A Quantitative High-Throughput in Vitro Splicing Assay Identifies
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Premature Termination Codons in PRPF31 Cause Retinitis Pigmentosa Via Haploinsufficiency Due to Nonsense-Mediated Mrna Decay
Premature termination codons in PRPF31 cause retinitis pigmentosa via haploinsufficiency due to nonsense-mediated mRNA decay Thomas Rio Frio, … , Jacques S. Beckmann, Carlo Rivolta J Clin Invest. 2008;118(4):1519-1531. https://doi.org/10.1172/JCI34211. Research Article Genetics Dominant mutations in the gene encoding the mRNA splicing factor PRPF31 cause retinitis pigmentosa, a hereditary form of retinal degeneration. Most of these mutations are characterized by DNA changes that lead to premature termination codons. We investigated 6 different PRPF31 mutations, represented by single-base substitutions or microdeletions, in cell lines derived from 9 patients with dominant retinitis pigmentosa. Five of these mutations lead to premature termination codons, and 1 leads to the skipping of exon 2. Allele-specific measurement of PRPF31 transcripts revealed a strong reduction in the expression of mutant alleles. As a consequence, total PRPF31 protein abundance was decreased, and no truncated proteins were detected. Subnuclear localization of the full-length PRPF31 that was present remained unaffected. Blocking nonsense-mediated mRNA decay significantly restored the amount of mutant PRPF31 mRNA but did not restore the synthesis of mutant proteins, even in conjunction with inhibitors of protein degradation pathways. Our results indicate that most PRPF31 mutations ultimately result in null alleles through the activation of surveillance mechanisms that inactivate mutant mRNA and, possibly, proteins. Furthermore, these data provide compelling evidence that the pathogenic effect of PRPF31 mutations is likely due to haploinsufficiency rather than to gain of function. Find the latest version: https://jci.me/34211/pdf Research article Premature termination codons in PRPF31 cause retinitis pigmentosa via haploinsufficiency due to nonsense-mediated mRNA decay Thomas Rio Frio,1 Nicholas M. -
A Computational Approach for Defining a Signature of Β-Cell Golgi Stress in Diabetes Mellitus
Page 1 of 781 Diabetes A Computational Approach for Defining a Signature of β-Cell Golgi Stress in Diabetes Mellitus Robert N. Bone1,6,7, Olufunmilola Oyebamiji2, Sayali Talware2, Sharmila Selvaraj2, Preethi Krishnan3,6, Farooq Syed1,6,7, Huanmei Wu2, Carmella Evans-Molina 1,3,4,5,6,7,8* Departments of 1Pediatrics, 3Medicine, 4Anatomy, Cell Biology & Physiology, 5Biochemistry & Molecular Biology, the 6Center for Diabetes & Metabolic Diseases, and the 7Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202; 2Department of BioHealth Informatics, Indiana University-Purdue University Indianapolis, Indianapolis, IN, 46202; 8Roudebush VA Medical Center, Indianapolis, IN 46202. *Corresponding Author(s): Carmella Evans-Molina, MD, PhD ([email protected]) Indiana University School of Medicine, 635 Barnhill Drive, MS 2031A, Indianapolis, IN 46202, Telephone: (317) 274-4145, Fax (317) 274-4107 Running Title: Golgi Stress Response in Diabetes Word Count: 4358 Number of Figures: 6 Keywords: Golgi apparatus stress, Islets, β cell, Type 1 diabetes, Type 2 diabetes 1 Diabetes Publish Ahead of Print, published online August 20, 2020 Diabetes Page 2 of 781 ABSTRACT The Golgi apparatus (GA) is an important site of insulin processing and granule maturation, but whether GA organelle dysfunction and GA stress are present in the diabetic β-cell has not been tested. We utilized an informatics-based approach to develop a transcriptional signature of β-cell GA stress using existing RNA sequencing and microarray datasets generated using human islets from donors with diabetes and islets where type 1(T1D) and type 2 diabetes (T2D) had been modeled ex vivo. To narrow our results to GA-specific genes, we applied a filter set of 1,030 genes accepted as GA associated. -
