Researchers rebuild a lost virus from its DNA sequence

A synthetic version of the bacteria-infecting phage PRR1 showed the biological and structural traits recorded for its historical form.

Editorial illustration — not from the study.

Physical collections of bacterial strains and related genetic elements can be lost over time, making older experiments difficult to reproduce. In this study, researchers used the digital sequence of PRR1 to reconstruct the phage, a virus that infects bacteria and depends on a plasmid in its host.

The team then examined the reconstructed particles genetically, biologically and with high-resolution microscopy. The abstract reports that the synthetic PRR1 showed biological and structural characteristics identical to those documented for the wild-type phage.

What was rebuilt

The researchers produced PRR1 de novo from its stored DNA sequence. PRR1 is a plasmid-dependent, single-stranded RNA bacteriophage—a virus that infects bacteria and relies on a plasmid in the bacterial host. Genetic, phenotypic, or observable biological, and ultrastructural tests found that the synthetic virions had the same biological and structural traits reported for the historical wild-type phage.

Why the reconstruction matters

The work shows that a bacteriophage no longer available in culture collections can be recreated from a digital sequence record. That gives researchers a way to recover some lost mobile genetic elements and revisit historical findings, while also making them available for evolutionary and antimicrobial research described in the study.

Evidence and caveats

The conclusion is based on genetic tests, biological or trait-based tests, and ultrastructural examination of the reconstructed phage. The abstract does not provide the individual test results, sample sizes, reconstruction procedures, or details of how closely the historical and synthetic traits were compared. It also describes PRR1 as having evidently been lost from many repositories, rather than documenting the status of every culture collection.

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