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Streptococcal taxonomy based on genome sequence analyses.

Cristiane C Thompson1, Vanessa E Emmel1, Erica L Fonseca1

  • 1Laboratory of Molecular Genetics of Microorganisms, Oswaldo Cruz Institute (IOC - FIOCRUZ) Avenida Brasil 4365, Manguinhos, Rio de Janeiro, P. O. Box 926, Zip Code 21040-360, Brazil.

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|December 24, 2013
PubMed
Summary
This summary is machine-generated.

Accurate species identification of viridans streptococci is challenging. Genomic analyses like multilocus sequence analysis (MLSA), average amino acid identity (AAI), and genome-to-genome distances (GGD) provide robust markers for Streptococcus species identification.

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Area of Science:

  • Microbiology
  • Genomics
  • Bioinformatics

Background:

  • The viridans streptococci group is clinically significant, but species-level identification remains problematic.
  • Accurate taxonomic classification is crucial for understanding bacterial diversity and clinical relevance.

Purpose of the Study:

  • To evaluate the utility of various genomic analyses for precise species identification within the Streptococcus genus.
  • To establish genomic criteria for defining Streptococcus species.

Main Methods:

  • Comparative genomic analyses of 67 complete Streptococcus genome sequences (19 species).
  • Utilized multilocus sequence analysis (MLSA), average amino acid identity (AAI), genomic signatures, genome-to-genome distances (GGD), and codon usage bias.
  • Assessed the discriminatory power of each genomic tool for species delineation.

Main Results:

  • Multilocus sequence analysis (MLSA), average amino acid identity (AAI), and genome-to-genome distances (GGD) proved to be robust markers for Streptococcus species identification.
  • Proposed criteria: Streptococcus species share ≥ 95% DNA similarity in MLSA and AAI, and > 70% DNA identity in GGD.
  • Genomic signatures and codon usage bias showed less utility for species-level differentiation in this study.

Conclusions:

  • Genomic approaches, particularly MLSA, AAI, and GGD, offer reliable methods for Streptococcus species identification.
  • The proposed genomic criteria facilitate a more advanced understanding of bacterial diversity and taxonomy.
  • This study provides a framework for improved taxonomic classification of clinically important streptococci.