201
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Abstract
Alternative pre-mRNA splicing is a central mode of genetic regulation in higher eukaryotes. Variability in splicing patterns is a major source of protein diversity from the genome. In this review, I describe what is currently known of the molecular mechanisms that control changes in splice site choice. I start with the best-characterized systems from the Drosophila sex determination pathway, and then describe the regulators of other systems about whose mechanisms there is some data. How these regulators are combined into complex systems of tissue-specific splicing is discussed. In conclusion, very recent studies are presented that point to new directions for understanding alternative splicing and its mechanisms.
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Affiliation(s)
- Douglas L Black
- Department of Microbiology, Immunology, and Molecular Genetics, Howard Hughes Medical Institute, University of California-Los Angeles, Los Angeles, California 90095-1662, USA.
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202
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Mocellin S, Provenzano M, Lise M, Nitti D, Rossi CR. Increased TIA-1 gene expression in the tumor microenvironment after locoregional administration of tumor necrosis factor-alpha to patients with soft tissue limb sarcoma. Int J Cancer 2003; 107:317-22. [PMID: 12949814 DOI: 10.1002/ijc.11369] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Although it is known that TNF-alpha is effective in the treatment of advanced solid tumors such as melanoma and soft tissue sarcoma, the molecular mechanism underlying its anticancer activity remains unclear. Nineteen patients with locally advanced soft tissue sarcoma underwent isolated limb perfusion with doxorubicin alone (n = 9) or combined with TNF-alpha (n = 10). mRNA from posttreatment tumor biopsies was linearly amplified to create an RNA bank. The transcriptional levels of 22 genes were analyzed by qrt-PCR. On the basis of in vivo findings, we investigated the in vitro gene expression of different cell types representing the tumor microenvironment cell population. TIA-1, which encodes an RNA-binding protein with translation-regulatory functions, was the only gene differentially expressed between the 2 study groups, its transcriptional levels in tumor biopsies from patients receiving TNF-alpha being higher than in those from patients not given the cytokine. In vitro, TIA-1 was expressed by endothelial cells, fibroblasts, CTLs and NK cells. TNF-alpha significantly upregulated TIA-1 gene expression only in endothelial and NK cells. Furthermore, TIA-1 transcriptional levels significantly increased during NK activity, which was enhanced by TNF-alpha. These findings support the hypothesis that TNF-alpha-induced TIA-1 overexpression might sensitize endothelial cells to proapoptotic stimuli present in the tumor microenvironment and enhance NK cell cytotoxic activity against cancer cells.
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Affiliation(s)
- Simone Mocellin
- Surgery Branch, Department of Oncological and Surgical Sciences, University of Padua, Padua, Italy
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203
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Buu LM, Jang LT, Lee FJS. The yeast RNA-binding protein Rbp1p modifies the stability of mitochondrial porin mRNA. J Biol Chem 2003; 279:453-62. [PMID: 14570877 DOI: 10.1074/jbc.m309278200] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The Saccharomyces cerevisiae RNA-binding protein Rbp1p was initially identified as a negative growth regulator; however, its function is still obscure. Here, we show that Rbp1p in cells is associated with structures that sediment at 10,000 as well as 100,000 x g. It appears microscopically as punctate signals partially localized to the perinuclear region. Over-expression of Rbp1p in yeast resulted in growth defects on nonfermentable carbon sources, suggesting a function for Rbp1p in mitochondrial biogenesis. Absence of Rbp1p increased the level of mitochondrial porin, whereas over-expression of Rbp1p, but not an N-terminally truncated form, decreased porin levels. Over-expression of Rbp1p also decreased the level of mitochondrial porin mRNA by enhancing its degradation, an effect that was dependent on all three of the Rbp1p RNA recognition motifs. In cells, the porin mRNA is associated with Rbp1p.RNP (ribonucleoprotein) complexes. In vitro binding assays showed that Rbp1p most likely interacts with a (C/G)U-rich element in the porin mRNA 3'-UTR. Based on these observations, we infer that Rbp1p has a role in negatively regulating mitochondrial porin expression post-transcriptionally.
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Affiliation(s)
- Leh-Miauh Buu
- Institute of Molecular Medicine, College of Medicine, National Taiwan University Hospital, National Taiwan University, 7 Chung Shan South Road, Taipei 100, Taiwan
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204
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Penalva LOF, Sánchez L. RNA binding protein sex-lethal (Sxl) and control of Drosophila sex determination and dosage compensation. Microbiol Mol Biol Rev 2003; 67:343-59, table of contents. [PMID: 12966139 PMCID: PMC193869 DOI: 10.1128/mmbr.67.3.343-359.2003] [Citation(s) in RCA: 125] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In the past two decades, scientists have elucidated the molecular mechanisms behind Drosophila sex determination and dosage compensation. These two processes are controlled essentially by two different sets of genes, which have in common a master regulatory gene, Sex-lethal (Sxl). Sxl encodes one of the best-characterized members of the family of RNA binding proteins. The analysis of different mechanisms involved in the regulation of the three identified Sxl target genes (Sex-lethal itself, transformer, and male specific lethal-2) has contributed to a better understanding of translation repression, as well as constitutive and alternative splicing. Studies using the Drosophila system have identified the features of the protein that contribute to its target specificity and regulatory functions. In this article, we review the existing data concerning Sxl protein, its biological functions, and the regulation of its target genes.
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Affiliation(s)
- Luiz O F Penalva
- Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina 27710, USA.
