title: Use of modified U1 snRNAs to inhibit HIV-1 replication.
abstract: Control of RNA processing plays a central role in regulating the replication of HIV-1, in particular the 3' polyadenylation of viral RNA. Based on the demonstration that polyadenylation of mRNAs can be disrupted by the targeted binding of modified U1 snRNA, we examined whether binding of U1 snRNAs to conserved 10 nt regions within the terminal exon of HIV-1 was able to inhibit viral structural protein expression. In this report, we demonstrate that U1 snRNAs complementary to 5 of the 15 regions targeted result in significant suppression of HIV-1 protein expression and viral replication coincident with loss of viral RNA. Suppression of viral gene expression is dependent upon appropriate assembly of a U1 snRNP particle as mutations of U1 snRNA that affect binding of U1 70K or Sm proteins significantly reduced efficacy. However, constructs lacking U1A binding sites retained significant anti-viral activity. This finding suggests a role for these mutants in situations where the wild-type constructs cause toxic effects. The conserved nature of the sequences targeted and the high efficacy of the constructs suggests that this strategy has significant potential as an HIV therapeutic.
authors.affiliation: Department of Medical Genetics and Microbiology, Toronto, Ontario, Canada.
authors.forename: R
authors.initials: R
authors.lastname: Sajic
authors.forename: K
authors.initials: K
authors.lastname: Lee
authors.forename: K
authors.initials: K
authors.lastname: Asai
authors.forename: D
authors.initials: D
authors.lastname: Sakac
authors.forename: D R
authors.initials: DR
authors.lastname: Branch
authors.forename: C
authors.initials: C
authors.lastname: Upton
authors.forename: A
authors.initials: A
authors.lastname: Cochrane
mesh_terms: D019380:Anti-HIV Agents / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology; D001483:Base Sequence; D002460:Cell Line; D019295:Computational Biology; D005091:Exons; D015967:Gene Expression Regulation, Viral; D015497:HIV-1 / Q000187:drug effects* / Q000235:genetics / Q000502:physiology; D006801:Humans; D008969:Molecular Sequence Data; D009154:Mutation; D012333:RNA, Messenger / Q000737:chemistry; D012342:RNA, Small Nuclear / Q000737:chemistry / Q000235:genetics* / Q000494:pharmacology*; D012367:RNA, Viral / Q000737:chemistry; D017412:Ribonucleoprotein, U1 Small Nuclear / Q000378:metabolism; D014764:Viral Proteins / Q000096:biosynthesis / Q000235:genetics; D014779:Virus Replication / Q000187:drug effects* / Q000235:genetics
chemical_list: D019380:Anti-HIV Agents; D012333:RNA, Messenger; D012342:RNA, Small Nuclear; D012367:RNA, Viral; D017412:Ribonucleoprotein, U1 Small Nuclear; C405483:U1 small nuclear RNA; D014764:Viral Proteins