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Bacteriophages isolated from Lake Michigan demonstrate broad host-range across several bacterial phyla
Virology Journal
  • Kema Malki, Loyola University Chicago
  • Alex Kula, Loyola University Chicago
  • Katherine Bruder, Loyola University Chicago
  • Emily Sible, Loyola University Chicago
  • Thomas Hatzopoulos, Loyola University Chicago
  • Stephanie Steidel, Loyola University Chicago
  • Siobhan C Watkins, Loyola University Chicago
  • Catherine Putonti, Loyola University Chicago
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BACKGROUND: The study of bacteriophages continues to generate key information about microbial interactions in the environment. Many phenotypic characteristics of bacteriophages cannot be examined by sequencing alone, further highlighting the necessity for isolation and examination of phages from environmental samples. While much of our current knowledge base has been generated by the study of marine phages, freshwater viruses are understudied in comparison. Our group has previously conducted metagenomics-based studies samples collected from Lake Michigan - the data presented in this study relate to four phages that were extracted from the same samples. FINDINGS: Four phages were extracted from Lake Michigan on the same bacterial host, exhibiting similar morphological characteristics as shown under transmission electron microscopy. Growth characteristics of the phages were unique to each isolate. Each phage demonstrated a host-range spanning several phyla of bacteria - to date, such a broad host-range is yet to be reported. Genomic data reveals genomes of a similar size, and close similarities between the Lake Michigan phages and the Pseudomonas phage PB1, however, the majority of annotated genes present were ORFans and little insight was offered into mechanisms for host-range. CONCLUSIONS: The phages isolated from Lake Michigan are capable of infecting several bacterial phyla, and demonstrate varied phenotypic characteristics despite similarities in host preference, and at the genomic level. We propose that such a broad host-range is likely related to the oligotrophic nature of Lake Michigan, and the competitive benefit that this characteristic may lend to phages in nature.

Author Posting. © 2015 Malki et al. This article is posted here by permission of the authors for personal use, not for redistribution. The article was published in Virology Journal Volume 12, Issue 164,

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Malki, K, A Kula, K Bruder, E Sible, T Hatzopoulos, S Steidel, SC Watkins, and C Putonti. "Bacteriophages isolated from Lake Michigan demonstrate broad host-range across several bacterial phyla." Virology Journal 12(164), 2015.