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Deltaproteobacteria and Spirochaetes-Like Bacteria Are Abundant Putative Mercury Methylators in Oxygen-Deficient Water and Marine Particles in the Baltic Sea

Capo, Eric and Bravo, Andrea G. and Soerensen, Anne L. and Bertilsson, Stefan and Pinhassi, Jarone and Feng, Caiyan and Andersson, Anders F. and Buck, Moritz and Bjorn, Erik (2020). Deltaproteobacteria and Spirochaetes-Like Bacteria Are Abundant Putative Mercury Methylators in Oxygen-Deficient Water and Marine Particles in the Baltic Sea. Frontiers in Microbiology. 11 , 574080
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Abstract

Methylmercury (MeHg), a neurotoxic compound biomagnifying in aquatic food webs, can be a threat to human health via fish consumption. However, the composition and distribution of the microbial communities mediating the methylation of mercury (Hg) to MeHg in marine systems remain largely unknown. In order to fill this knowledge gap, we used the Baltic Sea Reference Metagenome (BARM) dataset to study the abundance and distribution of the genes involved in Hg methylation (thehgcABgene cluster). We determined the relative abundance of thehgcABgenes and their taxonomic identity in 81 brackish metagenomes that cover spatial, seasonal and redox variability in the Baltic Sea water column. ThehgcABgenes were predominantly detected in anoxic water, but somehgcABgenes were also detected in hypoxic and normoxic waters. Phylogenetic analysis identified putative Hg methylators within Deltaproteobacteria, in oxygen-deficient water layers, but also Spirochaetes-like and Kiritimatiellaeota-like bacteria. Higher relative quantities ofhgcABgenes were found in metagenomes from marine particles compared to free-living communities in anoxic water, suggesting that such particles are hotspot habitats for Hg methylators in oxygen-depleted seawater. Altogether, our work unveils the diversity of the microorganisms with the potential to mediate MeHg production in the Baltic Sea and pinpoint the important ecological niches for these microorganisms within the marine water column.

Authors/Creators:Capo, Eric and Bravo, Andrea G. and Soerensen, Anne L. and Bertilsson, Stefan and Pinhassi, Jarone and Feng, Caiyan and Andersson, Anders F. and Buck, Moritz and Bjorn, Erik
Title:Deltaproteobacteria and Spirochaetes-Like Bacteria Are Abundant Putative Mercury Methylators in Oxygen-Deficient Water and Marine Particles in the Baltic Sea
Year of publishing :2020
Volume:11
Article number:574080
Number of Pages:11
Publisher:FRONTIERS MEDIA SA
ISSN:1664-302X
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Microbiology (Microbiology in the medical area to be 30109)
Keywords:mercury methylation, hgcAB, Baltic Sea, deltaproteobacteria, spirochaetes-like bacteria
URN:NBN:urn:nbn:se:slu:epsilon-p-108387
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108387
Additional ID:
Type of IDID
DOI10.3389/fmicb.2020.574080
Web of Science (WoS)000575159000001
ID Code:18074
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:04 Nov 2020 15:23
Metadata Last Modified:04 Nov 2020 15:31

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