This article details the isolation, engineering, and ecological study of temperate bacteriophages found within the human gut. The research characterized 134 inducible prophages from a collection of bacterial isolates, finding that only a fraction of computationally predicted prophages could be experimentally induced in pure cultures. Crucially, the study demonstrated that human host-associated cellular products, such as those from lysed colonic cells (Caco2), can act as prophage induction triggers, suggesting a link between gastrointestinal cell lysis and phage activation. Furthermore, the findings highlight that genetic factors, like mutations in excision genes, can trap prophages within host genomes, and that polylysogeny (multiple prophages) and integration sites influence induction dynamics. The authors emphasize the importance of culture-based techniques to validate computational predictions and advance the understanding of the human gut virome for future biotechnological applications.

References:

• Dahlman, S., Avellaneda-Franco, L., Rutten, E. L., Gulliver, E. L., Solari, S., Chonwerawong, M., ... & Barr, J. J. (2025). Isolation, engineering and ecology of temperate phages from the human gut. Nature, 1-8.