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Horner SM, Thompson MG. Challenges to mapping and defining m 6A function in viral RNA. RNA 2024; 30:482-490. [PMID: 38531643 PMCID: PMC11019751 DOI: 10.1261/rna.079959.124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Accepted: 02/09/2024] [Indexed: 03/28/2024]
Abstract
Viral RNA molecules contain multiple layers of regulatory information. This includes features beyond the primary sequence, such as RNA structures and RNA modifications, including N6-methyladenosine (m6A). Many recent studies have identified the presence and location of m6A in viral RNA and have found diverse regulatory roles for this modification during viral infection. However, to date, viral m6A mapping strategies have limitations that prevent a complete understanding of the function of m6A on individual viral RNA molecules. While m6A sites have been profiled on bulk RNA from many viruses, the resulting m6A maps of viral RNAs described to date present a composite picture of m6A across viral RNA molecules in the infected cell. Thus, for most viruses, it is unknown if unique viral m6A profiles exist throughout infection, nor if they regulate specific viral life cycle stages. Here, we describe several challenges to defining the function of m6A in viral RNA molecules and provide a framework for future studies to help in the understanding of how m6A regulates viral infection.
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Affiliation(s)
- Stacy M Horner
- Department of Integrative Immunobiology, Duke University School of Medicine, Durham, North Carolina 27710, USA
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina 27710, USA
| | - Matthew G Thompson
- Department of Integrative Immunobiology, Duke University School of Medicine, Durham, North Carolina 27710, USA
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2
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Rasmussen AL, Gronvall GK, Lowen AC, Goodrum F, Alwine J, Andersen KG, Anthony SJ, Baines J, Banerjee A, Broadbent AJ, Brooke CB, Campos SK, Caposio P, Casadevall A, Chan GC, Cliffe AR, Collins-McMillen D, Connell N, Damania B, Daugherty MD, Debbink K, Dermody TS, DiMaio D, Duprex WP, Emerman M, Galloway DA, Garry RF, Goldstein SA, Greninger AL, Hartman AL, Hogue BG, Horner SM, Hotez PJ, Jung JU, Kamil JP, Karst SM, Laimins L, Lakdawala SS, Landais I, Letko M, Lindenbach B, Liu SL, Luftig M, McFadden G, Mehle A, Morrison J, Moscona A, Mühlberger E, Munger J, Münger K, Murphy E, Neufeldt CJ, Nikolich JZ, O'Connor CM, Pekosz A, Permar SR, Pfeiffer JK, Popescu SV, Purdy JG, Racaniello VR, Rice CM, Runstadler JA, Sapp MJ, Scott RS, Smith GA, Sorrell EM, Speranza E, Streblow D, Tibbetts SA, Toth Z, Van Doorslaer K, Weiss SR, White EA, White TM, Wobus CE, Worobey M, Yamaoka S, Yurochko A. Correction for Rasmussen et al., "Virology-the path forward". J Virol 2024; 98:e0007424. [PMID: 38334328 PMCID: PMC10949460 DOI: 10.1128/jvi.00074-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2024] Open
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3
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Rasmussen AL, Gronvall GK, Lowen AC, Goodrum F, Alwine J, Andersen KG, Anthony SJ, Baines J, Banerjee A, Broadbent AJ, Brooke CB, Campos SK, Caposio P, Casadevall A, Chan GC, Cliffe AR, Collins-McMillen D, Connell N, Damania B, Daugherty MD, Debbink K, Dermody TS, DiMaio D, Duprex WP, Emerman M, Galloway DA, Garry RF, Goldstein SA, Greninger AL, Hartman AL, Hogue BG, Horner SM, Hotez PJ, Jung JU, Kamil JP, Karst SM, Laimins L, Lakdawala SS, Landais I, Letko M, Lindenbach B, Liu SL, Luftig M, McFadden G, Mehle A, Morrison J, Moscona A, Mühlberger E, Munger J, Münger K, Murphy E, Neufeldt CJ, Nikolich JZ, O'Connor CM, Pekosz A, Permar SR, Pfeiffer JK, Popescu SV, Purdy JG, Racaniello VR, Rice CM, Runstadler JA, Sapp MJ, Scott RS, Smith GA, Sorrell EM, Speranza E, Streblow D, Tibbetts SA, Toth Z, Van Doorslaer K, Weiss SR, White EA, White TM, Wobus CE, Worobey M, Yamaoka S, Yurochko A. Virology-the path forward. J Virol 2024; 98:e0179123. [PMID: 38168672 PMCID: PMC10804978 DOI: 10.1128/jvi.01791-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024] Open
Abstract
In the United States (US), biosafety and biosecurity oversight of research on viruses is being reappraised. Safety in virology research is paramount and oversight frameworks should be reviewed periodically. Changes should be made with care, however, to avoid impeding science that is essential for rapidly reducing and responding to pandemic threats as well as addressing more common challenges caused by infectious diseases. Decades of research uniquely positioned the US to be able to respond to the COVID-19 crisis with astounding speed, delivering life-saving vaccines within a year of identifying the virus. We should embolden and empower this strength, which is a vital part of protecting the health, economy, and security of US citizens. Herein, we offer our perspectives on priorities for revised rules governing virology research in the US.
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Affiliation(s)
- Angela L. Rasmussen
- Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, Canada
- Department of Biochemistry, Microbiology, and Immunology, University of Saskatchewan, Saskatoon, Canada
- Department of Ecology and Evolution, Stony Brook University, Stony Brook, New York, USA
| | - Gigi K. Gronvall
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Anice C. Lowen
- Department of Microbiology and Immunology, Emory University, Atlanta, Georgia, USA
| | - Felicia Goodrum
- Department of Immunobiology, University of Arizona, Tucson, Arizona, USA
| | - James Alwine
- Department of Cancer Biology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Kristian G. Andersen
- Department of Immunology and Microbiology, Scripps Research, La Jolla, California, USA
| | - Simon J. Anthony
- Department of Pathology, Microbiology, and Immunology, University of California, Davis, Davis, California, USA
| | - Joel Baines
- Department of Microbiology and Immunology, Cornell University, Ithaca, New York, USA
| | - Arinjay Banerjee
- Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, Canada
| | - Andrew J. Broadbent
- Department of Animal and Avian Sciences, University of Maryland, College Park, Maryland, USA
| | - Christopher B. Brooke
- Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Samuel K. Campos
- Department of Immunobiology, University of Arizona, Tucson, Arizona, USA
| | - Patrizia Caposio
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Beaverton, Oregon, USA
| | - Arturo Casadevall
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Gary C. Chan
- Department of Microbiology and Immunology, SUNY Upstate Medical Center, Syracuse, New York, USA
| | - Anna R. Cliffe
- Department of Microbiology, Immunology, and Cancer Biology, University of Virginia, Charlottesville, Virginia, USA
| | | | - Nancy Connell
- Department of Medicine, Rutgers New Jersey Medical School, Newark, New Jersey, USA
| | - Blossom Damania
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Matthew D. Daugherty
- Department of Molecular Biology, University of California, San Diego, La Jolla, California, USA
| | - Kari Debbink
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Terence S. Dermody
- Department of Pediatrics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Daniel DiMaio
- Department of Genetics, Yale School of Medicine, New Haven, Connecticut, USA
| | - W. Paul Duprex
- Center for Vaccine Research, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Michael Emerman
- Human Biology Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Denise A. Galloway
- Human Biology Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Robert F. Garry
- Department of Microbiology and Immunology, Tulane University School of Medicine, New Orleans, Louisiana, USA
| | - Stephen A. Goldstein
- Department of Human Genetics, University of Utah School of Medicine, Salt Lake City, Utah, USA
| | - Alexander L. Greninger
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA
| | - Amy L. Hartman
- Department of Infectious Diseases and Microbiology, University of Pittsburgh School of Public Health, Pittsburgh, Pennsylvania, USA
| | - Brenda G. Hogue
- School of Life Sciences, Arizona State University, Tempe, Arizona, USA
| | - Stacy M. Horner
- Department of Integrative Immunobiology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Peter J. Hotez
- Department of Pediatrics, National School of Tropical Medicine, Baylor College of Medicine, Houston, Texas, USA
- Department of Molecular Virology and Microbiology, National School of Tropical Medicine, Baylor College of Medicine, Houston, Texas, USA
| | - Jae U. Jung
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Jeremy P. Kamil
- Department of Microbiology and Immunology, Louisiana State University Health Sciences Center Shreveport, Shreveport, Louisiana, USA
| | - Stephanie M. Karst
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, Florida, USA
| | - Lou Laimins
- Department of Microbiology, Ohio State University, Wooster, Ohio, USA
| | - Seema S. Lakdawala
- Department of Microbiology and Immunology, Emory University, Atlanta, Georgia, USA
| | - Igor Landais
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Beaverton, Oregon, USA
| | - Michael Letko
- Paul G. Allen School for Global Health, Washington State University, Pullman, Washington, USA
| | - Brett Lindenbach
- Department of Microbial Pathogenesis, Yale University, New Haven, USA
| | - Shan-Lu Liu
- Department of Microbiology, Ohio State University, Wooster, Ohio, USA
- Viruses and Emerging Pathogens Program, Infectious Diseases Institute, Ohio State University, Wooster, Ohio, USA
| | - Micah Luftig
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Grant McFadden
- School of Life Sciences, Arizona State University, Tempe, Arizona, USA
| | - Andrew Mehle
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Juliet Morrison
- Department of Microbiology and Plant Pathology, University of California, Riverside, Riverside, California, USA
| | - Anne Moscona
- Department of Microbiology and Immunology, Columbia University, New York, New York, USA
- Department of Physiology, Columbia University, New York, New York, USA
- Department of Biophysics, Columbia University, New York, New York, USA
| | - Elke Mühlberger
- Department of Virology, Immunology, and Microbiology, Boston University, Boston, Massachusetts, USA
| | - Joshua Munger
- Department of Biochemistry and Biophysics, University of Rochester, Rochester, New York, USA
| | - Karl Münger
- Department of Developmental, Molecular, and Chemical Biology, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - Eain Murphy
- Department of Microbiology and Immunology, SUNY Upstate Medical Center, Syracuse, New York, USA
| | | | - Janko Z. Nikolich
- Department of Immunobiology, University of Arizona, Tucson, Arizona, USA
- Aegis Consortium for a Pandemic-Free Future, University of Arizona, Tucson, Arizona, USA
| | | | - Andrew Pekosz
- Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Sallie R. Permar
- Department of Pediatrics, Weill Cornell Medicine, New York, New York, USA
| | - Julie K. Pfeiffer
- Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Saskia V. Popescu
- Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - John G. Purdy
- Department of Immunobiology, University of Arizona, Tucson, Arizona, USA
| | - Vincent R. Racaniello
- Department of Microbiology and Immunology, Columbia University, New York, New York, USA
| | - Charles M. Rice
- Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, New York, USA
| | - Jonathan A. Runstadler
- Department of Infectious Disease and Global Health, Cummings School of Veterinary Medicine at Tufts University, North Grafton, Massachusetts, USA
| | - Martin J. Sapp
- Department of Microbiology and Immunology, Louisiana State University Health Sciences Center Shreveport, Shreveport, Louisiana, USA
| | - Rona S. Scott
- Department of Microbiology and Immunology, Louisiana State University Health Sciences Center Shreveport, Shreveport, Louisiana, USA
| | - Gregory A. Smith
- Department of Microbiology, Ohio State University, Wooster, Ohio, USA
| | - Erin M. Sorrell
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Emily Speranza
- Florida Research and Innovation Center, Cleveland Clinic Lerner Research Institute, Port St. Lucie, Florida, USA
| | - Daniel Streblow
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Beaverton, Oregon, USA
| | - Scott A. Tibbetts
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, Florida, USA
| | - Zsolt Toth
- Department of Oral Biology, University of Florida, Gainesville, Florida, USA
| | | | - Susan R. Weiss
- Department of Microbiology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Elizabeth A. White
- Department of Otorhinolaryngology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Timothy M. White
- Department of Immunobiology, University of Arizona, Tucson, Arizona, USA
| | - Christiane E. Wobus
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, USA
| | - Michael Worobey
- Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona, USA
| | - Satoko Yamaoka
- Department of Infectious Diseases, Mayo Clinic, Rochester, Minnesota, USA
| | - Andrew Yurochko
- Department of Microbiology and Immunology, Louisiana State University Health Sciences Center Shreveport, Shreveport, Louisiana, USA
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Aufgebauer CJ, Bland KM, Horner SM. Modifying the antiviral innate immune response by selective writing, erasing, and reading of m 6A on viral and cellular RNA. Cell Chem Biol 2024; 31:100-109. [PMID: 38176419 PMCID: PMC10872403 DOI: 10.1016/j.chembiol.2023.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 11/21/2023] [Accepted: 12/06/2023] [Indexed: 01/06/2024]
Abstract
Viral infection and the antiviral innate immune response are regulated by the RNA modification m6A. m6A directs nearly all aspects of RNA metabolism by recruiting RNA-binding proteins that mediate the fate of m6A-containing RNA. m6A controls the antiviral innate immune response in diverse ways, including shielding viral RNA from detection by antiviral sensors and influencing the expression of cellular mRNAs encoding antiviral signaling proteins, cytokines, and effector proteins. While m6A and the m6A machinery are important for the antiviral response, the precise mechanisms that determine how the m6A machinery selects specific viral or cellular RNA molecules for modification during infection are not fully understood. In this review, we highlight recent findings that shed light on how viral infection redirects the m6A machinery during the antiviral response. A better understanding of m6A targeting during viral infection could lead to new immunomodulatory and therapeutic strategies against viral infection.
