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Title: Deep ocean metagenomes provide insight into the metabolic architecture of bathypelagic microbial communities
Authors: Acinas, Silvia G.
Sánchez, Pablo
Salazar, Guillem
Cornejo-Castillo, Francisco M.
Sebastián Caumel, Marta 
Logares, Ramiro
Royo-Llonch, Marta
Paoli, Lucas
Sunagawa, Shinichi
Hingamp, Pascal
Ogata, Hiroyuki
Lima-Mendez, Gipsi
Roux, Simon
González, José M.
Arrieta, Jesús M.
Alam, Intikhab S.
Kamau, Allan
Bowler, Chris
Raes, Jeroen
Pesant, Stéphane
Bork, Peer
Agustí, Susana
Gojobori, Takashi
Vaqué, Dolors
Sullivan, Matthew B.
Pedrós-Alió, Carlos
Massana, Ramon
Duarte, Carlos M.
Gasol, Josep M.
UNESCO Clasification: 2510 Oceanografía
Keywords: Environmental microbiology
Microbial biooceanography
Microbial ecology
Issue Date: 2021
Project: Expedición de circunnavegación MALASPINA 2010: Cambio global y exploración del océano global 
Journal: Communications Biology 
Abstract: The deep sea, the largest ocean’s compartment, drives planetary-scale biogeochemical cycling. Yet, the functional exploration of its microbial communities lags far behind other environments. Here we analyze 58 metagenomes from tropical and subtropical deep oceans to generate the Malaspina Gene Database. Free-living or particle-attached lifestyles drive functional differences in bathypelagic prokaryotic communities, regardless of their biogeography. Ammonia and CO oxidation pathways are enriched in the free-living microbial communities and dissimilatory nitrate reduction to ammonium and H2 oxidation pathways in the particle-attached, while the Calvin Benson-Bassham cycle is the most prevalent inorganic carbon fixation pathway in both size fractions. Reconstruction of the Malaspina Deep Metagenome-Assembled Genomes reveals unique non-cyanobacterial diazotrophic bacteria and chemolithoautotrophic prokaryotes. The widespread potential to grow both autotrophically and heterotrophically suggests that mixotrophy is an ecologically relevant trait in the deep ocean. These results expand our understanding of the functional microbial structure and metabolic capabilities of the largest Earth aquatic ecosystem.
ISSN: 2399-3642
DOI: 10.1038/s42003-021-02112-2
Source: Communications Biology [EISSN 2399-3642], v. 4 (1), 604, (Diciembre 2021)
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