Please use this identifier to cite or link to this item:
Files in This Item:
There are no files associated with this item.
Title: Revisiting the mercury cycle in marine sediments: A potential multifaceted role for Desulfobacterota
Authors: Rincon-Tomas, Blanca; Lanzen, Anders; Sanchez, Pablo and Estupinan, Monica; Sanz-Saez, Isabel; Bilbao, M. Elisabete and Rojo, Diana; Mendibil, Inaki; Perez-Cruz, Carla; Ferri, Marta and Capo, Eric; Abad-Recio, Ion L.; Amouroux, David and Bertilsson, Stefan; Sanchez, Olga; Acinas, Silvia G.; Alonso-Saez, Laura
Abstract: 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.
Issue Date: 2024
Publisher: ELSEVIER
Type: Article; Early Access
DOI: 10.1016/j.jhazmat.2023.133120
ISSN: 0304-3894
E-ISSN: 1873-3336
Appears in Publication types:Artículos científicos

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.