PCR-based identification of Vibrio cholerae and the closely related species Vibrio mimicus using the large chromosomal ori sequence of Vibrio cholerae

Arjun Saha, Reema Deb, Sangita Shah, Thandavarayan Ramamurthy, Sumio Shinoda, Asish K. Mukhophadyay, Rupak K. Bhadra

Research output: Contribution to journalArticle

10 Citations (Scopus)


The bacterial chromosomal replication origin (ori) sequences are a highly conserved essential genetic element. In this study, the large chromosomal replication origin sequence of Vibrio cholerae (oriCIVC) has been targeted for identification of the organism, including the biotypes of serogroup O1. The oriCIVC sequence-based PCR assay specifically amplified an 890 bp fragment from all the V. cholerae strains examined. A point mutation in the oriCIVC sequence of the classical biotype of O1 serogroup led to the loss of a BglII site, which was utilized for differentiation from El Tor vibrios. Interestingly, the PCR assay amplified a similarly sized ori segment, designated as oriCIVM, from V. mimicus strains, but failed to produce any amplicon with other strains. Cloning and sequencing of the oriCI VM revealed high sequence similarity (96%) with oriCIVC. The results indicate that V. mimicus is indeed very closely related to V. cholerae. In addition, the BglII restriction fragment length polymorphism (RFLP) between oriCIVM and oriCIVC sequences allowed us to differentiate the two species. The ori sequence-based PCR-RFLP assay developed in this study appears to be a useful method for rapid identification and differentiation of V. cholerae and V. mimicus strains, as well as for the delineation of classical and El Tor biotypes of V. cholerae O1.

Original languageEnglish
Pages (from-to)84-91
Number of pages8
JournalFEMS Microbiology Letters
Issue number1
Publication statusPublished - Apr 2006
Externally publishedYes



  • Classical
  • El Tor
  • oriCI
  • oriCI
  • Vibrio cholerae
  • Vibrio mimicus

ASJC Scopus subject areas

  • Genetics
  • Molecular Biology
  • Applied Microbiology and Biotechnology
  • Microbiology

Cite this