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Exportin-5 Mediates the Nuclear Export of Pre-Micrornas and Short Hairpin Rnas

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Exportin-5 Mediates the Nuclear Export of Pre-Micrornas and Short Hairpin Rnas Downloaded from genesdev.cshlp.org on October 5, 2021 - Published by Cold Spring Harbor Laboratory Press RESEARCH COMMUNICATION Exportin-5 mediates the miRNA biogenesis is the nuclear excision of the upper part of this RNA hairpin to give the ∼65-nt pre-miRNA nuclear export of intermediate (Lee et al. 2002; Zeng and Cullen 2003). pre-microRNAs and short This processing step is performed by human RNAse III, also called ‘Drosha’ (Lee et al. 2003). The pre-miRNA hairpin RNAs intermediate, which in the case of human miR-30 con- sists of a 63-nt hairpin bearing a 2-nt 3Ј overhang, is then 2 3 3 Rui Yi, Yi Qin, Ian G. Macara, and exported to the cytoplasm by a currently unknown Bryan R. Cullen1,2,4 mechanism. Once there, the pre-miRNA is processed by a second RNAse III family member called ‘Dicer’ to give 1 2 Howard Hughes Medical Institute and Department of the mature ∼22-nt miRNA (Grishok et al. 2001; Molecular Genetics and Microbiology, Duke University Hutvágner et al. 2001; Ketting et al. 2001). The miRNA Medical Center, Durham, North Carolina 27710, USA; is then incorporated into the RNA-induced silencing 3 Center for Cell Signaling, University of Virginia, complex (RISC), where it functions to guide RISC to ap- Charlottesville, Virginia 22908, USA propriate mRNA targets (Hammond et al. 2000; Martinez et al. 2002; Mourelatos et al. 2002; Schwarz et al. 2002). MicroRNAs (miRNAs) are initially expressed as long In addition to miRNAs, cells can also generate similar ∼ transcripts that are processed in the nucleus to yield 65- ∼22-nt noncoding RNAs called small interfering RNAs nucleotide (nt) RNA hairpin intermediates, termed pre- (siRNA), by Dicer processing of long double-stranded miRNAs, that are exported to the cytoplasm for addi- RNAs (dsRNAs; Zamore et al. 2000; Bernstein et al. tional processing to yield mature, ∼22-nt miRNAs. Here, 2001). siRNAs, which can also be introduced into cells we demonstrate that human pre-miRNA nuclear export, by transfection of synthetic siRNA duplexes (Elbashir et and miRNA function, are dependent on Exportin-5. Ex- al. 2001), can program RISCto cleave mRNAs bearing portin-5 can bind pre-miRNAs specifically in vitro, but perfectly complementary target sites. This process, only in the presence of the Ran-GTP cofactor. Short hair- termed RNA interference (RNAi; Fire et al. 1998), has emerged as a powerful technique for the analysis of gene pin RNAs, artificial pre-miRNA analogs used to express function in both invertebrate and vertebrate cells. How- small interfering RNAs, also depend on Exportin-5 for ever, because RNAi induced by artificial siRNA du- nuclear export. Together, these findings define an addi- plexes gives only a transient repression of the target tional cellular cofactor required for miRNA biogenesis gene, efforts have been made to derive vectors able to and function. produce siRNAs constitutively. The most prevalent technique for stable siRNA expression involves tran- Received October 7, 2003; revised version accepted October scription of a short hairpin RNA (shRNA) using an RNA 28, 2003. polymerase III (pol III)-dependent promoter (Brum- melkamp et al. 2002; Paddison et al. 2002). The shRNAs MicroRNAs (miRNAs) are ∼22-nucleotide (nt) noncod- that have been described generally feature perfect 19–29- ing RNAs observed in a wide range of eukaryotes. Over base pair (bp) stems with small terminal loops and a 2-nt Ј 200 genomically encoded miRNAs have been identified 3 overhang, consisting of two “U” residues, that results in several different species (Ambros 2003). Although few from termination of pol III transcription. Therefore, the animal miRNAs have been assigned a function to date, structure of shRNAs is closely analogous to the struc- the Caenorhabditis elegans let-7 and lin-4 miRNAs and ture of the miR-30 pre-miRNA, which also forms an Ј the miR-14 and bantam miRNAs found in Drosophila all RNA hairpin bearing a 2-nt 3 overhang. repress the expression of mRNAs bearing partially Several members of the karyopherin family of nucleo- complementary target sites (Ambros 2003). In C. el- cytoplasmic transport factors have been shown to play a egans, let-7 and lin-4 expression is developmentally role in the nuclear export of noncoding RNAs, including regulated, and loss of let-7 or lin-4 function results in tRNAs, snRNAs, and rRNAs (Lei and Silver 2002). A disruption of normal larval development due to the in- defining characteristic of karyopherins that function in appropriate expression of their mRNA targets (Lee et al. nuclear export is that nuclear cargo binding requires the 1993; Reinhart et al. 2000). Consistent with