Lysis from without
Abstract
In this commentary I consider use of the term “lysis from without” (LO) along with the phenomenon's biological relevance. LO originally described an early bacterial lysis induced by high-multiplicity virion adsorption and that occurs without phage production (here indicated as LOV). Notably, this is more than just high phage multiplicities of adsorption leading to bacterial killing. The action on bacteria of exogenously supplied phage lysin, too, has been described as a form of LO (here, LOL). LOV has been somewhat worked out mechanistically for T4 phages, has been used to elucidate various phage-associated phenomena including discovery of the phage eclipse, may be relevant to phage ecology, and, with resistance to LO (LOR), is blocked by certain phage gene products. Speculation as to the impact of LOV on phage therapy also is fairly common. Since LOV assays are relatively easily performed and not all phages are able to induce LOV, a phage's potential to lyse bacteria without first infecting should be subject to at least in vitro experimental confirmation before the LOV label is applied. The term “abortive infection” may be used more generally to describe non-productive phage infections that kill bacteria.
Acknowledgments
Thank you to Bob Blasdel and Cameron Thomas-Abedon along with three anonymous reviewers for their help in refining the manuscript.
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