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Comammox in drinking water systems.

Yulin Wang1, Liping Ma1, Yanping Mao1

  • 1Environmental Biotechnology Laboratory, Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong.

Water Research
|April 9, 2017
PubMed
Summary
This summary is machine-generated.

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Complete ammonia oxidizer (comammox) bacteria were discovered in tap water globally. These findings suggest comammox are widespread in drinking water systems, impacting the nitrogen cycle.

Area of Science:

  • Microbiology
  • Environmental Science
  • Biogeochemistry

Background:

  • The discovery of complete ammonia oxidizer (comammox) bacteria has significantly altered our understanding of the global nitrogen cycle.
  • Comammox Nitrospira are key players in ammonia oxidation, a critical step in nitrification.

Purpose of the Study:

  • To identify and characterize comammox Nitrospira in drinking water systems.
  • To investigate the distribution and prevalence of comammox in tap water.

Main Methods:

  • Metagenome-assembled genomes (MAGs) were reconstructed from tap water metagenomic datasets.
  • Phylogenetic analysis was performed using ribosomal proteins, ammonia monooxygenase subunit A (amoA), hydroxylamine dehydrogenase (hao), and nitrite oxidoreductase (nxrA, nxrB) genes.
  • The presence of comammox and canonical ammonia-oxidizing microbes (AOM) was assessed using amoA-like sequences.
Keywords:
ComammoxDrinking water systemsMetagenomics

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Main Results:

  • Four MAGs of comammox Nitrospira were retrieved from tap water samples in Singapore, China, and the USA.
  • Phylogenetic analyses confirmed these MAGs are closely related to known comammox Nitrospira.
  • Comammox amoA-like sequences were detected in multiple drinking water systems, sometimes outnumbering those of ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA).

Conclusions:

  • Comammox bacteria are widely distributed in drinking water systems.
  • The presence of comammox in tap water has significant implications for the nitrogen cycle and microbial ecology within these engineered environments.