This method is meant to enable species identification or assignment of bacterial nucleotide sequence to a taxonomical group of bacteria since the target sequence includes variable and highly variable sequences that might serve as signature sequences. Therefore the herein described PCR method should be performed and followed by sequence analysis of the amplified PCR product (Official Collection of Methods according to § 28b GenTG, G 21.40-1).

Part of the qualitative duplex real-time PCR (TaqMan) method for detection of Cauliflower mosaic virus 35S promoter and nopaline synthase terminator (partim T-nos) (ISO 21569 AMD1)

Part of the qualitative triplex real-time PCR (TaqMan) method for detection of Ti plasmid (AgroBorder) sequences and a sequence of the Cassava vein mosaic virus promoter pat construct (P-CsVMV-pat) for screening for components of genetically modified organisms in food (Official Collection of Methods according to § 64 LFGB, L 00.00-176)

In term of food and feed safety, to evaluate the level of risks of likely AMR (antimicrobial resistance) gene acquisition by pathogens and gut microbiota, it is essential to determine if the full-length AMR genes are present. In order to assess the presence of the full-length cat gene a successive nested-PCR method can be performed to amplify a large fragment of the cat gene be performed (Fraiture et al. 2020) (see Related Methods QL-ELE-cat-F1/R1 and QL-ELE-cat-F2/R2).

In detail, the potential presence of the chloramphenicol marker is first screened using a real-time PCR method (see Related Methods QL-ELE-cat-F/R). In case a positive real-time PCR signal is obtained, the presence of the full-length chloramphenicol marker is then evaluated by a nested-PCR consisting of the related method QL-ELE-cat-F1/cat-R1 and this method.