Abstract
The central DNA flap is an important component of lentiviral vectors, but its significance in the context of wild-type human immunodeficiency virus (HIV) is currently unclear. To address this issue, we have compared the in vitro infection kinetics of NL4-3 with those of a flap-deficient mutant and evaluated the in vivo growth characteristics of these viruses by using the SCID-hu mouse model of HIV infection. Flap-deficient virus was only modestly attenuated in vitro, as assessed by single-round and spreading infection assays, and exhibited levels of replication and pathogenesis close to those of the wild-type in vivo. Hence, an intact central flap is not essential for HIV replication.
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