The article presents a comprehensive study on temperate bacteriophages (phages) residing within the human gut, focusing on their isolation, engineering, and ecological dynamics. Researchers characterized 134 inducible prophages from 252 human gut bacterial isolates, finding that only a small fraction of computationally predicted prophages could be induced in pure culture, highlighting the limitations of computational-only predictions. Key findings suggest that human host-associated cellular products, such as Caco2 cell lysates, may act as induction triggers, and that prophage inactivation can be linked to mutations in excision genes, providing a genetic pathway for prophage domestication. The study also revealed that polylysogeny (harboring multiple prophages) is common and correlates with increased inducibility, while divergent prophage integration sites can influence differential induction among similar host strains. Ultimately, the research emphasizes the necessity of culture-based techniques for fully understanding the complex biology and function of these viruses in the gut microbiome.

References:

• Dahlman S, Avellaneda-Franco L, Rutten E L, et al. Isolation, engineering and ecology of temperate phages from the human gut[J]. Nature, 2025: 1-8.