Molecular Signatures in IASLC/ATS/ERS Classified Growth Patterns of Lung Adenocarcinoma
RESEARCH ARTICLE Molecular signatures in IASLC/ATS/ERS classified growth patterns of lung adenocarcinoma 1 1 1,2 1¤a Heike ZabeckID *, Hendrik Dienemann , Hans Hoffmann , Joachim Pfannschmidt , Arne Warth2,3, Philipp A. Schnabel3¤b, Thomas Muley2,4, Michael Meister2,4, Holger SuÈ ltmann2,5, Holger FroÈ hlich6, Ruprecht Kuner2,5¤c, Felix Lasitschka3 1 Department of Thoracic Surgery, Thoraxklinik, University Hospital Heidelberg, Heidelberg, Germany, 2 Translational Lung Research Centre Heidelberg (TLRC-H), German Centre for Lung Research (DZL), a1111111111 Heidelberg, Germany, 3 Institute of Pathology, University Hospital Heidelberg, Heidelberg, Germany, a1111111111 4 Translational Research Unit (STF), Thoraxklinik, University of Heidelberg, Heidelberg, Germany, 5 Cancer a1111111111 Genome Research (B063), German Cancer Research Center (DKFZ) and German Cancer Consortium a1111111111 (DKTK), Heidelberg, Germany, 6 Institute for Computer Science, c/o Bonn-Aachen International Center for a1111111111 IT, Algorithmic Bioinformatics, University of Bonn, Bonn, Germany ¤a Current address: Department of Thoracic Surgery, Lung Clinic Heckeshorn at HELIOS Hospital Emil von Behring, Berlin, Germany ¤b Current address: Institute of Pathology, Saarland University, Homburg/Saar, Germany ¤c Current address: TRONÐTranslational Oncology at the University Medical Center of Johannes OPEN ACCESS Gutenberg University, Mainz, Germany * [email protected] Citation: Zabeck H, Dienemann H, Hoffmann H, Pfannschmidt J, Warth A, Schnabel PA, et al. (2018) Molecular signatures in IASLC/ATS/ERS classified growth patterns of lung adenocarcinoma. Abstract PLoS ONE 13(10): e0206132. https://doi.org/ 10.1371/journal.pone.0206132 Editor: Stefania Crispi, Institute for Bioscience and Background Biotechnology Research, ITALY The current classification of human lung adenocarcinoma defines five different histological Received: April 4, 2018 growth patterns within the group of conventional invasive adenocarcinomas. -
Transcriptome Sequencing and Genome-Wide Association Analyses Reveal Lysosomal Function and Actin Cytoskeleton Remodeling in Schizophrenia and Bipolar Disorder
Molecular Psychiatry (2015) 20, 563–572 © 2015 Macmillan Publishers Limited All rights reserved 1359-4184/15 www.nature.com/mp ORIGINAL ARTICLE Transcriptome sequencing and genome-wide association analyses reveal lysosomal function and actin cytoskeleton remodeling in schizophrenia and bipolar disorder Z Zhao1,6,JXu2,6, J Chen3,6, S Kim4, M Reimers3, S-A Bacanu3,HYu1, C Liu5, J Sun1, Q Wang1, P Jia1,FXu2, Y Zhang2, KS Kendler3, Z Peng2 and X Chen3 Schizophrenia (SCZ) and bipolar disorder (BPD) are severe mental disorders with high heritability. Clinicians have long noticed the similarities of clinic symptoms between these disorders. In recent years, accumulating evidence indicates some shared genetic liabilities. However, what is shared remains elusive. In this study, we conducted whole transcriptome analysis of post-mortem brain tissues (cingulate cortex) from SCZ, BPD and control subjects, and identified differentially expressed genes in these disorders. We found 105 and 153 genes differentially expressed in SCZ and BPD, respectively. By comparing the t-test scores, we found that many of the genes differentially expressed in SCZ and BPD are concordant in their expression level (q ⩽ 0.01, 53 genes; q ⩽ 0.05, 213 genes; q ⩽ 0.1, 885 genes). Using genome-wide association data from the Psychiatric Genomics Consortium, we found that these differentially and concordantly expressed genes were enriched in association signals for both SCZ (Po10 − 7) and BPD (P = 0.029). To our knowledge, this is the first time that a substantially large number of genes show concordant expression and association for both SCZ and BPD. Pathway analyses of these genes indicated that they are involved in the lysosome, Fc gamma receptor-mediated phagocytosis, regulation of actin cytoskeleton pathways, along with several cancer pathways. -
