Genomic and Probiotic Characterization of Weissella Species

Weissella species comprise a diverse group of Gram-positive lactic acid bacteria noted for their obligately heterofermentative metabolism, ecological versatility and emerging roles as both probiotics and occasional opportunistic pathogens. Advances in whole-genome sequencing and comparative genomics have revealed a flexible pangenome marked by strain-specific clusters encoding carbohydrate-active enzymes, exopolysaccharide biosynthesis pathways and bacteriocin loci. Genomic analyses have elucidated safety attributes—absence of mobile antibiotic resistance cassettes in many strains—and flagged the occasional presence of virulence determinants such as haemolysins and collagen adhesins in isolates linked to human infections. Simultaneously, functional genomics and in vitro assays have characterised key probiotic traits, including acid and bile tolerance, tight-junction modulation, antimicrobial metabolite production and immunomodulatory capacity. Specific species such as W. cibaria and W. confusa exhibit robust adhesion to intestinal epithelia, attenuation of pro-inflammatory cytokine expression and enhancement of barrier integrity via modulation of the NF-κB signalling cascade. These characteristics underpin applications in gut health, oral care and fermentation of functional foods. Ongoing genome mining efforts continue to uncover novel carbohydrate utilisation operons and secondary metabolite gene clusters, broadening the biotechnological potential of Weissella as starter cultures and next-generation probiotics. At the same time, strain-level safety assessments remain essential to mitigate risks of opportunistic infection, particularly in immunocompromised hosts. Overall, the integration of genomic insight with probiotic evaluation is driving the rational selection and development of Weissella strains for clinical, industrial and nutritional applications on a global scale.

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Genomic and Probiotic Characterization of Weissella Species publication trend

The graph below shows the total number of articles in genomic and probiotic characterization of weissella species across all publications each year (not limited to Nature Index journals).

Technical terms

Obligately heterofermentative: Metabolism producing lactate, CO₂ and acetate or ethanol from carbohydrates.

Pangenome: The full complement of genes within a species, including core and accessory genomes.

Bacteriocin: Ribosomally synthesised antimicrobial peptide targeting competing bacteria.

Exopolysaccharide (EPS): High-molecular-weight sugar polymer secreted by bacteria, often conferring biofilm and texturising properties.

Tight junction proteins: Transmembrane proteins (e.g., claudin, occludin) forming seals between epithelial cells to regulate permeability.

References

1. Weissella cibaria Relieves Gut Inflammation Caused by Escherichia coli through Inflammation Modulation and Gut Microbiota Regulation. Foods (2024).
2. The Weissella and Periweissella genera: up-to-date taxonomy, ecology, safety, biotechnological, and probiotic potential. Frontiers in Microbiology (2023).
3. Motility in Periweissella Species: Genomic and Phenotypic Characterization and Update on Motility in Lactobacillaceae. Microorganisms (2023).