Identification and verification of rodent cell lines by polymerase chain reaction

Cell lines represent valuable tools for basic research and diagnostic applications as well as for the production of biological products such as antibodies or vaccines. For all cell culturists, a well-identified origin of their cell lines as well as the periodic re-examination of their identity should be a basic requirement. We established a simple polymerase chain reaction (PCR) to verify or identify rodent and human cell lines. Since mouse-, rat-, Chinese hamster- and Syrian hamster-derived cell lines represent the most frequently used rodent cell lines, our investigations were focused on these species. Our assay used oligonucleotide primers annealing to sequences within the beta-actin and the beta-globin gene and to repetitive DNA. Primers were designed mostly from intron sequences of the genes aiming to amplify only one specific DNA segment and thus enabling to exclude easily false DNA. More than 130 cells lines originating from the five species were analyzed in that study. Our PCR revealed specific profiles for all species investigated. No further methods like DNA sequencing or fragment length polymorphism analysis were needed to differentiate these species. The results introduce our PCR-assay as a rapid, specific and routinely feasible tool in order to identify or distinguish rodent cell lines from each other and from human cell lines.