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Affiliation(s)
- Caroline J Aufgebauer
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Katherine M Bland
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC 27710, USA; Department of Integrative Immunobiology, Duke University School of Medicine, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine, Durham, NC 27710, USA.
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5
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Marayati BF, Thompson MG, Holley CL, Horner SM, Meyer KD. Programmable protein expression using a genetically encoded m 6A sensor. Nat Biotechnol 2024:10.1038/s41587-023-01978-3. [PMID: 38168988 DOI: 10.1038/s41587-023-01978-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 09/01/2023] [Indexed: 01/05/2024]
Abstract
The N6-methyladenosine (m6A) modification is found in thousands of cellular mRNAs and is a critical regulator of gene expression and cellular physiology. m6A dysregulation contributes to several human diseases, and the m6A methyltransferase machinery has emerged as a promising therapeutic target. However, current methods for studying m6A require RNA isolation and do not provide a real-time readout of mRNA methylation in living cells. Here we present a genetically encoded m6A sensor (GEMS) technology, which couples a fluorescent signal with cellular mRNA methylation. GEMS detects changes in m6A caused by pharmacological inhibition of the m6A methyltransferase, giving it potential utility for drug discovery efforts. Additionally, GEMS can be programmed to achieve m6A-dependent delivery of custom protein payloads in cells. Thus, GEMS is a versatile platform for m6A sensing that provides both a simple readout for m6A methylation and a system for m6A-coupled protein expression.
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Affiliation(s)
- Bahjat F Marayati
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, USA
| | - Matthew G Thompson
- Department of Integrative Immunobiology, Duke University School of Medicine, Durham, NC, USA
| | - Christopher L Holley
- Department of Medicine, Duke University School of Medicine, Durham, NC, USA
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC, USA
| | - Stacy M Horner
- Department of Integrative Immunobiology, Duke University School of Medicine, Durham, NC, USA
- Department of Medicine, Duke University School of Medicine, Durham, NC, USA
| | - Kate D Meyer
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, USA.
- Department of Neurobiology, Duke University School of Medicine, Durham, NC, USA.
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6
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Thompson MG, Horner SM. The Evil DExH/D: Chikungunya virus runs but cannot hide from DDX39A. Mol Cell 2023; 83:3948-3949. [PMID: 37977114 DOI: 10.1016/j.molcel.2023.10.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 10/23/2023] [Accepted: 10/23/2023] [Indexed: 11/19/2023]
Abstract
In this issue, Tapescu et al.1 identify DDX39A as a novel antiviral protein that acts on conserved features of alphavirus RNA to limit infection in an IFN-independent manner.
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Affiliation(s)
- Matthew G Thompson
- Department of Integrative Immunobiology, Duke University School of Medicine, Durham, NC, USA
| | - Stacy M Horner
- Department of Integrative Immunobiology, Duke University School of Medicine, Durham, NC, USA; Department of Medicine, Duke University School of Medicine, Durham, NC, USA.
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7
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Gokhale NS, Somfleth K, Thompson MG, Sam RK, Marciniak DM, Chu LH, Park M, Dvorkin S, Oberst A, Horner SM, Ong SE, Gale M, Savan R. CELLULAR RNA INTERACTS WITH MAVS TO PROMOTE ANTIVIRAL SIGNALING. bioRxiv 2023:2023.09.25.559083. [PMID: 37808873 PMCID: PMC10557580 DOI: 10.1101/2023.09.25.559083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
Immune signaling needs to be well-regulated to promote clearance of pathogens, while preventing aberrant inflammation. Interferons (IFNs) and antiviral genes are activated by the detection of viral RNA by RIG-I-like receptors (RLRs). Signal transduction downstream of RLRs proceeds through a multi-protein complex organized around the central adaptor protein MAVS. Recent work has shown that protein complex function can be modulated by RNA molecules providing allosteric regulation or acting as molecular guides or scaffolds. Thus, we hypothesized that RNA plays a role in organizing MAVS signaling platforms. Here, we show that MAVS, through its central intrinsically disordered domain, directly interacts with the 3' untranslated regions of cellular mRNAs. Importantly, elimination of RNA by RNase treatment disrupts the MAVS signalosome, including newly identified regulators of RLR signaling, and inhibits phosphorylation of the transcription factor IRF3. This supports the hypothesis that RNA molecules scaffold proteins in the MAVS signalosome to induce IFNs. Together, this work uncovers a function for cellular RNA in promoting signaling through MAVS and highlights a generalizable principle of RNA regulatory control of cytoplasmic immune signaling complexes.
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Affiliation(s)
| | - Kim Somfleth
- Department of Immunology, University of Washington, Seattle, WA
| | | | - Russell K Sam
- Department of Immunology, University of Washington, Seattle, WA
| | | | - Lan H Chu
- Department of Immunology, University of Washington, Seattle, WA
| | - Moonhee Park
- Department of Integrative Immunobiology, Duke University, Durham, NC
| | - Steve Dvorkin
- Department of Immunology, University of Washington, Seattle, WA
| | - Andrew Oberst
- Department of Immunology, University of Washington, Seattle, WA
| | - Stacy M Horner
- Department of Integrative Immunobiology, Duke University, Durham, NC
- Department of Medicine, Duke University, Durham NC
| | - Shao-En Ong
- Department of Pharmacology, University of Washington, Seattle, WA
| | - Michael Gale
- Department of Immunology, University of Washington, Seattle, WA
| | - Ram Savan
- Department of Immunology, University of Washington, Seattle, WA
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Boerneke MA, Gokhale NS, Horner SM, Weeks KM. Structure-first identification of RNA elements that regulate dengue virus genome architecture and replication. Proc Natl Acad Sci U S A 2023; 120:e2217053120. [PMID: 37011200 PMCID: PMC10104495 DOI: 10.1073/pnas.2217053120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 03/02/2023] [Indexed: 04/05/2023] Open
Abstract
The genomes of RNA viruses encode the information required for replication in host cells both in their linear sequence and in complex higher-order structures. A subset of these RNA genome structures show clear sequence conservation, and have been extensively described for well-characterized viruses. However, the extent to which viral RNA genomes contain functional structural elements-unable to be detected by sequence alone-that nonetheless are critical to viral fitness is largely unknown. Here, we devise a structure-first experimental strategy and use it to identify 22 structure-similar motifs across the coding sequences of the RNA genomes for the four dengue virus serotypes. At least 10 of these motifs modulate viral fitness, revealing a significant unnoticed extent of RNA structure-mediated regulation within viral coding sequences. These viral RNA structures promote a compact global genome architecture, interact with proteins, and regulate the viral replication cycle. These motifs are also thus constrained at the levels of both RNA structure and protein sequence and are potential resistance-refractory targets for antivirals and live-attenuated vaccines. Structure-first identification of conserved RNA structure enables efficient discovery of pervasive RNA-mediated regulation in viral genomes and, likely, other cellular RNAs.
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Affiliation(s)
- Mark A. Boerneke
- Department of Chemistry, University of North Carolina, Chapel Hill, NC27599-3290
| | - Nandan S. Gokhale
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC27710
| | - Stacy M. Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC27710
- Department of Medicine, Duke University Medical Center, Durham, NC27710
| | - Kevin M. Weeks
- Department of Chemistry, University of North Carolina, Chapel Hill, NC27599-3290
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Sacco MT, Bland KM, Horner SM. WTAP targets the METTL3 m 6 A-methyltransferase complex to cytoplasmic hepatitis C virus RNA to regulate infection. bioRxiv 2022:2022.06.27.497872. [PMID: 35794896 PMCID: PMC9258289 DOI: 10.1101/2022.06.27.497872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
UNLABELLED Modification of the hepatitis C virus (HCV) positive-strand RNA genome by N6-methyladenosine (m 6 A) regulates the viral lifecycle. This lifecycle takes place solely in the cytoplasm, while m 6 A addition on cellular mRNA takes place in the nucleus. Thus, the mechanisms by which m 6 A is deposited on the viral RNA have been unclear. In this work, we find that m 6 A modification of HCV RNA by the m 6 A-methyltransferase proteins METTL3 and METTL14 is regulated by WTAP. WTAP, a predominantly nuclear protein, is an essential member of the cellular mRNA m 6 A-methyltransferase complex and known to target METTL3 to mRNA. We found that HCV infection induces localization of WTAP to the cytoplasm. Importantly, we found that WTAP is required for both METTL3 interaction with HCV RNA and for m 6 A modification across the viral RNA genome. Further, we found that WTAP, like METTL3 and METTL14, negatively regulates the production of infectious HCV virions, a process that we have previously shown is regulated by m 6 A. Excitingly, WTAP regulation of both HCV RNA m 6 A modification and virion production were independent of its ability to localize to the nucleus. Together, these results reveal that WTAP is critical for HCV RNA m 6 A modification by METTL3 and METTL14 in the cytoplasm. IMPORTANCE Positive-strand RNA viruses such as HCV represent a significant global health burden. Previous work has described how HCV RNA contains the RNA modification m 6 A and how this modification regulates viral infection. Yet, how this modification is targeted to HCV RNA has remained unclear due to the incompatibility of the nuclear cellular processes that drive m 6 A modification with the cytoplasmic HCV lifecycle. In this study, we present evidence for how m 6 A modification is targeted to HCV RNA in the cytoplasm by a mechanism in which WTAP recruits the m 6 A-methyltransferase METTL3 to HCV RNA. This targeting strategy for m 6 A modification of cytoplasmic RNA viruses is likely relevant for other m 6 A-modified positive-strand RNA viruses with cytoplasmic lifecycles such as enterovirus 71 and SARS-CoV-2 and provides an exciting new target for potential antiviral therapies.
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Snider DL, Park M, Murphy KA, Beachboard DC, Horner SM. Signaling from the RNA sensor RIG-I is regulated by ufmylation. Proc Natl Acad Sci U S A 2022; 119:e2119531119. [PMID: 35394863 PMCID: PMC9169834 DOI: 10.1073/pnas.2119531119] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 02/28/2022] [Indexed: 01/23/2023] Open
Abstract
The RNA-binding protein RIG-I is a key initiator of the antiviral innate immune response. The signaling that mediates the antiviral response downstream of RIG-I is transduced through the adaptor protein MAVS and results in the induction of type I and III interferons (IFNs). This signal transduction occurs at endoplasmic reticulum (ER)–mitochondrial contact sites, to which RIG-I and other signaling proteins are recruited following their activation. RIG-I signaling is highly regulated to prevent aberrant activation of this pathway and dysregulated induction of IFN. Previously, we identified UFL1, the E3 ligase of the ubiquitin-like modifier conjugation system called ufmylation, as one of the proteins recruited to membranes at ER–mitochondrial contact sites in response to RIG-I activation. Here, we show that UFL1, as well as the process of ufmylation, promote IFN induction in response to RIG-I activation. We found that following RNA virus infection, UFL1 is recruited to the membrane-targeting protein 14–3-3ε and that this complex is then recruited to activated RIG-I to promote downstream innate immune signaling. Importantly, we found that 14–3-3ε has an increase in UFM1 conjugation following RIG-I activation. Additionally, loss of cellular ufmylation prevents the interaction of 14–3-3ε with RIG-I, which abrogates the interaction of RIG-I with MAVS and thus the downstream signal transduction that induces IFN. Our results define ufmylation as an integral regulatory component of the RIG-I signaling pathway and as a posttranslational control for IFN induction.
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Affiliation(s)
- Daltry L. Snider
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710
| | - Moonhee Park
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710
| | - Kristen A. Murphy
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710
| | - Dia C. Beachboard
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710
| | - Stacy M. Horner
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710
- Department of Medicine, Duke University Medical Center, Durham, NC 27710
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11
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Thompson MG, Sacco MT, Horner SM. How RNA modifications regulate the antiviral response. Immunol Rev 2021; 304:169-180. [PMID: 34405413 PMCID: PMC8616813 DOI: 10.1111/imr.13020] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 07/27/2021] [Accepted: 08/05/2021] [Indexed: 12/25/2022]
Abstract
Induction of the antiviral innate immune response is highly regulated at the RNA level, particularly by RNA modifications. Recent discoveries have revealed how RNA modifications play key roles in cellular surveillance of nucleic acids and in controlling gene expression in response to viral infection. These modifications have emerged as being essential for a functional antiviral response and maintaining cellular homeostasis. In this review, we will highlight these and other discoveries that describe how the antiviral response is controlled by modifications to both viral and cellular RNA, focusing on how mRNA cap modifications, N6-methyladenosine, and RNA editing all contribute to coordinating an efficient response that properly controls viral infection.
