Seven-color time-resolved fluorescence hybridization analysis of human papilloma virus types

Identification of human papilloma virus (HPV) types is important in order to determine the risk of cervical carcinoma in women. This requires a technique to probe individual samples for multiple virus specificities. Here we describe simultaneous multicolor analysis of amplification products for any of seven amplified HPV types 16, 18, 31, 33, 35, 39, and 45, associated with cancer of the cervix. A seminested polymerase chain reaction was performed in a single tube using a biotinylated inner primer. Sets of amplification products, immobilized on a 96-pronged manifold solid support, were rendered single stranded and probed with a mix of seven type-specific, differentially labeled oligonucleotides. These probes contained 10 or 20 lanthanide chelates at the 5' ends with seven distinct combinations of europium, terbium, and samarium ions. The seven viral strains were correctly identified by time-resolved fluorescence measurement of the specifically hybridized probes. Using this assay format, simultaneous detection of any of seven or even more target variants is possible.