FN Archimer Export Format
PT J
TI Transcriptomic evidence for versatile metabolic activities of mercury cycling microorganisms in brackish microbial mats
BT 
AF VIGNERON, Adrien
   CRUAUD, Perrine
   AUBE, Johanne
   GUYONEAUD, Remy
   GONI-URRIZA, Marisol
AS 1:1;2:;3:1,2;4:1;5:1;
FF 1:;2:;3:;4:;5:;
C1 Université de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, Pau, France
   Independent Researcher, Lourenties, France
C2 UNIV PAU ET DES PAYS DE L’ADOUR, FRANCE
   Independent Researcher, Lourenties, France
IN DOAJ
IF 8.462
TC 15
UR https://archimer.ifremer.fr/doc/00738/84954/89943.pdf
   https://archimer.ifremer.fr/doc/00738/84954/89944.xlsx
   https://archimer.ifremer.fr/doc/00738/84954/89945.pdf
LA English
DT Article
AB Methylmercury, biomagnifying through food chains, is highly toxic for aquatic life. Its production and degradation are largely driven by microbial transformations; however, diversity and metabolic activity of mercury transformers, resulting in methylmercury concentrations in environments, remain poorly understood. Microbial mats are thick biofilms where oxic and anoxic metabolisms cooccur, providing opportunities to investigate the complexity of the microbial mercury transformations over contrasted redox conditions. Here, we conducted a genome-resolved metagenomic and metatranscriptomic analysis to identify putative activity of mercury reducers, methylators and demethylators in microbial mats strongly contaminated by mercury. Our transcriptomic results revealed the major role of rare microorganisms in mercury cycling. Mercury methylators, mainly related to Desulfobacterota, expressed a large panel of metabolic activities in sulfur, iron, nitrogen, and halogen compound transformations, extending known activities of mercury methylators under suboxic to anoxic conditions. Methylmercury detoxification processes were dissociated in the microbial mats with methylmercury cleavage being carried out by sulfide-oxidizing Thiotrichaceae and Rhodobacteraceae populations, whereas mercury reducers included members of the Verrucomicrobia, Bacteroidetes, Gammaproteobacteria, and different populations of Rhodobacteraceae. However most of the mercury reduction was potentially carried out anaerobically by sulfur- and iron-reducing Desulfuromonadaceae, revising our understanding of mercury transformers ecophysiology. 
PY 2021
PD NOV
SO Npj Biofilms And Microbiomes
SN 2055-5008
PU Nature Portfolio
VL 7
IS 1
UT 000720640300001
DI 10.1038/s41522-021-00255-y
ID 84954
ER

EF