MmuPV1 virus stock was generated by isolating MmuPV1 virions from papillomas in nude mice as described previously [18 (link),19 (link),60 (link)]. The MmuPV1 infection model was established in nude mice using quasivirions generated (as described previously [19 (link),61 (link)]) using a clone of MmuPV1 obtained in the Lambert lab. Briefly, this clone of MmuPV1 was made by performing rolling circle amplification on the virus extracts (generously provided by Dr. Aravind Ingle, ACTREC, India) from the original colony of nude mice infected with MmuPV1 [15 (link)] followed by cloning into the pUC19 vector [15 (link),16 (link)]. To encapsidate MmuPV1 genome we used pMusSHELL, a Mammalian expression plasmid with codon modified L1 and L2 genes of MmuPV1 (generously provided by Dr. Chris Buck, NIH) [60 (link)]. To confirm that the virus stock was infectious, nude mice were infected in parallel during each experiment as positive controls.
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