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Affiliation(s)
- Matthew G Thompson
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC, USA
| | - Matthew T Sacco
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC, USA
| | - Stacy M Horner
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC, USA
- Department of Medicine, Duke University Medical Center, Durham, NC, USA
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12
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McFadden MJ, Sacco MT, Murphy KA, Park M, Gokhale NS, Somfleth KY, Horner SM. FTO Suppresses STAT3 Activation and Modulates Proinflammatory Interferon-Stimulated Gene Expression. J Mol Biol 2021; 434:167247. [PMID: 34537236 PMCID: PMC8924017 DOI: 10.1016/j.jmb.2021.167247] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 09/10/2021] [Accepted: 09/11/2021] [Indexed: 12/14/2022]
Abstract
Signaling initiated by type I interferon (IFN) results in the induction of hundreds of IFN-stimulated genes (ISGs). The type I IFN response is important for antiviral restriction, but aberrant activation of this response can lead to inflammation and autoimmunity. Regulation of this response is incompletely understood. We previously reported that the mRNA modification m6A and its deposition enzymes, METTL3 and METTL14 (METTL3/14), promote the type I IFN response by directly modifying the mRNA of a subset of ISGs to enhance their translation. Here, we determined the role of the RNA demethylase fat mass and obesity-associated protein (FTO) in the type I IFN response. FTO, which can remove either m6A or cap-adjacent m6Am RNA modifications, has previously been associated with obesity and body mass index, type 2 diabetes, cardiovascular disease, and inflammation. We found that FTO suppresses the transcription of a distinct set of ISGs, including many known pro-inflammatory genes, and that this regulation requires its catalytic activity but is not through the actions of FTO on m6Am. Interestingly, depletion of FTO led to activation of the transcription factor STAT3, whose role in the type I IFN response is not well understood. This activation of STAT3 increased the expression of a subset of ISGs. Importantly, this increased ISG induction resulting from FTO depletion was partially ablated by depletion of STAT3. Together, these results reveal that FTO negatively regulates STAT3-mediated signaling that induces proinflammatory ISGs during the IFN response, highlighting an important role for FTO in suppression of inflammatory genes.
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Affiliation(s)
- Michael J McFadden
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA.
| | - Matthew T Sacco
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA.
| | - Kristen A Murphy
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA.
| | - Moonhee Park
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA.
| | - Nandan S Gokhale
- Department of Immunology, University of Washington, Seattle, WA 98109, USA.
| | - Kim Y Somfleth
- Department of Immunology, University of Washington, Seattle, WA 98109, USA.
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA; Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA.
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13
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Snider DL, Horner SM. RNA modification of an RNA modifier prevents self-RNA sensing. PLoS Biol 2021; 19:e3001342. [PMID: 34329302 PMCID: PMC8323910 DOI: 10.1371/journal.pbio.3001342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
This Primer explores a new study in PLOS Biology which finds that interferon-induced ADAR1 mRNA is m6A-modified to promote its translation, enabling ADAR1 to modify self-dsRNAs generated during the interferon response; this prevents recognition of these self RNAs and erroneous activation of the MDA5-mediated host antiviral response.
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Affiliation(s)
- Daltry L. Snider
- Department of Molecular Genetics & Microbiology, Duke University School of Medicine, Durham, North Carolina, United States of America
| | - Stacy M. Horner
- Department of Molecular Genetics & Microbiology, Duke University School of Medicine, Durham, North Carolina, United States of America
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, United States of America
- * E-mail:
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14
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Bechara R, Amatya N, Bailey RD, Li Y, Aggor FEY, Li DD, Jawale CV, Coleman BM, Dai N, Gokhale NS, Taylor TC, Horner SM, Poholek AC, Bansal A, Biswas PS, Gaffen SL. The m 6A reader IMP2 directs autoimmune inflammation through an IL-17- and TNFα-dependent C/EBP transcription factor axis. Sci Immunol 2021; 6:eabd1287. [PMID: 34215679 PMCID: PMC8404281 DOI: 10.1126/sciimmunol.abd1287] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 04/02/2021] [Accepted: 06/03/2021] [Indexed: 12/15/2022]
Abstract
Excessive cytokine activity underlies many autoimmune conditions, particularly through the interleukin-17 (IL-17) and tumor necrosis factor-α (TNFα) signaling axis. Both cytokines activate nuclear factor κB, but appropriate induction of downstream effector genes requires coordinated activation of other transcription factors, notably, CCAAT/enhancer binding proteins (C/EBPs). Here, we demonstrate the unexpected involvement of a posttranscriptional "epitranscriptomic" mRNA modification [N6-methyladenosine (m6A)] in regulating C/EBPβ and C/EBPδ in response to IL-17A, as well as IL-17F and TNFα. Prompted by the observation that C/EBPβ/δ-encoding transcripts contain m6A consensus sites, we show that Cebpd and Cebpb mRNAs are subject to m6A modification. Induction of C/EBPs is enhanced by an m6A methylase "writer" and suppressed by a demethylase "eraser." The only m6A "reader" found to be involved in this pathway was IGF2BP2 (IMP2), and IMP2 occupancy of Cebpd and Cebpb mRNA was enhanced by m6A modification. IMP2 facilitated IL-17-mediated Cebpd mRNA stabilization and promoted translation of C/EBPβ/δ in response to IL-17A, IL-17F, and TNFα. RNA sequencing revealed transcriptome-wide IL-17-induced transcripts that are IMP2 influenced, and RNA immunoprecipitation sequencing identified the subset of mRNAs that are directly occupied by IMP2, which included Cebpb and Cebpd Lipocalin-2 (Lcn2), a hallmark of autoimmune kidney injury, was strongly dependent on IL-17, IMP2, and C/EBPβ/δ. Imp2-/- mice were resistant to autoantibody-induced glomerulonephritis (AGN), showing impaired renal expression of C/EBPs and Lcn2 Moreover, IMP2 deletion initiated only after AGN onset ameliorated disease. Thus, posttranscriptional regulation of C/EBPs through m6A/IMP2 represents a previously unidentified paradigm of cytokine-driven autoimmune inflammation.
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Affiliation(s)
- Rami Bechara
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Nilesh Amatya
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Rachel D Bailey
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Yang Li
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Felix E Y Aggor
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - De-Dong Li
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Chetan V Jawale
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Bianca M Coleman
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Ning Dai
- Diabetes Unit, Massachusetts General Hospital, Boston, MA, USA
| | - Nandan S Gokhale
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, USA
| | - Tiffany C Taylor
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, USA
- Department of Medicine, Duke University Medical Center, Durham, NC, USA
| | - Amanda C Poholek
- Division of Pediatrics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Anita Bansal
- Department of Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Partha S Biswas
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Sarah L Gaffen
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA.
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15
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da Silveira WA, Fazelinia H, Rosenthal SB, Laiakis EC, Kim MS, Meydan C, Kidane Y, Rathi KS, Smith SM, Stear B, Ying Y, Zhang Y, Foox J, Zanello S, Crucian B, Wang D, Nugent A, Costa HA, Zwart SR, Schrepfer S, Elworth RAL, Sapoval N, Treangen T, MacKay M, Gokhale NS, Horner SM, Singh LN, Wallace DC, Willey JS, Schisler JC, Meller R, McDonald JT, Fisch KM, Hardiman G, Taylor D, Mason CE, Costes SV, Beheshti A. Comprehensive Multi-omics Analysis Reveals Mitochondrial Stress as a Central Biological Hub for Spaceflight Impact. Cell 2021; 183:1185-1201.e20. [PMID: 33242417 DOI: 10.1016/j.cell.2020.11.002] [Citation(s) in RCA: 125] [Impact Index Per Article: 41.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 10/01/2020] [Accepted: 11/02/2020] [Indexed: 12/11/2022]
Abstract
Spaceflight is known to impose changes on human physiology with unknown molecular etiologies. To reveal these causes, we used a multi-omics, systems biology analytical approach using biomedical profiles from fifty-nine astronauts and data from NASA's GeneLab derived from hundreds of samples flown in space to determine transcriptomic, proteomic, metabolomic, and epigenetic responses to spaceflight. Overall pathway analyses on the multi-omics datasets showed significant enrichment for mitochondrial processes, as well as innate immunity, chronic inflammation, cell cycle, circadian rhythm, and olfactory functions. Importantly, NASA's Twin Study provided a platform to confirm several of our principal findings. Evidence of altered mitochondrial function and DNA damage was also found in the urine and blood metabolic data compiled from the astronaut cohort and NASA Twin Study data, indicating mitochondrial stress as a consistent phenotype of spaceflight.
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Affiliation(s)
| | - Hossein Fazelinia
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | | | | | - Man S Kim
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Cem Meydan
- Weill Cornell Medical College, New York, NY 10065, USA
| | - Yared Kidane
- Texas Scottish Rite Hospital for Children, Dallas, TX 75219, USA
| | - Komal S Rathi
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | | | - Benjamin Stear
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Yue Ying
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Yuanchao Zhang
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Jonathan Foox
- Weill Cornell Medical College, New York, NY 10065, USA
| | | | | | - Dong Wang
- University of California San Francisco, San Francisco, CA 94115, USA
| | | | | | - Sara R Zwart
- University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Sonja Schrepfer
- University of California San Francisco, San Francisco, CA 94115, USA
| | | | | | | | | | | | | | - Larry N Singh
- Center for Mitochondrial and Epigenomic Medicine, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Douglas C Wallace
- Center for Mitochondrial and Epigenomic Medicine, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA; Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | | | | | - Robert Meller
- Morehouse School of Medicine, Atlanta, GA 30310, USA
| | - J Tyson McDonald
- Georgetown University Medical Center, Washington D.C. 20057, USA
| | | | - Gary Hardiman
- Queens University Belfast, Belfast BT9 5DL, UK; Medical University of South Carolina, Charleston, SC 29425, USA
| | - Deanne Taylor
- The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA; Center for Mitochondrial and Epigenomic Medicine, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA; Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | | | | | - Afshin Beheshti
- KBR, NASA Ames Research Center, Moffett Field, CA 94035, USA.
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16
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McFadden MJ, Horner SM. N 6-Methyladenosine Regulates Host Responses to Viral Infection. Trends Biochem Sci 2021; 46:366-377. [PMID: 33309325 PMCID: PMC8052259 DOI: 10.1016/j.tibs.2020.11.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 11/09/2020] [Accepted: 11/13/2020] [Indexed: 12/11/2022]
Abstract
Recent discoveries have revealed that, during viral infection, the presence of the RNA modification N6-methyladenosine (m6A) on viral and cellular RNAs has profound impacts on infection outcome. Although m6A directly regulates many viral RNA processes, its effects on cellular RNAs and pathways during infection have only recently begun to be elucidated. Disentangling the effects of m6A on viral and host RNAs remains a challenge for the field. m6A has been found to regulate host responses such as viral RNA sensing, cytokine responses, and immune cell functions. We highlight recent findings describing how m6A modulates host responses to viral infection and discuss future directions that will lead to a synergistic understanding of the processes by which m6A regulates viral infection.
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Affiliation(s)
- Michael J McFadden
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA; Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA.
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17
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Bechara R, Amatya N, Bailey RD, Li Y, Aggor FEY, Li DD, Jawale CV, Jawale CV, Coleman BM, Dai N, Gokhale NS, Taylor TC, Horner SM, Poholek AC, Biswas PS, Gaffen SL. RNA m6A methylation guides IL-17-driven autoimmunity through IMP2-dependent regulation of C/EBP transcription factors. The Journal of Immunology 2021. [DOI: 10.4049/jimmunol.206.supp.22.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Abstract
Dysregulated activity of IL-17 underlies many autoimmune conditions, but the molecular mechanisms by which IL-17 mediates pathogenic inflammation remain poorly understood. IL-17 regulates pathogenic inflammatory genes by two key transcription factor classes, NF-κB and CCAAT/Enhancer Binding (C/EBP) proteins. Surprisingly little is known about mechanisms that activate C/EBPs. In seeking to understand how IL-17 upregulates C/EBPs, we found that IL-17 signaling enhanced Cebpd mRNA stability, concomitant with increased levels of C/EBPδ translation. In contrast, IL-17 had only a marginal inductive effect on Cebpb mRNA, yet C/EBPβ protein was strongly upregulated. Examination of Cebpb and Cebpd noncoding sequences identified consensus sites for N6-methyladenosine (m6A) modification, an epitranscriptomic mark that influences mRNA fate. knockdown of the m6A ‘writer’ METTL3 decreased C/EBP expression, which was reversed by the ‘eraser’ FTO. Moreover, we found that loss of an unusual m6A ‘reader’ IGF2BP2 (IMP2), an RNA binding protein known to control mRNA stability, impaired IL-17 induction of C/EBPs. IMP2 bound directly to Cebps transcripts, leading to enhanced Cebpd half-life and enhanced translation of both C/EBPs. Transcriptomic analysis revealed that IMP2 regulates C/EBP-dependent genes, including IL-6 and Lcn2. Lcn2 is a biomarker of autoantibody-induced glomerulonephritis (AGN), a setting of IL-17-driven inflammatory nephritis. Imp2−/− mice were resistant to AGN, which was linked to impaired upregulation of C/EPBs and Lcn2 in kidney. Thus, IL-17-induced autoimmunity is mediated through m6A-dependent post-transcriptional regulation of C/EBP transcription factors.
