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Nanopore Method for DNA Sequencing

April 7th, 2006 Medgadget Editors Genetics, Nanomedicine


Here’s another example on how nanotechnology might revolutionize medicine. Developed by a team of physicists at the University of California, San Diego, the method to sequence DNA as it passes through nanopore has been shown to be feasible, fast and, probably, cheap:

The paper, published in the April issue of the journal Nano Letters, describes a method to sequence a human genome in a matter of hours at a potentially low cost, by measuring the electrical perturbations generated by a single strand of DNA as it passes through a pore more than a thousand times smaller than the diameter of a human hair. Because sequencing a person’s genome would take several months and millions of dollars with current DNA sequencing technology, the researchers say that the new method has the potential to usher in a revolution in medicine.
“Current DNA sequencing methods are too slow and expensive for it to be realistic to sequence people’s genomes to tailor medical treatments for each individual,” said Massimiliano Di Ventra, an associate professor of physics at UCSD who directed the project. “The practical implementation of our approach could make the dream of personalizing medicine according to a person’s unique genetic makeup a reality.”
The physicists used mathematical calculations and computer modeling of the motions and electrical fluctuations of DNA molecules to determine how to distinguish each of the four different bases (A, G, C, T) that constitute a strand of DNA. They based their calculations on a pore about a nanometer in diameter made from silicon nitride-a material that is easy to work with and commonly used in nanostructures-surrounded by two pairs of tiny gold electrodes. The electrodes would record the electrical current perpendicular to the DNA strand as the DNA passed through the pore. Because each DNA base is structurally and chemically different, each base creates its own distinct electronic signature.

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Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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