- Researchers create bacteria-based transistors that perform logic operations and form circuits.
- Circuits are assembled via printed bacterial colonies on agar, enabling biological computation.
- Potential applications include plant sensors and low-power environmental monitoring systems.
Researchers from the Massachusetts Institute of Technology (MIT) engineered bacteria that can function as transistors and form circuits for environmental monitoring.
The team used the bacterium Pantoea agglomerans to create two types of transistors, one that can be switched on by a molecule called OC-6 and another that the molecule switches off. Each transistor also detects the presence of a target molecule called OC-12. Depending on whether that molecule is present, and whether the switch is active, the transistors produce a different output molecule, called OHC-14. Three strains of the same bacterium were used to create relays that translate the OHC-14 signal into an output that can be fed into another transistor.
Circuits are created by printing colonies of bacteria onto plates containing agar, a growth medium. Each colony is printed about 5 millimeters from the nearest one, allowing signals to travel only to the nearest colony, which then relays them to the next one, so information flows only in one direction.
“We’ve built some initial computer architecture components that are commonly used, but any operation can be built with these five strains,” said Hamid Doosthosseini, an MIT postdoc, in a press release.
In the study, the researchers demonstrated a transistor that can perform several types of logic operations depending on its location in the circuit layout, including “multi-input” “or” and “imply” gates. They also combined the transistors to create more complex circuits that can add up two signals, process more signals simultaneously or function as a demultiplexer. The largest circuit contained 24 bacterial colonies wired together to add two inputs.
The researchers hope to design circuits that could be applied to plant leaves or roots to detect and respond to different environmental stressors. The circuits take about eight hours to perform each calculation, which is fast enough for biological applications, said Christopher Voigt, head of MIT’s Department of Biological Engineering, in a press release. “We’re not trying to replace computers, but rather put computational control into biology. If you have bacteria on the root of a plant, or the plant itself is doing the computing, running a simple calculation overnight is fast enough relative to a growth season.”
This kind of work sits at the intersection of sourcing, electronics and logistics in a very different sense than conventional hardware manufacturing. Instead of building devices from silicon, metals and packaged components, the researchers are effectively sourcing living materials with programmable behavior and arranging them into a functional architecture. That shift matters because it changes what counts as a circuit element: in this case, a bacterial colony can act as a transistor-like unit, and its output is not an electrical current but a molecular signal that can be passed along to another colony.
For readers thinking about the practical side of emerging electronics, the most striking feature is the modularity. The bacterial system is not a single one-off sensor; it is a set of repeatable units that can be arranged into larger networks. That is a familiar idea in mobile electronics and digital systems, but here it is translated into biology. The result is a platform that could eventually support localized decision-making in living environments, such as leaves, roots or soil-adjacent systems, where fast enough does not necessarily mean instant, but simply timely enough to guide a biological response.
The logistics of the platform are also unusual. Rather than a factory floor or chip fab, the circuit is built by printing colonies onto agar in a controlled spacing pattern. That layout creates a one-way flow of information, which is important because it reduces ambiguity in how signals propagate. In a broader engineering sense, the study demonstrates that biological systems can be organized with the same disciplined thinking used in electronics: control signal direction, define input-output behavior and chain components together into more complex operations.
The same design logic appears in the other two studies highlighted here. The forgetful antiferroelectric device shows how materials science can be used to create AI hardware that naturally handles short-term memory and forgetting, two features that are highly relevant for time-series processing. The high-entropy semiconductor demonstrates how mixing can be used to tune electronic and thermal behavior at once, which is especially promising for devices that need to manage heat as carefully as they manage charge. Together, these studies point to a common theme in next-generation hardware: performance increasingly depends on the ability to shape matter at the molecular or atomic level, whether the material is living, crystalline, or somewhere in between.
Another important takeaway is that these advances are not about replacing established computing platforms. Instead, they open room for specialized systems that work where conventional computers are less practical. A plant-root sensor, for example, does not need the speed or general-purpose flexibility of a laptop. It may need a small, embedded, low-power system that can monitor a condition and respond at a biological pace. Likewise, memory devices that forget recent inputs may be useful precisely because they do not retain everything forever; they can emphasize patterns that matter now rather than storing a complete history.
As biology and electronics continue to overlap, the boundary between computation and environment may become more fluid. That does not mean every sensor will become a living circuit, but it does suggest a future in which engineers choose from a broader menu of materials and behaviors. In that future, sourcing the right component may mean choosing a bacterium, an oxide, or a hybrid device depending on the application.
Takeaways
- - Bacterial transistors show that living cells can be organized into circuit-like systems.
- - The key value is not speed alone, but compatibility with biological environments.
- - Forgetting, entropy, and thermal control can be engineered as useful features, not flaws.
- - These developments may support environmental monitoring, edge AI and low-power sensing.
- - The next wave of electronics may rely as much on material behavior as on device miniaturization.
Disclaimer: This article may have been created with AI assistance and reviewed by our editorial team. It is provided for general informational purposes only. Readers should verify information independently before relying on this content.
References
[1] H. Doosthosseini, H. Chen, & C.A. Voigt. Living circuit boards built by printing bacterial transistors. Nat Chem Biol (2026). https://doi.org/10.1038/s41589-026-02300-3
[2] T. Kwon, M. Jeong, S. I. Hwang, et al. Volatile ZrO2 Antiferroelectric Tunnel Junctions for Rapid, Energy-Efficient Physical Reservoir Computing. Advanced Science (2026): e76692. https://doi.org/10.1002/advs.76692
[3] R.A. Robinson, T. Karimzadeh Sabet, F. Marques dos Santos Vieira, et al. High-entropy design of transition metal oxide semiconductors with ultra-low thermal conductivity. Commun Mater 7, 198 (2026). https://doi.org/10.1038/s43246-026-01103-2