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Affiliation(s)
| | | | | | - Yang Li
- 1Univ. of Pittsburgh Sch. of Med
| | | | | | | | | | | | - Ning Dai
- 2Diabetes Unit, Massachusetts Gen. Hosp
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18
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McFadden MJ, McIntyre ABR, Mourelatos H, Abell NS, Gokhale NS, Ipas H, Xhemalçe B, Mason CE, Horner SM. Post-transcriptional regulation of antiviral gene expression by N6-methyladenosine. Cell Rep 2021; 34:108798. [PMID: 33657363 PMCID: PMC7981787 DOI: 10.1016/j.celrep.2021.108798] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 12/18/2020] [Accepted: 02/05/2021] [Indexed: 02/07/2023] Open
Abstract
Type I interferons (IFNs) induce hundreds of IFN-stimulated genes (ISGs) in response to viral infection. Induction of these ISGs must be regulated for an efficient and controlled antiviral response, but post-transcriptional controls of these genes have not been well defined. Here, we identify a role for the RNA base modification N6-methyladenosine (m6A) in the regulation of ISGs. Using ribosome profiling and quantitative mass spectrometry, coupled with m6A-immunoprecipitation and sequencing, we identify a subset of ISGs, including IFITM1, whose translation is enhanced by m6A and the m6A methyltransferase proteins METTL3 and METTL14. We further determine that the m6A reader YTHDF1 increases the expression of IFITM1 in an m6A-binding-dependent manner. Importantly, we find that the m6A methyltransferase complex promotes the antiviral activity of type I IFN. Thus, these studies identify m6A as having a role in post-transcriptional control of ISG translation during the type I IFN response for antiviral restriction.
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Affiliation(s)
- Michael J McFadden
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Alexa B R McIntyre
- Department of Physiology and Biophysics, Weill Cornell Medicine, New York, NY 10021, USA; Tri-Institutional Program in Computational Biology and Medicine, New York, NY 10021, USA
| | - Haralambos Mourelatos
- Weill Cornell/Rockefeller/Memorial Sloan Kettering Tri-Institutional MD-PhD Program, New York, NY 10021, USA
| | - Nathan S Abell
- Department of Molecular Biosciences, University of Texas at Austin, Austin, TX 78712, USA; Department of Genetics, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA 94305-5324, USA
| | - Nandan S Gokhale
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Hélène Ipas
- Department of Molecular Biosciences, University of Texas at Austin, Austin, TX 78712, USA
| | - Blerta Xhemalçe
- Department of Molecular Biosciences, University of Texas at Austin, Austin, TX 78712, USA
| | - Christopher E Mason
- Department of Physiology and Biophysics, Weill Cornell Medicine, New York, NY 10021, USA; Tri-Institutional Program in Computational Biology and Medicine, New York, NY 10021, USA; The HRH Prince Alwaleed Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, Weill Cornell Medicine, New York, NY 10021, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA; Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA.
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19
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Sacco MT, Horner SM. Flipping the script: viral capitalization of RNA modifications. Brief Funct Genomics 2021; 20:86-93. [PMID: 33401298 DOI: 10.1093/bfgp/elaa025] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 12/01/2020] [Accepted: 12/03/2020] [Indexed: 02/07/2023] Open
Abstract
RNA encoded by RNA viruses is highly regulated so that it can function in multiple roles during the viral life cycle. These roles include serving as the mRNA template for translation or the genetic material for replication as well as being packaged into progeny virions. RNA modifications provide an emerging regulatory dimension to the RNA of viruses. Modification of the viral RNA can increase the functional genomic capacity of the RNA viruses without the need to encode and translate additional genes. Further, RNA modifications can facilitate interactions with host or viral RNA-binding proteins that promote replication or can prevent interactions with antiviral RNA-binding proteins. The mechanisms by which RNA viruses facilitate modification of their RNA are diverse. In this review, we discuss some of these mechanisms, including exploring the unknown mechanism by which the RNA of viruses that replicate in the cytoplasm could acquire the RNA modification N6-methyladenosine.
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20
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Price AM, Hayer KE, McIntyre ABR, Gokhale NS, Abebe JS, Della Fera AN, Mason CE, Horner SM, Wilson AC, Depledge DP, Weitzman MD. Direct RNA sequencing reveals m 6A modifications on adenovirus RNA are necessary for efficient splicing. Nat Commun 2020; 11:6016. [PMID: 33243990 PMCID: PMC7691994 DOI: 10.1038/s41467-020-19787-6] [Citation(s) in RCA: 95] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 10/09/2020] [Indexed: 12/20/2022] Open
Abstract
Adenovirus is a nuclear replicating DNA virus reliant on host RNA processing machinery. Processing and metabolism of cellular RNAs can be regulated by METTL3, which catalyzes the addition of N6-methyladenosine (m6A) to mRNAs. While m6A-modified adenoviral RNAs have been previously detected, the location and function of this mark within the infectious cycle is unknown. Since the complex adenovirus transcriptome includes overlapping spliced units that would impede accurate m6A mapping using short-read sequencing, here we profile m6A within the adenovirus transcriptome using a combination of meRIP-seq and direct RNA long-read sequencing to yield both nucleotide and transcript-resolved m6A detection. Although both early and late viral transcripts contain m6A, depletion of m6A writer METTL3 specifically impacts viral late transcripts by reducing their splicing efficiency. These data showcase a new technique for m6A discovery within individual transcripts at nucleotide resolution, and highlight the role of m6A in regulating splicing of a viral pathogen.
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Affiliation(s)
- Alexander M Price
- Division of Protective Immunity and Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | - Katharina E Hayer
- Department of Biomedical and Health Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | - Alexa B R McIntyre
- Department of Physiology and Biophysics, Weill Cornell Medicine, New York, NY, 10065, USA
- Tri-Institutional Program in Computational Biology and Medicine, New York, NY, 10065, USA
- Department of Molecular Life Sciences, University of Zurich, 8006, Zurich, Switzerland
| | - Nandan S Gokhale
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, 27710, USA
- Department of Immunology, University of Washington, Seattle, WA, 98115, USA
| | - Jonathan S Abebe
- Department of Medicine, New York University School of Medicine, New York, NY, 10017, USA
| | - Ashley N Della Fera
- Division of Protective Immunity and Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA
- Biological Sciences Graduate Group, University of Maryland, College Park, MD, 20742, USA
| | - Christopher E Mason
- Department of Physiology and Biophysics, Weill Cornell Medicine, New York, NY, 10065, USA
- The HRH Prince Alwaleed Bin Talal Abdulaziz Alsaud Institute for Computational Biomedicine, Weill Cornell Medicine, New York, NY, 10065, USA
- The World Quant Initiative for Quantitative Prediction, Weill Cornell Medicine, New York, NY, 10065, USA
- The Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY, 10065, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, 27710, USA
- Department of Medicine, Duke University Medical Center, Durham, NC, 27710, USA
| | - Angus C Wilson
- Department of Microbiology, New York University School of Medicine, New York, NY, 10017, USA
| | - Daniel P Depledge
- Department of Medicine, New York University School of Medicine, New York, NY, 10017, USA.
| | - Matthew D Weitzman
- Division of Protective Immunity and Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, USA.
- Department of Pathology and Laboratory Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19104, USA.
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21
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Williams GD, Gokhale NS, Snider DL, Horner SM. The mRNA Cap 2'- O-Methyltransferase CMTR1 Regulates the Expression of Certain Interferon-Stimulated Genes. mSphere 2020; 5:e00202-20. [PMID: 32404510 PMCID: PMC7227766 DOI: 10.1128/msphere.00202-20] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 04/29/2020] [Indexed: 02/06/2023] Open
Abstract
Type I interferons (IFN) initiate an antiviral state through a signal transduction cascade that leads to the induction of hundreds of IFN-stimulated genes (ISGs) to restrict viral infection. Recently, RNA modifications on both host and viral RNAs have been described as regulators of infection. However, the impact of host mRNA cap modifications on the IFN response and how this regulates viral infection are unknown. Here, we reveal that CMTR1, an ISG that catalyzes 2'-O-methylation of the first transcribed nucleotide in cellular mRNA (Cap 1), promotes the protein expression of specific ISGs that contribute to the antiviral response. Depletion of CMTR1 reduces the IFN-induced protein levels of ISG15, MX1, and IFITM1, without affecting their transcript abundance. However, CMTR1 depletion does not significantly affect the IFN-induced protein or transcript abundance of IFIT1 and IFIT3. Importantly, knockdown of IFIT1, which acts with IFIT3 to inhibit the translation of RNAs lacking Cap 1 2'-O-methylation, restores protein expression of ISG15, MX1, and IFITM1 in cells depleted of CMTR1. Finally, we found that CMTR1 plays a role in restricting RNA virus replication, likely by ensuring the expression of specific antiviral ISGs. Taken together, these data reveal that CMTR1 is required to establish an antiviral state by ensuring the protein expression of a subset of ISGs during the type I IFN response.IMPORTANCE Induction of an efficient type I IFN response is important to control viral infection. We show that the host 2'-O-methyltransferase CMTR1 facilitates the protein expression of ISGs in human cells by preventing IFIT1 from inhibiting the translation of those mRNAs lacking cap 2'-O-methylation. Thus, CMTR1 promotes the IFN-mediated antiviral response.
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Affiliation(s)
- Graham D Williams
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, USA
| | - Nandan S Gokhale
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, USA
| | - Daltry L Snider
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, USA
- Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
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22
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Butler DJ, Mozsary C, Meydan C, Danko D, Foox J, Rosiene J, Shaiber A, Afshinnekoo E, MacKay M, Sedlazeck FJ, Ivanov NA, Sierra M, Pohle D, Zietz M, Gisladottir U, Ramlall V, Westover CD, Ryon K, Young B, Bhattacharya C, Ruggiero P, Langhorst BW, Tanner N, Gawrys J, Meleshko D, Xu D, Steel PAD, Shemesh AJ, Xiang J, Thierry-Mieg J, Thierry-Mieg D, Schwartz RE, Iftner A, Bezdan D, Sipley J, Cong L, Craney A, Velu P, Melnick AM, Hajirasouliha I, Horner SM, Iftner T, Salvatore M, Loda M, Westblade LF, Cushing M, Levy S, Wu S, Tatonetti N, Imielinski M, Rennert H, Mason CE. Shotgun Transcriptome and Isothermal Profiling of SARS-CoV-2 Infection Reveals Unique Host Responses, Viral Diversification, and Drug Interactions. bioRxiv 2020:2020.04.20.048066. [PMID: 32511352 PMCID: PMC7255793 DOI: 10.1101/2020.04.20.048066] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) has caused thousands of deaths worldwide, including >18,000 in New York City (NYC) alone. The sudden emergence of this pandemic has highlighted a pressing clinical need for rapid, scalable diagnostics that can detect infection, interrogate strain evolution, and identify novel patient biomarkers. To address these challenges, we designed a fast (30-minute) colorimetric test (LAMP) for SARS-CoV-2 infection from naso/oropharyngeal swabs, plus a large-scale shotgun metatranscriptomics platform (total-RNA-seq) for host, bacterial, and viral profiling. We applied both technologies across 857 SARS-CoV-2 clinical specimens and 86 NYC subway samples, providing a broad molecular portrait of the COVID-19 NYC outbreak. Our results define new features of SARS-CoV-2 evolution, nominate a novel, NYC-enriched viral subclade, reveal specific host responses in interferon, ACE, hematological, and olfaction pathways, and examine risks associated with use of ACE inhibitors and angiotensin receptor blockers. Together, these findings have immediate applications to SARS-CoV-2 diagnostics, public health, and new therapeutic targets.
