Metagenomic analysis of Antarctic sea-ice and brine reveals the presence of hgcAB-like genes in the microaerophilic marine bacterium Nitrospina. These are similar to ones responsible for mercury methylation in anaerobic microorganisms and provide a plausible mechanism for mercury methylation in oxic marine environments.
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Sunderland, E., Schartup, A. Biogeochemistry: Mercury methylation on ice. Nat Microbiol 1, 16165 (2016). https://doi.org/10.1038/nmicrobiol.2016.165
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DOI: https://doi.org/10.1038/nmicrobiol.2016.165