( Professor Lewis Rothberg of the Univers...)Quick and Inexpensive DNA Testing,Health

Professor Lewis Rothberg of the University of Rochester was awarded a NYSTAR grant to resume his research on a recent discovery by one of his team members//. He along with his colleagues contributed to a remarkable research. They developed cost effective methods to study DNA material in quick simple steps. This will ensure better health and clean drinking water and make sure that we eat uncontaminated food. Rothberg's novel method can even be used in several other applications like assisting forensic experts to pinpoint criminals, and in earmarking potentially dangerous genetic sequences in medical research field. Rothberg's ground breaking research paves the way to identify sequences in genotypes in any DNA sample rapidly and cost effectively.

The technology is a novel fluorescent DNA screening assay, which rapidly determines whether specific DNA target sequences are present in an analyte. In simple terms, the analyte contains the DNA target sequences as well as other DNA sequences, and the assay filters out only the targets. Professor Rothberg's assay is based on the electrostatic properties of DNA.

The principle underlying the method is that single-stranded DNA and double-stranded DNA have significantly different affinities for attaching to ionically charged gold nanoparticles. Because ions have electric charges, having gained or lost electrons, they attract their opposites. An anion with a negative electric charge will attract positive charges, a cation with a positive charge will attract negative charges. Single-stranded DNA adsorbs on negatively charged citrate ions on the gold nanoparticles while double-stranded DNA does not. Given that both single-stranded and double-stranded DNA are (nominally) negatively charged, this proven phenomenon intrigues the research group.

The new assay determines whether a fluorescently-tagged short probe sequence of single-stranded DNA matches a sequence in the target analyte. When it does not,
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