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Venter Institute-Led Team Recovers and Sequences Genome of Periodontal Pathogen from Biofilm in Hospital Sink using Single-Cell Genomics
Date:4/5/2013

LA JOLLA, Calif., April 5, 2013 /PRNewswire-USNewswire/ -- A team of researchers led by scientists from the J. Craig Venter Institute (JCVI) has published a study outlining the recovery and genomic analysis, using single-cell genomic techniques, of a periodontal pathogen, Porphyromonas gingivalis, from a hospital sink. This is the first time that a single-cell genome sequencing approach was used to isolate and analyze a single microbe from a biofilm in a healthcare setting. The team, led by JCVI's Jeffrey McLean published their study in the April 5 edition of the journal Genome Research.

Understanding the community of microbes living in biofilms, especially those in healthcare settings, has been limited partially because pathogens can be in very low numbers and many other bacterial types are not easily cultured.  A method for DNA sequencing from single cells developed by JCVI's Roger Lasken group, is now allowing researchers to sequence the vast numbers of uncultured microbes in the environment. With this approach this team hopes to sequence many hospital pathogens that have been otherwise inaccessible. 

In this study the team targeted bacterial cells in a biofilm sampled from a hospital bathroom sink. Using single-cell genomic sequencing combined with a new single-cell genome assembler, SPAdes, developed by Pavel Pevzner , University of California, San Diego, the team found 25 different types of bacteria within the biofilm. The bacteria represented environmental species, human commensals and human pathogens.

The team then reconstructed a near complete genome of one specific periodontal pathogen, P. gingivalis (designated as JCVI SC001) from a single cell. While this globally important pathogen is well known, only three other P. gingivalis genomes have been sequenced to date, and a
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SOURCE J. Craig Venter Institute
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