Ecological Genomics of Marine Cyanobacteria

Marine cyanobacteria, notably the picocyanobacterial genera Prochlorococcus and Synechococcus, are among the most abundant photosynthetic organisms on Earth and play a pivotal role in global biogeochemical cycles. Ecological genomics combines high-throughput sequencing, comparative genomics and environmental omics to uncover how genomic variation drives niche adaptation, community structure and ecosystem function. In oligotrophic regions of the ocean, cyanobacterial populations exhibit streamlined genomes, specialised metabolic pathways and finely tuned regulatory circuits that optimise nutrient acquisition, light harvesting and stress responses. Patterns of gene gain and loss, horizontal gene transfer and genomic island dynamics underpin rapid responses to fluctuations in nutrient availability, temperature and light quality. Integrating metagenomic surveys with single-cell genomics and transcriptomic profiling has revealed distinct ecotypes adapted to gradients of iron, phosphorus, nitrogen and salinity across coastal, estuarine and open-ocean realms. Proteomic and metabolomic analyses further elucidate how these microorganisms balance resource allocation under climate-driven shifts in ocean stratification and mixed-layer depth. Together, these approaches illuminate the evolutionary strategies that sustain primary production and carbon sequestration in marine ecosystems, offering insights into how cyanobacterial communities may respond to ongoing environmental change.

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Ecological Genomics of Marine Cyanobacteria publication trend

The graph below shows the total number of articles in ecological genomics of marine cyanobacteria across all publications each year (not limited to Nature Index journals).

Technical terms

Ecological genomics: The study of how genomic variation influences organism–environment interactions and ecosystem processes.

Metagenomics: The direct sequencing and analysis of genetic material recovered from environmental samples.

Transcriptomics: The comprehensive profiling of RNA transcripts expressed by an organism or community.

Proteomics: The large-scale characterisation of proteins expressed under specific conditions.

Oligotrophic: Describing environments with low concentrations of nutrients such as nitrogen or phosphorus.

Ecotype: A genetically distinct population adapted to a particular ecological niche.

References

1. Differential global distribution of marine picocyanobacteria gene clusters reveals distinct niche-related adaptive strategies. The ISME Journal: Multidisciplinary Journal of Microbial Ecology (2023).
2. A distinct, high-affinity, alkaline phosphatase facilitates occupation of P-depleted environments by marine picocyanobacteria. Proceedings of the National Academy of Sciences of the United States of America (2024).
3. Shotgun proteomics reveals temperature-dependent regulation of major nutrient metabolism in coastal Synechococcus sp. WH5701. Algal Research (2023).