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Affiliation(s)
- Daniel J. Butler
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
| | | | - Cem Meydan
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
- The HRH Prince Alwaleed Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, Weill Cornell Medicine, NY, USA
- WorldQuant Initiative for Quantitative Prediction, Weill Cornell Medicine, NY, USA
| | - David Danko
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
- Tri-Institutional Computational Biol. & Medicine Program, Weill Cornell Medicine, NY, USA
| | - Jonathan Foox
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
- The HRH Prince Alwaleed Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, Weill Cornell Medicine, NY, USA
| | - Joel Rosiene
- New York Genome Center, NY, USA
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
| | - Alon Shaiber
- New York Genome Center, NY, USA
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
- Englander Institute for Precision Medicine and the Meyer Cancer Center, Weill Cornell Medicine, NY, USA
| | - Ebrahim Afshinnekoo
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
- The HRH Prince Alwaleed Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, Weill Cornell Medicine, NY, USA
- WorldQuant Initiative for Quantitative Prediction, Weill Cornell Medicine, NY, USA
| | - Matthew MacKay
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
| | - Fritz J. Sedlazeck
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX, USA
| | - Nikolay A. Ivanov
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
- The HRH Prince Alwaleed Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, Weill Cornell Medicine, NY, USA
- Clinical & Translational Science Center, Weill Cornell Medicine, NY, USA
| | - Maria Sierra
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
| | - Diana Pohle
- Institute of Medical Virology and Epidemiology of Viral Diseases, University Hospital Tuebingen, Germany
| | - Michael Zietz
- Department of Biomedical Informatics, Department of Systems Biology, Department of Medicine, Institute for Genomic Medicine, Columbia University, NY, USA
| | - Undina Gisladottir
- Department of Biomedical Informatics, Department of Systems Biology, Department of Medicine, Institute for Genomic Medicine, Columbia University, NY, USA
| | - Vijendra Ramlall
- Department of Biomedical Informatics, Department of Systems Biology, Department of Medicine, Institute for Genomic Medicine, Columbia University, NY, USA
- Department of Cellular, Molecular Physiology & Biophysics, Columbia University, NY, USA
| | - Craig D. Westover
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
| | - Krista Ryon
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
| | - Benjamin Young
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
| | | | - Phyllis Ruggiero
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
| | | | | | - Justyna Gawrys
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
| | - Dmitry Meleshko
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
- Tri-Institutional Computational Biol. & Medicine Program, Weill Cornell Medicine, NY, USA
| | - Dong Xu
- Genomics Resources Core Facility, Weill Cornell Medicine, NY, USA
| | | | - Amos J. Shemesh
- Department of Emergency Medicine, Weill Cornell Medicine, NY, USA
| | - Jenny Xiang
- Genomics Resources Core Facility, Weill Cornell Medicine, NY, USA
- Division of Infectious Diseases, Department of Medicine, Weill Cornell Medicine, NY, USA
| | - Jean Thierry-Mieg
- National Center for Biotechnology Information, National Library of Medicine, National Institute of Health, MD, USA
| | - Danielle Thierry-Mieg
- National Center for Biotechnology Information, National Library of Medicine, National Institute of Health, MD, USA
| | | | - Angelika Iftner
- Institute of Medical Virology and Epidemiology of Viral Diseases, University Hospital Tuebingen, Germany
| | - Daniela Bezdan
- Institute of Medical Virology and Epidemiology of Viral Diseases, University Hospital Tuebingen, Germany
| | - John Sipley
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
| | - Lin Cong
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
| | - Arryn Craney
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
| | - Priya Velu
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
| | | | - Iman Hajirasouliha
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
- The HRH Prince Alwaleed Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, Weill Cornell Medicine, NY, USA
- Englander Institute for Precision Medicine and the Meyer Cancer Center, Weill Cornell Medicine, NY, USA
| | - Stacy M. Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, NC, USA
- Department of Medicine, Duke University Medical Center, NC, USA
| | - Thomas Iftner
- Institute of Medical Virology and Epidemiology of Viral Diseases, University Hospital Tuebingen, Germany
| | - Mirella Salvatore
- Division of Infectious Diseases, Department of Medicine, Weill Cornell Medicine, NY, USA
| | - Massimo Loda
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
| | - Lars F. Westblade
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
- Division of Infectious Diseases, Department of Medicine, Weill Cornell Medicine, NY, USA
| | - Melissa Cushing
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
| | - Shawn Levy
- HudsonAlpha Discovery Institute, Huntsville, AL, USA
| | - Shixiu Wu
- Hangzhou Cancer Institute, Hangzhou Cancer Hospital, Hangzhou, China
- Department of Radiation Oncology, Hangzhou Cancer Hospital, Hangzhou, China
| | - Nicholas Tatonetti
- Department of Biomedical Informatics, Department of Systems Biology, Department of Medicine, Institute for Genomic Medicine, Columbia University, NY, USA
| | - Marcin Imielinski
- New York Genome Center, NY, USA
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
- Englander Institute for Precision Medicine and the Meyer Cancer Center, Weill Cornell Medicine, NY, USA
| | - Hanna Rennert
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, NY, USA
| | - Christopher E. Mason
- Department of Physiology and Biophysics, Weill Cornell Medicine, NY, USA
- The HRH Prince Alwaleed Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, Weill Cornell Medicine, NY, USA
- WorldQuant Initiative for Quantitative Prediction, Weill Cornell Medicine, NY, USA
- The Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, NY, USA
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23
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McIntyre ABR, Gokhale NS, Cerchietti L, Jaffrey SR, Horner SM, Mason CE. Limits in the detection of m 6A changes using MeRIP/m 6A-seq. Sci Rep 2020; 10:6590. [PMID: 32313079 PMCID: PMC7170965 DOI: 10.1038/s41598-020-63355-3] [Citation(s) in RCA: 112] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Accepted: 03/19/2020] [Indexed: 12/15/2022] Open
Abstract
Many cellular mRNAs contain the modified base m6A, and recent studies have suggested that various stimuli can lead to changes in m6A. The most common method to map m6A and to predict changes in m6A between conditions is methylated RNA immunoprecipitation sequencing (MeRIP-seq), through which methylated regions are detected as peaks in transcript coverage from immunoprecipitated RNA relative to input RNA. Here, we generated replicate controls and reanalyzed published MeRIP-seq data to estimate reproducibility across experiments. We found that m6A peak overlap in mRNAs varies from ~30 to 60% between studies, even in the same cell type. We then assessed statistical methods to detect changes in m6A peaks as distinct from changes in gene expression. However, from these published data sets, we detected few changes under most conditions and were unable to detect consistent changes across studies of similar stimuli. Overall, our work identifies limits to MeRIP-seq reproducibility in the detection both of peaks and of peak changes and proposes improved approaches for analysis of peak changes.
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Affiliation(s)
- Alexa B R McIntyre
- Department of Physiology and Biophysics, Weill Cornell Medicine, New York City, NY, 10065, USA.
- Tri-Institutional Program in Computational Biology and Medicine, New York City, NY, 10065, USA.
| | - Nandan S Gokhale
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, 27710, USA
| | - Leandro Cerchietti
- Division of Hematology and Medical Oncology, Weill Cornell Medicine, New York City, NY, 10065, USA
| | - Samie R Jaffrey
- Department of Pharmacology, Weill Cornell Medicine, New York City, NY, 10065, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, 27710, USA.
- Department of Medicine, Duke University Medical Center, Durham, NC, 27710, USA.
| | - Christopher E Mason
- Department of Physiology and Biophysics, Weill Cornell Medicine, New York City, NY, 10065, USA.
- The HRH Prince Alwaleed Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, Weill Cornell Medicine, New York, NY, 10021, USA.
- The Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY, 10065, USA.
- The WorldQuant Initiative for Quantitative Prediction, Weill Cornell Medicine, New York, NY, 10021, USA.
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24
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Kwock JT, Handfield C, Suwanpradid J, Hoang P, McFadden MJ, Labagnara KF, Floyd L, Shannon J, Uppala R, Sarkar MK, Gudjonsson JE, Corcoran DL, Lazear HM, Sempowski G, Horner SM, MacLeod AS. IL-27 signaling activates skin cells to induce innate antiviral proteins and protects against Zika virus infection. Sci Adv 2020; 6:eaay3245. [PMID: 32270034 PMCID: PMC7112749 DOI: 10.1126/sciadv.aay3245] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Accepted: 01/08/2020] [Indexed: 05/13/2023]
Abstract
In the skin, antiviral proteins and other immune molecules serve as the first line of innate antiviral defense. Here, we identify and characterize the induction of cutaneous innate antiviral proteins in response to IL-27 and its functional role during cutaneous defense against Zika virus infection. Transcriptional and phenotypic profiling of epidermal keratinocytes treated with IL-27 demonstrated activation of antiviral proteins OAS1, OAS2, OASL, and MX1 in the skin of both mice and humans. IL-27-mediated antiviral protein induction was found to occur in a STAT1- and IRF3-dependent but STAT2-independent manner. Moreover, using IL27ra mice, we demonstrate a significant role for IL-27 in inhibiting Zika virus morbidity and mortality following cutaneous, but not intravenous, inoculation. Together, our results demonstrate a critical and previously unrecognized role for IL-27 in cutaneous innate antiviral immunity against Zika virus.
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Affiliation(s)
- Jeffery T. Kwock
- Department of Dermatology, Duke University Medical Center, Durham, NC 27710, USA
| | - Chelsea Handfield
- Department of Dermatology, Duke University Medical Center, Durham, NC 27710, USA
| | - Jutamas Suwanpradid
- Department of Dermatology, Duke University Medical Center, Durham, NC 27710, USA
| | - Peter Hoang
- Department of Dermatology, Duke University Medical Center, Durham, NC 27710, USA
| | - Michael J. McFadden
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Kevin F. Labagnara
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Lauren Floyd
- Department of Dermatology, Duke University Medical Center, Durham, NC 27710, USA
| | - Jessica Shannon
- Department of Dermatology, Duke University Medical Center, Durham, NC 27710, USA
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA
| | - Ranjitha Uppala
- Department of Dermatology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Mrinal K. Sarkar
- Department of Dermatology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Johann E. Gudjonsson
- Department of Dermatology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - David L. Corcoran
- Duke Center for Genomic and Computational Biology, Duke University Medical Center, Durham, NC 27710, USA
| | - Helen M. Lazear
- Department of Microbiology and Immunology, University of North Carolina School of Medicine, Chapel Hill, NC 27516, USA
| | - Gregory Sempowski
- Duke Human Vaccine Institute, Duke University School of Medicine, Durham, NC 27710, USA
- Duke Global Health Institute, Duke University School of Medicine, Durham, NC 27705, USA
| | - Stacy M. Horner
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Amanda S. MacLeod
- Department of Dermatology, Duke University Medical Center, Durham, NC 27710, USA
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710, USA
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA
- Corresponding author.
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25
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Gokhale NS, McIntyre ABR, Mattocks MD, Holley CL, Lazear HM, Mason CE, Horner SM. Altered m 6A Modification of Specific Cellular Transcripts Affects Flaviviridae Infection. Mol Cell 2020; 77:542-555.e8. [PMID: 31810760 PMCID: PMC7007864 DOI: 10.1016/j.molcel.2019.11.007] [Citation(s) in RCA: 111] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 10/11/2019] [Accepted: 10/29/2019] [Indexed: 02/07/2023]
Abstract
The RNA modification N6-methyladenosine (m6A) modulates mRNA fate and thus affects many biological processes. We analyzed m6A across the transcriptome following infection by dengue virus (DENV), Zika virus (ZIKV), West Nile virus (WNV), and hepatitis C virus (HCV). We found that infection by these viruses in the Flaviviridae family alters m6A modification of specific cellular transcripts, including RIOK3 and CIRBP. During viral infection, the addition of m6A to RIOK3 promotes its translation, while loss of m6A in CIRBP promotes alternative splicing. Importantly, viral activation of innate immune sensing or the endoplasmic reticulum (ER) stress response contributes to the changes in m6A in RIOK3 or CIRBP, respectively. Further, several transcripts with infection-altered m6A profiles, including RIOK3 and CIRBP, encode proteins that influence DENV, ZIKV, and HCV infection. Overall, this work reveals that cellular signaling pathways activated during viral infection lead to alterations in m6A modification of host mRNAs to regulate infection.
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Affiliation(s)
- Nandan S Gokhale
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27705, USA
| | - Alexa B R McIntyre
- Department of Physiology and Biophysics and the Institute for Computational Biomedicine, Weill Cornell Medicine, New York, NY 10065, USA; Tri-Institutional Program in Computational Biology and Medicine, New York, NY 10065, USA
| | - Melissa D Mattocks
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Christopher L Holley
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27705, USA; Department of Medicine, Duke University Medical Center, Durham, NC 27705, USA
| | - Helen M Lazear
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Christopher E Mason
- Department of Physiology and Biophysics and the Institute for Computational Biomedicine, Weill Cornell Medicine, New York, NY 10065, USA; The HRH Prince Alwaleed Bin Talal Abdulaziz Alsaud Institute for Computational Biomedicine, Weill Cornell Medicine, New York, NY 10065, USA; The WorldQuant Initiative for Quantitative Prediction, Weill Cornell Medicine, New York, NY 10065, USA; The Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY 10065, USA.
