Cell membranes are extraordinarily effective barriers. Their lipid bilayers protect the contents of a cell while allowing only selected molecules to enter or leave through channels, receptors, and transport proteins. For researchers trying to deliver proteins, nucleic acids, drugs, or molecular sensors into cells, this barrier is both essential and frustrating. Many delivery systems rely on passive diffusion, membrane-disrupting chemicals, viral vectors, or endocytosis, in which a cell engulfs an external object inside a vesicle. These methods can be inefficient, difficult to control, or potentially damaging. A device that could actively guide a defined cargo across the membrane, rather than simply attach to the cell or become trapped inside an endosome, would address one of the central problems in molecular delivery.

The nanosyringe described by Ding, Fan, Hao and colleagues is based on DNA origami, a method that turns DNA from a genetic information carrier into a programmable construction material. In DNA origami, a long scaffold strand is folded into a predetermined three-dimensional shape by hundreds of shorter “staple” strands. Each staple binds to specific sections of the scaffold, allowing researchers to design structures with nanometre-scale dimensions and precisely positioned functional elements. The resulting objects are not biological needles in the conventional sense. Instead, they are molecular machines assembled through predictable base pairing, with their shape, flexibility, binding sites, and mechanical movements encoded in the DNA sequence.

The syringe concept adds a functional architecture to that molecular framework. A conventional syringe has a barrel that holds cargo, a needle that reaches a target, and a plunger that applies force. At the nanoscale, those components must be recreated through molecular geometry and interactions rather than metal, plastic, or mechanical seals. A DNA origami structure can provide a hollow compartment or channel, while programmable strands and structural elements can act as gates, hinges, anchors, or moving parts. By engineering these features into one object, the researchers aim to transform membrane crossing from an uncontrolled physical event into a sequence of coordinated molecular steps.

The central challenge is not merely touching a membrane, but crossing it in a directed and useful way. A DNA nanostructure approaching a cell encounters a chemically complex surface covered with proteins, carbohydrates, and charged molecules. The membrane itself is a dynamic two-dimensional fluid, and its interior is hydrophobic, making it energetically difficult for a water-loving DNA object to pass through. A successful nanosyringe therefore needs mechanisms that help it bind to the correct surface, orient itself, interact with the lipid bilayer, and create or exploit a transient pathway. The device’s programmability is important because these stages can, in principle, be adjusted independently through changes to its DNA sequence and attached molecular components.

This strategy differs from many nanocarriers that deliver material by entering cells through vesicles. Endocytic uptake can bring a particle into the cell, but the cargo may remain enclosed in an endosome and later be degraded or recycled. Direct membrane translocation seeks to bypass that route by establishing a more immediate connection between the external environment and the cell interior. Such a pathway would be valuable for cargoes that must reach the cytoplasm, where many therapeutic and synthetic-biology functions take place. It could also allow researchers to study membrane transport under controlled conditions, separating the effects of targeting, membrane penetration, and cargo release instead of treating delivery as a single, poorly defined step.

The programmable nature of the system is what makes the work especially significant. DNA nanotechnology allows binding sequences to be selected for particular molecular targets, potentially enabling a nanosyringe to distinguish between different membrane environments. It may also permit control over when the structure opens, closes, docks, or releases its cargo. In principle, such instructions could be triggered by complementary DNA or RNA strands, changes in molecular concentration, environmental conditions, or interactions with a chosen receptor. This does not mean that a universal cell-penetrating machine has already been created. Rather, the work points toward a modular platform in which targeting and translocation behaviours can be redesigned without rebuilding the entire device from scratch.

The technology could eventually have applications in precision medicine, although substantial barriers remain before any clinical use. A practical delivery system would need to function in the complex fluids of the body, avoid rapid degradation, reach the intended tissue, distinguish diseased cells from healthy ones, and release its cargo at the correct location and dose. DNA nanostructures can be vulnerable to nucleases, immune recognition, aggregation, and clearance. Their performance may also change dramatically in the presence of serum proteins and crowded biological surroundings. Scaling up production with consistent quality would present another challenge. These issues are familiar across the field of DNA nanotechnology, and the nanosyringe concept does not eliminate them; it offers a new architecture in which they can be investigated systematically.

Beyond medicine, the device could become a tool for building more sophisticated artificial cells and molecular robots. Researchers have long sought ways to make synthetic compartments exchange materials with their surroundings in a controlled fashion. A programmable nanosyringe could contribute to artificial systems that sense their environment, import selected molecules, and respond through predefined chemical circuits. It could also help scientists explore how membrane permeability, mechanical force, and molecular recognition operate together. Because DNA origami structures can be imaged, modified, and produced with sequence-level precision, they provide an experimental platform for testing design principles that are difficult to isolate in natural membrane proteins.

The study’s broader message is that DNA nanotechnology is moving beyond static shapes and passive carriers toward active devices with defined tasks. A DNA origami nanosyringe does not simply provide a container for cargo; it is conceived as a coordinated molecular instrument that can engage a membrane and direct translocation. Whether that vision leads to reliable therapeutic delivery will depend on future experiments addressing efficiency, selectivity, safety, and operation in living organisms. For now, the work demonstrates how programmable molecular construction can be paired with one of biology’s most demanding engineering problems. By turning a familiar macroscopic tool into a nanoscale DNA machine, the researchers have offered a striking example of how synthetic structures may one day perform targeted operations inside living systems.