Genes with 5' Terminal Oligopyrimidine Tracts Preferentially Escape Global Suppression of Translation by the SARS-Cov-2 NSP1 Protein
Downloaded from rnajournal.cshlp.org on September 28, 2021 - Published by Cold Spring Harbor Laboratory Press Genes with 5′ terminal oligopyrimidine tracts preferentially escape global suppression of translation by the SARS-CoV-2 Nsp1 protein Shilpa Raoa, Ian Hoskinsa, Tori Tonna, P. Daniela Garciaa, Hakan Ozadama, Elif Sarinay Cenika, Can Cenika,1 a Department of Molecular Biosciences, University of Texas at Austin, Austin, TX 78712, USA 1Corresponding author: [email protected] Key words: SARS-CoV-2, Nsp1, MeTAFlow, translation, ribosome profiling, RNA-Seq, 5′ TOP, Ribo-Seq, gene expression 1 Downloaded from rnajournal.cshlp.org on September 28, 2021 - Published by Cold Spring Harbor Laboratory Press Abstract Viruses rely on the host translation machinery to synthesize their own proteins. Consequently, they have evolved varied mechanisms to co-opt host translation for their survival. SARS-CoV-2 relies on a non-structural protein, Nsp1, for shutting down host translation. However, it is currently unknown how viral proteins and host factors critical for viral replication can escape a global shutdown of host translation. Here, using a novel FACS-based assay called MeTAFlow, we report a dose-dependent reduction in both nascent protein synthesis and mRNA abundance in cells expressing Nsp1. We perform RNA-Seq and matched ribosome profiling experiments to identify gene-specific changes both at the mRNA expression and translation level. We discover that a functionally-coherent subset of human genes are preferentially translated in the context of Nsp1 expression. These genes include the translation machinery components, RNA binding proteins, and others important for viral pathogenicity. Importantly, we uncovered a remarkable enrichment of 5′ terminal oligo-pyrimidine (TOP) tracts among preferentially translated genes. -
Determinants of Exon 7 Splicing in the Spinal Muscular Atrophy Genes, SMN1 and SMN2 Luca Cartegni,*,† Michelle L
Determinants of Exon 7 Splicing in the Spinal Muscular Atrophy Genes, SMN1 and SMN2 Luca Cartegni,*,† Michelle L. Hastings,* John A. Calarco,‡ Elisa de Stanchina, and Adrian R. Krainer Cold Spring Harbor Laboratory, Cold Spring Harbor, NY Spinal muscular atrophy is a neurodegenerative disorder caused by the deletion or mutation of the survival-of- motor-neuron gene, SMN1. An SMN1 paralog, SMN2, differs by a CrT transition in exon 7 that causes substantial skipping of this exon, such that SMN2 expresses only low levels of functional protein. A better understanding of SMN splicing mechanisms should facilitate the development of drugs that increase survival motor neuron (SMN) protein levels by improving SMN2 exon 7 inclusion. In addition, exonic mutations that cause defective splicing give rise to many genetic diseases, and the SMN1/2 system is a useful paradigm for understanding exon-identity determinants and alternative-splicing mechanisms. Skipping of SMN2 exon 7 was previously attributed either to the loss of an SF2/ASF–dependent exonic splicing enhancer or to the creation of an hnRNP A/B–dependent exonic splicing silencer, as a result of the CrT transition. We report the extensive testing of the enhancer-loss