Summary: Researchers at Duke University have created LinCx, a custom-designed biological “wire” that can form selective electrical connections between chosen neurons. This engineered approach offers a way to bypass damaged or disrupted brain circuits, potentially providing a durable alternative to chronic medication or implanted stimulation devices for certain neurological disorders.
The study presents a method for building precise electrical synapses between specific neurons, enabling targeted, long-lasting changes in circuit function without broadly altering other cell populations.
Key Research Findings
- Cellular precision: Unlike drugs, broad electrical stimulation, or conventional optogenetic approaches that affect large groups of cells, LinCx creates new electrical links only between intentionally selected neurons.
- Bypass mechanism: Instead of attempting to repair damaged native synapses, LinCx installs a new electrical bypass that strengthens communication between two cells without directly modifying their existing chemical synapses.
- Protein engineering: The engineered “wires” are based on connexin proteins originally found in fish that naturally form electrical synapses. These proteins were redesigned to pair exclusively with a complementary engineered partner, minimizing unintended interactions with native mammalian connexins.
- Behavioral impact:
- In mice: Targeted LinCx connections enhanced communication within defined circuits, altered patterns of brain-wide activity, and produced measurable changes in behaviors such as social interaction and stress responses.
- In worms: Introducing the engineered synapse altered temperature-seeking behavior, demonstrating the approach’s adaptability across species.
- Improving on prior tools: LinCx addresses key limitations of existing technologies—such as off-target effects and the need for external hardware—by offering selective, durable circuit modification without continual stimulation.
Source: Duke University
Overview
Broken or disrupted neural circuits contribute to many neurological and psychiatric disorders. LinCx, developed by a team led by Kafui Dzirasa, MD, PhD, at Duke University School of Medicine, is an engineered biological system designed to form new, specific electrical synapses between pairs of neurons. This method, described in Nature on May 13, 2026, enables precise editing of neural circuits at the cellular level and offers a new avenue for restoring or reshaping circuit function.
Dzirasa describes the advance as a major step in the ability to edit brain circuits with cellular-level precision and to link those changes to behavior. Rather than attempting to fix defective synapses, the approach installs a new electrical bridge—an engineered gap junction—that enables direct signal flow between two targeted cell types.
The system relies on protein engineering of two connexins originally identified in white perch fish (Morone americana). Through targeted mutagenesis and an in vitro fluorescence assay for hemichannel docking, the team identified complementary protein pairs that dock exclusively with each other and not with the major connexins present in the mammalian central nervous system. Computational modeling guided design of a structural motif critical for selective docking and synapse formation.
In vivo validation in Caenorhabditis elegans and Mus musculus showed that LinCx can robustly strengthen electrical signaling between specified cell types, modify circuit-level activity, and produce predictable behavioral outcomes. These results illustrate the tool’s potential both for basic research—mapping causal links between circuit function and behavior—and for future therapeutic strategies aimed at internal, biological repair of damaged networks.
Unlike methods that require continuous external stimulation or risk crosstalk across cell types, LinCx is designed for stable integration and targeted action. The researchers plan next to test whether LinCx can counteract synaptic deficits produced by lifelong genetic disruptions, a step toward translational applications for neurological disease.
Other Duke authors: Elizabeth Ransey, Gwenaëlle E. Thomas, Ryan Bowman, Elise Adamson, Kathryn K. Walder-Christensen, Hannah Schwennesen, Caly Ferguson, Stephen D. Mague, Nenad Bursac.
Funding: The Burroughs Wellcome Fund, the Ernest E. Just Life Science Institute, the Hartwell Foundation, Hope for Depression Research Foundation, Howard Hughes Medical Institute, and the National Institutes of Health.
Key Questions Answered:
A: Scientists use protein engineering to design matching molecular partners. When the engineered connexin hemichannels are expressed in selected neurons, they dock with their counterpart to form a functional electrical bridge (an engineered gap junction) that allows direct electrical signaling between the cells.
A: The immediate goal is therapeutic: to correct circuit-level deficits caused by genetic or disease processes, not to arbitrarily alter personality. In mice, LinCx changed specific social and stress-related behaviors by modifying targeted circuits, but translation to humans requires extensive further research and ethical review.
A: LinCx points toward a future in which internal, biological interventions could treat broken circuits without implanted hardware. While promising, it is not yet a direct replacement for clinically used DBS; further studies are required to assess safety, durability, and therapeutic scope in humans.
Editorial Notes:
- This article was edited by a Neuroscience News editor.
- The underlying journal paper was reviewed in full.
- Additional context was added by the editorial staff.
About this neurotech research news
Author: Fedor Kossakovski
Source: Duke University
Contact: Fedor Kossakovski – Duke University
Image: Credit to Neuroscience News
Original Research: Open access. “Long-term editing of brain circuits using an engineered electrical synapse” by Elizabeth Ransey et al., published in Nature. DOI: 10.1038/s41586-026-10501-y
Abstract
Long-term editing of brain circuits using an engineered electrical synapse
Electrical signaling between distinct populations of brain cells underlies cognitive and emotional function, yet tools that selectively regulate electrical signaling between two specific components of a mammalian circuit are limited. The authors engineered an electrical synapse using two connexin proteins derived from Morone americana (white perch fish)—connexin 34.7 and connexin 35—and adapted them for mammalian circuit modulation.
Through protein mutagenesis, a new in vitro assay for hemichannel docking, and computational modeling of hemichannel interactions, the team identified a structural motif important for electrical synapse formation. They designed connexin hemichannels that dock with each other to form an electrical synapse while avoiding interaction with major mammalian connexins.
The engineered synapse was validated in vivo in both Caenorhabditis elegans and mice. It strengthened communication across paired cell types, altered neural circuit dynamics, and produced measurable behavioral changes. The authors introduce this approach—long-term integration of circuits using connexins (LinCx)—as a platform for precision circuit editing in mammals.