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Microbes mediate mercury (Hg) transformations, influencing environmental pollution and health. Discovering Hg methylation genes (hgcAB) reveals diverse methylating microbes and informs mitigation strategies.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Biogeochemistry

Background:

  • Microbial processes like mercury (Hg) methylation and methylmercury (MeHg) demethylation are critical for Hg cycling and environmental health.
  • These transformations, along with inorganic Hg redox reactions, significantly impact ecosystems and wildlife.
  • Understanding these microbial roles is key to addressing Hg pollution.

Purpose of the Study:

  • To review experimentally confirmed and newly discovered microbes carrying the Hg methylation genes (hgcAB).
  • To present phylogenetic and taxonomic analyses of these Hg-methylating microorganisms.
  • To summarize current knowledge on Hg transformation mechanisms, involved organisms, and environmental factors.

Main Methods:

  • Literature review of experimentally confirmed Hg methylating microbes.
  • Analysis of phylogenetic and taxonomic data for hgcAB-carrying organisms.
  • Synthesis of existing research on Hg transformation pathways and environmental influences.

Main Results:

  • Identification and characterization of diverse hgcAB-carrying Hg methylating microbes.
  • Detailed phylogenetic and taxonomic classifications of these microbial groups.
  • Compilation of data on Hg methylation, MeHg demethylation, and inorganic Hg redox transformations.

Conclusions:

  • The discovery of hgcAB genes has expanded the understanding of Hg-methylating microbial diversity.
  • This review consolidates knowledge on microbial Hg cycling, providing a basis for future research.
  • Informed strategies are needed to mitigate the impacts of environmental mercury pollution.