Revisiting the mercury cycle in marine sediments: A potential multifaceted role for Desulfobacterota - Université de Pau et des Pays de l'Adour Accéder directement au contenu
Article Dans Une Revue Journal of Hazardous Materials Année : 2024

Revisiting the mercury cycle in marine sediments: A potential multifaceted role for Desulfobacterota

Anders Lanzén
Pablo Sánchez
Diana Rojo
Marta Ferri
Eric Capo
  • Fonction : Auteur
Ion Abad-Recio
Stefan Bertilsson
Olga Sánchez
Silvia Acinas
  • Fonction : Auteur

Résumé

Marine sediments impacted by urban and industrial pollutants are typically exposed to reducing conditions and represent major reservoirs of toxic mercury species. Mercury methylation mediated by anaerobic microorganisms is favored under such conditions, yet little is known about potential microbial mechanisms for mercury detoxification. We used culture-independent (metagenomics, metabarcoding) and culture-dependent approaches in anoxic marine sediments to identify microbial indicators of mercury pollution and analyze the distribution of genes involved in mercury reduction (merA) and demethylation (merB). While none of the isolates featured merB genes, 52 isolates, predominantly affiliated with Gammaproteobacteria, were merA positive. In contrast, merA genes detected in metagenomes were assigned to different phyla, including Desulfobacterota, Actinomycetota, Gemmatimonadota, Nitrospirota, and Pseudomonadota. This indicates a widespread capacity for mercury reduction in anoxic sediment microbiomes. Notably, merA genes were predominately identified in Desulfobacterota, a phylum previously associated only with mercury methylation. Marker genes involved in the latter process (hgcAB) were also mainly assigned to Desulfobacterota, implying a potential central and multifaceted role of this phylum in the mercury cycle. Network analysis revealed that Desulfobacterota were associated with anaerobic fermenters, methanogens and sulfur-oxidizers, indicating potential interactions between key players of the carbon, sulfur and mercury cycling in anoxic marine sediments.
Fichier principal
Vignette du fichier
1-s2.0-S0304389423024044-main.pdf (5.78 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04379523 , version 1 (04-03-2024)

Identifiants

Citer

Blanca Rincón-Tomás, Anders Lanzén, Pablo Sánchez, Mónica Estupiñán, Isabel Sanz-Sáez, et al.. Revisiting the mercury cycle in marine sediments: A potential multifaceted role for Desulfobacterota. Journal of Hazardous Materials, 2024, 465, pp.133120. ⟨10.1016/j.jhazmat.2023.133120⟩. ⟨hal-04379523⟩
43 Consultations
5 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More