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. 1987 Mar;84(5):1434–1438. doi: 10.1073/pnas.84.5.1434

Mutational analysis of the human immunodeficiency virus: the orf-B region down-regulates virus replication.

P A Luciw, C Cheng-Mayer, J A Levy
PMCID: PMC304445  PMID: 2434956

Abstract

Mutations were made by recombinant DNA techniques in an infectious molecular clone of the human immunodeficiency virus San Francisco isolate 2 (HIVSF2) [formerly the prototype isolate of the acquired immunodeficiency syndrome-associated retrovirus (ARV-2)]. The effect of these changes on the replicative and cytopathologic properties of the virus was studied by transfecting modified virus clones into cultured human cells. Mutations in the gag, pol, env, and tat regions precluded virus replication and cytopathology in lymphoid cells. A mutation in orf-A dramatically reduced but did not abolish virus replication. Mutant viruses with deletions in the orf-B region were highly cytopathic and replicated to approximately 5-fold higher levels than wild-type virus. They also produced approximately 5-fold more viral DNA in infected lymphoid cells than did wild-type virus. Thus, the orf-B region may function to down-regulate virus replication. This mutational analysis of the HIVSF2 genome is a means of assessing genes regulating viral replication and cytopathology.

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