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Genomic Library Screening for Viruses from the Human Dental Plaque Revealed Pathogen-Specific Lytic Phage Sequences

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Abstract

Bacterial pathogenesis presents an astounding arsenal of virulence factors that allow them to conquer many different niches throughout the course of infection. Principally fascinating is the fact that some bacterial species are able to induce different diseases by expression of different combinations of virulence factors. Nevertheless, studies aiming at screening for the presence of bacteriophages in humans have been limited. Such screening procedures would eventually lead to identification of phage-encoded properties that impart increased bacterial fitness and/or virulence in a particular niche, and hence, would potentially be used to reverse the course of bacterial infections. As the human oral cavity represents a rich and dynamic ecosystem for several upper respiratory tract pathogens. However, little is known about virus diversity in human dental plaque which is an important reservoir. We applied the culture-independent approach to characterize virus diversity in human dental plaque making a library from a virus DNA fraction amplified using a multiple displacement method and sequenced 80 clones. The resulting sequence showed 44% significant identities to GenBank databases by TBLASTX analysis. TBLAST homology comparisons showed that 66% was viral; 18% eukarya; 10% bacterial; 6% mobile elements. These sequences were sorted into 6 contigs and 45 single sequences in which 4 contigs and a single sequence showed significant identity to a small region of a putative prophage in the Corynebacterium diphtheria genome. These findings interestingly highlight the uniqueness of over half of the sequences, whilst the dominance of a pathogen-specific prophage sequences imply their role in virulence.

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Acknowledgments

The author acknowledges Department of infection, immunity and inflammation, Leicester Medical School, University Leicester for allowing us to avail research facilities to conduct this study.

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Authors and Affiliations

  1. Department of Pharmaceutics, College of Pharmacy, Qassim University, Buraidah, Saudi Arabia

    Ahmed Nasser Al-Jarbou

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  1. Ahmed Nasser Al-Jarbou
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Correspondence to Ahmed Nasser Al-Jarbou.

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Al-Jarbou, A.N. Genomic Library Screening for Viruses from the Human Dental Plaque Revealed Pathogen-Specific Lytic Phage Sequences. Curr Microbiol 64, 1–6 (2012). https://doi.org/10.1007/s00284-011-0025-z

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  • DOI: https://doi.org/10.1007/s00284-011-0025-z

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