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Characterization of the Prophage Repertoire of African Salmonella Typhimurium ST313 Reveals High Levels of Spontaneous Induction of Novel Phage BTP1
Univ Liverpool, Inst Integrat Biol, Liverpool, Merseyside, England..
Univ Liverpool, Inst Integrat Biol, Liverpool, Merseyside, England..
Univ Liverpool, Inst Integrat Biol, Liverpool, Merseyside, England..
Katholieke Univ Leuven, Fac Biosci Engn, Food Microbiol Lab, Dept Microbial & Mol Syst, Leuven, Belgium..
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2017 (English)In: Frontiers in Microbiology, ISSN 1664-302X, E-ISSN 1664-302X, Vol. 8, article id 235Article in journal (Refereed) Published
Abstract [en]

In the past 30 years, Salmonella bloodstream infections have become a significant health problem in sub-Saharan Africa and are responsible for the deaths of an estimated 390,000 people each year. The disease is predominantly caused by a recently described sequence type of Salmonella Typhimurium: ST313, which has a distinctive set of prophage sequences. We have thoroughly characterized the ST313-associated prophages both genetically and experimentally. ST313 representative strain D23580 contains five full-length prophages: BTP1, Gifsy-2D23580, ST64BD23580, Gifsy-1D23580, and BTP5. We show that common S. Typhimurium prophages Gifsy-2, Gifsy-1, and ST64B are inactivated in ST313 by mutations. Prophage BTP1 was found to be a functional novel phage, and the first isolate of the proposed new species "Salmonella virus BTP1", belonging to the P22virus genus. Surprisingly, similar to 10(9) BTP1 virus particles per ml were detected in the supernatant of non-induced, stationary-phase cultures of strain D23580, representing the highest spontaneously induced phage titer so far reported for a bacterial prophage. High spontaneous induction is shown to be an intrinsic property of prophage BTP1, and indicates the phage-mediated lysis of around 0.2% of the lysogenic population. The fact that BTP1 is highly conserved in ST313 poses interesting questions about the potential fitness costs and benefits of novel prophages in epidemic S. Typhimurium ST313.

Place, publisher, year, edition, pages
2017. Vol. 8, article id 235
Keywords [en]
Gifsy, ST64B, BTP5, P22, polylysogeny, D23580
National Category
Microbiology in the medical area
Identifiers
URN: urn:nbn:se:uu:diva-318955DOI: 10.3389/fmicb.2017.00235ISI: 000394737400001PubMedID: 28280485OAI: oai:DiVA.org:uu-318955DiVA, id: diva2:1086637
Funder
Wellcome trust, 106914/Z/15/ZWenner-Gren FoundationsAvailable from: 2017-04-03 Created: 2017-04-03 Last updated: 2018-01-13Bibliographically approved

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