Bacteriophages are abundant components of vertebrate gut microbial communities, impacting bacteriome dynamics, evolution, and directly interacting with the superhost. However, knowledge about gut phageomes and their interaction with bacteriomes in vertebrates under natural conditions is limited to humans and non-human primates. Widely used specific-pathogen-free (SPF) mouse models of host-microbiota interactions have altered gut bacteriomes compared to wild mice, and data on phageomes from wild or other non-SPF mice are lacking. We demonstrate divergent gut phageomes and bacteriomes in wild and captive non-SPF mice, with wild mice phageomes exhibiting higher alpha-diversity and interindividual variability. In both groups, phageome and bacteriome structuring mirrored each other, correlating at the individual level. Re-analysis of previous data from phageomes of SPF mice revealed their enrichment in Suoliviridae crAss-like phages compared to our non-SPF mice. Disrupted bacteriomes in mouse models can be treated by transplanting healthy phageomes, but the effects of phageome transplants on healthy adult gut microbiota are still unknown. We show that experimental transplantation of phageomes from wild to captive mice did not cause major shifts in recipient phageomes. However, the convergence of recipient-to-donor phageomes confirmed that wild phages can integrate into recipient communities. The differences in the subset of integrated phages between the two recipient mouse strains illustrate the context-dependent effects of phage transplantation. The transplantation did not impact recipient gut bacteriomes. This resilience of healthy adult gut microbiomes to the intervention has implications for phage allotransplantation safety.

Department of Zoology Faculty of Science Charles University Viničná 7 128 44 Prague Czech Republic

Institute of Vertebrate Biology of the Czech Academy of Sciences Květná 8 603 00 Brno Czech Republic

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