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Related Experiment Videos

The uncultured microbial majority.

Michael S Rappé1, Stephen J Giovannoni

  • 1Department of Microbiology, Oregon State University, Corvallis, Oregon 97331, USA. michael.rappe@orst.edu

Annual Review of Microbiology
|October 7, 2003
PubMed
Summary
This summary is machine-generated.

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Microbial diversity has expanded due to 16S ribosomal RNA gene sequencing, yet most bacterial phyla remain uncultivated and unexplored. Further research is needed to understand these abundant, ecologically vital microorganisms.

Area of Science:

  • Microbiology
  • Genomics
  • Environmental Science

Background:

  • The study of microbial diversity has significantly advanced since the initial delineation of bacterial phyla using 16S ribosomal RNA (rRNA) analysis in 1987.
  • Advances in sequencing technologies have enabled the exploration of microbial communities directly from environmental DNA.

Purpose of the Study:

  • To highlight the vast unexplored microbial diversity within the bacterial domain.
  • To emphasize the gap between identified bacterial lineages and those with cultivated representatives.
  • To underscore the need for further research into the genomics and ecological roles of uncultivated bacteria.

Main Methods:

  • Comparative phylogenetic analyses of 16S ribosomal RNA genes.
  • Sequencing of ribosomal RNA genes cloned from environmental DNA.

Related Experiment Videos

  • Review of field studies on microbial abundance and distribution in diverse habitats.

    • Main Results:

    • Knowledge of microbial diversity has expanded dramatically, with approximately 52 major bacterial lineages identified.
    • Currently, only 26 of these phyla have cultivated representatives.
    • Many uncultivated phyla are abundant and ecologically significant in various environments like soil, freshwater, and seawater.

    Conclusions:

    • A significant portion of microbial diversity, particularly within the bacterial domain, remains uncultivated and poorly understood.
    • There is a critical lack of genome sequence information for uncultivated bacteria, hindering our understanding of microbial genome evolution and ecological functions.
    • Microbial diversity is largely unexplored territory, necessitating further investigation into uncultivated microorganisms.