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27705, USA; Department of Medicine, Duke University Medical Center, Durham, NC 27705, USA.
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26
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Vazquez C, Tan CY, Horner SM. Hepatitis C Virus Infection Is Inhibited by a Noncanonical Antiviral Signaling Pathway Targeted by NS3-NS4A. J Virol 2019; 93:e00725-19. [PMID: 31534039 PMCID: PMC6854490 DOI: 10.1128/jvi.00725-19] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 09/16/2019] [Indexed: 12/30/2022] Open
Abstract
The hepatitis C virus (HCV) NS3-NS4A protease complex is required for viral replication and is the major viral innate immune evasion factor. NS3-NS4A evades antiviral innate immunity by inactivating several proteins, including MAVS, the signaling adaptor for RIG-I and MDA5, and Riplet, an E3 ubiquitin ligase that activates RIG-I. Here, we identified a Tyr-16-Phe (Y16F) change in the NS4A transmembrane domain that prevents NS3-NS4A targeting of Riplet but not MAVS. This Y16F substitution reduces HCV replication in Huh7 cells, but not in Huh-7.5 cells, known to lack RIG-I signaling. Surprisingly, deletion of RIG-I in Huh7 cells did not restore Y16F viral replication. Rather, we found that Huh-7.5 cells lack Riplet expression and that the addition of Riplet to these cells reduced HCV Y16F replication, whereas the addition of Riplet lacking the RING domain restored HCV Y16F replication. In addition, TBK1 inhibition or IRF3 deletion in Huh7 cells was sufficient to restore HCV Y16F replication, and the Y16F protease lacked the ability to prevent IRF3 activation or interferon induction. Taken together, these data reveal that the NS4A Y16 residue regulates a noncanonical Riplet-TBK1-IRF3-dependent, but RIG-I-MAVS-independent, signaling pathway that limits HCV infection.IMPORTANCE The HCV NS3-NS4A protease complex facilitates viral replication by cleaving and inactivating the antiviral innate immune signaling proteins MAVS and Riplet, which are essential for RIG-I activation. NS3-NS4A therefore prevents IRF3 activation and interferon induction during HCV infection. Here, we uncover an amino acid residue within the NS4A transmembrane domain that is essential for inactivation of Riplet but does not affect MAVS cleavage by NS3-NS4A. Our study reveals that Riplet is involved in a RIG-I- and MAVS-independent signaling pathway that activates IRF3 and that this pathway is normally inactivated by NS3-NS4A during HCV infection. Our study selectively uncouples these distinct regulatory mechanisms within NS3-NS4A and defines a new role for Riplet in the antiviral response to HCV. Since Riplet is known to be inhibited by other RNA viruses, such as such influenza A virus, this innate immune signaling pathway may also be important in controlling other RNA virus infections.
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Affiliation(s)
- Christine Vazquez
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, USA
| | - Chin Yee Tan
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, USA
- Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
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27
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Beachboard DC, Park M, Vijayan M, Snider DL, Fernando DJ, Williams GD, Stanley S, McFadden MJ, Horner SM. The small GTPase RAB1B promotes antiviral innate immunity by interacting with TNF receptor-associated factor 3 (TRAF3). J Biol Chem 2019; 294:14231-14240. [PMID: 31375559 PMCID: PMC6768648 DOI: 10.1074/jbc.ra119.007917] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 07/25/2019] [Indexed: 12/24/2022] Open
Abstract
Innate immune detection of viral nucleic acids during viral infection activates a signaling cascade that induces type I and type III IFNs as well as other cytokines, to generate an antiviral response. This signaling is initiated by pattern recognition receptors, such as the RNA helicase retinoic acid-inducible gene I (RIG-I), that sense viral RNA. These sensors then interact with the adaptor protein mitochondrial antiviral signaling protein (MAVS), which recruits additional signaling proteins, including TNF receptor-associated factor 3 (TRAF3) and TANK-binding kinase 1 (TBK1), to form a signaling complex that activates IFN regulatory factor 3 (IRF3) for transcriptional induction of type I IFNs. Here, using several immunological and biochemical approaches in multiple human cell types, we show that the GTPase-trafficking protein RAB1B up-regulates RIG-I pathway signaling and thereby promotes IFN-β induction and the antiviral response. We observed that RAB1B overexpression increases RIG-I-mediated signaling to IFN-β and that RAB1B deletion reduces signaling of this pathway. Additionally, loss of RAB1B dampened the antiviral response, indicated by enhanced Zika virus infection of cells depleted of RAB1B. Importantly, we identified the mechanism of RAB1B action in the antiviral response, finding that it forms a protein complex with TRAF3 to facilitate the interaction of TRAF3 with mitochondrial antiviral signaling protein. We conclude that RAB1B regulates TRAF3 and promotes the formation of innate immune signaling complexes in response to nucleic acid sensing during RNA virus infection.
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Affiliation(s)
- Dia C Beachboard
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710
| | - Moonhee Park
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710
| | - Madhuvanthi Vijayan
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710
| | - Daltry L Snider
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710
| | - Dillon J Fernando
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710
| | - Graham D Williams
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710
| | - Sydney Stanley
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710
| | - Michael J McFadden
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710
- Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710
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28
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Abstract
In recent years, the RNA modification N6-methyladenosine (m6A) has been found to play a role in the life cycles of numerous viruses and also in the cellular response to viral infection. m6A has emerged as a regulator of many fundamental aspects of RNA biology. Here, we highlight recent advances in techniques for the study of m6A, as well as advances in our understanding of the cellular machinery that controls the addition, removal, recognition, and functions of m6A. We then summarize the many newly discovered roles of m6A during viral infection, including how it regulates innate and adaptive immune responses to infection. Overall, the goals of this review are to summarize the roles of m6A on both cellular and viral RNAs and to describe future directions for uncovering new functions of m6A during infection.
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Affiliation(s)
- Graham D Williams
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710, USA; , ,
| | - Nandan S Gokhale
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710, USA; , ,
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710, USA; , , .,Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710, USA
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29
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Roder AE, Vazquez C, Horner SM. The acidic domain of the hepatitis C virus NS4A protein is required for viral assembly and envelopment through interactions with the viral E1 glycoprotein. PLoS Pathog 2019; 15:e1007163. [PMID: 30730994 PMCID: PMC6382253 DOI: 10.1371/journal.ppat.1007163] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 02/20/2019] [Accepted: 01/05/2019] [Indexed: 02/07/2023] Open
Abstract
Hepatitis C virus (HCV) assembly and envelopment are coordinated by a complex protein interaction network that includes most of the viral structural and nonstructural proteins. While the nonstructural protein 4A (NS4A) is known to be important for viral particle production, the specific function of NS4A in this process is not well understood. We performed mutagenesis of the C-terminal acidic domain of NS4A and found that mutation of several of these amino acids prevented the formation of the viral envelope, and therefore the production of infectious virions, without affecting viral RNA replication. In an overexpression system, we found that NS4A interacted with several viral proteins known to coordinate envelopment, including the viral E1 glycoprotein. One of the NS4A C-terminal mutations, Y45F, disrupted the interaction of NS4A with E1. Specifically, NS4A interacted with the first hydrophobic region of E1, a region previously described as regulating viral particle production. Indeed, we found that an E1 mutation in this region, D72A, also disrupted the interaction of NS4A with E1. Supernatants from HCV NS4A Y45F transfected cells had significantly reduced levels of HCV RNA, however they contained equivalent levels of Core protein. Interestingly, the Core protein secreted from these cells formed high order oligomers with a density matching the infectious virus secreted from wild-type cells. These results suggest that this Y45F mutation in NS4A causes secretion of low-density Core particles lacking genomic HCV RNA. These results corroborate previous findings showing that the E1 D72A mutation also causes secretion of Core complexes lacking genomic HCV RNA, and therefore suggest that the interaction between NS4A and E1 is involved in the incorporation of viral RNA into infectious HCV particles. Our findings define a new role for NS4A in the HCV lifecycle and help elucidate the protein interactions necessary for production of infectious virus.
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Affiliation(s)
- Allison E Roder
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC, United States of America
| | - Christine Vazquez
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC, United States of America
| | - Stacy M Horner
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC, United States of America
- Department of Medicine, Duke University Medical Center, Durham, NC, United States of America
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30
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Abstract
The infectious virion of hepatitis C virus (HCV) is made up of the viral nucleocapsid surrounded by an envelope that contains an ER-derived membrane bilayer, cellular lipids, and the viral E1 and E2 glycoproteins. Because the infectious HCV particle contains both protein and lipid layers, selective disruption of these layers and analysis for the presence or absence of resulting virion components can be used to study the virion assembly process. This chapter describes an experimental method to measure HCV virion envelopment, which can reveal the mechanisms of how specific viral protein-protein interactions and host factors contribute to the process of HCV envelopment.
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Affiliation(s)
- Allison E Roder
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, USA.
- Department of Medicine, Duke University Medical Center, Durham, NC, USA.
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31
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Wang L, Pittman KJ, Barker JR, Salinas RE, Stanaway IB, Williams GD, Carroll RJ, Balmat T, Ingham A, Gopalakrishnan AM, Gibbs KD, Antonia AL, Heitman J, Lee SC, Jarvik GP, Denny JC, Horner SM, DeLong MR, Valdivia RH, Crosslin DR, Ko DC. An Atlas of Genetic Variation Linking Pathogen-Induced Cellular Traits to Human Disease. Cell Host Microbe 2018; 24:308-323.e6. [PMID: 30092202 PMCID: PMC6093297 DOI: 10.1016/j.chom.2018.07.007] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 05/28/2018] [Accepted: 07/05/2018] [Indexed: 12/18/2022]
Abstract
Pathogens have been a strong driving force for natural selection. Therefore, understanding how human genetic differences impact infection-related cellular traits can mechanistically link genetic variation to disease susceptibility. Here we report the Hi-HOST Phenome Project (H2P2): a catalog of cellular genome-wide association studies (GWAS) comprising 79 infection-related phenotypes in response to 8 pathogens in 528 lymphoblastoid cell lines. Seventeen loci surpass genome-wide significance for infection-associated phenotypes ranging from pathogen replication to cytokine production. We combined H2P2 with clinical association data from patients to identify a SNP near CXCL10 as a risk factor for inflammatory bowel disease. A SNP in the transcriptional repressor ZBTB20 demonstrated pleiotropy, likely through suppression of multiple target genes, and was associated with viral hepatitis. These data are available on a web portal to facilitate interpreting human genome variation through the lens of cell biology and should serve as a rich resource for the research community.
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Affiliation(s)
- Liuyang Wang
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA
| | - Kelly J Pittman
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA
| | - Jeffrey R Barker
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA
| | - Raul E Salinas
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA
| | - Ian B Stanaway
- Department of Biomedical Informatics and Medical Education, School of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Graham D Williams
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA
| | - Robert J Carroll
- Department of Biomedical Informatics, School of Medicine, Vanderbilt University, Nashville, TN 37212, USA
| | - Tom Balmat
- Social Science Research Institute, Duke University, Durham, NC 27710, USA
| | - Andy Ingham
- Duke Research Computing, Duke University, Durham, NC 27710, USA
| | - Anusha M Gopalakrishnan
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA
| | - Kyle D Gibbs
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA
| | - Alejandro L Antonia
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA
| | - Joseph Heitman
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA; Division of Infectious Diseases, Department of Medicine, School of Medicine, Duke University, Durham, NC 27710, USA
| | - Soo Chan Lee
- South Texas Center for Emerging Infectious Diseases (STCEID), Department of Biology, College of Sciences, the University of Texas at San Antonio, San Antonio, TX 78249, USA
| | - Gail P Jarvik
- Department of Medicine, Division of Medical Genetics, School of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Joshua C Denny
- Department of Biomedical Informatics, School of Medicine, Vanderbilt University, Nashville, TN 37212, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA; Division of Infectious Diseases, Department of Medicine, School of Medicine, Duke University, Durham, NC 27710, USA
| | - Mark R DeLong
- Duke Research Computing, Duke University, Durham, NC 27710, USA
| | - Raphael H Valdivia
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA
| | - David R Crosslin
- Department of Biomedical Informatics and Medical Education, School of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Dennis C Ko
- Department of Molecular Genetics and Microbiology, School of Medicine, Duke University, Durham, NC 27710, USA; Division of Infectious Diseases, Department of Medicine, School of Medicine, Duke University, Durham, NC 27710, USA.
