title: Gene silencing by the tRNA maturase tRNase ZL under the direction of small-guide RNA.
abstract: We have been developing a unique system for the downregulation of a gene expression through cutting a specific mRNA by the long form of tRNA 3'-processing endoribonuclease (tRNase Z(L)) under the direction of small-guide RNA (sgRNA). However, the efficacy of this system and the involvement of tRNase Z(L) in the living cells were not clear. Here we show, by targeting the exogenous luciferase gene, that the efficacy of the sgRNA/tRNase Z(L) method can become comparable to that of the RNA interference technology and that the gene silencing is owing to tRNase Z(L) directed by sgRNA not owing to a simple antisense effect. We also show that tRNase Z(L) together with sgRNA can downregulate expression of the endogenous human genes Bcl-2 and glycogen synthase kinase-3beta by degrading their mRNAs in cell culture. Furthermore, we demonstrate that a gene expression in the livers of postnatal mice can be inhibited by an only seven-nucleotide sgRNA. These data suggest that sgRNA might be utilized as therapeutic agents to treat diseases such as cancers and AIDS.
authors.affiliation: Department of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences, Niigata, Niigata, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Nakashima
authors.forename: H
authors.initials: H
authors.lastname: Takaku
authors.forename: H S
authors.initials: HS
authors.lastname: Shibata
authors.forename: Y
authors.initials: Y
authors.lastname: Negishi
authors.forename: M
authors.initials: M
authors.lastname: Takagi
authors.forename: M
authors.initials: M
authors.lastname: Tamura
authors.forename: M
authors.initials: M
authors.lastname: Nashimoto
mesh_terms: D000818:Animals; D015152:Blotting, Northern; D015153:Blotting, Western; D015536:Down-Regulation; D004722:Endoribonucleases / Q000235:genetics / Q000378:metabolism*; D005260:Female; D015870:Gene Expression; D020868:Gene Silencing; D019254:Genes, bcl-2; D005818:Genetic Engineering; D015316:Genetic Therapy / Q000379:methods*; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000235:genetics; D038362:Glycogen Synthase Kinase 3 / Q000235:genetics; D000071679:Glycogen Synthase Kinase 3 beta; D006801:Humans; D008156:Luciferases / Q000032:analysis / Q000235:genetics; D051379:Mice; D008813:Mice, Inbred ICR; D010957:Plasmids / Q000008:administration & dosage; D012333:RNA, Messenger / Q000032:analysis; D012343:RNA, Transfer / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014162:Transfection / Q000379:methods; D058727:RNA, Small Untranslated
chemical_list: D012333:RNA, Messenger; D012343:RNA, Transfer; D008156:Luciferases; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases; C000605506:GSK3B protein, human; D000071679:Glycogen Synthase Kinase 3 beta; C000605507:Gsk3b protein, mouse; D038362:Glycogen Synthase Kinase 3; D004722:Endoribonucleases; D058727:RNA, Small Untranslated