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  • Title: Development of molecular RAPD marker for the identification of Pediococcus acidilactici strains.
    Author: Mora D, Parini C, Fortina MG, Manachini PL.
    Journal: Syst Appl Microbiol; 2000 Oct; 23(3):400-8. PubMed ID: 11108020.
    Abstract:
    A RAPD analysis performed using a single primer targeted to the pediocin AcH/PA-1 gene was carried out on several P. acidilactici strains and on some related species of lactic acid bacteria. The high degree of genetic variability detected in P. acidilactici strains did not allow the selection of a common RAPD fragment that could be chosen as a potential species-specific DNA marker. Nevertheless a 700 bp fragment, that was found to be peculiar of all potential pediocin producer strains analyzed, was cloned and sequenced with the aim to develop a species specific PCR marker. Sequence analysis of the cloned 700 bp fragment showed one putative small open reading frame (ORF1), with no significant homology with known genes, and a partial putative second coding region (ORF2) with a high degree of similarity with several methionyl tRNA synthesis (metS) genes. The two coding regions were separated by a short spacer region. Primers targeted to ORF2 plus part of the spacer region and primers designed for the amplification of the entire cloned RAPD fragment were found to be species-specific for the detection of P. acidilactici strains. Furthermore primers designed on the ORF1 sequence allowed the amplification of a 439 bp fragment only in some P. acidilactici strains, including pediocin producing strains.
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