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205
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Zhu H, Hasman RA, Young KM, Kedersha NL, Lou H. U1 snRNP-dependent function of TIAR in the regulation of alternative RNA processing of the human calcitonin/CGRP pre-mRNA. Mol Cell Biol 2003; 23:5959-71. [PMID: 12917321 PMCID: PMC180986 DOI: 10.1128/mcb.23.17.5959-5971.2003] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2002] [Revised: 03/06/2003] [Accepted: 06/10/2003] [Indexed: 12/24/2022] Open
Abstract
Alternative RNA processing of human calcitonin/CGRP pre-mRNA is regulated by an intronic enhancer element. Previous studies have demonstrated that multiple sequence motifs within the enhancer and a number of trans-acting factors play critical roles in the regulation. Here, we report the identification of TIAR as a novel player in the regulation of human calcitonin/CGRP alternative RNA processing. TIAR binds to the U tract sequence motif downstream of a pseudo 5' splice site within the previously characterized intron enhancer element. Binding of TIAR promotes inclusion of the alternative 3'-terminal exon located more than 200 nucleotides upstream from the U tract. In cells that preferentially include this exon, overexpression of a mutant TIAR that lacks the RNA binding domains suppressed inclusion of this exon. In this report, we also demonstrate an unusual novel interaction between U6 snRNA and the pseudo 5' splice site, which was shown previously to bind U1 snRNA. Interestingly, TIAR binding to the U tract sequence depends on the interaction of not only U1 but also U6 snRNA with the pseudo 5' splice site. Conversely, TIAR binding promotes U6 snRNA binding to its target. The synergistic relationship between TIAR and U6 snRNA strongly suggests a novel role of U6 snRNP in regulated alternative RNA processing.
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Affiliation(s)
- Hui Zhu
- Department of Genetics, School of Medicine, Case Western Reserve University, Ireland Cancer Center, University Hospitals of Cleveland, Cleveland, Ohio 44106, USA
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206
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Dixon DA, Balch GC, Kedersha N, Anderson P, Zimmerman GA, Beauchamp RD, Prescott SM. Regulation of cyclooxygenase-2 expression by the translational silencer TIA-1. J Exp Med 2003; 198:475-81. [PMID: 12885872 PMCID: PMC2194089 DOI: 10.1084/jem.20030616] [Citation(s) in RCA: 161] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The cyclooxygenase-2 (COX-2) enzyme catalyzes the rate-limiting step of prostaglandin formation in inflammatory states, and COX-2 overexpression plays a key role in carcinogenesis. To understand the mechanisms regulating COX-2 expression, we examined its posttranscriptional regulation mediated through the AU-rich element (ARE) within the COX-2 mRNA 3'-untranslated region (3'UTR). RNA binding studies, performed to identify ARE-binding regulatory factors, demonstrated binding of the translational repressor protein TIA-1 to COX-2 mRNA. The significance of TIA-1-mediated regulation of COX-2 expression was observed in TIA-1 null fibroblasts that produced significantly more COX-2 protein than wild-type fibroblasts. However, TIA-1 deficiency did not alter COX-2 transcription or mRNA turnover. Colon cancer cells demonstrated to overexpress COX-2 through increased polysome association with COX-2 mRNA also showed defective TIA-1 binding both in vitro and in vivo. These findings implicate that TIA-1 functions as a translational silencer of COX-2 expression and support the hypothesis that dysregulated RNA-binding of TIA-1 promotes COX-2 expression in neoplasia.
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Affiliation(s)
- Dan A Dixon
- Surgical Oncology Research Laboratory, Department of Surgery, Vanderbilt University Medical Center, Nashville, TN 37232-2733, USA.
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207
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Black DL, Grabowski PJ. Alternative pre-mRNA splicing and neuronal function. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2003; 31:187-216. [PMID: 12494767 DOI: 10.1007/978-3-662-09728-1_7] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- D L Black
- Howard Hughes Medical Institute, University of California, Los Angeles, MRL 5-748, 675 Charles E. Young Dr. South, Los Angeles, California 90095, USA
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208
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Wu JY, Tang H, Havlioglu N. Alternative pre-mRNA splicing and regulation of programmed cell death. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2003; 31:153-85. [PMID: 12494766 DOI: 10.1007/978-3-662-09728-1_6] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- J Y Wu
- Department of Pediatrics and Department of Molecular Biology and Pharmacology, MPRB Rm3107, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
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209
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Förch P, Valcárcel J. Splicing regulation in Drosophila sex determination. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2003; 31:127-51. [PMID: 12494765 DOI: 10.1007/978-3-662-09728-1_5] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- P Förch
- Gene Expression Programme, European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
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210
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Förch P, Merendino L, Martínez C, Valcárcel J. U2 small nuclear ribonucleoprotein particle (snRNP) auxiliary factor of 65 kDa, U2AF65, can promote U1 snRNP recruitment to 5' splice sites. Biochem J 2003; 372:235-40. [PMID: 12558503 PMCID: PMC1223361 DOI: 10.1042/bj20021202] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2002] [Revised: 01/06/2003] [Accepted: 01/31/2003] [Indexed: 02/02/2023]
Abstract
The splicing factor U2AF(65), U2 small nuclear ribonucleoprotein particle (snRNP) auxillary factor of 65 kDa, binds to pyrimidine-rich sequences at 3' splice sites to recruit U2 snRNP to pre-mRNAs. We report that U2AF(65) can also promote the recruitment of U1 snRNP to weak 5' splice sites that are followed by uridine-rich sequences. The arginine- and serine-rich domain of U2AF(65) is critical for U1 recruitment, and we discuss the role of its RNA-RNA annealing activity in this novel function of U2AF(65).
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Affiliation(s)
- Patrik Förch
- Gene Expression Programme, European Molecular Biology Laboratory, Meyerhofstrasse 1, D-69117 Heidelberg, Germany
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211
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Le Guiner C, Gesnel MC, Breathnach R. TIA-1 or TIAR is required for DT40 cell viability. J Biol Chem 2003; 278:10465-76. [PMID: 12533540 DOI: 10.1074/jbc.m212378200] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
TIA-1 and TIAR are a pair of related RNA-binding proteins which have been implicated in apoptosis. We show that chicken DT40 cells with both tia-1 alleles and one tiar allele disrupted (tia-1(-/-)tiar(-/+) cells) are viable. However, their growth and survival in medium containing low serum levels is significantly reduced compared with DT40 cells. The remaining intact tiar allele in tia-1(-/-)tiar(-/+) cells can only be disrupted if TIA-1 expression is first restored to the cells by transfection of a TIA-1 expression vector. We conclude that DT40 cells require either TIA-1 or TIAR for viability. TIA-1 overexpression in tia-1(-/-)tiar(-/+) cells leads to a radical drop in TIAR levels, by inducing efficient splicing of two tiar alternative exons carrying in-frame stop codons. In wild-type DT40 cells, tiar transcripts including these exons can also be detected. These transcripts increase significantly in abundance in cycloheximide-treated cells, suggesting that splicing of the exons exposes mRNAs to nonsense-mediated mRNA decay. TIA-1 or TIAR depletion leads to a marked drop in splicing of the exons. The human tiar gene contains a corresponding pair of TIA-1-inducible alternative exons, and we show that there is very high sequence conservation between chickens and humans of the exon pair and parts of the flanking introns. The TIA-1/TIAR responsiveness of these alternative tiar exons is likely to be of physiological importance for controlling TIAR levels.
