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Imaging 2 different molecular-genetic events in a single subject by PET is essential in a variety of in vivo applications. Using herpes simplex virus-1 thymidine kinase (HSV1-tk) mutants with narrower substrate specificities in combination with wild-type HSV1-tk (wtHSV1-tk) would enable differential imaging with corresponding radiotracers, namely 2'-deoxy-2'-(18)F-fluoro-5-ethyl-1-beta-d-arabinofuranosyl-uracil ((18)F-FEAU) and the acycloguanosine derivative 9-(4-(18)F-fluoro-3-[hydroxymethyl]butyl)guanine ((18)F-FHBG). In this study, we evaluated wtHSV1-tk and the A168H mutant, which has been reported to exhibit enhanced acycloguanosine substrate catalytic activity and diminished pyrimidine phosphorylating activity, as PET reporter genes.

Molecular–Genetic PET Imaging Using an HSV1-tk Mutant Reporter Gene with Enhanced Specificity to Acycloguanosine Nucleoside Analogs