What it is
The authors present HIDEN-SEQ (hidden Acr-enabled transposon-insertion sequencing), a transposon-insertion sequencing method for phages that systematically links viral genes to selectable phenotypes. In the model phage T4 it reproduces the gene essentiality map established over decades of research, and it ports readily to diverse non-model phages, revealing conditionally essential genes across bacterial hosts and growth conditions, including previously unknown antidefence factors that the authors matched to specific antiviral defences.
Why it matters
Phages are fierce bacterial predators with great clinical potential against multidrug-resistant pathogens, but the large number of genes of unknown function in phage genomes is a major obstacle to understanding phage-host interactions at the molecular level. A method that systematically links phage genes to selectable phenotypes, and ports readily to non-model phages, is a way into those unknown genes; the authors anticipate it will be used to reveal their functions.
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Filed underBacteriophages and microbial interactions, Monoclonal and Polyclonal Antibodies Research, Cancer Research and Treatments