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Affiliation(s)
- Caroline Le Guiner
- INSERM U463, Institut de Biologie-CHR, 9 Quai Moncousu, 44093 Nantes Cedex 1, France
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212
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Dirksen WP, Mohamed SA, Fisher SA. Splicing of a myosin phosphatase targeting subunit 1 alternative exon is regulated by intronic cis-elements and a novel bipartite exonic enhancer/silencer element. J Biol Chem 2003; 278:9722-32. [PMID: 12509424 DOI: 10.1074/jbc.m207969200] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Isoforms of the smooth muscle myosin phosphatase targeting subunit 1 (MYPT1) are generated by cassette-type alternative splicing of exons. Tissue-specific expression of these isoforms is thought to determine smooth muscle-relaxant properties and unique responses to signaling pathways. We used mini-gene deletion/mutation constructs to identify cis regulators of splicing of the chicken MYPT1 central alternative exon. Comparisons of alternative exon splicing were made between smooth muscle cells of the fast-phasic contractile phenotype (gizzard), in which the central alternative exon is skipped, and slow tonic contractile phenotype (aorta), in which the alternative exon is included. We demonstrate that splicing of the alternative exon requires a cis-enhancer complex in the vicinity of the alternative exon 5'-splice site. This complex consists of two UCUU motifs in an intronic U-rich sequence (putative PTB (polypyrimidine tract binding) or T cell inhibitor of apoptosis-1 binding sites), an intronic 67-nucleotide enhancer that has similarities with the cardiac Troponin T MSE3 enhancer, and a potentially novel exonic splicing enhancer. The exonic enhancer contains the palindromic sequence UCCUACAUCCU present in many other transcripts where alternative splicing of exons occurs, suggesting that it may be more broadly active. The exonic enhancer is adjacent to a potentially novel exonic silencer element that contains a 13-nucleotide imperfect palindromic sequence. This silencer, in conjunction with a distal intronic silencer, is proposed to mediate the silencing of splicing of the MYPT1 central alternative exon in the fast phasic smooth muscle phenotype.
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Affiliation(s)
- Wessel P Dirksen
- Department of Medicine (Cardiology), Case Western Reserve University School of Medicine, Cleveland, Ohio 44106-4958, USA
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213
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Danielli A, Kafatos FC, Loukeris TG. Cloning and characterization of four Anopheles gambiae serpin isoforms, differentially induced in the midgut by Plasmodium berghei invasion. J Biol Chem 2003; 278:4184-93. [PMID: 12456678 DOI: 10.1074/jbc.m208187200] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The genomic locus SRPN10 of the malaria vector Anopheles gambiae codes for four alternatively spliced serine protease inhibitors of the serpin superfamily. The four 40- to 42-kDa isoforms differ only at their C terminus, which bears the reactive site loop, and exhibit protein sequence similarity with other insect serpins and mammalian serpins of the ovalbumin family. Inhibition experiments with recombinant purified SRPN10 serpins reveal distinct and specific inhibitory activity of three isoforms toward different proteases. All isoforms are mainly expressed in the midgut but also in pericardial cells and hemocytes of the mosquito. The cellular localization of SRPN10 serpins is nucleocytoplasmic in pericardial cells, in hemocytes and in a hemocyte-like mosquito cell line, but in the gut the proteins are mostly localized in the nucleus. Although the transcript levels of all SRPN10 isoforms are marginally affected by bacterial challenge, the transcripts of two isoforms (KRAL and RCM) are induced in female mosquitoes in response to midgut invasion by Plasmodium berghei ookinetes. The KRAL and RCM SRPN10 isoforms represent new potential markers to study the ookinete midgut invasion process in anopheline mosquitoes.
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Affiliation(s)
- Alberto Danielli
- European Molecular Biology Laboratory, Meyerhofstrasse 1, Heidelberg 69117, Germany
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214
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Muh SJ, Hovhannisyan RH, Carstens RP. A Non-sequence-specific double-stranded RNA structural element regulates splicing of two mutually exclusive exons of fibroblast growth factor receptor 2 (FGFR2). J Biol Chem 2002; 277:50143-54. [PMID: 12393912 DOI: 10.1074/jbc.m207409200] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Alternative splicing of fibroblast growth factor receptor 2 (FGFR2) mutually exclusive exons IIIb and IIIc represents a tightly regulated and functionally relevant example of post-transcriptional gene regulation. Rat prostate cancer DT3 and AT3 cell lines demonstrate exclusive selection of either exon IIIb or exon IIIc, respectively, and have been used to characterize regulatory FGFR2 RNA cis-elements that are required for splicing regulation. Two sequences termed ISE-2 and ISAR are located in the intron between exons IIIb and IIIc and are required for cell-type specific exon IIIb. Previous studies suggest that the function of these elements involves formation of an RNA stem structure, even though they are separated by more than 700 nucleotides. Using transfected minigenes, we performed a systematic analysis of the sequence and structural components of ISE-2 and ISAR that are required for their ability to regulate FGFR2 splicing. We found that the primary sequence of these elements can be replaced by completely unrelated sequences, provided that they are also predicted to form an RNA stem structure. Thus, a nonsequence-specific double stranded RNA stem constitutes a functional element required for FGFR2 splicing; suggesting that a double-stranded RNA binding protein is a component of the splicing regulatory machinery.
