Defining the essential genome of diverse phages with phage Tn-seq.

Phage Tn-seq reveals essential genes and enables rapid engineering across diverse phages, including jumbo and hypermodified DNA types.

• Why it matters: Understanding phage biology and engineering capabilities is crucial for developing effective phage therapies and combating bacterial resistance.
• What they did: The study employed phage Tn-seq, a genome-wide mutational approach using Tn5 transposon mutagenesis, deep sequencing, and anti-CRISPR selection across various phages, including a jumbo phage.
• The result: This method identified core and structural genes, predicted transcriptional regions, and facilitated quick cargo delivery and double mutant creation, advancing phage research and therapeutic potential.