Genomic insights and probiotic characteristics of Bifidobacterium gallinarum CACC 514 isolated from canine

Abstract

Background: The genus Bifidobacterium includes common healthy gut microbes in mammals and is widely acknowledged as a probiotics with health-promoting properties. Results: Bifidobacterium gallinarum CACC 514 was isolated from canine feces and its potential probiotic properties were characterized by comparative and functional genome analyses.The complete genome of strain CACC 514 was found to be 2.4 Mb, with a G + C content of 63.9 mol%. The strain possessed factors beneficial to mammalian health based on the presence of genes related to mucosal surface adhesion proteins, stress-related genes, and extracellular polysaccharide genes. A comparative genome analysis with other Bifidobacterium species revealed the unique characteristics of this species. These functional genomics have been confirmed for its superiority by probiotic properties, acid and bile tolerance, and adhesion to mucus. Conclusions: The genome analysis and in vitro probiotics characteristics revealed its superiority in the intestine. These results add to our comprehensive understanding of B. gallinarum and suggest that this strain has potential application in mammalian probiotics. Keywords: Bifidobacterium gallinarum, gut microbe, probiotics, genome analysis, canine, feces.