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MESH Headings
- Alternative Splicing
- Animals
- Base Sequence
- Cells, Cultured
- Conserved Sequence
- Exons
- Gene Expression Regulation
- Humans
- Introns
- Mice
- Models, Biological
- Models, Genetic
- Molecular Sequence Data
- Mutation
- Nucleic Acid Conformation
- Plasmids/metabolism
- RNA/metabolism
- RNA Splicing
- RNA, Double-Stranded/chemistry
- Rats
- Receptor Protein-Tyrosine Kinases/biosynthesis
- Receptor Protein-Tyrosine Kinases/genetics
- Receptor, Fibroblast Growth Factor, Type 1
- Receptor, Fibroblast Growth Factor, Type 2
- Receptors, Fibroblast Growth Factor/biosynthesis
- Receptors, Fibroblast Growth Factor/genetics
- Reverse Transcriptase Polymerase Chain Reaction
- Transfection
- Tumor Cells, Cultured
- Xenopus
- Xenopus Proteins
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Affiliation(s)
- Stephanie J Muh
- Renal-Electrolyte and Hypertension Division, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6144, USA
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215
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Förch P, Puig O, Martínez C, Séraphin B, Valcárcel J. The splicing regulator TIA-1 interacts with U1-C to promote U1 snRNP recruitment to 5' splice sites. EMBO J 2002; 21:6882-92. [PMID: 12486009 PMCID: PMC139089 DOI: 10.1093/emboj/cdf668] [Citation(s) in RCA: 185] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2002] [Revised: 10/17/2002] [Accepted: 10/22/2002] [Indexed: 11/12/2022] Open
Abstract
The U1 small nuclear ribonucleoprotein (U1 snRNP) binds to the pre-mRNA 5' splice site (ss) at early stages of spliceosome assembly. Recruitment of U1 to a class of weak 5' ss is promoted by binding of the protein TIA-1 to uridine-rich sequences immediately downstream from the 5' ss. Here we describe a molecular dissection of the activities of TIA-1. RNA recognition motifs (RRMs) 2 and 3 are necessary and sufficient for binding to the pre-mRNA. The non- consensus RRM1 and the C-terminal glutamine-rich (Q) domain are required for association with U1 snRNP and to facilitate its recruitment to 5' ss. Co-precipitation experiments revealed a specific and direct interaction involving the N-terminal region of the U1 protein U1-C and the Q-rich domain of TIA-1, an interaction enhanced by RRM1. The results argue that binding of TIA-1 in the vicinity of a 5' ss helps to stabilize U1 snRNP recruitment, at least in part, via a direct interaction with U1-C, thus providing one molecular mechanism for the function of this splicing regulator.
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Affiliation(s)
| | - Oscar Puig
- Gene Expression Programme, European Molecular Biology Laboratory, Meyerhofstrasse 1, D-69117 Heidelberg, Germany
Present address: Molecular and Cell Biology Department, University of California at Berkeley, Berkeley, CA, USA Present address: Centre de Regulació Genòmica, Passeig Marítim 37–49, 08003 Barcelona, Spain Present address: CGM-CNRS, Gif sur Yvette, France Corresponding author e-mail:
| | - Concepción Martínez
- Gene Expression Programme, European Molecular Biology Laboratory, Meyerhofstrasse 1, D-69117 Heidelberg, Germany
Present address: Molecular and Cell Biology Department, University of California at Berkeley, Berkeley, CA, USA Present address: Centre de Regulació Genòmica, Passeig Marítim 37–49, 08003 Barcelona, Spain Present address: CGM-CNRS, Gif sur Yvette, France Corresponding author e-mail:
| | - Bertrand Séraphin
- Gene Expression Programme, European Molecular Biology Laboratory, Meyerhofstrasse 1, D-69117 Heidelberg, Germany
Present address: Molecular and Cell Biology Department, University of California at Berkeley, Berkeley, CA, USA Present address: Centre de Regulació Genòmica, Passeig Marítim 37–49, 08003 Barcelona, Spain Present address: CGM-CNRS, Gif sur Yvette, France Corresponding author e-mail:
| | - Juan Valcárcel
- Gene Expression Programme, European Molecular Biology Laboratory, Meyerhofstrasse 1, D-69117 Heidelberg, Germany
Present address: Molecular and Cell Biology Department, University of California at Berkeley, Berkeley, CA, USA Present address: Centre de Regulació Genòmica, Passeig Marítim 37–49, 08003 Barcelona, Spain Present address: CGM-CNRS, Gif sur Yvette, France Corresponding author e-mail:
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216
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Iseni F, Garcin D, Nishio M, Kedersha N, Anderson P, Kolakofsky D. Sendai virus trailer RNA binds TIAR, a cellular protein involved in virus-induced apoptosis. EMBO J 2002; 21:5141-50. [PMID: 12356730 PMCID: PMC129035 DOI: 10.1093/emboj/cdf513] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Sendai virus (SeV) leader (le) and trailer (tr) RNAs are short transcripts generated during abortive antigenome and genome synthesis, respectively. Recom binant SeV (rSeV) that express tr-like RNAs from the leader region are non-cytopathic and, moreover, prevent wild-type SeV from inducing apoptosis in mixed infections. These rSeV thus appear to have gained a function. Here we report that tr RNA binds to a cellular protein with many links to apoptosis (TIAR) via the AU-rich sequence 5' UUUUAAAUUUU. Duplication of this AU-rich sequence alone within the le RNA confers TIAR binding on this le* RNA and a non-cytopathic phenotype to these rSeV in cell culture. Transgenic overexpression of TIAR during SeV infection promotes apoptosis and reverses the anti-apoptotic effects of le* RNA expression. More over, TIAR overexpression and SeV infection act synergistically to induce apoptosis. These short viral RNAs may act by sequestering TIAR, a multivalent RNA recognition motif (RRM) family RNA-binding protein involved in SeV-induced apoptosis. In this view, tr RNA is not simply a by-product of abortive genome synthesis, but is also an antigenome transcript that modulates the cellular antiviral response.
