Electronic zippers control DNA strands
London: Scientists have invented a new way to zip and unzip DNA strands using electrochemistry.
The binding and unbinding mechanism of Deoxyribonucleic acid (DNA) strands is vital to natural biological processes and to the polymerase chain reactions used in biotechnology to copy DNA for sequencing and cloning.
The improved understanding of this process, and the discovery of new ways to control it, would accelerate the development of new technologies such as biosensors and DNA microarrays that could make medical diagnostics cheaper, faster and simpler to use.
The most common way of controlling the binding of DNA is by raising and lowering temperature in a process known as heat cycling. While this method is effective, it requires bulky equipment, which is often only suitable for use in laboratories.
The development of alternative methods to control the DNA binding process, for example with changes in acidity or the use of chemical agents, would be a significant step towards lab-on-a-chip devices that can rapidly detect disease.
However, until now, no method has been shown to enable fast, electrochemical control at constant temperatures without the need for dramatic changes in solution conditions or modifying the nucleotides, the building blocks of DNA.
A research team from the National Physical Laboratory and the University of Edinburgh in UK used a class of molecules called DNA intercalators which bind differently to DNA, depending on whether they are in a reduced or oxidised state, altering its stability.
These molecules are also electroactive, meaning that their chemical state can be controlled with an electric current.
Electrodes apply a voltage across a sample containing double strands of DNA which are bonded to the electroactive chemicals. This reduces the chemicals (they gain electrons), decreasing the stability of the DNA and unzipping the double helix into single strands.
Removing the voltage leads to the oxidisation of the chemicals and the DNA strands zip back up to re-form the familiar double helix structure. Put simply, with the flick of a switch, the oxidation state of the molecules can be changed and the DNA strands are zipped together or pulled apart.
The details of the process were published in the Journal of the American Chemical Society.
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