title: Novel restriction factor RNA-associated early-stage anti-viral factor (REAF) inhibits human and simian immunodeficiency viruses.
abstract: BACKGROUND
  The discovery of novel anti-viral restriction factors illuminates unknown aspects of innate sensing and immunity. We identified RNA-associated Early-stage Anti-viral Factor (REAF) using a whole genome siRNA screen for restriction factors to human immunodeficiency virus (HIV) that act in the early phase of viral replication.
  
  
  RESULTS
  We observed more than 50 fold rescue of HIV-1 infection, using a focus forming unit (FFU) assay, following knockdown of REAF by specific siRNA. Quantitative PCR was used to show that REAF knockdown results in an increase of early and late reverse transcripts which impacts the level of integration. REAF thus appears to act at an early stage of the viral life cycle during reverse transcription. Conversely when REAF is over-expressed in target cells less infected cells are detectable and fewer reverse transcripts are produced. Human REAF can also inhibit HIV-2 and simian immunodeficiency virus (SIV) infection. REAF associates with viral nucleic acids and may act to prevent reverse transcription.
  
  
  CONCLUSIONS
  This report firmly places REAF alongside APOBECs and SAMHD1 as a potent inhibitor of HIV replication acting early in the replication cycle, just after cell entry. We propose that REAF is part of an anti-viral surveillance system destroying incoming retroviruses. This novel mechanism could apply to invasion of cells by any intracellular pathogen.
authors.forename: Kelly M
authors.initials: KM
authors.lastname: Marno
authors.forename: Babatunji W
authors.initials: BW
authors.lastname: Ogunkolade
authors.forename: Corinna
authors.initials: C
authors.lastname: Pade
authors.forename: Nidia M M
authors.initials: NM
authors.lastname: Oliveira
authors.forename: Eithne
authors.initials: E
authors.lastname: O'Sullivan
authors.affiliation: Centre for Immunology and Infectious Disease, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK. a.mcknight@qmul.ac.uk.
authors.forename: Áine
authors.initials: Á
authors.lastname: McKnight
mesh_terms: D015497:HIV-1 / Q000276:immunology* / Q000502:physiology; D015498:HIV-2 / Q000276:immunology* / Q000502:physiology; D006801:Humans; D007113:Immunity, Innate; D012367:RNA, Viral / Q000378:metabolism*; D060888:Real-Time Polymerase Chain Reaction; D015302:Simian Immunodeficiency Virus / Q000276:immunology*; D016662:Virus Integration
chemical_list: D012367:RNA, Viral