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Affiliation(s)
| | | | | | - Nancy Kedersha
- Department of Genetics and Microbiology, University of Geneva School of Medicine CMU, 9 Avenue de Champel, CH-1211 Geneva, Switzerland and
Division of Rheumatology and Immunology, Brigham and Women’s Hospital, Harvard Medical School, One Jimmy Fund Way, Boston, MA 02115, USA Corresponding author e-mail:
| | - Paul Anderson
- Department of Genetics and Microbiology, University of Geneva School of Medicine CMU, 9 Avenue de Champel, CH-1211 Geneva, Switzerland and
Division of Rheumatology and Immunology, Brigham and Women’s Hospital, Harvard Medical School, One Jimmy Fund Way, Boston, MA 02115, USA Corresponding author e-mail:
| | - Daniel Kolakofsky
- Department of Genetics and Microbiology, University of Geneva School of Medicine CMU, 9 Avenue de Champel, CH-1211 Geneva, Switzerland and
Division of Rheumatology and Immunology, Brigham and Women’s Hospital, Harvard Medical School, One Jimmy Fund Way, Boston, MA 02115, USA Corresponding author e-mail:
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217
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Abstract
Stress granules (SGs) are phase-dense particles that appear in the cytoplasm of eukaryotic cells that have been exposed to environmental stress(e.g. heat, oxidative conditions, hyperosmolarity and UV irradiation). SG assembly is a consequence of abortive translational initiation: SGs appear when translation is initiated in the absence of eIF2-GTP-tRNAiMet, the ternary complex that normally loads tRNAiMet onto the small ribosomal subunit. Stress-induced depletion of eIF2-GTP-tRNAiMet allows the related RNA-binding proteins TIA-1 and TIAR to promote the assembly of eIF2-eIF5-deficient preinitiation complexes, the core constituents of SGs. The mRNP components that make up the SG are in a dynamic equilibrium with polysomes. As such, the SG appears to constitute a metabolic domain through which mRNPs are continually routed and subjected to triage — they are first monitored for integrity and composition, and then sorted for productive translational initiation or targeted degradation.
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Affiliation(s)
- Paul Anderson
- Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Smith 652, One Jimmy Fund Way, Boston, MA 02115, USA.
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218
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Liu ZR. p68 RNA helicase is an essential human splicing factor that acts at the U1 snRNA-5' splice site duplex. Mol Cell Biol 2002; 22:5443-50. [PMID: 12101238 PMCID: PMC133941 DOI: 10.1128/mcb.22.15.5443-5450.2002] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Modulation of the interaction between U1 snRNP and the 5' splice site (5'ss) is a key event that governs 5'ss recognition and spliceosome assembly. Using the methylene blue-mediated cross-linking method (Z. R. Liu, A. M. Wilkie, M. J. Clemens, and C. W. Smith, RNA 2:611-621, 1996), a 65-kDa protein (p65) was shown to interact with the U1-5'ss duplex during spliceosome assembly (Z. R. Liu, B. Sargueil, and C. W. Smith, Mol. Cell. Biol. 18:6910-6920, 1998). In this report, p65 was identified as p68 RNA helicase and shown to be essential for in vitro pre-mRNA splicing. Depletion of endogenous p68 RNA helicase does not affect the loading of the U1 snRNP to the 5'ss during early stage of splicing. However, dissociation of the U1 from the 5'ss is largely inhibited. The data suggest that p68 RNA helicase functions in destabilizing the U1-5'ss interactions. Furthermore, depletion of p68 RNA helicase arrested spliceosome assembly at the prespliceosome stage, suggesting that p68 may play a role in the transition from prespliceosome to spliceosome.
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Affiliation(s)
- Zhi-Ren Liu
- Program in Cell & Molecular Biosciences, Department of Animal Sciences, Auburn University, 210 Upchurch Hall, Auburn, AL 36849, USA.
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219
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Lambermon MHL, Fu Y, Wieczorek Kirk DA, Dupasquier M, Filipowicz W, Lorković ZJ. UBA1 and UBA2, two proteins that interact with UBP1, a multifunctional effector of pre-mRNA maturation in plants. Mol Cell Biol 2002; 22:4346-57. [PMID: 12024044 PMCID: PMC133861 DOI: 10.1128/mcb.22.12.4346-4357.2002] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Nicotiana plumbaginifolia UBP1 is an hnRNP-like protein associated with the poly(A)(+) RNA in the cell nucleus. Consistent with a role in pre-mRNA processing, overexpression of UBP1 in N. plumabaginifolia protoplasts enhances the splicing of suboptimal introns and increases the steady-state levels of reporter mRNAs, even intronless ones. The latter effect of UBP1 is promoter specific and appears to be due to UBP1 binding to the 3' untranslated region (3'-UTR) and protecting the mRNA from exonucleolytic degradation (M. H. L. Lambermon, G. G. Simpson, D. A. Kirk, M. Hemmings-Mieszczak, U. Klahre, and W. Filipowicz, EMBO J. 19:1638-1649, 2000). To gain more insight into UBP1 function in pre-mRNA maturation, we characterized proteins interacting with N. plumbaginifolia UBP1 and one of its Arabidopsis thaliana counterparts, AtUBP1b, by using yeast two-hybrid screens and in vitro pull-down assays. Two proteins, UBP1-associated proteins 1a and 2a (UBA1a and UBA2a, respectively), were identified in A. thaliana. They are members of two novel families of plant-specific proteins containing RNA recognition motif-type RNA-binding domains. UBA1a and UBA2a are nuclear proteins, and their recombinant forms bind RNA with a specificity for oligouridylates in vitro. As with UBP1, transient overexpression of UBA1a in protoplasts increases the steady-state levels of reporter mRNAs in a promoter-dependent manner. Similarly, overexpression of UBA2a increases the levels of reporter mRNAs, but this effect is promoter independent. Unlike UBP1, neither UBA1a nor UBA2a stimulates pre-mRNA splicing. These and other data suggest that UBP1, UBA1a, and UBA2a may act as components of a complex recognizing U-rich sequences in plant 3'-UTRs and contributing to the stabilization of mRNAs in the nucleus.
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Affiliation(s)
- Mark H L Lambermon
- Friedrich Miescher Institute for Biomedical Research, 4002 Basel, Switzerland
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220
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Libri D, Duconge F, Levy L, Vinauger M. A role for the Psi-U mismatch in the recognition of the 5' splice site of yeast introns by the U1 small nuclear ribonucleoprotein particle. J Biol Chem 2002; 277:18173-81. [PMID: 11877437 DOI: 10.1074/jbc.m112460200] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The U1 small nuclear ribonucleoprotein particle (snRNP)/5' splice site (5'SS) interaction in yeast is essential for the splicing process and depends on the formation of a short RNA duplex between the 5' arm of U1 snRNA and the 1st intronic nucleotides. This RNA/RNA interaction is characterized by the presence of a mismatch that occurs with almost all yeast introns and concerns nucleotides 4 on the pre-mRNA (a U) and 5 on U1 snRNA (a Psi). The latter nucleotide is well conserved from yeast to vertebrates, but its role in yeast and the significance of the associated mismatch in the U1 snRNA/5'SS interaction have never been fully explained. We report here that the presence of this mismatch is a determinant of stability that mainly affects the off rate of the interaction. To our knowledge this is the first report assigning a function to this noncanonical interaction. We also performed SELEX (systematic evolution of ligands by exponential enrichment) experiments by immunoprecipitating U1 snRNP and the associated RNA. The artificial phylogeny derived from these experiments allows the isolation of the selective pressure due to U1 snRNP binding on the 5'SS of yeast introns.
