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Bacillus anthracis evolution and epidemiology.

P Keim1, K L Smith

  • 1Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011-5640, USA. Paul.Keim@nau.edu

Current Topics in Microbiology and Immunology
|September 13, 2002
PubMed
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Bacillus anthracis exhibits limited genetic diversity globally, with variations primarily found in variable number tandem repeats (VNTRs). These VNTR differences help map the pathogen's evolutionary relationships and clonal structure.

Area of Science:

  • Microbiology
  • Genetics
  • Evolutionary Biology

Background:

  • Bacillus anthracis is a globally distributed pathogen with surprisingly low genetic diversity.
  • Subtle phenotypic variations exist, but their genetic underpinnings remain largely unknown.
  • Few single nucleotide differences have been identified among isolates.

Purpose of the Study:

  • To investigate the genetic basis of Bacillus anthracis plasticity.
  • To understand the phylogenetic relationships among global B. anthracis isolates.
  • To explore the influence of the spore phase on B. anthracis evolution.

Main Methods:

  • Analysis of single nucleotide differences among isolates.
  • Characterization of highly variable sequences, specifically variable number tandem repeats (VNTRs).

Related Experiment Videos

  • Phylogenetic analysis based on VNTR sequence variations.

    • Main Results:

    • Variable number tandem repeats (VNTRs) are the primary source of genetic variability in B. anthracis.
    • VNTR analysis reveals a major clonal split (A and B branches) with further sub-clustering.
    • The A branch is globally prevalent, while the B branch holds local significance.
    • The spore phase of the B. anthracis lifecycle significantly impacts its ecology and evolution.

    Conclusions:

    • VNTR analysis is a key tool for understanding B. anthracis population structure and evolution.
    • The limited genetic diversity, contrasted with phenotypic plasticity, presents an evolutionary puzzle.
    • The spore phase is a critical factor shaping the ecological and evolutionary trajectory of Bacillus anthracis.