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<p>Magnetotactic bacteria (MTB) are capable of magnetic navigation (magnetotaxis) through the intracellular biomineralization of membrane-bound magnetic nanoparticles, known as magnetosomes, which are regulated by magnetosome gene clusters (MGCs). Despite their ubiquity near the oxic-anoxic transition zone in various aquatic environments, the diversity, abundance, and biogeochemical roles of MTB remain poorly understood due to limited large-scale studies. Here, we conducted a metagenomic survey of MGC-containing bacteria across 38 oxygen-stratified freshwater environments of northern landscapes. We reconstructed 63 MGC-containing genomes affiliated with eight bacterial phyla, including <i>Myxococcota</i>. Putative MTB exhibited high relative abundance (up to 15.4% of metagenomic reads), with <i>Deltaproteobacteria</i> identified as the most ubiquitous and predominant group. Vertical distribution profile revealed that magnetotactic <i>Deltaproteobacteria</i> primarily inhabit low-oxygen niches, suggesting their magnetofossils might serve as a potential proxy for oxygen depletion. Our findings underscore the important ecological roles of putative MTB as key components of oxygen-stratified freshwater ecosystems of northern landscapes.</p>

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Magnetosome gene cluster containing bacteria in oxygen-stratified freshwater ecosystems of northern landscapes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月8日

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  • Runjia Ji,
  • Juan Wan,
  • Kuang He,
  • Pranami Goswami,
  • Jianxun Shen,
  • Yongxin Pan,
  • Wei Lin

摘要

Magnetotactic bacteria (MTB) are capable of magnetic navigation (magnetotaxis) through the intracellular biomineralization of membrane-bound magnetic nanoparticles, known as magnetosomes, which are regulated by magnetosome gene clusters (MGCs). Despite their ubiquity near the oxic-anoxic transition zone in various aquatic environments, the diversity, abundance, and biogeochemical roles of MTB remain poorly understood due to limited large-scale studies. Here, we conducted a metagenomic survey of MGC-containing bacteria across 38 oxygen-stratified freshwater environments of northern landscapes. We reconstructed 63 MGC-containing genomes affiliated with eight bacterial phyla, including Myxococcota. Putative MTB exhibited high relative abundance (up to 15.4% of metagenomic reads), with Deltaproteobacteria identified as the most ubiquitous and predominant group. Vertical distribution profile revealed that magnetotactic Deltaproteobacteria primarily inhabit low-oxygen niches, suggesting their magnetofossils might serve as a potential proxy for oxygen depletion. Our findings underscore the important ecological roles of putative MTB as key components of oxygen-stratified freshwater ecosystems of northern landscapes.