The sensation of touch, from a gentle tap to the feeling of clothing against skin, relies on a complex network of nerve cells and specialized proteins. Scientists have long known that a protein called PIEZO2 plays a crucial role in detecting touch, but the precise mechanisms behind its function—and how it differs from a related protein, PIEZO1—remained a mystery. Now, research published in Nature on March 4, 2026, is shedding new light on how PIEZO2 detects specific types of force, potentially opening avenues for understanding and treating sensory disorders. Understanding PIEZO2 mutations and sensory disorders is a growing area of research.
The study, conducted by researchers at Scripps Research, reveals that PIEZO2’s ability to sense touch isn’t simply about its shape, but as well about how it’s physically connected within the cell. This connection, or “tether,” to the cell’s internal scaffolding—the actin cytoskeleton—is key to its function. This discovery builds on previous work by Professor Ardem Patapoutian, who in 2021 shared the Nobel Prize in Physiology or Medicine for the discovery of PIEZO1 and PIEZO2, ion channels that open in response to mechanical force.
“Touch is one of our most fundamental senses, yet we didn’t fully understand how it’s processed at the molecular level,” says Patapoutian, Presidential Endowed Chair in Neurobiology at Scripps Research. “We wanted to see how the structure of PIEZO2 shapes what a cell can actually feel.” The research team employed a cutting-edge technique called minimal fluorescence photon flux (MINFLUX) super-resolution microscopy to observe the protein’s movements in living cells with nanometer-scale precision—a level of detail previously unattainable.
How PIEZO2 Differs from PIEZO1
Both PIEZO1 and PIEZO2 are mechanically gated ion channels, meaning they open in response to physical force, allowing charged particles to flow into the cell and generate electrical signals. Still, they respond to different types of force. PIEZO1 is more sensitive to broad mechanical stresses, like stretching, while PIEZO2 is specialized for detecting localized indentations—a light tap, for example. PIEZO ion channels are critical for mechanosensory responses.
The Scripps Research team found that PIEZO2 is intrinsically stiffer than PIEZO1. Crucially, PIEZO2 is tethered to the actin cytoskeleton via a protein called filamin-B. When a cell is poked, this tether helps convey the force to PIEZO2, making it more likely to open. Interestingly, simple membrane stretching doesn’t activate PIEZO2 when this tether is intact. This suggests that the tethering mechanism is essential for PIEZO2’s sensitivity to localized touch.
“Cryo-EM gives us beautiful structural snapshots, but it can’t present us how a protein moves in its native cellular environment,” notes Eric Mulhall, a postdoctoral fellow in Patapoutian’s lab and first and co-senior author of the study. The team’s use of MINFLUX, combined with electrical recordings, allowed them to directly link PIEZO2’s structural changes to its activity.
Implications for Sensory Disorders
Disrupting the connection between PIEZO2 and filamin-B in mouse sensory neurons reduced the channel’s sensitivity to indentation. Unexpectedly, it also allowed PIEZO2 to respond to membrane stretch—a force it normally ignores. This finding highlights the importance of the tethering mechanism in fine-tuning the channel’s sensitivity.
Mutations in PIEZO2 have been linked to sensory disorders affecting touch and body awareness, while mutations in filamin-B are associated with skeletal and developmental conditions. Labeling PIEZO2 activity in the peripheral nervous system is a key area of study. By clarifying how these proteins interact, this research provides a framework for interpreting genetic findings and guiding future research into these conditions. The team’s findings suggest that cells can fine-tune their sensitivity to touch by controlling how these channels are integrated within the cell.
“Our results shift the perspective on how touch begins at the molecular level,” explains Patapoutian. “A protein’s physical connections inside a cell determine what kinds of forces it can sense. That’s a new way of thinking about how we feel the world around us.”
Further research will focus on exploring the role of filamin-B and the PIEZO2 tethering mechanism in various tissues and disease states. Understanding these fundamental processes could lead to new therapeutic strategies for sensory disorders and other conditions linked to impaired touch sensation.
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