and silencer- gain models by mutagenesis, RNA interference, overexpression, RNA splicing, and RNA-protein interaction ex- periments. Our results support the enhancer-loss model but also demonstrate that hnRNP A/B proteins antagonize SF2/ASF–dependent ESE activity and promote exon 7 skipping by a mechanism that is independent of the CrT transition and is, therefore, common to both SMN1 and SMN2. Our findings explain the basis of defective SMN2 splicing, illustrate the fine balance between positive and negative determinants of exon identity and alternative splicing, and underscore the importance of antagonistic splicing factors and exonic elements in a disease context. -
Nuclear PTEN Safeguards Pre-Mrna Splicing to Link Golgi Apparatus for Its Tumor Suppressive Role
ARTICLE DOI: 10.1038/s41467-018-04760-1 OPEN Nuclear PTEN safeguards pre-mRNA splicing to link Golgi apparatus for its tumor suppressive role Shao-Ming Shen1, Yan Ji2, Cheng Zhang1, Shuang-Shu Dong2, Shuo Yang1, Zhong Xiong1, Meng-Kai Ge1, Yun Yu1, Li Xia1, Meng Guo1, Jin-Ke Cheng3, Jun-Ling Liu1,3, Jian-Xiu Yu1,3 & Guo-Qiang Chen1 Dysregulation of pre-mRNA alternative splicing (AS) is closely associated with cancers. However, the relationships between the AS and classic oncogenes/tumor suppressors are 1234567890():,; largely unknown. Here we show that the deletion of tumor suppressor PTEN alters pre-mRNA splicing in a phosphatase-independent manner, and identify 262 PTEN-regulated AS events in 293T cells by RNA sequencing, which are associated with significant worse outcome of cancer patients. Based on these findings, we report that nuclear PTEN interacts with the splicing machinery, spliceosome, to regulate its assembly and pre-mRNA splicing. We also identify a new exon 2b in GOLGA2 transcript and the exon exclusion contributes to PTEN knockdown-induced tumorigenesis by promoting dramatic Golgi extension and secretion, and PTEN depletion significantly sensitizes cancer cells to secretion inhibitors brefeldin A and golgicide A. Our results suggest that Golgi secretion inhibitors alone or in combination with PI3K/Akt kinase inhibitors may be therapeutically useful for PTEN-deficient cancers. 1 Department of Pathophysiology, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine (SJTU-SM), Shanghai 200025, China. 2 Institute of Health Sciences, Shanghai Institutes for Biological Sciences of Chinese Academy of Sciences and SJTU-SM, Shanghai 200025, China. -
Dissertation
Regulation of gene silencing: From microRNA biogenesis to post-translational modifications of TNRC6 complexes DISSERTATION zur Erlangung des DOKTORGRADES DER NATURWISSENSCHAFTEN (Dr. rer. nat.) der Fakultät Biologie und Vorklinische Medizin der Universität Regensburg vorgelegt von Johannes Danner aus Eggenfelden im Jahr 2017 Das Promotionsgesuch wurde eingereicht am: 12.09.2017 Die Arbeit wurde angeleitet von: Prof. Dr. Gunter Meister Johannes Danner Summary ‘From microRNA biogenesis to post-translational modifications of TNRC6 complexes’ summarizes the two main projects, beginning with the influence of specific RNA binding proteins on miRNA biogenesis processes. The fate of the mature miRNA is determined by the incorporation into Argonaute proteins followed by a complex formation with TNRC6 proteins as core molecules of gene silencing complexes. miRNAs are transcribed as stem-loop structured primary transcripts (pri-miRNA) by Pol II. The further nuclear processing is carried out by the microprocessor complex containing the RNase III enzyme Drosha, which cleaves the pri-miRNA to precursor-miRNA (pre-miRNA). After Exportin-5 mediated transport of the pre-miRNA to the cytoplasm, the RNase III enzyme Dicer cleaves off the terminal loop resulting in a 21-24 nt long double-stranded RNA. One of the strands is incorporated in the RNA-induced silencing complex (RISC), where it directly interacts with a member of the Argonaute protein family. The miRNA guides the mature RISC complex to partially complementary target sites on mRNAs leading to gene silencing. During this process TNRC6 proteins interact with Argonaute and recruit additional factors to mediate translational repression and target mRNA destabilization through deadenylation and decapping leading to mRNA decay. -
