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Partitioning of the denitrification pathway and other nitrite metabolisms within global oxygen deficient zones. | LitMetric

AI Article Synopsis

  • Oxygen deficient zones (ODZs) are crucial for oceanic nitrogen loss, accounting for about 30% of this process primarily through denitrification, which can involve complete or partial pathways by different microorganisms.
  • Recent studies using metagenomics show a significant diversity of denitrification genes in ODZs, but the specific identities and relationships of these microorganisms remain largely unknown.
  • Analysis of genomes from ODZ metagenomes reveals that partial denitrifiers, especially single-step denitrifiers, dominate these environments, with distinct communities for each nitrogen transformation based on taxonomic identity and motility traits.

Article Abstract

Oxygen deficient zones (ODZs) account for about 30% of total oceanic fixed nitrogen loss via processes including denitrification, a microbially mediated pathway proceeding stepwise from NO to N. This process may be performed entirely by complete denitrifiers capable of all four enzymatic steps, but many organisms possess only partial denitrification pathways, either producing or consuming key intermediates such as the greenhouse gas NO. Metagenomics and marker gene surveys have revealed a diversity of denitrification genes within ODZs, but whether these genes co-occur within complete or partial denitrifiers and the identities of denitrifying taxa remain open questions. We assemble genomes from metagenomes spanning the ETNP and Arabian Sea, and map these metagenome-assembled genomes (MAGs) to 56 metagenomes from all three major ODZs to reveal the predominance of partial denitrifiers, particularly single-step denitrifiers. We find niche differentiation among nitrogen-cycling organisms, with communities performing each nitrogen transformation distinct in taxonomic identity and motility traits. Our collection of 962 MAGs presents the largest collection of pelagic ODZ microorganisms and reveals a clearer picture of the nitrogen cycling community within this environment.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10359470PMC
http://dx.doi.org/10.1038/s43705-023-00284-yDOI Listing

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