Pathogenicity and Virulence of Saccharomyces cerevisiae

Saccharomyces cerevisiae, widely known as baker’s or brewer’s yeast and valued for its industrial roles, has emerged as an opportunistic pathogen capable of causing invasive infections in immunocompromised individuals. Pathogenicity reflects a dynamic interaction between host susceptibility—such as weakened immunity or disrupted mucosal barriers—and fungal attributes including thermotolerance, oxidative stress resistance, biofilm formation and cell‐wall remodelling. Comparative analyses of clinical and environmental isolates reveal distinct genomic lineages and phenotypic traits linked to adhesion, pseudohyphal growth and immune evasion. Key virulence mechanisms include survival in human blood through enhanced antioxidant responses, penetration of epithelial barriers via filamentous growth forms and modulation of host innate defences by altering cell‐surface structures. The identification of infective strains originating from food products, dietary supplements and probiotic formulations has raised concerns about food‐borne transmission and highlights the importance of monitoring industrial yeast stocks. Understanding the genetic and molecular drivers of S. cerevisiae virulence is critical for risk assessment, the development of targeted antifungal strategies and the management of infections in vulnerable patient populations worldwide.

Research from Nature Portfolio

Recent studies have employed comparative genomics to trace the origins of clinical S. cerevisiae isolates to food environments, including bread and probiotic supplements. Phylogenetic clustering with industrial lineages highlights the food‐borne roots of opportunistic strains, while genome‐wide scans have uncovered structural variations and sequence polymorphisms associated with increased thermotolerance, adhesion and stress tolerance. These host‐adaptive genomic signatures serve as markers for surveillance and risk assessment of yeast used in food and supplement production.

Pathogenicity and Virulence of Saccharomyces cerevisiae publication trend

The graph below shows the total number of articles in pathogenicity and virulence of saccharomyces cerevisiae across all publications each year (not limited to Nature Index journals).

Technical terms

Opportunistic pathogen: An organism that causes disease primarily in hosts with compromised immune systems.

Pleiotropy: A single gene affecting multiple phenotypic traits, which can have contrasting effects in different environments.

Quantitative trait locus (QTL): A genomic region containing alleles that contribute to variation in a quantitative phenotype, such as virulence.

Pseudohyphal growth: A multicellular filamentous form adopted by yeast under nutrient limitation, associated with invasive behaviour.

Phylogenetic analysis: The study of evolutionary relationships among strains or species using genetic sequence data.

References

1. Comparative genomics of infective Saccharomycescerevisiae strains reveals their food origin. Scientific Reports (2023).
2. Opportunistic Strains of Saccharomyces cerevisiae: A Potential Risk Sold in Food Products. Frontiers in Microbiology (2016).
3. Genome-Wide Screen for Saccharomyces cerevisiae Genes Contributing to Opportunistic Pathogenicity in an Invertebrate Model Host. G3: Genes, Genomes, Genetics (2018).
4. Pathogenic Potential of Saccharomyces Strains Isolated from Dietary Supplements. PLOS ONE (2014).
5. Transcriptomics in human blood incubation reveals the importance of oxidative stress response in Saccharomyces cerevisiae clinical strains. BMC Genomics (2012).
6. Complex genetics cause and constrain fungal persistence in different parts of the mammalian body. Genetics (2022).