Typing of food-borne Listeria monocytogenes by the optimized repetitive extragenic palindrome-based polymerase chain reaction
Pangallo, D.; Karpísková, R.; Turna, J.; Kuchta, T.
New Microbiologica 25(4): 449-454
2002
ISSN/ISBN: 1121-7138 PMID: 12437224 Document Number: 540878
The repetitive extragenic palindrome (REP)-based polymerase chain reaction (PCR) was optimized for typing Listeria monocytogenes by (1) using the QIAamp method to increase the reproducibility of DNA isolation, (2) running PCR with 3 different DNA concentrations in parallel, (3) using antibody-protected thermostable DNA polymerase to reduce non-specific priming, and (4) using an improved temperature programme to increase the amplification yield. When applied to 42 L. monocytogenes strains isolated from food in the Czech and Slovak republics during 1999-2000, profiles of 7-15 DNA fragments of 330-3310 bp were amplified. Based on REP-profiles, strains (serotypes 1/2 and 4) could be divided into 12 groups.