Subject of Research: Programmable DNA origami nanosyringe for directed membrane translocation and molecular cargo delivery

Article Title: A programmable DNA origami nanosyringe for directed membrane translocation

Article References: Ding, L., Fan, S., Hao, X. et al. A programmable DNA origami nanosyringe for directed membrane translocation. Nat. Nanotechnol. (2026). https://doi.org/10.1038/s41565-026-02249-3

Image Credits: AI Generated

DOI: https://doi.org/10.1038/s41565-026-02249-3

Keywords: DNA origami, nanotechnology, nanosyringe, membrane translocation, molecular machines, targeted delivery, synthetic biology, nanomedicine

Membrane transport is one of biology’s most fundamental operations. Small molecules can sometimes cross membranes by diffusion, but many biological tasks require active, precisely directed movement. Nature has evolved molecular machines that use mechanical forces to pierce membranes or inject cargo into target cells. Certain bacteria, for example, deploy contractile injection systems that function like microscopic spring-loaded devices. At a very different scale, intracytoplasmic sperm injection introduces a sperm cell directly into an egg using a fine needle. The Stuttgart researchers adapted this general principle—mechanical penetration followed by controlled delivery—to the nanoscale using DNA molecules.

The nanosyringe is built from DNA origami, a technique in which long DNA strands are folded into predetermined three-dimensional shapes with the help of shorter “staple” strands. Although DNA is best known for storing genetic information, its predictable base-pairing rules also make it a versatile construction material. By designing specific sequences and geometries, researchers can create molecular structures that act as hinges, clamps, channels and moving components. In this case, the DNA framework forms a membrane-anchoring base and a mobile needle linked by a reversible sliding mechanism.

Once attached to a lipid membrane, the device can be activated through DNA strand-displacement reactions. In these reactions, a new DNA strand binds to an exposed sequence and displaces another strand from a double helix. The researchers used this programmable chemistry to drive the nanosyringe’s needle forward and backward. The resulting motion is not a random fluctuation but a controlled mechanical cycle: the needle advances through the membrane, carries or exposes molecular cargo on the other side, and later retracts. This gives the system temporal control over transport that passive diffusion through pores cannot provide.

The work was demonstrated in synthetic cell-like compartments surrounded by lipid membranes. These membrane-bound systems are widely used in synthetic biology because they reproduce selected features of living cells without the complexity of a complete organism. By operating at the boundary between the outside environment and the compartment interior, the nanosyringe can introduce functional molecules precisely where they are needed. Its reversible action is particularly important because many artificial delivery systems disrupt membranes permanently, causing leakage and making it difficult to control subsequent reactions.

The researchers showed that the nanosyringe could do more than move molecular material from one side of a membrane to the other. It also acted as a programmable trigger for biochemical activity inside synthetic cells. In one demonstration, the device initiated DNA hybridization chain reactions at the membrane. These reactions use a series of designed DNA strands that assemble into extended structures once a starter sequence is introduced. Because the starter can be delivered at a selected time and location, the nanosyringe offers a way to spatially organize molecular assembly rather than allowing it to occur uniformly throughout a compartment.

The platform was also used to activate RNA transcription. The researchers transported promoter activators into membrane-bound compartments, where the molecules could engage the transcription machinery and initiate the production of RNA. In another experiment, the device delivered catalytic DNAzymes—synthetic DNA molecules capable of promoting specific chemical reactions. The DNAzymes selectively cleaved RNA substrates inside the compartments, demonstrating that mechanically controlled membrane entry can regulate downstream molecular functions. Together, these tests show that the nanosyringe can serve as an interface for programming reactions, not merely as a passive cargo carrier.

The technology introduces a mechanical dimension to programmable DNA nanotechnology, which has traditionally relied heavily on molecular recognition, hybridization and chemical binding. Instead of responding only to the presence of a target sequence, the nanosyringe physically interacts with a membrane and changes its position through designed motion. Such behavior could eventually allow networks of DNA devices to communicate with synthetic cells, coordinate the release of proteins or nucleic acids, and respond to changing biochemical conditions. The system may also help researchers build artificial cells whose internal reactions can be started, stopped or localized from outside.

Several challenges remain before the concept can be translated into practical biomedical applications. Future versions will need to transport larger and more diverse cargos, including proteins, therapeutic nucleic acids and molecular sensors. Researchers will also need to improve the device’s efficiency, stability and selectivity in complex biological fluids, where membranes contain many different lipids and proteins. The precision demonstrated in synthetic compartments may be difficult to reproduce in living cells, whose surfaces are dynamic and actively remodeled. Nevertheless, the reversible nanoscale penetration mechanism establishes a new design strategy for engineered biointerfaces.

The Stuttgart study presents the DNA origami nanosyringe as a compact molecular machine capable of combining anchoring, mechanical motion, membrane penetration and biochemical control. By merging the programmability of DNA chemistry with the direct force of a nanoscale actuator, the device offers a new way to communicate with synthetic cells and potentially biological systems. The broader significance lies in treating molecular transport as an active, addressable process: cargo does not simply diffuse across a barrier, but is delivered through a programmed mechanical event. That approach could help transform artificial cells from passive chemical containers into dynamic systems capable of controlled interaction with their surroundings.

Subject of Research: A programmable DNA origami nanosyringe for mechanically controlled molecular transport across synthetic cell membranes.

Article Title: Programming membrane transport

News Publication Date: 11-Aug-2026

Web References: https://www.nature.com/articles/s41565-026-02249-3

References: DOI: 10.1038/s41565-026-02249-3; Nature Nanotechnology

Image Credits: Copyright: University of Stuttgart, 2nd Physics

Keywords: DNA origami, nanosyringe, nanotechnology, synthetic cells, membrane transport, molecular machines, synthetic biology, DNA nanotechnology, molecular therapeutics, engineered biointerfaces