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vrrB, a hypervariable open reading frame in Bacillus anthracis.

J M Schupp1, A M Klevytska, G Zinser

  • 1Department of Biological Sciences, Northern Arizona University, Flagstaff 86011-5640, USA.

Journal of Bacteriology
|June 27, 2000
PubMed
Summary
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Bacillus anthracis, a nearly uniform bacterium, harbors a novel gene (vrrB) with significant genetic variation. This hypervariable gene offers insights into bacterial evolution and adaptation.

Area of Science:

  • Microbiology
  • Genomics
  • Evolutionary Biology

Background:

  • Bacillus anthracis is known for its extreme genomic homogeneity.
  • This lack of variation may limit adaptive potential.
  • However, some gene regions exhibit hypervariability, suggesting localized evolutionary dynamics.

Purpose of the Study:

  • To identify and characterize novel hypervariable genetic elements in Bacillus anthracis.
  • To investigate the evolutionary implications of such variability within a largely homogeneous species.

Main Methods:

  • Analysis of genomic DNA from diverse Bacillus anthracis strains.
  • Identification and sequencing of a novel open reading frame (ORF) containing variable-number tandem repeats (VNTRs).
  • Bioinformatic analysis of the ORF's protein-coding potential and comparison with related species.

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Main Results:

  • Discovery of the vrrB gene, a ~750-nucleotide ORF with four distinct variable regions.
  • Identification of 11 vrrB alleles across eight length categories in B. anthracis strains.
  • The vrrB protein is predicted to be hydrophilic, with transmembrane domains, suggesting a membrane-associated role.
  • The vrrB ORF is conserved in Bacillus cereus, retaining its variability.

Conclusions:

  • The vrrB gene represents a significant source of genetic variation within Bacillus anthracis.
  • This hypervariability contrasts sharply with the species' overall homogeneity.
  • Such variable genes may provide a mechanism for rapid adaptation in B. anthracis and contribute to evolutionary flexibility in other bacterial species.