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32
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Liu B, Merriman DK, Choi SH, Schumacher MA, Plangger R, Kreutz C, Horner SM, Meyer KD, Al-Hashimi HM. A potentially abundant junctional RNA motif stabilized by m 6A and Mg 2. Nat Commun 2018; 9:2761. [PMID: 30018356 PMCID: PMC6050335 DOI: 10.1038/s41467-018-05243-z] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 05/02/2018] [Indexed: 02/03/2023] Open
Abstract
N6-Methyladenosine (m6A) is an abundant post-transcriptional RNA modification that influences multiple aspects of gene expression. In addition to recruiting proteins, m6A can modulate RNA function by destabilizing base pairing. Here, we show that when neighbored by a 5' bulge, m6A stabilizes m6A-U base pairs, and global RNA structure by ~1 kcal mol-1. The bulge most likely provides the flexibility needed to allow optimal stacking between the methyl group and 3' neighbor through a conformation that is stabilized by Mg2+. A bias toward this motif can help explain the global impact of methylation on RNA structure in transcriptome-wide studies. While m6A embedded in duplex RNA is poorly recognized by the YTH domain reader protein and m6A antibodies, both readily recognize m6A in this newly identified motif. The results uncover potentially abundant and functional m6A motifs that can modulate the epitranscriptomic structure landscape with important implications for the interpretation of transcriptome-wide data.
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Affiliation(s)
- Bei Liu
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Dawn K Merriman
- Department of Chemistry, Duke University, Durham, NC, 27710, USA
| | - Seung H Choi
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Maria A Schumacher
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Raphael Plangger
- Institute of Organic Chemistry and Center for Molecular Biosciences Innsbruck (CMBI), University of Innsbruck, 6020, Innsbruck, Austria
| | - Christoph Kreutz
- Institute of Organic Chemistry and Center for Molecular Biosciences Innsbruck (CMBI), University of Innsbruck, 6020, Innsbruck, Austria
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC, 27710, USA
- Department of Medicine, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Kate D Meyer
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Hashim M Al-Hashimi
- Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA.
- Department of Chemistry, Duke University, Durham, NC, 27710, USA.
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33
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Kennedy EM, Bogerd HP, Kornepati AVR, Kang D, Ghoshal D, Marshall JB, Poling BC, Tsai K, Gokhale NS, Horner SM, Cullen BR. Posttranscriptional m 6A Editing of HIV-1 mRNAs Enhances Viral Gene Expression. Cell Host Microbe 2017; 22:830. [PMID: 29241043 DOI: 10.1016/j.chom.2017.11.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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34
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Abstract
In a recent issue of Science, Akiyama et al. (2016) prove the existence of a pseudoknot that stabilizes a nuclease-resistant RNA structure in the 3' untranslated region of Zika virus. This reinforced structure blocks the 5'→3' exonuclease Xrn1 for the production of pathogenic subgenomic flaviviral RNAs.
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Affiliation(s)
- Nandan S Gokhale
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA; Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA.
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35
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Affiliation(s)
- Nandan S. Gokhale
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Stacy M. Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, United States of America
- Department of Medicine, Duke University Medical Center, Durham, North Carolina, United States of America
- * E-mail:
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36
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Abstract
The mitochondrial antiviral signaling (MAVS) protein is a central adaptor protein required for antiviral innate immune signaling. To facilitate its roles in innate immunity, MAVS localizes to multiple intracellular membranous compartments, including the mitochondria, the mitochondrial-associated ER membrane (MAM), and peroxisomes. Studies of MAVS function therefore often require an analysis of MAVS localization. To detect MAVS protein on intracellular membranes, biochemical fractionation to isolate MAMs, mitochondria, or peroxisomes can be used. Further, immunofluorescence with antibodies against specific membrane markers can be used to visualize MAVS distribution throughout the cell. Here, we describe the biochemical fractionation and immunofluorescence protocols used to detect MAVS subcellular localization.
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Affiliation(s)
- Christine Vazquez
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, 213 Research Dr., Box 3053, Durham, NC, 27710, USA
| | - Dia C Beachboard
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, 213 Research Dr., Box 3053, Durham, NC, 27710, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, 213 Research Dr., Box 3053, Durham, NC, 27710, USA. .,Department of Medicine, Duke University Medical Center, 213 Research Dr., Box 3053, Durham, NC, 27710, USA.
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37
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Abstract
Cells are equipped with pattern recognition receptors to sense invading viruses. Nucleic acids of RNA viruses are sensed by RIG-I like receptors in the cytosol. Foreign DNA is sensed by cGAS and other DNA sensors in the cytosol. These pattern recognition receptors activate adaptor proteins to initiate antiviral innate immune responses.
The ability to recognize invading viral pathogens and to distinguish their components from those of the host cell is critical to initiate the innate immune response. The efficiency of this detection is an important factor in determining the susceptibility of the cell to viral infection. Innate sensing of viruses is, therefore, an indispensable step in the line of defense for cells and organisms. Recent discoveries have uncovered novel sensors of viral components and hallmarks of infection, as well as mechanisms by which cells discriminate between self and non-self. This review highlights the mechanisms used by cells to detect viral pathogens in the cytosol, and recent advances in the field of cytosolic sensing of viruses.
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Affiliation(s)
- Michael J McFadden
- Department of Molecular Genetics & Microbiology, Duke University Medical Center Durham, NC 27710, USA
| | - Nandan S Gokhale
- Department of Molecular Genetics & Microbiology, Duke University Medical Center Durham, NC 27710, USA
| | - Stacy M Horner
- Department of Molecular Genetics & Microbiology, Duke University Medical Center Durham, NC 27710, USA; Department of Medicine, Duke University Medical Center Durham, NC 27710, USA.
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38
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Jarret A, McFarland AP, Horner SM, Kell A, Schwerk J, Hong M, Badil S, Joslyn RC, Baker DP, Carrington M, Hagedorn CH, Gale M, Savan R. Hepatitis-C-virus-induced microRNAs dampen interferon-mediated antiviral signaling. Nat Med 2016; 22:1475-1481. [PMID: 27841874 PMCID: PMC5551900 DOI: 10.1038/nm.4211] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 09/15/2016] [Indexed: 12/12/2022]
Abstract
Hepatitis C virus (HCV) infects 200 million people globally, and 60-80% of cases persist as a chronic infection that will progress to cirrhosis and liver cancer in 2-10% of patients. We recently demonstrated that HCV induces aberrant expression of two host microRNAs (miRNAs), miR-208b and miR-499a-5p, encoded by myosin genes in infected hepatocytes. These miRNAs, along with AU-rich-element-mediated decay, suppress IFNL2 and IFNL3, members of the type III interferon (IFN) gene family, to support viral persistence. In this study, we show that miR-208b and miR-499a-5p also dampen type I IFN signaling in HCV-infected hepatocytes by directly down-regulating expression of the type I IFN receptor chain, IFNAR1. Inhibition of these miRNAs by using miRNA inhibitors during HCV infection increased expression of IFNAR1. Additionally, inhibition rescued the antiviral response to exogenous type I IFN, as measured by a marked increase in IFN-stimulated genes and a decrease in HCV load. Treatment of HCV-infected hepatocytes with type I IFN increased expression of myosins over HCV infection alone. Since these miRNAs can suppress type III IFN family members, these data collectively define a novel cross-regulation between type I and III IFNs during HCV infection.
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Affiliation(s)
- Abigail Jarret
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Adelle P McFarland
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Stacy M Horner
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Alison Kell
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Johannes Schwerk
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - MeeAe Hong
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Samantha Badil
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Rochelle C Joslyn
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | | | - Mary Carrington
- Cancer and Inflammation Program, Laboratory of Experimental Immunology, Leidos Biomedical Research-Frederick, Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA
- Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology and Harvard University, Boston, Massachusetts, USA
| | - Curt H Hagedorn
- Department of Medicine and Genetics Program, University of Arkansas for Medical Sciences, and The Central Arkansas Veterans Healthcare System, Little Rock, Arkansas, USA
| | - Michael Gale
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Ram Savan
- Department of Immunology, University of Washington, Seattle, Washington, USA
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39
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Abstract
Upon infection, both DNA and RNA viruses can be sensed by pattern recognition receptors (PRRs) in the cytoplasm or the nucleus to activate antiviral innate immunity. Sensing of viral products leads to the activation of a signaling cascade that ultimately results in transcriptional activation of type I and III interferons, as well as other antiviral genes that together mediate viral clearance and inhibit viral spread. Therefore, in order for viruses to replicate and spread efficiently, they must inhibit the host signaling pathways that induce the innate antiviral immune response. In this review, we will highlight recent advances in the understanding of the mechanisms by which viruses evade PRR detection, intermediate signaling molecule activation, transcription factor activation, and the actions of antiviral proteins.
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Affiliation(s)
- Dia C Beachboard
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Stacy M Horner
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710, USA; Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA.
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40
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Jarret AP, McFarland AP, Horner SM, Kell AM, Hong M, Badil S, Joslyn RC, Baker D, Carrington M, Hagedorn C, Gale MJ, Savan R. Hepatitis C virus hijacks host microRNAs to dampen antiviral interferon signaling. The Journal of Immunology 2016. [DOI: 10.4049/jimmunol.196.supp.63.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Hepatitis C virus (HCV) is a hepatotrophic ssRNA virus that infects over 160 million people worldwide and 60–80% of HCV cases will persist to a chronic infection, a serious risk factor for liver diseases. We recently discovered that HCV infection of hepatocytes induces expression of two microRNAs (miRNAs), miR-208b and miR-499a-5p. We found that these miRNA are capable of decreasing IFNL2 and IFNL3 expression to aid viral replication. Here we show that miR-208b and miR-499a-5p block type I IFN signaling in HCV-infected hepatocytes by directly targeting and down regulating the interferon (alpha, beta and omega) receptor 1 (IFNAR1) mRNA. Inhibition of these miRNAs during HCV infection of hepatoma cells rescued expression of IFNAR1 and improved the antiviral response to exogenous type I IFN. Interestingly, prolonged treatment of HCV-infected hepatocytes with type I IFNs led to a synergistic induction of miR-208b and miR-499a-5p, suggesting a critical role for type I IFN in the regulation of these miRNAs. As miR-208b and miR-499a-5p can target and suppress the IFNL3 risk allele, it is possible that increased miRNA expression following IFN treatment may partly explain why this genotype associates with poor response to IFN based therapies. Collectively these data define a new role for miR-208b and miR-499a-5p as HCV-induced suppressors of type I IFN signaling and add to our understanding of HCV immune evading strategies.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Mary Carrington
- 4Leidos Biomed. Res., Inc
- 5Ragon Inst. of MGH, MIT and Harvard
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41
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Kennedy EM, Bogerd HP, Kornepati AVR, Kang D, Ghoshal D, Marshall JB, Poling BC, Tsai K, Gokhale NS, Horner SM, Cullen BR. Posttranscriptional m(6)A Editing of HIV-1 mRNAs Enhances Viral Gene Expression. Cell Host Microbe 2016; 19:675-85. [PMID: 27117054 DOI: 10.1016/j.chom.2016.04.002] [Citation(s) in RCA: 241] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Revised: 03/18/2016] [Accepted: 04/01/2016] [Indexed: 12/22/2022]
Abstract
Covalent addition of a methyl group to adenosine N(6) (m(6)A) is an evolutionarily conserved and common RNA modification that is thought to modulate several aspects of RNA metabolism. While the presence of multiple m(6)A editing sites on diverse viral RNAs was reported starting almost 40 years ago, how m(6)A editing affects virus replication has remained unclear. Here, we used photo-crosslinking-assisted m(6)A sequencing techniques to precisely map several m(6)A editing sites on the HIV-1 genome and report that they cluster in the HIV-1 3' untranslated region (3' UTR). Viral 3' UTR m(6)A sites or analogous cellular m(6)A sites strongly enhanced mRNA expression in cis by recruiting the cellular YTHDF m(6)A "reader" proteins. Reducing YTHDF expression inhibited, while YTHDF overexpression enhanced, HIV-1 protein and RNA expression, and virus replication in CD4+ T cells. These data identify m(6)A editing and the resultant recruitment of YTHDF proteins as major positive regulators of HIV-1 mRNA expression.
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Affiliation(s)
- Edward M Kennedy
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Hal P Bogerd
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Anand V R Kornepati
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Dong Kang
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Delta Ghoshal
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Joy B Marshall
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Brigid C Poling
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Kevin Tsai
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Nandan S Gokhale
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA; Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA
| | - Bryan R Cullen
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA.
