Recent research is exploring the possibility of building extremely small machines from DNA, capable of functioning at the molecular level. These systems are still in the experimental stage, but could open new directions in medicine and technology, if the current technical challenges are overcome.
A team of researchers is analyzing the use of DNA not only as a carrier of genetic information, but also as a building material for molecular robots. These structures are designed to operate on a very small scale, with the long-term goal of circulating through the blood, identifying diseased cells, including cancer cells, and delivering treatments with high precision.
In parallel, researchers believe that such systems could contribute to the development of data storage and computing devices on a molecular scale.
However, the technology is in its infancy. Most DNA robots are still in the concept stage and not practical tools.
However, the field is advancing as scientists learn to design DNA structures that can bend, fold and move in a controlled manner.
A recent review describes several design strategies: some systems use rigid joints for stability, while others use flexible components or folding structures inspired by the origami technique. Adapting the principles of classical robotics to the molecular scale allows the creation of devices capable of performing specific tasks with better precision.
However, controlling these robots represents a major challenge. They must function in an environment dominated by constant molecular collisions.
To overcome this limitation, researchers use control methods based on chemistry and physics. These include biochemical techniques such as DNA strand displacement (a mechanism by which one DNA sequence replaces another), but also external stimuli, such as electric fields, magnetic fields or light.
By programming the interactions between different DNA sequences, researchers can trigger precise movements or shape changes so that the robot follows predefined molecular instructions.
The potential applications go beyond the laboratory.
In medicine, these robots could act as a kind of “nano-surgeon”, identifying specific targets and delivering treatment directly to them.
In theory, such precision could increase the effectiveness of therapies and reduce damage to healthy tissue.
DNA-based devices capable of capturing viruses such as SARS-CoV-2, which causes Covid-19, have also been studied, suggesting the possibility of systems that combine diagnosis and treatment.
Outside of medicine, technology could also influence manufacturing processes at the atomic level. DNA robots could function as programmable templates that position nanoparticles with subnanometric precision, that is, on a scale smaller than a billionth of a meter. This could facilitate the development of molecular computers and optical devices with performances difficult to obtain by current methods.
Despite the advances, there are important limitations. Brownian motion, that random movement of particles on a microscopic scale, makes it difficult to achieve precise control.
In addition, many of today’s systems are static and isolated, with limited functionality. The field does not yet have the necessary infrastructure, such as detailed databases on the mechanical properties of DNA or simulation tools to accurately predict the behavior of these structures.
The authors of the recent analysis believe that overcoming these obstacles will require collaboration between several fields. They point to the development of standardized libraries of DNA components, the use of artificial intelligence (AI) for design, and the improvement of biofabrication methods as essential steps for scaling up and applying this technology.
The study was carried out by researchers from the Harbin Institute of Technology in China, and summarizes the current state of research in the field of DNA-based molecular robots.
