Functional Metagenomics Reveals Gut Microbial Biosynthetic Potential for Essential Nutrients in Juvenile Chum Salmon.

Gut microbiome of juvenile chum salmon encodes complete biosynthetic pathways for essential amino acids and B-vitamins absent in the host genome, with 1532 KEGG Orthology identifiers mapped.

• Why it matters: Understanding how gut microbes supplement host nutrition addresses gaps in knowledge about host-microbiome metabolic interactions during early development, which is crucial for fish health and aquaculture.
• What they did: Researchers used shotgun metagenomic sequencing combined with KEGG module completion analysis on juvenile chum salmon at 35 days posthatching, optimizing protocols to increase microbial DNA detection from 11.3% to 41.2%.
• The result: The gut microbiome encodes biosynthetic potential for nutrients the host genome lacks, mainly contributed by Bartonella-like, Acinetobacter, and Enterococcus lineages, suggesting potential nutritional benefits pending experimental validation.