Nanostructured Integrated Circuit recognizes the nature and severity of cancer

A team of researchers at the University of Toronto have used nano materials at low cost microchip sensitive enough to quickly determine the type and severity of a cancer patient, so that the disease in May develop already discovered earlier treatment more effective. Their work, reported in two articles published in ACS journals Nano and Nature Nanotechnology, could usher in an era of inexpensive diagnostic and sophisticated molecular commonplace

The new research "device can easily recognize the signature of biomarkers that the presence of cancer at the cellular level, type, clearly differentiate these biomolecules - Gene aggressive or benign forms of the disease state and sub-types of cancer - are usually only present in low concentrations in biological samples. The analysis can be completed in 90 minutes, which is a significant improvement over existing methods of diagnosis, which usually last several days.

"Today, a room filled with computers need to evaluate a sample of clinically relevant biomarkers of cancer and the results are not fixed quickly," said co-team leader Shana Kelley. "Our team was able to biomolecules measured on a chip the size of your fingertip and analyze the sample in half an hour. The units used for this analysis are needed, can be contained in one unit the size of a BlackBerry.

The device nanoelectrode be reproduced, Kelley is assistant to Edward Sargent, and created their students the ability to detect genes associated with disease without the use of PCR of DNA from low level. The electrodes, which are the core of the device have to recognize a novel nano-structured, highly branched form attomolar where concentrations of DNA. Using electrode arrays, each of them were in varying degrees of branch nanostructured that investigators in the post, a detection device in the DNA molecules to build more than six orders of magnitude to overcome the problem of dynamic range - the ability to both common and rare recognition molecules - which occurs in other devices.

Researchers made these devices using a standard production of micro-chip, known as photolithography, the grid electrode core is necessary to measure several biomarkers simultaneously, then pushing another technique known as galvanic deposition, used to create the branched nanostructures on electrodes that control the size of each electrode by varying the period took place on the galvanic. With electrodes available, investigators were then coated with different DNA binding molecules called peptide nucleic acids or PNAs which can bind to designate a sequence of specific genes. If a piece of DNA binds to complementary DNA or RNA molecule, it triggers a chemical reaction, the electrical signal generated by the electrodes associated changed.

With their device, the researchers analyzed samples of messenger RNA from biopsies of prostate cancer. Their analysis showed that the device can detect the characteristic gene fusions in prostate cancer. More importantly, the device was able to distinguish between gene fusions associated with either fast or slow-growing forms of prostate cancer.

The document describes the structure of this Nanobiosensors entitled "Programming the detection limits of biosensors, controlled nanostructuring on. A summary of this work is on the magazine's website Web Site.

Recognize the document detailed the use of Nanobiosensors and characterize cancer is called "direct profiling of cancer biomarkers in tumor tissue nanostructured Multiplexed Microelectrode Integrated Circuit."