Microbial Frontiers in Extreme Environments: Rethinking Bioactive Potential Across Marine and Pristine Ecosystems

Costanza Ragozzino; Vincenza Casella; Daniela Coppola; Laura Vitale

doi:10.25163/microbbioacts.9110639

Microbial Bioactives

Microbial Bioactives | Online ISSN 2209-2161

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Volume 9 Number 1 2026

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Microbial Frontiers in Extreme Environments: Rethinking Bioactive Potential Across Marine and Pristine Ecosystems

Abstract 1. Introduction 2. Materials and Methods 3. Results 4. Discussion 5. Limitations 6. Conclusion References

Costanza Ragozzino¹*, Vincenza Casella ^1,2, Daniela Coppola ¹, Laura Vitale ²

+ Author Affiliations

Microbial Bioactives 9 (1) 1-8 https://doi.org/10.25163/microbbioacts.9110639

Submitted: 02 April 2026 Revised: 21 May 2026 Accepted: 01 June 2026 Published: 03 June 2026

Abstract

Marine and pristine microbial ecosystems are often described as vast reservoirs of untapped biochemical diversity—but perhaps that description still understates their complexity. These environments, ranging from deep-sea trenches to glacial ice and isolated cave systems, impose constraints that seem, at first glance, incompatible with life. Yet it is precisely within these constraints that microorganisms appear to innovate most profoundly. This review attempts to bring together what is currently known—though not always consistently—about microbial diversity, biosynthetic potential, and bioactive compound production across such extreme habitats. Rather than focusing on isolated discoveries, the discussion moves across ecological gradients, linking environmental pressures with metabolic adaptation. Evidence suggests that marine systems tend to support broader biosynthetic capacity, while cryospheric and cave environments, although less diverse, often yield more specialized and structurally distinct metabolites. Particular attention is given to compounds such as kaempferol and complex polyketides, alongside the growing role of metagenomics in uncovering previously hidden biosynthetic gene clusters. At the same time, methodological limitations—especially the gap between genomic prediction and functional expression—remain difficult to ignore. Taken together, the literature points toward a field that is expanding rapidly, yet still uneven in its interpretive clarity. A more integrative approach—one that balances ecology, genomics, and chemistry—may be necessary to fully realize the biotechnological promise embedded within these microbial systems.

Keywords: Marine microbiome, Pristine habitats, Bioactive compounds, Metagenomics, Secondary metabolites, Extremophiles, Sustainable biotechnology

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Microbial Frontiers in Extreme Environments: Rethinking Bioactive Potential Across Marine and Pristine Ecosystems

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