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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Microbiome
2025
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| Subjects: | |
| Online Access: | https://pubmed.ncbi.nlm.nih.gov/41388438/ |
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Table of Contents:
- Ecological success in freshwater lakes: insights from novel cultivated lineages of the abundant Nanopelagicales order. Chiriac, Maria-Cecilia Layoun, Paul Fernandes, Clafy Szőke-Nagy, Tiberiu Kasalicky, Vojtech Okazaki, Yusuke Woodhouse, Jason N Grossart, Hans-Peter Piwosz, Kasia Znachor, Petr Sonntag, Bettina Callieri, Cristiana Orlić, Sandi Sommaruga, Ruben Lepère, Cécile Biderre-Petit, Corinne Tammert, Helen Herlemann, Daniel P R Ślusarczyk, Mirosław Bednarska, Anna Banciu, Horia L Zalewski, Mariusz Woźniczka, Adam Ghai, Rohit Salcher, Michaela M Haber, Markus Lakes Phylogeny Genome, Bacterial RNA, Ribosomal, 16S Metagenome The order Nanopelagicales is the most abundant bacterioplankton lineage in freshwater lakes and exhibits typical streamlined genomic characteristics such as small cell volumes ( Here, we report the isolation and genome analysis of 72 new Nanopelagicales strains, including members of Planktophila and a novel, previously uncultured genus, Aquilimus. High interspecific diversity and microdiversity were observed in the genus Planktophila, which likely facilitates the coexistence of closely related species within the same habitats by allowing fine-scale niche partitioning. The unusually high diversity of transporters for small organic compounds, along with carbohydrate-active enzymes, suggests that Planktophila members can degrade plant and algal polymers and import the resulting products to support growth. A notable finding is the repeated, independent loss of the oxidative phase of the pentose phosphate pathway in abundant Nanopelagicales species, which may represent an energy-saving adaptation in oligotrophic waters. Two species (Planktophila vernalis and Nanopelagicus abundans) seem to be equally abundant on a global scale, with water pH likely being the most significant factor influencing the predominance of one group over the other in different water bodies. Additionally, P. vernalis may tolerate periods of anoxia due to genomic encoding of respiratory nitrate reductase and nitrate/nitrite antiporters. In conclusion, this work increased to a great degree the cultivated diversity of the abundant Nanopelagicales order. Analysis of over 1700 metagenomes showed that only a few cultivated species are globally dominant, and time-series analyses revealed consistent spring and autumn peaks. Key metabolic adaptations, such as loss of the oxidative phase of the pentose phosphate pathway and a high microdiversity of genes involved in cell surface biosynthesis and modifications, are likely to help these species survive periods of starvation and avoid predation. These findings highlight the ecological importance of Nanopelagicales and suggest that microdiversity underpins their adaptability. This work lays a foundation for studying their physiology, ecology, and strain-specific functional variation. Video Abstract.