Navigation Links
A New Inexpensive Technology for Multiplexed Detection

An inexpensive method to screen for millions of different biomolecules (DNA, proteins, etc.) has been created by MIT researchers. This single sample for many purposes// technology makes possible the development of low-cost clinical bedside diagnostics.

The work, based on tiny customizable particles, could also be used for disease monitoring, drug discovery or genetic profiling. Even though the particles are thinner than the width of a human hair, each is equipped with a barcoded ID and one or more probe regions that turn fluorescent when they detect specific targets in a test sample.

Using a new, extremely versatile technique, the researchers can produce a "virtually unlimited" array of particles to test for DNA, RNA, proteins and other biomolecules, said Daniel Pregibon, a graduate student in chemical engineering at MIT.

Pregibon is the lead author of a paper on the work that will appear in the March 9 issue of Science.

He and co-author Patrick Doyle, the Doherty Associate Professor of Chemical Engineering, believe their particles could become an effective and inexpensive way to perform medical diagnostic tests at a patient's bedside.

Current testing methods are cost-prohibitive for bedside use, Pregibon said. The MIT particles are inexpensive to manufacture, and their results are as accurate, if not more so, than the results from more expensive systems, he said.

The particles offer a new way to do "multiplexed detection"-testing a single sample for multiple targets. In the laboratory, a common (but expensive) multiplexing technique involves a planar microarray-a flat surface with many spotted probes that each test for different targets. The MIT researchers are taking this approach away from planar surfaces onto free-floating particles.

With the tiny particles, it is much easier to custom-design each biological test, said Doyle. "It's very easy to tailor what you give a customer. Y ou could have 100 types of particles and mix them together," he said.

The researchers' particle fabrication method gives them exquisite control over the particles' shape and chemical characteristics.

As two streams of monomers (liquid precursors loaded with fluorescent dye or molecular probe) flow side by side through a microfluidic device, ultraviolet light repeatedly strikes the streams. A chemical reaction initiated by the light causes the liquid to solidify, forming a single particle with two distinct ends. Each particle takes on the shape of a "mask" (similar to a transparency film) through which the UV light is aimed.

One end of each particle is a fluorescent "dot-pattern" barcode that reveals what the target molecule of the particle is, and the other end is loaded with a probe and only turns fluorescent if the target molecule is present. The particles can also be designed to each test for multiple targets, by adding several unique regions.

"We can make the particles, encode them and add functionality all in a single step," said Pregibon.

When a mixture of particles is added to a test sample, target molecules (DNA, proteins, etc.) will bind to the region of the particles containing the corresponding probe. This interaction can be detected by fluorescence, which is brighter when more of the target is present.

To rapidly "read" the particles, the researchers designed a custom "flow cytometer" using a microfluidic device and standard microscope. In this flow-through system, the oblong, disk-like shape of the particles ensures that they are precisely aligned for accurate scanning. Each time a particle flows past a detector, its barcode is read and the corresponding target is quantified.

The microparticles are inexpensive because they can be produced efficiently in a single step. The design of the particles also makes the scanning devices cheaper. With multiple distinct regions, the barcode can be read and the target quantified using a single fluorescent color, which greatly simplifies detection.

The particles are also unique in that they are made of a spongy polymer "hydrogel" called poly(ethylene glycol). That polymer enhances the sensitivity of the test because it is porous, allowing the target molecules to diffuse into it.

For the Science paper, the researchers created particles with DNA probes attached at one end. They demonstrated that the particles could accurately and reproducibly detect the presence of multiple target DNA sequences, and they anticipate similar results with RNA, proteins and cytokines.

The researchers are focusing on bedside diagnostics and "theranostics"-the emerging concept of providing personalized diagnostic therapy. This method for tailoring therapies to each patient could be a breakthrough for treating diseases like cancer and cardiovascular disease. The particles could also be used to genetically profile individual patients and screen for bioterrorism or other hazardous environmental agents.

Source-Eurekalert
PRI
'"/>




Related medicine news :

1. Inexpensive ALL Follow-Up Test Developed By St. Jude Researchers
2. Quick and Inexpensive DNA Testing
3. Wal-Mart Mexico Makes Shelf Space for Inexpensive Generic Drugs
4. New Technology In MRI Scan Help Test Brain Cancer Therapy
5. Emergence Of New Gene Scanning Technology In Disease Research
6. Scientists Develop New Technology To Find About Human Ancestors’ Teet
7. Scientists Consider About New Technology Called Nanotechnology
8. Prostate Cancer Can Be Treated By Application Of LASER Technology
9. Georgia Institute of Technology develops doppler Vein finder
10. Novel Technology For Early Detection of Gastrointestinal Cancer
11. Winter Blues Treated by Breakthrough Lighting Technology
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/29/2017)... ... 29, 2017 , ... Patients interested in receiving quick and ... Jamie Cameron, with or without a referral. The FASTBRACES system is valued for ... each patient’s case, treatment with the FASTBRACES system could be completed in 120 ...
(Date:3/29/2017)... ... March 29, 2017 , ... ... as it continues developing an ANSI-approved, consensus-based American National Standard for Good ... to publish the first ANSI-approved GMP standard for dietary supplements this spring, ...
(Date:3/29/2017)... ... March 29, 2017 , ... Altima Technologies, Inc., the maker ... data center assets and audio-video devices has recently updated its Visio Stencils library ... free and download shapes and stencils from http://www.VisioStencils.com. , New devices ...
(Date:3/29/2017)... ... 2017 , ... An inventor from Raynham, Mass., knows the ... conjunction with my braces always rubbed against the inside of my cheeks, causing ... problem." The O.B.S. was the result of his brainstorming. , This patent-pending invention ...
(Date:3/29/2017)... Ca (PRWEB) , ... March 29, 2017 , ... ... process in many scientific laboratories. The assembly protocols involve many repetitive steps and ... suited for automation, which enables the high-throughput needed, and results in a lower ...
Breaking Medicine News(10 mins):
(Date:3/29/2017)...  Glenmark Pharmaceuticals, a global pharmaceutical company, today ... fixed-dose combination of mometasone furoate (25 mcg) and ... nasal spray being studied for the treatment of ... recently completed Phase 3 trial assessing the efficacy ... mometasone, olopatadine or placebo. "We continue ...
(Date:3/29/2017)... New York , March 29, 2017 /PRNewswire/ ... recently published a report, which provides an exhaustive ... to the study, nearly 242 companies are functional ... fragmented and competitive. With the leading companies, such ... Purdue Pharma LP, focusing aggressively on various marketing ...
(Date:3/29/2017)... Research and Markets has announced the addition of the "Global ... ... market to grow at a CAGR of 2.87% during the period ... has been prepared based on an in-depth market analysis with inputs ... growth prospects over the coming years. The report also includes a ...
Breaking Medicine Technology: