Repetitive extragenic palindromic and enterobacterial repetitive intergenic consensus sequence‐based typing of Shiga toxin‐producing Escherichia coli from bovine samples
2022
Joseph, Jomy | Sankarshanan, Mohan | Kalyanikutty, Sudha
The strain typing of Shiga toxin‐producing Escherichia coli (STEC) is challenging due to its high genetic variability. In the present study, two polymerase chain reaction (PCR)‐based typing methods—repetitive extragenic palindromic sequences PCR (REP‐PCR) and enterobacterial repetitive intergenic consensus sequences PCR (ERIC‐PCR)—are evaluated for their efficacy in differentiating the strains. The present study used 100 strains of STEC isolated from bovine meat, bovine feces, and swabs from the chopping boards. The REP‐PCR profiles showed 21 different banding patterns, whereas ERIC‐PCR profiles obtained 18 patterns among the tested strains. The dendrogram prepared by the neighbor‐joining method formed eight and seven clusters for REP and ERIC‐PCR, respectively. The discriminatory indices for the typing methods were 87.83 and 83.03% for REP and ERIC‐PCR, respectively. Thus, the clusters based on REP and ERIC‐PCR fingerprints were unambiguous and thus could be useful for phylogenetic clustering and epidemiological surveillance. The nonparametric multidimensional scaling plots showed more than 75 and 60% similarities within populations of different REP and ERIC clusters, respectively, regarding its source of isolation, serogroup, and distribution virulence markers. The REP and the ERIC sequences are good molecular markers that offer rapid, cost‐effective, and easy molecular typing for STEC strains.
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