Bacteriophage therapy: a novel method of lytic phage delivery

dc.contributor.advisor Donald L. Reynolds
dc.contributor.advisor Gregory J. Phillips
dc.contributor.author Platt, Ratree
dc.contributor.department Veterinary Microbiology and Preventive Medicine
dc.date 2018-08-22T23:55:47.000
dc.date.accessioned 2020-06-30T07:32:35Z
dc.date.available 2020-06-30T07:32:35Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2000
dc.date.issued 2000-01-01
dc.description.abstract <p>The widespread emergence of multi-antibiotic resistant bacteria has increased the need for alternatives to conventional antibiotic therapy. Accordingly, a significant amount of effort has been made to investigate the potential use of bacteriophages as prophylactic and therapeutic agents for bacterial infections. In this study, molecular biological techniques were applied to construct a lysogen of lytic bacteriophage lambda in an attempt to combat with multi-antibiotic resistant bacteria by a novel method of lytic phage delivery;To accomplish this goal, two plasmid-based site-specific recombination (SSR) systems for integration and recovery of DNA constructs from Escherichia coli and Salmonella typhimurium chromosomes were developed. The two systems are mediated by SSR machineries of bacteriophages lambda of E. coli and P22 of S. typhimurium. These systems utilize plasmid vectors with conditional replicating origin of replication and provide stable chromosomal integration of genes at specific bacteriophage attachment sites without disruption of any host gene or a need for antibiotic selection. E. coli contains attachment sites for both bacteriophages. When the two systems are applied consecutively, two different genes can be integrated at two specific locations. The integrated plasmids of both systems can also be completely excised and recovered from the host chromosomes to observe any genetic changes, e.g. by DNA sequencing. Both systems are also very applicable in construction of bacterial strains as well as live E. coli and S. typhimurium recombinant vaccines expressing foreign genes of interest;To construct a lysogen of lytic bacteriophage lambda, both SSR systems were applied. A lytic mutant (cI-) of bacteriophage lambda was marked with an antibiotic resistant gene cassette to facilitate a lysogen selection. The P22 SSR system helped integrate functional lambda repressor gene (cI) into a non-pathogenic E. coli strain and the marked lytic lambda phage lysogenized in the presence of the helper plasmid of the lambda SSR system. The lysogen demonstrated its efficacy in decreasing number of lambda sensitive E. coli. This lytic phage lysogen construction strategy can be applied for other bacteriophages. A pool of different lysogens infects a wider range of bacteria and could be utilized as alternatives to the use of antibiotics to control bacterial infections.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/13922/
dc.identifier.articleid 14921
dc.identifier.contextkey 6950770
dc.identifier.doi https://doi.org/10.31274/rtd-180813-15276
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/13922
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/67449
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/13922/r_9962838.pdf|||Fri Jan 14 20:04:16 UTC 2022
dc.subject.disciplines Microbiology
dc.subject.disciplines Molecular Biology
dc.subject.keywords Veterinary microbiology and preventive medicine
dc.subject.keywords Veterinary microbiology
dc.title Bacteriophage therapy: a novel method of lytic phage delivery
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 16f8e472-b1cd-4d8f-b016-09e96dbc4d83
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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