Figure 5.

Human immunodeficiency virus type 1 escapes from short hairpin RNA Nef. The human immunodeficiency virus type 1 (HIV-1) LAI proviral genome and the short hairpin RNA (shRNA) Nef target site are indicated. SupT1 cells expressing shRNA Nef were infected with HIV-1 and passaged twice a week until viral escape occurred. Nine different cultures were examined in parallel and the day of sampling is indicated. Part of the nef gene is shown with the shRNA Nef target site highlighted in gray. Numbers refer to the nucleotide position in the nef gene. Escape was apparent by (1) one or more escape mutations in the target sequence; (2) mutations outside the target region; and (3) complete or partial deletions of the target region. Mutations are underlined. Adapted from[13].