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首页> 外文期刊>Environmental Science & Technology >Mercury Methylation Genes Identified across Diverse Anaerobic Microbial Guilds in a Eutrophic Sulfate-Enriched Lake
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Mercury Methylation Genes Identified across Diverse Anaerobic Microbial Guilds in a Eutrophic Sulfate-Enriched Lake

机译：在富营养的硫酸盐湖中不同厌氧微生物公会中鉴定的汞甲基化基因

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摘要

Mercury (Hg) methylation is a microbially mediated process that converts inorganic Hg into bioaccumulative, neurotoxic methylmercury (MeHg). The metabolic activity of methylating organisms is highly dependent on biogeochemical conditions, which subsequently influences MeHg production. However, our understanding of the ecophysiology of methylators in natural ecosystems is still limited. Here, we identified potential locations of MeHg production in the anoxic, sulfidic hypolimnion of a freshwater lake. At these sites, we used shotgun metagenomics to characterize microorganisms with the Hg-methylation gene hgcA. Putative methylators were dominated by hgcA sequences divergent from those in well-studied, confirmed methylators. Using genome-resolved metagenomics, we identified organisms with hgcA (hgcA+) within the Bacteroidetes and the recently described Kiritimatiellaeota phyla. We identified hgcA+ genomes derived from sulfate-reducing bacteria, but these accounted for only 22% of hgcA+ genome coverage. The most abundant hgcA+ genomes were from fermenters, accounting for over half of the hgcA gene coverage. Many of these organisms also mediate hydrolysis of polysaccharides, likely from cyanobacterial blooms. This work highlights the distribution of the Hg-methylation genes across microbial metabolic guilds and indicate that primary degradation of polysaccharides and fermentation may play an important but unrecognized role in MeHg production in the anoxic hypolimnion of freshwater lakes.
机译：汞（Hg）甲基化是一种微生物介导的方法，将无机Hg转化为生物累积，神经毒性甲基汞（MeHG）。甲基化生物的代谢活性高度依赖于生物地球化学条件，随后影响MEHG生产。然而，我们对天然生态系统中甲基甲酸甲基物的生态学的理解仍然有限。在这里，我们确定了淡水湖的缺氧，硫化性低压中的Mehg生产的潜在位置。在这些位点，我们使用霰弹枪偏心组学与Hg-甲基化基因HGCA表征微生物。推定的甲基甲醇甲基化物由HGCA序列从研究中的那些，确认的甲基甲基乙酶发散。使用基因组分离的偏心组合，我们鉴定了在菌体内的HGCA（HGCA +）和最近描述的kiritimatiellaeota phyla的生物。我们确定了源自硫酸盐还原细菌的HGCA +基因组，但这些仅占HGCA +基因组覆盖率的22％。最丰富的HGCA +基因组来自发酵罐，占HGCA基因覆盖率的一半。许多这些有机体也介导多糖的水解，可能来自蓝藻绽放。这项工作突出了微生物代谢公会的Hg-甲基化基因的分布，并表明多糖和发酵的初级降解可能在淡水湖泊缺氧低调中的Mehg生产中起着重要但无法识别的作用。

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  • 来源
    《Environmental Science & Technology》 |2020年第24期|15840-15851|共12页
  • 作者

    Benjamin D. Peterson; Elizabeth A. McDaniel; Anna G. Schmidt; Ryan F. Lepak; Sarah E. Janssen; Patricia Q. Tran; Robert A. Marick; Jacob M. Ogorek; John F. DeWild; David P. Krabbenhoft; Katherine D. McMahon;

  • 作者单位

    Environmental Science & Technology Program University of Wisconsin - Madison Madison Wisconsin 5.3706 United States;

    Department of Bacteriology University of Wisconsin - Madison Madison Wisconsin 53706 United States;

    Department of Bacteriology University of Wisconsin - Madison Madison Wisconsin 53706 United States;

    Environmental Science & Technology Program University of Wisconsin - Madison Madison Wisconsin 53706 United States U.S. Environmental Protection Agency Office of Research and Development Center for Computational Toxicology and Exposure Great Lakes Toxicology and Ecology Division Duluth Minnesota 55804 United States;

    U.S. Geological Survey Upper Midwest Water Science Center Mercury Research Laboratory Middleton Wisconsin 53562 United States;

    Department of Bacteriology and Department of Integrative Biology University of Wisconsin - Madison Madison Wisconsin 53706 United States;

    Department of Biochemistry University of Wisconsin - Madison Madison Wisconsin 53706 United States;

    U.S. Geological Survey Upper Midwest Water Science Center Mercury Research Laboratory Middleton Wisconsin 53562 United States;

    U.S. Geological Survey Upper Midwest Water Science Center Mercury Research Laboratory Middleton Wisconsin 53562 United States;

    U.S. Geological Survey Upper Midwest Water Science Center Mercury Research Laboratory Middleton Wisconsin 53562 United States;

    Department of Bacteriology and Department of Civil and Environmental Engineering University of Wisconsin - Madison Madison Wisconsin 53706 United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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