A vertebrate RNA‐binding protein Fox‐1 regulates tissue‐specific splicing via the pentanucleotide GCAUG

Alternative splicing is one of the central mechanisms that regulate eukaryotic gene expression. Here we report a tissue‐specific RNA‐binding protein, Fox‐1, which regulates alternative splicing in vertebrates. Fox‐1 bound specifically to a pentanucleotide GCAUG in vitro. In zebrafish and mouse, fox‐1 is expressed in heart and skeletal muscles. As candidates for muscle‐specific targets of Fox‐1, we considered two genes, the human mitochondrial ATP synthase γ‐subunit gene (F1γ) and the rat α‐actinin gene, because their primary transcripts contain several copies of GCAUG. In transfection experiments, Fox‐1 induced muscle‐specific exon skipping of the F1γ gene via binding to GCAUG sequences upstream of the regulated exon. Fox‐1 also regulated mutually exclusive splicing of the α‐actinin gene, antagonizing the repressive effect of polypyrimidine tract‐binding protein (PTB). It has been reported that GCAUG is essential for the alternative splicing regulation of several genes including fibronectin. We found that Fox‐1 promoted inclusion of the fibronectin EIIIB exon. Thus, we conclude that Fox‐1 plays key roles in both positive and negative regulation of tissue‐specific splicing via GCAUG.

[1]  Y. Shimura,et al.  Preferential excision of the 5' proximal intron from mRNA precursors with two introns as mediated by the cap structure. , 1987, Proceedings of the National Academy of Sciences of the United States of America.

[2]  Y. Shimura,et al.  Requirement of ATP in the second step of the pre-mRNA splicing reaction. , 1988, Nucleic acids research.

[3]  Y. Shimura,et al.  A nuclear cap binding protein from HeLa cells. , 1990, Nucleic acids research.

[4]  Kunio Inoue,et al.  Binding of the Drosophila Sex-lethal gene product to the alternative splice site of transformer primary transcript , 1990, Nature.

[5]  Gene structure of human mitochondrial ATP synthase gamma-subunit. Tissue specificity produced by alternative RNA splicing. , 1993, The Journal of biological chemistry.

[6]  Michael R. Green,et al.  The protein Sex-lethal antagonizes the splicing factor U2AF to regulate alternative splicing of transformer pre-mRNA , 1993, Nature.

[7]  R. Hynes,et al.  Characterization of HeLa nuclear factors which interact with a conditionally processed rat fibronectin pre-mRNA. , 1993, Biochemical and biophysical research communications.

[8]  R. Hynes,et al.  Elements regulating an alternatively spliced exon of the rat fibronectin gene , 1993, Molecular and cellular biology.

[9]  Gene Structure of Human Mitochondrial ATP Synthase ?-Subunit , 1993 .

[10]  C. Burd,et al.  Conserved structures and diversity of functions of RNA-binding proteins. , 1994, Science.

[11]  R. Hynes,et al.  Regulation of alternative pre-mRNA splicing by a novel repeated hexanucleotide element. , 1994, Genes & development.

[12]  H. Weintraub,et al.  Xenopus embryos regulate the nuclear localization of XMyoD. , 1994, Genes & development.

[13]  P. Norton,et al.  Polypyrimidine tract sequences direct selection of alternative branch sites and influence protein binding. , 1994, Nucleic acids research.

[14]  D. Albertson,et al.  Identification of a candidate primary sex determination locus, fox-1, on the X chromosome of Caenorhabditis elegans. , 1994, Development.

[15]  Y. Shimura,et al.  Aspects of splice site selection in constitutive and alternative pre-mRNA splicing. , 1995, Gene expression.

[16]  S. Kawamoto Neuron-specific alternative splicing of nonmuscle myosin II heavy chain-B pre-mRNA requires a cis-acting intron sequence. , 1996, The Journal of biological chemistry.

[17]  K. Yamamoto,et al.  Two different RNA binding activities for the AU-rich element and the poly(A) sequence of the mouse neuronal protein mHuC. , 1996, Nucleic acids research.

[18]  M. Rosenfeld,et al.  Control of alternative pre-mRNA splicing by distributed pentameric repeats. , 1997, Proceedings of the National Academy of Sciences of the United States of America.

[19]  D L Black,et al.  A complex intronic splicing enhancer from the c-src pre-mRNA activates inclusion of a heterologous exon , 1997, Molecular and cellular biology.