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42
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Affiliation(s)
- Stacy M. Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, United States of America
- Department of Medicine, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Susanna Naggie
- Department of Medicine, Duke University Medical Center, Durham, North Carolina, United States of America
- Duke Clinical Research Institute, Durham, North Carolina, United States of America
- * E-mail:
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43
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Abstract
Experimental studies on the interactions of the positive strand RNA virus hepatitis C virus (HCV) with the host have contributed to several discoveries in the field of antiviral innate immunity. These include revealing the antiviral sensing pathways that lead to the induction of type I interferon (IFN) during HCV infection and also the importance of type III IFNs in the antiviral immune response to HCV. These studies on HCV/host interactions have contributed to our overall understanding of viral sensing and viral evasion of the antiviral intracellular innate immune response. In this review, I will highlight how these studies of HCV/host interactions have led to new insights into antiviral innate immunity. Overall, I hope to emphasize that studying antiviral immunity in the context of virus infection is necessary to fully understand antiviral immunity and how it controls the outcome of viral infection.
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Affiliation(s)
- Stacy M Horner
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710, United States; Department of Medicine, Duke University Medical Center, Durham, NC 27710, United States.
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44
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Horner SM, Wilkins C, Badil S, Iskarpatyoti J, Gale M. Proteomic analysis of mitochondrial-associated ER membranes (MAM) during RNA virus infection reveals dynamic changes in protein and organelle trafficking. PLoS One 2015; 10:e0117963. [PMID: 25734423 PMCID: PMC4348417 DOI: 10.1371/journal.pone.0117963] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Accepted: 01/06/2015] [Indexed: 02/07/2023] Open
Abstract
RIG-I pathway signaling of innate immunity against RNA virus infection is organized between the ER and mitochondria on a subdomain of the ER called the mitochondrial-associated ER membrane (MAM). The RIG-I adaptor protein MAVS transmits downstream signaling of antiviral immunity, with signaling complexes assembling on the MAM in association with mitochondria and peroxisomes. To identify components that regulate MAVS signalosome assembly on the MAM, we characterized the proteome of MAM, ER, and cytosol from cells infected with either chronic (hepatitis C) or acute (Sendai) RNA virus infections, as well as mock-infected cells. Comparative analysis of protein trafficking dynamics during both chronic and acute viral infection reveals differential protein profiles in the MAM during RIG-I pathway activation. We identified proteins and biochemical pathways recruited into and out of the MAM in both chronic and acute RNA viral infections, representing proteins that drive immunity and/or regulate viral replication. In addition, by using this comparative proteomics approach, we identified 3 new MAVS-interacting proteins, RAB1B, VTN, and LONP1, and defined LONP1 as a positive regulator of the RIG-I pathway. Our proteomic analysis also reveals a dynamic cross-talk between subcellular compartments during both acute and chronic RNA virus infection, and demonstrates the importance of the MAM as a central platform that coordinates innate immune signaling to initiate immunity against RNA virus infection.
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Affiliation(s)
- Stacy M. Horner
- Department of Immunology, University of Washington, Seattle, Washington, United States of America
- Department of Medicine, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Courtney Wilkins
- Department of Immunology, University of Washington, Seattle, Washington, United States of America
| | - Samantha Badil
- Department of Immunology, University of Washington, Seattle, Washington, United States of America
| | - Jason Iskarpatyoti
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Michael Gale
- Department of Immunology, University of Washington, Seattle, Washington, United States of America
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Abstract
Hepatitis C virus (HCV) causes chronic liver disease and poses a major clinical and economic burden worldwide. HCV is an RNA virus that is sensed as non-self in the infected liver by host pattern recognition receptors, triggering downstream signaling to interferons (IFNs). The type III IFNs play an important role in immunity to HCV, and human genetic variation in their gene loci is associated with differential HCV infection outcomes. HCV evades host antiviral innate immune responses to mediate a persistent infection in the liver. This review focuses on anti-HCV innate immune sensing, innate signaling and effectors, and the processes and proteins used by HCV to evade and regulate host innate immunity.
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Affiliation(s)
- Nandan S Gokhale
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710
| | - Christine Vazquez
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710
| | - Stacy M Horner
- Department of Molecular Genetics & Microbiology, Duke University Medical Center, Durham, NC 27710 ; Department of Medicine, Duke University Medical Center, Durham, NC 27710
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Horner SM. Defining the spatial relationship between hepatitis C virus infection and interferon-stimulated gene induction in the human liver. Hepatology 2014; 59:2065-7. [PMID: 24375835 DOI: 10.1002/hep.26960] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Revised: 11/27/2013] [Accepted: 11/27/2013] [Indexed: 12/07/2022]
Affiliation(s)
- Stacy M Horner
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC; Department of Medicine, Duke University Medical Center, Durham, NC
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McFarland AP, Horner SM, Jarret A, Joslyn RC, Bindewald E, Shapiro BA, Delker DA, Hagedorn CH, Carrington M, Gale M, Savan R. The favorable IFNL3 genotype escapes mRNA decay mediated by AU-rich elements and hepatitis C virus-induced microRNAs. Nat Immunol 2014; 15:72-9. [PMID: 24241692 PMCID: PMC4183367 DOI: 10.1038/ni.2758] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 09/24/2013] [Indexed: 12/12/2022]
Abstract
IFNL3, which encodes interferon-λ3 (IFN-λ3), has received considerable attention in the hepatitis C virus (HCV) field, as many independent genome-wide association studies have identified a strong association between polymorphisms near IFNL3 and clearance of HCV. However, the mechanism underlying this association has remained elusive. In this study, we report the identification of a functional polymorphism (rs4803217) in the 3' untranslated region (UTR) of IFNL3 mRNA that dictated transcript stability. We found that this polymorphism influenced AU-rich element (ARE)-mediated decay (AMD) of IFNL3 mRNA, as well as the binding of HCV-induced microRNAs during infection. Together these pathways mediated robust repression of the unfavorable IFNL3 polymorphism. Our data reveal a previously unknown mechanism by which HCV attenuates the antiviral response and indicate new potential therapeutic targets for HCV treatment.
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Affiliation(s)
- Adelle P McFarland
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Stacy M Horner
- 1] Department of Immunology, University of Washington, Seattle, Washington, USA. [2]
| | - Abigail Jarret
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Rochelle C Joslyn
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Eckart Bindewald
- Basic Science Program, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA
| | - Bruce A Shapiro
- Center for Cancer Research Nanobiology Program, National Cancer Institute, Frederick, Maryland, USA
| | - Don A Delker
- Divison of Gastroenterology, Hepatology and Nutrition, School of Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Curt H Hagedorn
- 1] Divison of Gastroenterology, Hepatology and Nutrition, School of Medicine, University of Utah, Salt Lake City, Utah, USA. [2]
| | - Mary Carrington
- 1] Cancer and Inflammation Program, Laboratory of Experimental Immunology, Science Applications International Corporation-Frederick, Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA. [2] Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology and Harvard University, Boston, Massachusetts, USA
| | - Michael Gale
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Ram Savan
- Department of Immunology, University of Washington, Seattle, Washington, USA
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48
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Abstract
Hepatitis C virus (HCV) is a global public health problem involving chronic infection of the liver, which can cause liver disease and is linked with liver cancer. Viral innate immune evasion strategies and human genetic determinants underlie the transition of acute HCV infection to viral persistence and the support of chronic infection. Host genetic factors, such as sequence polymorphisms in IFNL3, a gene in the host interferon system, can influence both the outcome of the infection and the response to antiviral therapy. Recent insights into how HCV regulates innate immune signaling within the liver reveal a complex interaction of patient genetic background with viral and host factors of innate immune triggering and control that imparts the outcome of HCV infection and immunity.
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Affiliation(s)
- Stacy M Horner
- Department of Immunology, University of Washington, Seattle, Washington, USA
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49
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Liu HM, Loo YM, Horner SM, Zornetzer GA, Katze MG, Gale M. The mitochondrial targeting chaperone 14-3-3ε regulates a RIG-I translocon that mediates membrane association and innate antiviral immunity. Cell Host Microbe 2012; 11:528-37. [PMID: 22607805 PMCID: PMC3358705 DOI: 10.1016/j.chom.2012.04.006] [Citation(s) in RCA: 158] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2011] [Revised: 02/29/2012] [Accepted: 04/04/2012] [Indexed: 02/07/2023]
Abstract
RIG-I is a cytosolic pathogen recognition receptor that initiates immune responses against RNA viruses. Upon viral RNA recognition, antiviral signaling requires RIG-I redistribution from the cytosol to membranes where it binds the adaptor protein, MAVS. Here we identify the mitochondrial targeting chaperone protein, 14-3-3ε, as a RIG-I-binding partner and essential component of a translocation complex or "translocon" containing RIG-I, 14-3-3ε, and the TRIM25 ubiquitin ligase. The RIG-I translocon directs RIG-I redistribution from the cytosol to membranes where it mediates MAVS-dependent innate immune signaling during acute RNA virus infection. 14-3-3ε is essential for the stable interaction of RIG-I with TRIM25, which facilitates RIG-I ubiquitination and initiation of innate immunity against hepatitis C virus and other pathogenic RNA viruses. Our results define 14-3-3ε as a key component of a RIG-I translocon required for innate antiviral immunity.
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Affiliation(s)
- Helene Minyi Liu
- Department of Immunology, University of Washington School of Medicine, 1959 NE Pacific St, Seattle, WA 98195-7950, USA
| | - Yueh-Ming Loo
- Department of Immunology, University of Washington School of Medicine, 1959 NE Pacific St, Seattle, WA 98195-7950, USA
| | - Stacy M. Horner
- Department of Immunology, University of Washington School of Medicine, 1959 NE Pacific St, Seattle, WA 98195-7950, USA
| | | | - Michael G. Katze
- Department of Microbiology, University of Washington School of Medicine, 1959 NE Pacific St, Seattle, WA 98195-7950, USA
- Washington Regional Primate Research Center, University of Washington School of Medicine, 1959 NE Pacific St, Seattle, WA 98195-7950, USA
| | - Michael Gale
- Department of Immunology, University of Washington School of Medicine, 1959 NE Pacific St, Seattle, WA 98195-7950, USA
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50
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Abstract
Escape from antagonism by hepatitis C and related viruses has repeatedly evolved in antiviral factor MAVS via convergent evolution, revealing an ancient history of previous viral encounters in primates. The ability to mount an interferon response on sensing viral infection is a critical component of mammalian innate immunity. Several viruses directly antagonize viral sensing pathways to block activation of the host immune response. Here, we show that recurrent viral antagonism has shaped the evolution of the host protein MAVS—a crucial component of the viral-sensing pathway in primates. From sequencing and phylogenetic analyses of MAVS from 21 simian primates, we found that MAVS has evolved under strong positive selection. We focused on how this positive selection has shaped MAVS' susceptibility to Hepatitis C virus (HCV). We functionally tested MAVS proteins from diverse primate species for their ability to resist antagonism by HCV, which uses its protease NS3/4A to cleave human MAVS. We found that MAVS from multiple primates are resistant to inhibition by the HCV protease. This resistance maps to single changes within the protease cleavage site in MAVS, which protect MAVS from getting cleaved by the HCV protease. Remarkably, most of these changes have been independently acquired at a single residue 506 that evolved under positive selection. We show that “escape” mutations lower affinity of the NS3 protease for MAVS and allow it to better restrict HCV replication. We further show that NS3 proteases from all other primate hepaciviruses, including the highly divergent GBV-A and GBV-C viruses, are functionally similar to HCV. We conclude that convergent evolution at residue 506 in multiple primates has resulted in escape from antagonism by hepaciviruses. Our study provides a model whereby insights into the ancient history of viral infections in primates can be gained using extant host and virus genes. Our analyses also provide a means by which primates might clear infections by extant hepaciviruses like HCV. Hepatitis C virus (HCV) causes chronic liver disease and is estimated to infect 170 million people worldwide. HCV is able to establish a persistent infection in part by inhibiting the innate immune response. It does so by using its protease, NS3, to cleave the host's antiviral factor MAVS, which normally activates the interferon response. Using an assay that measures MAVS activity, we found that multiple primate species contain a version of MAVS that is resistant to HCV antagonism. Surprisingly, most of these primates have independently converged on changes in the same amino acid residue of MAVS to escape cleavage by the HCV protease. We found that the HCV protease has lower binding affinity for these resistant MAVS variants, which consequently are more effective at restricting HCV infection. Using a combination of phylogenetic and functional analyses of proteases from other HCV-related viruses, we infer that ancestral primates were likely exposed to and adapted to HCV-like viruses. One consequence of this adaptation is that changes that have given rise to extant MAVS variants may now provide protection from modern-day viruses.
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Affiliation(s)
- Maulik R. Patel
- Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Yueh-Ming Loo
- Department of Immunology, University of Washington School of Medicine, Seattle, Washington, United States of America
| | - Stacy M. Horner
- Department of Immunology, University of Washington School of Medicine, Seattle, Washington, United States of America
| | - Michael Gale
- Department of Immunology, University of Washington School of Medicine, Seattle, Washington, United States of America
| | - Harmit S. Malik
- Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Howard Hughes Medical Institute, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- * E-mail:
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