A Genomic Investigation into the Probiotic Attributes Among Members of the Lactobacillaceae family.

Lactobacillaceae species are known for their significant contribution to producing many fermented food products and are essential components of available probiotic formulations. In recent years, there has been a significant increase in the availability of microbial genomic data belonging to a wide range of organisms, including the members of the probiotic community. These publically available genome sequences of probiotic members can provide useful insights into the genetic basis of their complex nature. Towards this, a comprehensive whole genome analysis of 41 probiotic Lactobacillacea strains was performed to uncover the genetic elements responsible for their core probiotic traits. The 41 probiotic genomes were evaluated for biosafety, resilience to the harsh conditions of the human gut, potential host-microbial interactions, and beneficial functional features. Genomic evaluations suggest that the selected Lactobacillaceae strains pose minimal biosafety risks in harboring and transferring harmful genes. Computational functional characterization indicates that these strains possess robust metabolic and functional machinery capable of synthesizing and metabolizing various bioactive molecules, including amino acids, vitamins, neurotransmitters, short-chain fatty acids, antioxidants, and other beneficial secondary metabolites. Furthermore, the predicted host-microbe interactions show that these strains are potentially capable of modulating host physiological processes, particularly in immune response and signal transduction pathways. Pangenome-based diversity and association studies also revealed significant genetic differences between probiotic and non-probiotic organisms, possibly contributing to enhanced functional capabilities. The findings of this study underscore the potential of genomic approaches in characterizing and evaluating the diverse probiotic communities such as Lactobacillaceae, aiding future investigations into the mechanisms of their promising effects.