[20]  A. J. Lopez,et al.  Alternative splicing of pre-mRNA: developmental consequences and mechanisms of regulation. , 1998, Annual review of genetics.

[21]  P. Sharp,et al.  Alternative Splicing of the Fibronectin EIIIB Exon Depends on Specific TGCATG Repeats , 1998, Molecular and Cellular Biology.

[22]  C. Gooding,et al.  Polypyrimidine Tract Binding Protein Functions as a Repressor To Regulate Alternative Splicing of α-Actinin Mutally Exclusive Exons , 1999, Molecular and Cellular Biology.

[23]  Kunio Inoue,et al.  Maternal mRNA localization of zebrafish DAZ-like gene , 1999, Mechanisms of Development.

[24]  J. Hodgkin,et al.  Genetic and molecular analysis of fox-1, a numerator element involved in Caenorhabditis elegans primary sex determination. , 1999, Genetics.

[25]  S. Pulst,et al.  A novel protein with RNA-binding motifs interacts with ataxin-2. , 2000, Human molecular genetics.

[26]  J. Valcárcel,et al.  Alternative pre-mRNA splicing: the logic of combinatorial control. , 2000, Trends in biochemical sciences.

[27]  Robert B Darnell,et al.  Nova-1 Regulates Neuron-Specific Alternative Splicing and Is Essential for Neuronal Viability , 2000, Neuron.

[28]  D. Black Protein Diversity from Alternative Splicing A Challenge for Bioinformatics and Post-Genome Biology , 2000, Cell.

[29]  R. Darnell,et al.  A brain-enriched polypyrimidine tract-binding protein antagonizes the ability of Nova to regulate neuron-specific alternative splicing. , 2000, Proceedings of the National Academy of Sciences of the United States of America.

[30]  U. Ikeda,et al.  Differential Regulation of Exonic Regulatory Elements for Muscle-specific Alternative Splicing during Myogenesis and Cardiogenesis* , 2000, The Journal of Biological Chemistry.

[31]  B. Meyer,et al.  Sex in the wormcounting and compensating X-chromosome dose. , 2000, Trends in genetics : TIG.

[32]  International Human Genome Sequencing Consortium Initial sequencing and analysis of the human genome , 2001, Nature.

[33]  D. Black,et al.  Alternative RNA splicing in the nervous system , 2001, Progress in Neurobiology.

[34]  B. Graveley Alternative splicing: increasing diversity in the proteomic world. , 2001, Trends in genetics : TIG.

[35]  T. Cooper,et al.  The CELF Family of RNA Binding Proteins Is Implicated in Cell-Specific and Developmentally Regulated Alternative Splicing , 2001, Molecular and Cellular Biology.

[36]  A. Lieberman,et al.  Androgens regulate the mammalian homologues of invertebrate sex determination genes tra-2 and fox-1. , 2001, Biochemical and biophysical research communications.

[37]  E. Wagner,et al.  Polypyrimidine Tract Binding Protein Antagonizes Exon Definition , 2001, Molecular and Cellular Biology.

[38]  E. Benz,et al.  Multiple cis elements regulate an alternative splicing event at 4.1R pre-mRNA during erythroid differentiation. , 2001, Blood.

[39]  C. Gooding,et al.  Differential alternative splicing activity of isoforms of polypyrimidine tract binding protein (PTB). , 2001, RNA.

[40]  I-Min A. Dubchak,et al.  Computational analysis of candidate intron regulatory elements for tissue-specific alternative pre-mRNA splicing. , 2001, Nucleic acids research.

[41]  Bosiljka Tasic,et al.  Alternative pre-mRNA splicing and proteome expansion in metazoans , 2002, Nature.

[42]  T. Cooper,et al.  Dynamic antagonism between ETR-3 and PTB regulates cell type-specific alternative splicing. , 2002, Molecular cell.

[43]  P. Grabowski,et al.  Function of quaking in myelination: Regulation of alternative splicing , 2002, Proceedings of the National Academy of Sciences of the United States of America.

[44]  P. Grabowski,et al.  Region-specific alternative splicing in the nervous system: implications for regulation by the RNA-binding protein NAPOR. , 2002, RNA.

[45]  Kunio Inoue,et al.  Regulation of alternative splicing of α‐actinin transcript by Bruno‐like proteins , 2002 .

[46]  M. Hayakawa,et al.  Muscle-specific Exonic Splicing Silencer for Exon Exclusion in Human ATP Synthase γ-Subunit Pre-mRNA* 210 , 2002, The Journal of Biological Chemistry.