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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Infectious molecular clones with the nonhomologous dimer initiation sequences found in different subtypes of human immunodeficiency virus type 1 can recombine and initiate a spreading infection in vitro.
Journal of Virology 1998 May
Recombinant forms of human immunodeficiency virus type 1 (HIV-1) have been shown to be of major importance in the global AIDS pandemic. Viral RNA dimer formation mediated by the dimerization initiation sequence (DIS) is believed to be essential for viral genomic RNA packaging and therefore for RNA recombination. Here, we demonstrate that HIV-1 recombination and replication are not restricted by variant DIS loop sequences. Three DIS loop forms found among HIV-1 isolates, DIS (CG), DIS (TA), and DIS (TG), when introduced into deletion mutants of HIV-1 recombined efficiently, and the progeny virions replicated with comparable kinetics. A fourth DIS loop form, containing an artificial AAAAAA sequence disrupting the putative DIS loop-loop interactions [DIS (A6)], supported efficient recombination with DIS loop variants; however, DIS (A6) progeny virions exhibited a modest replication disadvantage in mixed cultures. Our studies indicate that the nonhomologous DIS sequences found in different HIV-1 subtypes are not a primary obstacle to intersubtype recombination.
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