Tamplicon-7, a novel T-lymphotropic vector derived from human herpesvirus 7

Hila Romi, Oded Singer, Debora Rapaport, Niza Frenkel

Research output: Contribution to journalArticlepeer-review


We describe the derivation of a novel T-cell-defective virus vector employing the human herpesvirus 7 (HHV-7). The new vector, designated Tamplicon-7, replicates in CD4+ T cells. The system is composed of a helper virus and defective virus genomes derived by the replication of the input Tamplicon vector. There are two cis-acting functions required for the replication and packaging of the defective virus genomes in the presence of the helper virus: the viral DNA replication origin and the composite cleavage and packaging signal, which directs the cleavage and packaging of defective virus genomes. Viral DNA replication is compatible with the rolling circle mechanism, producing large head-to-tail concatemers of the Tamplicon vector. Thus, in the presence of the helper virus, the replicated vectors are packaged and secreted into the medium. Furthermore, we have shown that the vector can be employed to express a foreign gene, encoding the green fluorescent protein, in the T cells infected with the HHV-7 helper virus. We predict that the Tamplicon-7 vector might be potentially useful for gene therapy of diseases affecting the human CD4+ T cells, including autoimmune diseases, T-cell lymphomas, and AIDS.

Original languageEnglish
Pages (from-to)7001-7007
Number of pages7
JournalJournal of Virology
Issue number8
StatePublished - 1999


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