Pseudophosphorylated Αb-Crystallin Is a Nuclear Chaperone Imported Into the Nucleus with Help of the SMN Complex
Pseudophosphorylated αB-Crystallin Is a Nuclear Chaperone Imported into the Nucleus with Help of the SMN Complex John den Engelsman1, Chantal van de Schootbrugge1, Jeongsik Yong2, Ger J. M. Pruijn1, Wilbert C. Boelens1* 1 Department of Biomolecular Chemistry, Institute for Molecules and Materials and Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen, Nijmegen, The Netherlands, 2 Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota Twin Cities, Minneapolis, Minnesota, United States of America Abstract The human small heat shock protein αB-crystallin (HspB5) is a molecular chaperone which is mainly localized in the cytoplasm. A small fraction can also be found in nuclear speckles, of which the localization is mediated by successional phosphorylation at Ser-59 and Ser-45. αB-crystallin does not contain a canonical nuclear localization signal sequence and the mechanism by which αB-crystallin is imported into the nucleus is not known. Here we show that after heat shock pseudophosphorylated αB-crystallin mutant αB-STD, in which all three phosphorylatable serine residues (Ser-19, Ser-45 and Ser-59) were replaced by negatively charged aspartate residues, is released from the nuclear speckles. This allows αB-crystallin to chaperone proteins in the nucleoplasm, as shown by the ability of αB- STD to restore nuclear firefly luciferase activity after a heat shock. With the help of a yeast two-hybrid screen we found that αB-crystallin can interact with the C-terminal part of Gemin3 and confirmed this interaction by co- immunoprecipitation. Gemin3 is a component of the SMN complex, which is involved in the assembly and nuclear import of U-snRNPs. -
Three Gene-Targeted Mouse Models of RNA Splicing Factor RP Show Late-Onset RPE and Retinal Degeneration John J
Three Gene-Targeted Mouse Models of RNA Splicing Factor RP Show Late-Onset RPE and Retinal Degeneration John J. Graziotto, Michael Farkas, Kinga Bujakowska, Bertrand M. Deramaudt, Qi Zhang, Emeline F. Nandrot, Chris F. Inglehearn, Shomi S. Bhattacharya, Eric A. Pierce To cite this version: John J. Graziotto, Michael Farkas, Kinga Bujakowska, Bertrand M. Deramaudt, Qi Zhang, et al.. Three Gene-Targeted Mouse Models of RNA Splicing Factor RP Show Late-Onset RPE and Retinal Degeneration. Investigative Ophthalmology & Visual Science, Association for Research in Vision and Ophthalmology, 2011. hal-03086760 HAL Id: hal-03086760 https://hal.archives-ouvertes.fr/hal-03086760 Submitted on 22 Dec 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Biochemistry and Molecular Biology Three Gene-Targeted Mouse Models of RNA Splicing Factor RP Show Late-Onset RPE and Retinal Degeneration John J. Graziotto,1,2 Michael H. Farkas,1 Kinga Bujakowska,3 Bertrand M. Deramaudt,1 Qi Zhang,1 Emeline F. Nandrot,3 Chris F. Inglehearn,4 Shomi S. Bhattacharya,3,5 and Eric A. Pierce1 PURPOSE. Mutations in genes that produce proteins involved in mice, and were associated with decreased rod function in the mRNA splicing, including pre-mRNA processing factors 3, 8, Prpf3-T494M mice. -
Interaction Profiling of RNA-Binding Ubiquitin Ligases Reveals A