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Affiliation(s)
- Domenico Libri
- Centre de Génétique Moléculaire, CNRS, 91190 Gif sur Yvette, France.
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221
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Expert-Bezançon A, Le Caer JP, Marie J. Heterogeneous nuclear ribonucleoprotein (hnRNP) K is a component of an intronic splicing enhancer complex that activates the splicing of the alternative exon 6A from chicken beta-tropomyosin pre-mRNA. J Biol Chem 2002; 277:16614-23. [PMID: 11867641 DOI: 10.1074/jbc.m201083200] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Splicing of the chicken beta-tropomyosin exon 6A is stimulated, both in vivo and in vitro, by an intronic pyrimidine-rich element (S4) located 37 nucleotides downstream of exon 6A. Several pyrimidine-rich sequences are able to substitute for the natural S4 enhancer with various stimulatory effects. We show that the different enhancer sequences recruit U1 small nuclear ribonucleoprotein (SnRNP) to the exon 6A 5' splice site, with an efficiency that correlates with the splicing activation. By using RNA affinity and two-dimensional gel electrophoresis, we characterized several proteins that bind to the different enhancer sequences. Heterogeneous nuclear ribonucleoprotein (hnRNP) K and hnRNP I (polypyrimidine track-binding protein, PTB) exhibit a higher level of interaction with the strong enhancer sequences (S4) than with the weakest enhancers. Functional analysis shows that hnRNP K is a component of the enhancer complex that promotes exon 6A splicing through the wild-type S4 sequence. The addition of recombinant hnRNP K to nuclear extracts preincubated with poly(rC) RNA competitor completely restores splicing efficiency to the original level. hnRNP I (PTB) was also found associated with the strong enhancer sequences. Its function in the splicing of exon 6A is discussed.
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222
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Anderson P, Kedersha N. Visibly stressed: the role of eIF2, TIA-1, and stress granules in protein translation. Cell Stress Chaperones 2002; 7:213-21. [PMID: 12380690 PMCID: PMC514820 DOI: 10.1379/1466-1268(2002)007<0213:vstroe>2.0.co;2] [Citation(s) in RCA: 215] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Eukaryotic cells express a family of eukaryotic translation initiation factor 2 alpha (eIF2alpha) kinases (eg, PKR, PERK-PEK, GCN2, HRI) that are individually activated in response to distinct types of environmental stress. Phosphorylation of eIF2alpha by one or more of these kinases reduces the concentration of eIF2-guanosine triphosphate (GTP)-transfer ribonucleic acid for methionine (tRNA(Met)), the ternary complex that loads tRNA(Met) onto the small ribosomal subunit to initiate protein translation. When ternary complex levels are reduced, the related RNA-binding proteins TIA-1 and TIAR promote the assembly of a noncanonical preinitiation complex that lacks eIF2-GTP-tRNA(Met). The TIA proteins dynamically sort these translationally incompetent preinitiation complexes into discrete cytoplasmic domains known as stress granules (SGs). RNA-binding proteins that stabilize or destabilize messenger RNA (mRNA) are also recruited to SGs during stress. Thus, TIA-1 and TIAR act downstream of eIF2alpha phosphorylation to promote SG assembly and facilitate mRNA triage during stress. The role of the SG in the integration of translational efficiency, mRNA stability, and the stress response is discussed.
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Affiliation(s)
- Paul Anderson
- Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, MA 02115, USA.
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223
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Lorković ZJ, Barta A. Genome analysis: RNA recognition motif (RRM) and K homology (KH) domain RNA-binding proteins from the flowering plant Arabidopsis thaliana. Nucleic Acids Res 2002; 30:623-35. [PMID: 11809873 PMCID: PMC100298 DOI: 10.1093/nar/30.3.623] [Citation(s) in RCA: 291] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2001] [Revised: 10/18/2001] [Accepted: 11/27/2001] [Indexed: 11/13/2022] Open
Abstract
Regulation of gene expression at the post-transcriptional level is mainly achieved by proteins containing well-defined sequence motifs involved in RNA binding. The most widely spread motifs are the RNA recognition motif (RRM) and the K homology (KH) domain. In this article, we survey the complete Arabidopsis thaliana genome for proteins containing RRM and KH RNA-binding domains. The Arabidopsis genome encodes 196 RRM-containing proteins, a more complex set than found in Caenorhabditis elegans and Drosophila melanogaster. In addition, the Arabidopsis genome contains 26 KH domain proteins. Most of the Arabidopsis RRM-containing proteins can be classified into structural and/or functional groups, based on similarity with either known metazoan or Arabidopsis proteins. Approximately 50% of Arabidopsis RRM-containing proteins do not have obvious homologues in metazoa, and for most of those that are predicted to be orthologues of metazoan proteins, no experimental data exist to confirm this. Additionally, the function of most Arabidopsis RRM proteins and of all KH proteins is unknown. Based on the data presented here, it is evident that among all eukaryotes, only those RNA-binding proteins that are involved in the most essential processes of post-transcriptional gene regulation are preserved in structure and, most probably, in function. However, the higher complexity of RNA-binding proteins in Arabidopsis, as evident in groups of SR splicing factors and poly(A)-binding proteins, may account for the observed differences in mRNA maturation between plants and metazoa. This survey provides a first systematic analysis of plant RNA-binding proteins, which may serve as a basis for functional characterisation of this important protein group in plants.
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Affiliation(s)
- Zdravko J Lorković
- Institute of Medical Biochemistry, Vienna University, Dr. Bohrgasse 9/3, 1030 Vienna, Austria.
