Microbial Dynamics in Cheese Fermentation

Cheese fermentation is a complex bioprocess driven by diverse microbial consortia that transform milk into a wide array of textures, flavours and aromas. Initial acidification is typically orchestrated by starter cultures, predominantly lactic acid bacteria, which convert lactose into lactic acid and set the stage for curd formation. As ripening progresses, non-starter lactic acid bacteria, yeasts and moulds colonise the cheese matrix, engaging in proteolysis, lipolysis and the production of volatile compounds that define regional and varietal character. Microbial succession is influenced by factors such as milk provenance, processing conditions, salt content, temperature and humidity. Modern omics approaches—metagenomics, metatranscriptomics and metabolomics—have unveiled the genetic potential and functional activity of cheese microbiomes, shedding light on inter-species interactions, horizontal gene transfer and the emergence or attenuation of antimicrobial-resistance determinants. Understanding these dynamics is essential for ensuring safety, authenticity and consistent quality, while offering new routes to tailor sensory outcomes, accelerate maturation and develop bioprotective strategies.

Research from Nature Portfolio

Recent metatranscriptomic analyses of a traditional Italian cheese ripening process demonstrated that modest increases in maturation temperature selectively up-regulate genes associated with proteolysis, lipolysis and amino acid catabolism, markedly accelerating biochemical transformations and volatile compound formation. A comprehensive year-long survey of raw bovine milk microbiota revealed pronounced seasonal shifts in community composition, with temperature and humidity driving the balance of Firmicutes, Proteobacteria and Actinobacteria and influencing downstream fermentative consistency. Together, these seminal studies illustrate how environmental and processing parameters can be harnessed to modulate community activity and product maturation.

Research from all publishers

A longitudinal metagenomic and resistome study of artisanal blue-veined cheeses uncovered that cave environments introduce non-starter taxa such as Tetragenococcus spp., which displace raw-milk bacteria during ripening and engage in horizontal gene transfer with starter strains, resulting in a net decrease of antimicrobial-resistance genes. A broad survey of 73 European cheese-making facilities reconstructed over 6,100 metagenome-assembled genomes, identifying novel lactic acid bacteria species linked to flavour development, probiotic potential and bioprotective activity, while revealing facility-specific microbial signatures relevant to traceability and hygiene. Reviews on Pseudomonas in milk and dairy products have detailed the diverse suite of secondary metabolites produced by this genus—ranging from lipopeptides to quorum-sensing signals—highlighting both spoilage risks and opportunities for exploiting bioactive compounds in biocontrol applications.

Microbial Dynamics in Cheese Fermentation publication trend

The graph below shows the total number of articles in microbial dynamics in cheese fermentation across all publications each year (not limited to Nature Index journals).

Technical terms

Microbiome: the community of microorganisms and their collective genetic material within the cheese environment.

Starter culture: selected microbial strains introduced to initiate controlled fermentation.

Non-starter lactic acid bacteria (NSLAB): bacteria that colonise cheese during ripening but are not part of the initial starter mix.

Metagenome-assembled genome (MAG): a genome reconstructed from mixed-community sequencing data, representing an individual microbial species.

Resistome: the full complement of antimicrobial-resistance genes present in a microbial community.

Metatranscriptomics: the study of all RNA transcripts in a community to assess active gene expression profiles.

References

1. The detailed analysis of the microbiome and resistome of artisanal blue-veined cheeses provides evidence on sources and patterns of succession linked with quality and safety traits. Microbiome (2024).
2. Microbial dynamics and Pseudomonas natural product production in milk and dairy products. Natural Product Reports (2025).
3. Microbiome mapping in dairy industry reveals new species and genes for probiotic and bioprotective activities. npj Biofilms and Microbiomes (2024).
4. Metatranscriptomics reveals temperature-driven functional changes in microbiome impacting cheese maturation rate. Scientific Reports (2016).
5. Variation in Raw Milk Microbiota Throughout 12 Months and the Impact of Weather Conditions. Scientific Reports (2018).