Global prevalence and distribution of genes and microorganisms involved in mercury methylation

Podar, Mircea; Gilmour, C. C.; Brandt, Craig C.; Soren, Allyson; Brown, Steven D.; Crable, Bryan R.; Palumbo, Anthony Vito; Somenahally, Anil C.; Elias, Dwayne A.

doi:10.1126/sciadv.1500675

Title: Global prevalence and distribution of genes and microorganisms involved in mercury methylation

Journal Article · Fri Oct 09 00:00:00 EDT 2015 · Science Advances

DOI:https://doi.org/10.1126/sciadv.1500675· OSTI ID:1224165

Podar, Mircea ^[1]; Gilmour, C. C. ^[2]; Brandt, Craig C. ^[1]; Soren, Allyson ^[2]; Brown, Steven D. ^[1]; Crable, Bryan R. ^[1]; Palumbo, Anthony Vito ^[1]; Somenahally, Anil C. ^[3]; Elias, Dwayne A. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Smithsonian Environmental Research Center, Edgewater, MD (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Texas A&M Univ., Overton, TX (United States)

Mercury methylation produces the neurotoxic, highly bioaccumulative methylmercury (MeHg). Recent identification of the methylation genes (hgcAB) provides the foundation for broadly evaluating microbial Hg-methylation potential in nature without making explicit rate measurements. We first queried hgcAB diversity and distribution in all available microbial metagenomes, encompassing most environments. The genes were found in nearly all anaerobic, but not in aerobic, environments including oxygenated layers of the open ocean. Critically, hgcAB was effectively absent in ~1500 human microbiomes, suggesting a low risk of endogenous MeHg production. New potential methylation habitats were identified, including invertebrate guts, thawing permafrost, coastal dead zones, soils, sediments, and extreme environments, suggesting multiple routes for MeHg entry into food webs. Several new taxonomic groups potentially capable of Hg-methylation emerged, including lineages having no cultured representatives. We then begin to address long-standing evolutionary questions about Hg-methylation and ancient carbon fixation mechanisms while generating a new global view of Hg-methylation potential.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1224165

Journal Information:: Science Advances, Vol. 1, Issue 9; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 293 works

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Geobacteraceae are important members of mercury-methylating microbial communities of sediments impacted by waste water releases Bravo, Andrea G.; Zopfi, Jakob; Buck, Moritz The ISME Journal, Vol. 12, Issue 3 https://doi.org/10.1038/s41396-017-0007-7	journal	January 2018
Reduced sulphur sources favour Hg ^II reduction during anoxygenic photosynthesis by Heliobacteria Lavoie, Noémie C.; Grégoire, Daniel S.; Stenzler, Bejamin R. Geobiology, Vol. 18, Issue 1 https://doi.org/10.1111/gbi.12364	journal	September 2019
A review of global environmental mercury processes in response to human and natural perturbations: Changes of emissions, climate, and land use Daniel, Obrist,; L., Kirk, Jane; Lei, Zhang, Springer https://doi.org/10.5451/unibas-ep68582	text	January 2018
Methanogens and Iron-Reducing Bacteria: the Overlooked Members of Mercury-Methylating Microbial Communities in Boreal Lakes Bravo, Andrea G.; Peura, Sari; Buck, Moritz ETH Zurich https://doi.org/10.3929/ethz-b-000307898	text	January 2018
Quantification of Mercury Bioavailability for Methylation Using Diffusive Gradient in Thin-Film Samplers Ndu, Udonna; Christensen, Geoff A.; Rivera, Nelson A. Environmental Science & Technology, Vol. 52, Issue 15 https://doi.org/10.1021/acs.est.8b00647	journal	June 2018
New Insights into the Ecology and Physiology of Methanomassiliicoccales from Terrestrial and Aquatic Environments Cozannet, Marc; Borrel, Guillaume; Roussel, Erwan Microorganisms, Vol. 9, Issue 1 https://doi.org/10.3390/microorganisms9010030	journal	December 2020

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