Niche-directed evolution modulates genome architecture in freshwater Planctomycetes

0504973 - BC 2020 RIV GB eng J - Journal Article
Andrei, Adrian-Stefan - Salcher, Michaela M. - Mehrshad, Maliheh - Rychtecký, Pavel - Znachor, Petr - Ghai, Rohit
Niche-directed evolution modulates genome architecture in freshwater Planctomycetes.
The ISME Journal. Roč. 13, č. 4 (2019), s. 1056-1071. ISSN 1751-7362. E-ISSN 1751-7370
R&D Projects: GA ČR(CZ) GA17-04828S
Grant - others:AV ČR(CZ) MSM200961801; AV ČR(CZ) L200961651
Program: Program na podporu mezinárodní spolupráce začínajících výzkumných pracovníků; Program podpory perspektivních lidských zdrojů
Institutional support: RVO:60077344
Keywords : multiple sequence alignment * bacterioplankton community * oxygenated hypolimnion
OECD category: Microbiology
Impact factor: 9.180, year: 2019
Method of publishing: Open access
https://www.nature.com/articles/s41396-018-0332-5.pdf

Freshwater environments teem with microbes that do not have counterparts in culture collections or genetic data available in genomic repositories. Currently, our apprehension of evolutionary ecology of freshwater bacteria is hampered by the difficulty to establish organism models for the most representative clades. To circumvent the bottlenecks inherent to the cultivation-based techniques, we applied ecogenomics approaches in order to unravel the evolutionary history and the processes that drive genome architecture in hallmark freshwater lineages from the phylum Planctomycetes. The evolutionary history inferences showed that sediment/soil Planctomycetes transitioned to aquatic environments, where they gave rise to new freshwater-specific clades. The most abundant lineage was found to have the most specialised lifestyle (increased regulatory genetic circuits, metabolism tuned for mineralization of proteinaceous sinking aggregates, psychrotrophic behaviour) within the analysed clades and to harbour the smallest freshwater Planctomycetes genomes, highlighting a genomic architecture shaped by niche-directed evolution (through loss of functions and pathways not needed in the newly acquired freshwater niche).
Permanent Link: http://hdl.handle.net/11104/0297231