www.nature.com/scientificreports OPEN Interaction profling of RNA- binding ubiquitin ligases reveals a link between posttranscriptional Received: 7 March 2017 Accepted: 14 September 2017 regulation and the ubiquitin system Published: xx xx xxxx Andrea Hildebrandt1, Gregorio Alanis-Lobato1,2, Andrea Voigt1, Kathi Zarnack3, Miguel A. Andrade-Navarro1,2, Petra Beli1 & Julian König1 RNA-binding ubiquitin ligases (RBULs) have the potential to link RNA-mediated mechanisms to protein ubiquitylation. Despite this, the cellular functions, substrates and interaction partners of most RBULs remain poorly characterized. Afnity purifcation (AP) combined with quantitative mass spectrometry (MS)-based proteomics is a powerful approach for analyzing protein functions. Mapping the physiological interaction partners of RNA-binding proteins has been hampered by their intrinsic properties, in particular the existence of low-complexity regions, which are prone to engage in non- physiological interactions. Here, we used an adapted AP approach to identify the interaction partners of human RBULs harboring diferent RNA-binding domains. To increase the likelihood of recovering physiological interactions, we combined control and bait-expressing cells prior to lysis. In this setup, only stable interactions that were originally present in the cell will be identifed. We exploit gene function similarity between the bait proteins and their interactors to benchmark our approach in its ability to recover physiological interactions. We reveal that RBULs engage in stable interactions with RNA-binding proteins involved in diferent steps of RNA metabolism as well as with components of the ubiquitin conjugation machinery and ubiquitin-binding proteins. Our results thus demonstrate their capacity to link posttranscriptional regulation with the ubiquitin system. -
Molecular Functions of the SMN Complex Hosted at Stephen J
Special Issue Article Journal of Child Neurology Volume 22 Number 8 August 2007 990-994 © 2007 Sage Publications 10.1177/0883073807305666 Molecular Functions of the SMN Complex http://jcn.sagepub.com hosted at http://online.sagepub.com Stephen J. Kolb, MD, PhD, Daniel J. Battle, PhD, and Gideon Dreyfuss, PhD The SMN complex is essential for the biogenesis of spliceoso- contains 7 additional proteins known as Gemin2-8, each likely mal small nuclear ribonucleoproteins and likely functions in to play a role in ribonucleoprotein biogenesis. This review the assembly, metabolism, and transport of a diverse number focuses on the current understanding of the mechanism of the of other ribonucleoproteins. Specifically, the SMN complex role of the SMN complex in small nuclear ribonucleoprotein assembles 7 Sm proteins into a core structure around a highly assembly and considers the relationship of this function to conserved sequence of ribonucleic acid (RNA) found in small spinal muscular atrophy. nuclear RNAs. The complex recognizes specific sequences and structural features of small nuclear RNAs and Sm proteins and assembles small nuclear ribonucleoproteins in a stepwise Keywords: spinal muscular atrophy; ribonucleoproteins; fashion. In addition to the SMN protein, the SMN complex Gemin2-8 utations in the survival motor neuron gene Since 1995, when mutations in SMN were shown to (SMN) that decrease expression of the func- cause spinal muscular atrophy,2 there has been great Mtional SMN protein result in spinal muscular progress toward understanding the molecular functions of atrophy. Within the pediatric population, spinal muscular the SMN protein in cells, the cellular pathways that are atrophy can be included in the list of single gene defect affected by decreased expression of SMN, and the design of diseases where the loss of a single essential protein potential therapeutic strategies to treat patients with this dis- expressed in all tissues and cells results in the selective ease.