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Related Experiment Video

Updated: Aug 4, 2025

Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron OxyHydroxides, Trace Elements, and Bacteria
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River sediment microbial community composition and function impacted by thallium spill.

Shuang Yan1, Zhengke Zhang2, Ji Wang2

  • 1State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.

The Science of the Total Environment
|March 30, 2023
PubMed
Summary
This summary is machine-generated.

Sudden thallium (Tl) spills impact freshwater microbes, altering community structure and resistance genes. Proteobacteria showed Tl resistance, while metal and antibiotic resistance genes were enriched near spill sites.

Keywords:
Functional genesMetabolic pathwayMicrobial communityResistance genesRiver sedimentThallium spill

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Area of Science:

  • Environmental Science
  • Microbiology
  • Ecotoxicology

Background:

  • Thallium (Tl) is a toxic heavy metal widely used in industry, posing environmental risks.
  • Tl contamination can severely harm human health and aquatic ecosystems.
  • Understanding microbial responses to sudden Tl pollution is crucial for environmental risk assessment.

Purpose of the Study:

  • To investigate the impact of sudden thallium spills on freshwater sediment microbial communities.
  • To elucidate changes in microbial community composition and functional genes using metagenomics.
  • To assess the relationship between thallium concentration and the abundance of resistance genes.

Main Methods:

  • Metagenomic sequencing was employed to analyze microbial community structure and functional genes.
  • River sediment samples were collected from areas affected by a thallium spill.
  • Analysis included microbial community composition, functional gene abundance, and co-occurrence networks.

Main Results:

  • Thallium pollution significantly altered microbial community composition and function.
  • Proteobacteria and Cyanobacteria exhibited resistance to thallium contamination.
  • Metal resistance genes (MRGs) and antibiotic resistance genes (ARGs) were enriched at lower Tl concentrations, with a significant correlation between MRGs and ARGs.
  • Sphingopyxis was identified as a potential major host for resistance genes.

Conclusions:

  • Sudden thallium contamination profoundly impacts freshwater sediment microbial communities.
  • Microbial communities display varying resistance to thallium, with specific phyla showing resilience.
  • Thallium pollution influences the prevalence and co-occurrence of metal and antibiotic resistance genes, highlighting potential cross-resistance mechanisms.