Evolution of HIV-1 Isolates that Use a Novel Vif-Independent Mechanism to Resist Restriction by Human APOBEC3G

Guylaine Haché, Keisuke Shindo, John S. Albin, Reuben S. Harris

Producción científica: Articlerevisión exhaustiva

69 Citas (Scopus)


The human APOBEC3G protein restricts the replication of Vif-deficient HIV-1 by deaminating nascent viral cDNA cytosines to uracils, leading to viral genomic strand G-to-A hypermutations [1-4]. However, the HIV-1 Vif protein triggers APOBEC3G degradation, which helps to explain why this innate defense does not protect patients [5]. The APOBEC3G-Vif interaction is a promising therapeutic target, but the benefit of the enabling of HIV-1 restriction in patients is unlikely to be known until Vif antagonists are developed. As a necessary prelude to such studies, cell-based HIV-1 evolution experiments were done to find out whether APOBEC3G can provide a long-term block to Vif-deficient virus replication and, if so, whether HIV-1 variants that resist restriction would emerge. APOBEC3G-expressing T cells were infected with Vif-deficient HIV-1. Virus infectivity was suppressed in 45/48 cultures for more than five weeks, but replication was eventually detected in three cultures. Virus-growth characteristics and sequencing demonstrated that these isolates were still Vif-deficient and that in fact, these viruses had acquired a promoter mutation and a Vpr null mutation. Resistance occurred by a novel tolerance mechanism in which the resistant viruses packaged less APOBEC3G and accumulated fewer hypermutations. These data support the development of antiretrovirals that antagonize Vif and thereby enable endogenous APOBEC3G to suppress HIV-1 replication.

Idioma originalEnglish (US)
Páginas (desde-hasta)819-824
Número de páginas6
PublicaciónCurrent Biology
EstadoPublished - jun 3 2008
Publicado de forma externa

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology
  • General Agricultural and Biological Sciences


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