Researchers develop new method for detection of specific DNA sequences

UCLA researchers develop new method for detection of specific DNA sequences
New DNA sequencer. In the presence of the DNA or RNA sequence of interest, beads are driven toward a sensing pore (left), which they block (right) producing a large signal easily readout with a handheld device. Credit: Jacob Schmidt

(Phys.org)—The detection of specific DNA sequences is central to the identification of disease-causing pathogens and genetic diseases, as well as other activities. But current detection technologies require amplification by polymerase chain reaction (PCR), fluorescent or enzymatic labels, and expensive instrumentation.

Now, researchers from the UCLA Henry Samueli School of Engineering and Applied Science have developed a device that amplifies the size of a by coupling it to microscale beads that are one-hundredth the size of a human hair. In the presence of the specific DNA sequence to be detected, the beads will produce a large electronic signal that is easily read out by a simple device. This signal is generated because the binding of the specific DNA sequence to the beads gives them a negative charge, attracting them to a small pore, which they block. The electrical measurement of this blockage can be indicated by a simple light-emitting diode in a compact handheld device.

The simplicity and compactness of this new technology may enable low-cost handheld devices for without the need for molecular amplification or any additional instrumentation. The method could be used in screening for genetic diseases, food-safety procedures, forensic sciences and other applications.

The research is published online in the peer-reviewed Journal of the American Chemical Society and will be included in a forthcoming print issue of the journal.

Citation: Researchers develop new method for detection of specific DNA sequences (2012, October 2) retrieved 16 April 2024 from https://phys.org/news/2012-10-method-specific-dna-sequences.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

A better test to detect DNA for diagnosing diease, investigating crimes

0 shares

Feedback to editors