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224
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Kedersha N, Chen S, Gilks N, Li W, Miller IJ, Stahl J, Anderson P. Evidence that ternary complex (eIF2-GTP-tRNA(i)(Met))-deficient preinitiation complexes are core constituents of mammalian stress granules. Mol Biol Cell 2002; 13:195-210. [PMID: 11809833 PMCID: PMC65082 DOI: 10.1091/mbc.01-05-0221] [Citation(s) in RCA: 473] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Environmental stress-induced phosphorylation of eIF2alpha inhibits protein translation by reducing the availability of eIF2-GTP-tRNA(i)Met, the ternary complex that joins initiator tRNA(Met) to the 43S preinitiation complex. The resulting untranslated mRNA is dynamically routed to discrete cytoplasmic foci known as stress granules (SGs), a process requiring the related RNA-binding proteins TIA-1 and TIAR. SGs appear to be in equilibrium with polysomes, but the nature of this relationship is obscure. We now show that most components of the 48S preinitiation complex (i.e., small, but not large, ribosomal subunits, eIF3, eIF4E, eIF4G) are coordinately recruited to SGs in arsenite-stressed cells. In contrast, eIF2 is not a component of newly assembled SGs. Cells expressing a phosphomimetic mutant (S51D) of eIF2alpha assemble SGs of similar composition, confirming that the recruitment of these factors is a direct consequence of blocked translational initiation and not due to other effects of arsenite. Surprisingly, phospho-eIF2alpha is recruited to SGs that are disassembling in cells recovering from arsenite-induced stress. We discuss these results in the context of a translational checkpoint model wherein TIA and eIF2 are functional antagonists of translational initiation, and in which lack of ternary complex drives SG assembly.
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MESH Headings
- Animals
- Arsenites/pharmacology
- COS Cells
- Centrifugation, Density Gradient
- Chlorocebus aethiops
- Cytoplasmic Granules/chemistry
- Cytoplasmic Granules/drug effects
- Cytoplasmic Granules/metabolism
- Eukaryotic Initiation Factor-2/analysis
- Eukaryotic Initiation Factor-2/genetics
- Eukaryotic Initiation Factor-2/metabolism
- Guanosine Triphosphate/analysis
- Humans
- Macromolecular Substances
- Male
- Microscopy, Fluorescence
- Peptide Chain Initiation, Translational
- Peptide Initiation Factors/analysis
- Peptide Initiation Factors/metabolism
- Phosphorylation
- RNA, Messenger/metabolism
- RNA, Ribosomal/metabolism
- RNA, Transfer, Met/analysis
- RNA, Transfer, Met/genetics
- RNA-Binding Proteins/metabolism
- Transfection
- Tumor Cells, Cultured
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Affiliation(s)
- Nancy Kedersha
- Division of Rheumatology and Immunology, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA
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225
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Labourier E, Blanchette M, Feiger JW, Adams MD, Rio DC. The KH-type RNA-binding protein PSI is required for Drosophila viability, male fertility, and cellular mRNA processing. Genes Dev 2002; 16:72-84. [PMID: 11782446 PMCID: PMC155316 DOI: 10.1101/gad.948602] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Direct interactions between RNA-binding proteins and snRNP particles modulate eukaryotic pre-mRNA processing patterns to control gene expression. Here, we report that the conserved U1 snRNP-interacting RNA-binding protein PSI is essential for Drosophila viability. A null PSI mutation is recessive lethal at the first-instar larval stage, and lethality is fully rescued by transgenes expressing the PSI protein. A mutant transgene that lacks the PSI-U1 snRNP-interaction domain restores viability but shows courtship behavior abnormalities and meiosis defects during spermatogenesis, resulting in a complete male sterility phenotype. Using cDNA microarrays, we have identified specific target mRNAs with altered expression profiles in these mutant males. A subset of these transcripts is also found associated with PSI in endogenous immunopurified ribonucleoprotein complexes. One specific target, the hrp40/squid transcript, shows an altered pre-mRNA splicing pattern in PSI mutant testes. We conclude that a functional association between the PSI protein and the spliceosomal U1 snRNP particle is required for normal Drosophila development and for the processing of specific PSI-interacting cellular transcripts. These results also validate the use of cDNA microarrays to characterize in vivo RNA-processing defects and alternative pre-mRNA splicing patterns.
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Affiliation(s)
- Emmanuel Labourier
- Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA
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226
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Le Guiner C, Plet A, Galiana D, Gesnel MC, Del Gatto-Konczak F, Breathnach R. Polypyrimidine tract-binding protein represses splicing of a fibroblast growth factor receptor-2 gene alternative exon through exon sequences. J Biol Chem 2001; 276:43677-87. [PMID: 11557769 DOI: 10.1074/jbc.m107381200] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The fibroblast growth factor receptor (FGFR)-2 gene contains two mutually exclusive exons, K-SAM and BEK. We made a cell line designed to become drug-resistant on repression of BEK exon splicing. One drug-resistant derivative of this line carried an insertion within the BEK exon of a sequence containing at least two independent splicing silencers. One silencer was a pyrimidine-rich sequence, which markedly increased binding of polypyrimidine tract-binding protein to the BEK exon. The BEK exon binds to polypyrimidine tract-binding protein even in the silencer's absence. Several exonic pyrimidine runs are required for this binding, and they are also required for overexpression of polypyrimidine tract-binding protein to repress BEK exon splicing. These results show that binding of polypyrimidine tract-binding protein to exon sequences can repress splicing. In epithelial cells, the K-SAM exon is spliced in preference to the BEK exon, whose splicing is repressed. Mutation of the BEK exon pyrimidine runs decreases this repression. If this mutation is combined with the deletion of a sequence in the intron upstream from the BEK exon, a complete switch from K-SAM to BEK exon splicing ensues. Binding of polypyrimidine tract binding protein to the BEK exon thus participates in the K-SAM/BEK alternative splicing choice.
