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New LLNL detection technology identifies bacteria, viruses, other organisms within 24 hours
Date:5/5/2010

from thousands of fungi and about 202,000 protozoa sequences from 75 protozoa.

As a screening tool, Slezak sees the LLMDA as occupying niche roles between PCR machines and sequencing.

The LLMDA process starts with the purification of DNA or RNA from a sample, such as sputum or blood. The sample is next labeled with a fluorescent dye and hybridized on the microarray at 42 degrees C or about 107.6 degrees Fahrenheit. In turn, a fluorescent scanner and analysis software are used to detect the probes that have lit up, identifying the presence of viral or bacterial sequences.

The Livermore team plans to update probes on the array with new sequences of bacteria, viruses and other microorganisms from GenBank and other public databases about once per year, in addition to using sequences obtained from collaborators for their probes.

LLNL's current collaborators include the University of California, San Francisco; the Blood Systems Research Institute; the University of Texas Medical Branch (Galveston); the National Institute for Public Health and the Environment of Bilthoven, the Netherlands; the Statens Serum Institut of Copenhagen, Denmark; the University of California, Davis; Imigene; the U.S. Food & Drug Administration; and the Marine Mammal Center of Sausalito, Calif.

A computer scientist and the team's leader, Slezak came up with the idea for the LLMDA in 2003. His team includes biologist Crystal Jaing, who leads the microarray lab work and manages the collaborations; bioinformaticist Shea Gardner, who designed the array; biostatistician Kevin McLoughlin, who designed the analysis software; and James B. Thissen, who performs the microarray experiments.


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Contact: Steve Wampler
wamperl1@llnl.gov
925-423-3107
DOE/Lawrence Livermore National Laboratory
Source:Eurekalert

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