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Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
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Enigmatic, ultrasmall, uncultivated Archaea.

Brett J Baker1, Luis R Comolli, Gregory J Dick

  • 1Department of Earth and Planetary Science and Environmental Science, University of California, Berkeley, CA 94720, USA.

Proceedings of the National Academy of Sciences of the United States of America
|April 28, 2010
PubMed
Summary
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Researchers reconstructed genomes of ultrasmall archaea (ARMAN) from acidic environments. These organisms exhibit unique genes and interactions, offering insights into early archaeal evolution near the Cren- and Euryarchaeotal divergence.

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Area of Science:

  • Microbiology
  • Genomics
  • Evolutionary Biology

Background:

  • Metagenomics enables studying uncultivated microorganisms, but knowledge gaps persist, especially for low-abundance Archaea in extreme environments.
  • Ultrasmall cells (<500 nm) from lineages near the crenarchaeal/euryarchaeal divide have been detected in acidic ecosystems.
  • These organisms lack cultivated representatives, hindering detailed study.

Purpose of the Study:

  • To reconstruct and analyze the genomes of ultrasmall, uncultivated archaea from acidic environments.
  • To investigate the genetic makeup and potential functions of these organisms.
  • To understand their evolutionary position and interspecies interactions.

Main Methods:

  • Metagenomic sequencing of environmental samples and biofilm filtrate.
  • Genome reconstruction of three archaeal Richmond Mine acidophilic nanoorganisms (ARMAN) lineages.
  • Analysis of gene content, coding density, protein homology, and 3D cryo-electron tomography.

Main Results:

  • Near-complete, ~1-Mb composite genomes were reconstructed for three ARMAN lineages.
  • Two lineages possess exceptionally small genomes with high coding density and noncontiguous genes.
  • Significant portions of ARMAN genes lacked identifiable functions or clustered with bacterial orthologs, suggesting unique physiology and potential horizontal gene transfer.
  • Cryo-electron tomography revealed interactions between ARMAN and Thermoplasmatales, including membrane penetration.

Conclusions:

  • ARMAN organisms represent a unique archaeal lineage branching near the divergence of Cren- and Euryarchaeota.
  • Their genomes reveal novel genetic elements and adaptations to extreme environments.
  • Interspecies interactions and unique cellular structures highlight extensive, previously unrecognized archaeal physiology.