The cytidine deaminase CEM15 induces hypermutation in newly synthesized HIV-1 DNA

Hui Zhang (), Bin Yang, Roger J. Pomerantz, Chune Zhang, Shyamala C. Arunachalam and Ling Gao
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Hui Zhang: Thomas Jefferson University
Bin Yang: Thomas Jefferson University
Roger J. Pomerantz: Thomas Jefferson University
Chune Zhang: Thomas Jefferson University
Shyamala C. Arunachalam: Thomas Jefferson University
Ling Gao: Thomas Jefferson University

Nature, 2003, vol. 424, issue 6944, 94-98

Abstract: Abstract High mutation frequency during reverse transcription has a principal role in the genetic variation of primate lentiviral populations. It is the main driving force for the generation of drug resistance and the escape from immune surveillance. G to A hypermutation is one of the characteristics of primate lentiviruses, as well as other retroviruses, during replication in vivo and in cell culture1,2,3,4,5,6. The molecular mechanisms of this process, however, remain to be clarified. Here, we demonstrate that CEM15 (also known as apolipoprotein B mRNA editing enzyme, catalytic polypeptide-like 3G; APOBEC3G)7,8, an endogenous inhibitor of human immunodeficiency virus type 1 (HIV-1) replication, is a cytidine deaminase and is able to induce G to A hypermutation in newly synthesized viral DNA. This effect can be counteracted by the HIV-1 virion infectivity factor (Vif). It seems that this viral DNA mutator is a viral defence mechanism in host cells that may induce either lethal hypermutation or instability of the incoming nascent viral reverse transcripts, which could account for the Vif-defective phenotype. Importantly, the accumulation of CEM15-mediated non-lethal hypermutation in the replicating viral genome could potently contribute to the genetic variation of primate lentiviral populations.

Date: 2003
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DOI: 10.1038/nature01707

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