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Affiliation(s)
- C Le Guiner
- INSERM U463, Institut de Biologie-CHR, 9 Quai Moncousu, 44093 Nantes Cedex 1, France
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227
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Le Guiner C, Lejeune F, Galiana D, Kister L, Breathnach R, Stévenin J, Del Gatto-Konczak F. TIA-1 and TIAR activate splicing of alternative exons with weak 5' splice sites followed by a U-rich stretch on their own pre-mRNAs. J Biol Chem 2001; 276:40638-46. [PMID: 11514562 DOI: 10.1074/jbc.m105642200] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
TIA-1 has recently been shown to activate splicing of specific pre-mRNAs transcribed from transiently transfected minigenes, and of some 5' splice sites in vitro, but has not been shown to activate splicing of any endogenous pre-mRNA. We show here that overexpression of TIA-1 or the related protein TIAR has little effect on splicing of several endogenous pre-mRNAs containing alternative exons, but markedly activates splicing of some normally rarely used alternative exons on the TIA-1 and TIAR pre-mRNAs. These exons have weak 5' splice sites followed by U-rich stretches. When the U-rich stretch following the 5' splice site of a TIA-1 alternative exon was deleted, TIAR overexpression induced use of a cryptic 5' splice site also followed by a U-rich stretch in place of the original splice site. Using in vitro splicing assays, we have shown that TIA-1 is directly involved in activating the 5' splice sites of the TIAR alternative exons. Activation requires a downstream U-rich stretch of at least 10 residues. Our results confirm that TIA-1 activates 5' splice sites followed by U-rich sequences and show that TIAR exerts a similar activity. They suggest that both proteins may autoregulate their expression at the level of splicing.
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Affiliation(s)
- C Le Guiner
- INSERM U463, Institut de Biologie-CHR, 9 Quai Moncousu, 44093 Nantes Cedex 1, France
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228
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Goldstrohm AC, Greenleaf AL, Garcia-Blanco MA. Co-transcriptional splicing of pre-messenger RNAs: considerations for the mechanism of alternative splicing. Gene 2001; 277:31-47. [PMID: 11602343 DOI: 10.1016/s0378-1119(01)00695-3] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Nascent transcripts are the true substrates for many splicing events in mammalian cells. In this review we discuss transcription, splicing, and alternative splicing in the context of co-transcriptional processing of pre-mRNA. The realization that splicing occurs co-transcriptionally requires two important considerations: First, the cis-acting elements in the splicing substrate are synthesized at different times in a 5' to 3' direction. This dynamic view of the substrate implies that in a 100 kb intron the 5' splice site will be synthesized as much as an hour before the 3' splice site. Second, the transcription machinery and the splicing machinery, which are both complex and very large, are working in close proximity to each other. It is therefore likely that these two macromolecular machines interact, and recent data supporting this notion is discussed. We propose a model for co-transcriptional pre-mRNA processing that incorporates the concepts of splice site-tethering and dynamic exon definition. Also, we present a dynamic view of the alternative splicing of FGF-R2 and suggest that this view could be generally applicable to many regulated splicing events.
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Affiliation(s)
- A C Goldstrohm
- Department of Genetics, Duke University Medical Center, Durham, NC 27710, USA
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229
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Abstract
Tissue-specific alternative splicing profoundly effects animal physiology, development and disease, and this is nowhere more evident than in the nervous system. Alternative splicing is a versatile form of genetic control whereby a common pre-mRNA is processed into multiple mRNA isoforms differing in their precise combination of exon sequences. In the nervous system, thousands of alternatively spliced mRNAs are translated into their protein counterparts where specific isoforms play roles in learning and memory, neuronal cell recognition, neurotransmission, ion channel function, and receptor specificity. The essential nature of this process is underscored by the finding that its misregulation is a common characteristic of human disease. This review highlights the current views of the biological phenomenon of alternative splicing, and describes evidence for its intricate underlying biochemical mechanisms. The roles of RNA binding proteins and their tissue-specific properties are discussed. Why does alternative splicing occur in cosmic proportions in the nervous system? How does it affect integrated cellular functions? How are region-specific, cell-specific and developmental differences in splicing directed? How are the control mechanisms that operate in the nervous system distinct from those of other tissues? Although there are many unanswered questions, substantial progress has been made in showing that alternative splicing is of major importance in generating proteomic diversity, and in modulating protein activities in a temporal and spatial manner. The relevance of alternative splicing to diseases of the nervous system is also discussed.
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Affiliation(s)
- P J Grabowski
- Department of Biological Sciences, Howard Hughes Medical Institute, A507LH, University of Pittsburgh, 4249 Fifth Avenue, Pittsburgh, PA 15260, USA.
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230
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Abstract
Significant advances have been made in elucidating the biogenesis pathway and three-dimensional structure of the UsnRNPs, the building blocks of the spliceosome. U2 and U4/U6*U5 tri-snRNPs functionally associate with the pre-mRNA at an earlier stage of spliceosome assembly than previously thought, and additional evidence supporting UsnRNA-mediated catalysis of pre-mRNA splicing has been presented.
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MESH Headings
- Animals
- Crystallography
- Humans
- Macromolecular Substances
- Protein Structure, Tertiary/physiology
- Protein Transport/physiology
- RNA Splicing/genetics
- RNA Splicing/physiology
- RNA, Small Nuclear/chemistry
- RNA, Small Nuclear/genetics
- RNA, Small Nuclear/metabolism
- Ribonucleoprotein, U1 Small Nuclear/biosynthesis
- Ribonucleoprotein, U1 Small Nuclear/chemistry
- Ribonucleoprotein, U1 Small Nuclear/genetics
- Ribonucleoproteins, Small Nuclear/biosynthesis
- Ribonucleoproteins, Small Nuclear/chemistry
- Ribonucleoproteins, Small Nuclear/genetics
- Spliceosomes/chemistry
- Spliceosomes/genetics
- Spliceosomes/metabolism
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Affiliation(s)
- C L Will
- Max Planck Institute of Biophysical Chemistry, Department of Cellular Biochemistry, Am Fassberg 11, 37077 Göttingen, Germany.
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231
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Abstract
The past year has witnessed refinements in models of spliceosome assembly pathways and in the understanding of how splicing factors of the serine/arginine-rich (SR) protein family function. The role of splicing in human genetic diseases has also received a lot of attention recently as exonic splicing enhancers become better understood.
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Affiliation(s)
- M L Hastings
- Cold Spring Harbor Laboratory, 1 Bungtown Road, PO Box 100, Cold Spring Harbor, NY 11724-2208, USA
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232
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Affiliation(s)
- D Tollervey
- Wellcome Trust Centre for Cell Biology ICMB University of Edinburgh King's Buildings EH9 3JR Scotland, Edinburgh, United Kingdom.
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