Shulan Xiao watched as the first electrical trace flickered across the screen—a clean, continuous signal from inside a living neuron, recorded without piercing a single membrane. At Purdue University, in collaboration with the University of Illinois Urbana-Champaign, Xiao and her team have engineered a new kind of biohybrid device: artificial DNA origami tiles that embed themselves into neuronal membranes like molecular gatekeepers, opening stable nanopores that allow intracellular-like electrical recordings—without damaging the cell. This breakthrough, published in Nature Nanotechnology, could redefine how scientists study the brain and treat neurological conditions.
For decades, neuroscientists have relied on patch-clamp pipettes and sharp electrodes to measure ion flow across cell membranes—the electrical language of neurons. But these tools come at a cost: they rupture the membrane, disrupt cellular function, and often kill the cell within minutes. "The electrical signals that matter most—the subthreshold potentials, the synaptic and dendritic dynamics, the slow voltage fluctuations that drive learning—are signals one can accurately record only intracellularly," says Krishna Jayant, senior author and head of the Jayant Nano Neurotechnology Lab. "Yet the dominant tools we have require you to rupture the membrane to access them."
The solution emerged from an unexpected fusion of nanotechnology, structural biology, and neurophysiology. Drawing on DNA’s programmable self-assembly, biocompatibility, and atomic precision, Jayant and his colleagues—including Leopold Green at Purdue and Aleksei Aksimentiev’s computational team at Illinois—designed DNA tiles that spontaneously insert into live neuronal membranes. These synthetic nanopores act as stable, ion-conducting channels, mimicking natural ion channels while serving as permanent electrical access points. In experiments, the tiles enabled two-photon-guided recordings of spontaneous intracellular-like action potentials in cortical neurons—continuous, high-fidelity signals lasting over an hour, far beyond the survival time of traditionally patched cells.
Beyond monitoring, these DNA nanopores may also serve as delivery channels. The team demonstrated their potential to transport membrane-impermeable drugs directly into neurons, opening possibilities for targeted therapies in epilepsy, chronic pain, or neurodegenerative diseases. Because the tiles integrate without disruption, they could allow long-term neural interfacing—critical for brain-computer interfaces or monitoring neural circuits over days or weeks.
This "outside-looking-in" approach marks a paradigm shift: listening to a neuron’s inner electrical world not by breaking in, but by building a doorway. As neuroscience moves toward understanding dynamic brain networks, tools that preserve cellular integrity will be essential. These DNA tiles don’t just offer a new method—they offer a new philosophy: that the most intimate measurements can be made with the gentlest touch.