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Updated: Mar 21, 2026
06:09
Intratracheal Inoculation of Fischer 344 Rats with Francisella tularensis
Published on: September 30, 2017
7.6K
[CITRULLINUREIDASE GENE DIVERSITY IN THE GENUS FRANCISELLA]
Summary
Genetic diversity in the Francisella citrullinureidase (ctu) gene was analyzed. Variations in the ctu gene impact enzyme activity across Francisella subspecies, affecting bacterial virulence.
Area of Science:
- Microbiology
- Genetics
- Bioinformatics
Context:
- The genus Francisella comprises pathogenic bacteria, including Francisella tularensis and Francisella philomiragia.
- Understanding genetic variations within Francisella is crucial for assessing virulence and developing control strategies.
Purpose:
- To investigate the genetic diversity of the citrullinureidase (ctu) gene across different subspecies of Francisella.
- To correlate genetic variations in the ctu gene with citrullinureidase enzyme activity and potential implications for bacterial function.
Summary:
- In silico analysis revealed genetic diversity in the citrullinureidase (ctu) gene among Francisella tularensis subspecies (tularensis, holarctica, mediasiatica, novicida) and Francisella philomiragia.
- Subtle genetic differences were observed in the ctu gene between F. tularensis subspecies, leading to minor amino acid changes.
- The F. tularensis subspecies holarctica harbors an inactive ctu gene due to specific amino acid substitutions and premature stop codons, except in Japan biovar strains.
- Francisella novicida strains primarily possess the FTN_0827 gene encoding a C-N hydrolase, likely responsible for citrullinureidase activity, with only one strain containing the ctu gene.
Impact:
- This study highlights genetic variations in the citrullinureidase gene that may influence the pathogenicity and biochemical capabilities of Francisella species.
- Findings contribute to a deeper understanding of Francisella evolution and the genetic basis of their enzymatic activities.
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