a similar GTP-bound form of the Ran GTPase, whereas cytoplas- role for miRNAs in vertebrate development, many mu- mic hydrolysis of Ran-GTP to Ran-GDP induces cargo rine miRNAs are also expressed in a developmentally release. The karyopherin Exportin-5 (Exp5; Brownawell regulated or tissue-specific manner (Lagos-Quintana et and Macara 2002) mediates the nuclear export of adeno- al. 2002; Houbaviy et al. 2003). virus VA1, a highly structured 160-nt noncoding RNA, The miRNAs are initially expressed as part of an im- and can also function as a secondary receptor for tRNA perfect RNA hairpin of ∼80 nt in length that in turn nuclear export (Gwizdek et al. 2003; Bohnsack et al. forms part of a longer initial transcript termed a primary 2002; Calado et al. 2002). In the case of VA1, Exp5 bind- miRNA (pri-miRNA; Lee et al. 2002). The first step in ing requires a terminal dsRNA “mini-helix” of >14 bp bearing a base-paired 5Ј end and a 3Ј extension of Ն3nt (Gwizdek et al. 2003). As these structural determinants [Keywords: MicroRNA; nuclear export; RNA interference; siRNA] 4 are shared with both pre-miRNAs and shRNAs, we Corresponding author. asked whether Exp5 might also be required for nuclear E-MAIL [email protected]; FAX (919) 681-8979. Article published online ahead of print. Article and publication date are export of these small noncoding RNAs. Here, we dem- at http://www.genesdev.org/cgi/doi/10.1101/gad.1158803. onstrate that Exp5 is indeed required for the nuclear ex- GENES & DEVELOPMENT 17:3011–3016 © 2003 by Cold Spring Harbor Laboratory Press ISSN 0890-9369/03 $5.00; www.genesdev.org 3011 Downloaded from genesdev.cshlp.org on October 5, 2021 - Published by Cold Spring Harbor Laboratory Press Yietal. port and, hence biological activity, of pre-miRNAs and shRNAs but not for synthetic siRNA function. More- over, we show that Exp5 binds the miR-30 pre-miRNA precursor specifically in vitro, but only in the presence of Ran-GTP. These results identify a major cellular export cargo for Exp5 and define a novel cofactor for miRNA biogenesis and function. Results and Discussion To test whether Exp5 is indeed involved in pre-miRNA nuclear export, we first identified a synthetic siRNA able to effectively knock-down Exp5 expression in human cells. An siRNA duplex targeted to residues 339–360 of the human Exp5 open reading frame (ORF) was trans- fected into 293T cells at time 0 and again 36 h and 60 h later. Exp5 gene expression was analyzed an additional 36 h later. As shown in Figure 1, this treatment dramati- cally and specifically reduced the endogenous level of expression of both Exp5 mRNA and protein. We previously described a firefly luciferase (luc)-based indicator plasmid, termed pCMV-luc-miR-30(P), that Figure 2. Loss of Exp5 expression specifically relieves inhibition of contains eight target sites for the human miR-30 miRNA gene expression caused by pre-miRNAs or shRNAs. (A) Schematic Ј representation of the pCMV-luc-miR-30(P) indicator plasmid, and of inserted into the 3 untranslated region (Fig. 2A; Zeng et the different miR-30 RNA variants used. (B) At 60 h, coincident al. 2003). As a result, luc expression from this plasmid is with the third siExp5 or mock transfection, 293T cells were cotrans- potently reduced by expression of miR-30. We also pre- fected with the pCMV-luc-miR-30(P) indicator plasmid, a Renilla viously described a plasmid, pCMV-miR-30, that ex- luciferase internal control plasmid, the indicated pBC12/CMV- or presses authentic human miR-30 as a long mRNA simi- pSuper-derived control or miRNA expression plasmids, or the syn- thetic miR-30(siRNA) RNA duplex. Firefly and Renilla luciferase lar to a pri-miRNA (Fig. 2A; Zeng et al. 2002). As in the expression levels were determined at 96 h and adjusted for minor case of endogenous miR-30, expression of miR-30 by variations in the Renilla internal control. Pos (Positive control) re- pCMV-miR-30 requires nuclear excision of the pre- fers to mock- or siExp5-transfected cultures that had been cotrans- miRNA intermediate, followed by nuclear export and fected with pCMV-luc-miR-30(P) and the Renilla and pBC12/CMV Dicer processing (Zeng and Cullen 2003). A second miR- control plasmids. Data are presented relative to the firefly luciferase 30 expression plasmid, termed pSuper-miR-30, uses the activity detected in the mock-transfected positive control culture, which was set at 100. Average of three experiments with standard pol III-dependent H1 promoter to express a 63-nt RNA deviation indicated. (C) These data were generated as described in hairpin that is identical to the authentic pre-miR-30 in- panel B except that the indicator plasmids pCMV-luc-miR-21(P) and termediate except that the 2-nt 3Ј overhang has been pCMV-luc-random were used. In addition, this panel used cells changed from 5Ј-GC-3Ј to 5Ј-UU-3Ј (Fig. 2A).
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