. When exposed to blue light of the right wavelength, LATeNT cleaves VAMP2, a protein essential for neurons to send signals across synapses. When the light turns off, the system reverses itself naturally, with normal communication resuming within about 24 hours. The elegance of the design lies in its reversibility and its efficiency—the tool works with surprisingly weak light stimulation, which matters for experiments on living tissue.
In mouse studies, the researchers demonstrated the tool's power by temporarily silencing inhibitory neurons in the hippocampus, the brain region involved in memory and emotion. By blocking these specific neurons, they identified their role in controlling anxiety-related behavior. The results were stronger and longer-lasting than what conventional optogenetic tools could achieve, suggesting LATeNT had solved a real technical problem.
But the researchers did not stop at the brain. They applied LATeNT to pancreatic beta cells—the insulin-producing cells in the pancreas—and showed they could use light to precisely control insulin secretion. This finding hints at something larger: LATeNT may work as a general platform for controlling cellular functions across different tissues and systems, not just neurons. The implications ripple outward to metabolic disorders, immune dysfunction, and even cancer research.
Professor Um described the tool as the first molecular instrument capable of controlling specific synaptic proteins with both spatial and temporal precision. He suggested that when combined with gene delivery systems or drug-based control mechanisms, LATeNT could eventually become a foundation for personalized therapies targeting not only neurological disorders but also cancer, metabolic disease, and immune conditions. The research was published in Nature Methods in July 2026, supported by South Korea's Ministry of Science and ICT and the National Research Foundation of Korea. The work represents the kind of incremental but transformative advance that opens new doors in how we understand and treat disease—not a cure, but a tool that lets researchers see and manipulate the machinery of the brain with clarity they did not have before.
Notable Quotes
LATeNT is the first molecular tool that can spatiotemporally control the function of specific synaptic proteins, significantly enhancing the precision of neural circuit research.— Professor Ji Won Um, DGIST
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