Recombination between rRNA operons created most of the ribotype variation observed in the seventh pandemic clone of Vibrio cholerae

Article Abstract:

The molecular basis of variation in Vibrio cholera ribotypes is investigated in 47 isolates over 33 years through the analysis of specific enzyme markers and the intergenic spacers between the genes for RNA located at the 16S and 23S ribosomal subunits. Results reveal at least eight recombination events and deletion of tandem operons giving rise to a high degree of ribotype variability. Further, the recombination rate is very high as evidenced by the discovery of new ribotypes within the study period.

Vibrio cholerae, Ribosomal RNA, Variation (Biology)

---

Molecular evolution of the GDP-mannose pathway genes (manB and manC) in Salmonella enterica

Article Abstract:

Results demonstrate that several Salmonella enterica strains exhibit a manB gene, which display a 93 to 99% DNA identity to the colanic acid manB gene of the bacterium. However, the manC genes differ from those of manB genes indicating that these two gene sets have evolved independently.

Australia, Bacterial genetics, Microbial polysaccharides, Heredity

---

Genetic variation of dTDP-L-rhamnose pathway genes in Salmonella enterica

Article Abstract:

Researchers show that the O antigen of Salmonella has been transferred between species and subspecies of S. enterica. The O antigen is a surface component of Gram-negative bacteria.

Similar abstracts:

• Abstracts: Comparative genomic analyses of the vibrio pathogenicity island and cholera toxin prophage regions in nonepidemic serogroup strains of Vibrio cholerae
• Abstracts: Genetic differentiation, geographic variation and hybridization in gulls of the Larus glaucescens-occidentalis complex
• Abstracts: Generation means analysis of the twin-ear trait in maize. Genetic variability as affected by selection in Iowa Stiff Stalk Synthetic Maize
• Abstracts: Further identification of homologous genes in Tribolium castaneum (Herbst) and T. freemani hinton (Coleoptera: Tenebrionidae) through hybridization
• Abstracts: Biosynthesis of the exopolysaccharide galactoglucan in Sinorhizobium meliloti is subject to a complex control by the phosphate-dependent regulator PhoB and the proteins ExpG and MucR

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.