Key Takeaways
- MIT researchers developed a 50-cent electrochemical sensor for detecting specific disease genes, making diagnostics more affordable and accessible.
- The sensor uses a DNA-coated electrode and a CRISPR-based enzyme called Cas12 to generate a unique electrical signal when it interacts with target genes.
- A new protective coating of polyvinyl alcohol (PVA) allows the sensors to be stored for up to two months at room temperature, overcoming previous limitations.
- The technology can be adapted to test for various infectious diseases and cancers using samples like urine or saliva, enhancing at-home testing possibilities.
- A startup is being established to test these durable sensors with patient samples in real-life settings, aiming for widespread use beyond clinics.
A recent advancement at the Massachusetts Institute of Technology (MIT) may soon enable complex medical diagnostics to be as affordable and convenient as a blood glucose test. A team of researchers has created a 50-cent electrochemical sensor that can identify specific disease genes. Notably, it can be stored for up to two months at room temperature.
How the Technology Works
The technology employs a DNA-coated electrode and utilizes a CRISPR-based enzyme called Cas12. When the sensor comes into contact with a target gene from a virus or cancer cell, the enzyme activates and starts to break down the DNA on the electrode. This process generates a unique electrical signal, showing a positive result. However, a significant challenge has been the vulnerability of the DNA coating, which previously restricted the sensors' usable life to just a few days.
A Game-Changing Solution
Led by Professor Ariel Furst, the MIT team addressed this issue by applying a straightforward, low-cost coating of polyvinyl alcohol (PVA), a common type of polymer. The PVA serves as a protective layer, stabilizing the fragile DNA and enabling the sensors to be stored and shipped without needing refrigeration. After being kept for two months at temperatures as high as 150 °F (65.56 °C), the team confirmed the sensors could still accurately identify a gene linked to prostate cancer.
"Our aim is to provide diagnostics that are not easily accessible, and we hope to create a sensor that can be used right where people are. You wouldn’t even have to visit a clinic; it could be done at home." — Professor Ariel Furst.
Broad Applications
The flexibility of this platform means it can be modified to test for a variety of infectious diseases, including HIV and HPV, as well as different types of cancer using samples such as urine or saliva. A group from Furst’s lab is currently establishing a startup via MIT’s delta v accelerator to start testing these durable sensors with patient samples in real-life settings.
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