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Comparative genomic analysis of Brucella melitensis vaccine strain M5 provides insights into virulence attenuation

Hai Jiang1, Pengcheng Du, Wen Zhang

  • 1State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Beijing, China.

Plos One
|August 23, 2013
PubMed

Insights

Comparative genomics of Brucella melitensis vaccine strain M5 reveals genomic differences from virulent strains. Key deletion and insertion regions, like RD4 and RD5, offer potential for typing Brucella strains and understanding virulence attenuation.

Area of Science:

  • Genomics
  • Microbiology
  • Veterinary Science

Background:

  • Brucella melitensis vaccine strain M5 is crucial for animal brucellosis control.
  • Understanding genomic variations between vaccine and virulent strains is vital for vaccine efficacy and strain differentiation.

Purpose of the Study:

  • To determine the whole-genome sequence of Brucella melitensis vaccine strain M5.
  • To perform a comparative genomic analysis against virulent strain 16 M and other reference strains.
  • To identify genomic regions useful for Brucella strain typing and understanding virulence attenuation.

Main Methods:

  • Whole-genome sequencing of Brucella melitensis M5.
  • Comparative genomic analysis with virulent Brucella strains.
  • Identification and characterization of deletions, insertions, single nucleotide polymorphisms (SNPs), and genomic rearrangements.

Main Results:

  • Identified 11 regions of deletion (RDs) and 2 regions of insertion (RIs) in the M5 genome.
  • RD4 and RD5 exhibited significant diversity in length and copy number, suitable for strain typing.
  • Detected SNPs in virulence-related genes (e.g., motB, aroC) and a 56 kb genomic rearrangement.
  • Comparative analysis revealed widespread genomic island inversion in Brucella.

Conclusions:

  • Comparative genomics between vaccine and wild-type Brucella strains provides insights into virulence and microevolution.
  • Specific RDs, RIs, and inversion regions are valuable for detecting genomic differences and typing Brucella strains.
  • SNPs in virulence genes may elucidate mechanisms of virulence attenuation in vaccine strains.

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