recA genotyping of Salmonella enteritidis phage type 4 isolates by restriction fragment length polymorphism analysis


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Abstract

Aims:To subtype Salmonella enteritidis phage type 4 isolates by using recA genotyping.Methods and Results:Random amplified polymorphic DNA analysis using a primer ERIC2 of 76 isolates of Salmonella enteritidis phage type 4 obtained in Northern Ireland in 1998 and in 1999 demonstrated the presence of five genotypes. Restriction fragment length polymorphism analysis, using a degenerate primer pair designed to amplify a segment (about 640 bp in length) of the recA gene from several members of the Enterobacteriaceae with restriction enzymes, Hha I and Sau 3AI, showed that the resulting fragments could differentiate the isolates into three groups, respectively.Conclusions:recA gene amplification and Hha I and Sau 3AI restriction digestion was demonstrated to increase the differentiating power between isolates of Salmonella enteritidis phage type 4 by combining the patterns of the random amplified polymorphic DNA analysis procedure using a primer ERIC2.Significance and Impact of the Study:A novel restriction fragment length polymorphism assay for isolates of Salmonella enteritidis phage type 4, based on the amplification of the recA gene was attained and its comparison and its combination with random amplified polymorphic DNA analysis was provided.

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