DNA Droplets Help Early Disease Detection
The DNA programmability was used to create and control DNA droplets formed by coacervation of sequence-designed DNAs.
A group of scientists at Tokyo University of Technology (Tokyo Tech) led by Prof. Masahiro Takinoue has developed a computational DNA droplet to recognize specific combinations of chemically synthesized microRNAs (miRNAs) that act as biomarkers of tumors.
‘In subsequent experiments, the team demonstrated simultaneous AND as well as NOT operations in AB mixture with miRNA-3 and miRNA-4 breast cancer biomarkers.’
Using these miRNAs as molecular input, the droplets can give a DNA logic computing output through physical DNA droplet phase separation.
Prof. Takinoue explains the need for such studies, "The applications of DNA droplets have been reported in cell-inspired microcompartments. Even though biological systems regulate their functions by combining biosensing with molecular logical computation, no literature is available on the integration of DNA droplet with molecular computing." Their findings were published in Advanced Functional Materials.
DNA Droplets for Disease Detection
Developing this DNA droplet required a series of experiments. First, they designed three types of Y-shaped DNA nanostructures called Y-motifs A, B, and C with three sticky ends to make A, B, and C DNA droplets.Typically, similar droplets band together automatically, while to join dissimilar droplets, a special "linker" molecule is required. So, they used linker molecules to join the A droplet with B, and C droplet; these linker molecules were called AB and AC linkers, respectively.
Their first experiment evaluated the "AND" operation in the AB droplet mixture by introducing two input DNAs. In this operation, the presence of input is recorded as 1, while its absence is recorded as 0. The phase separation of AB droplet mixture occurred only at (1,1), meaning when both input DNAs are present, suggesting the successful, and operation application.
Following this study, the scientists decided to introduce breast cancer tumor markers, miRNA-1 and miRNA-2, to AC droplet mixture as inputs for the AND operation. The AND operation was successful, implying that the computational DNA droplet identified the miRNAs.
Lastly, they created an ABC droplet mixture and introduced all four breast cancer biomarkers to this solution. The phase separation in ABC droplet depended on the linker cleavage resulting in a two-phase separation or a three-phase separation.
This property of ABC droplet enabled the researchers to demonstrate the ability to detect a set of known cancer biomarkers or detect markers of three diseases simultaneously. Prof. Takinoue, the corresponding author, sees a huge potential for computational DNA droplets.
According to him, "If a DNA droplet can be developed which can integrate and process multiple inputs and outputs, we can use it in early disease detection as well as drug delivery systems. Our current study also acts as a steppingstone for research in developing intelligent artificial cells and molecular robots."
Source: Eurekalert