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alphavirus

  • Plasmacytoid Dendritic Cells Mediate Control of Ross River Virus Infection via a Type I Interferon-Dependent, MAVS-Independent Mechanism
    Pathogenesis and Immunity
    Plasmacytoid Dendritic Cells Mediate Control of Ross River Virus Infection via a Type I Interferon-Dependent, MAVS-Independent Mechanism

    Arthritogenic alphaviruses, including Ross River virus (RRV), are human pathogens that cause debilitating acute and chronic musculoskeletal disease and are a significant public health burden. Using an attenuated RRV with enhanced susceptibility to host innate immune responses has revealed key cellular and molecular mechanisms that can mediate control of attenuated RRV infection and that are evaded by more virulent RRV strains.

    ...
    Kelsey C. Haist, Kathryn S. Carpentier, Bennett J. Davenport, Thomas E. Morrison
  • Interdomain Flexibility of Chikungunya Virus nsP2 Helicase-Protease Differentially Influences Viral RNA Replication and Infectivity
    Genome Replication and Regulation of Viral Gene Expression
    Interdomain Flexibility of Chikungunya Virus nsP2 Helicase-Protease Differentially Influences Viral RNA Replication and Infectivity

    CHIKV nsP2 plays multiple roles in viral RNA replication and virus-host interactions. The helicase and protease regions of nsP2 are connected through a short linker.

    Yee-Song Law, Sainan Wang, Yaw Bia Tan, Orion Shih, Age Utt, Wei Yang Goh, Bing-Jun Lian, Ming Wei Chen, U-Ser Jeng, Andres Merits, Dahai Luo
  • Chikungunya Virus Replication Rate Determines the Capacity of Crossing Tissue Barriers in Mosquitoes
    Virus-Cell Interactions | Spotlight
    Chikungunya Virus Replication Rate Determines the Capacity of Crossing Tissue Barriers in Mosquitoes

    It is well established that selective pressures in mosquito vectors impose population bottlenecks for arboviruses. Here, we used a CHIKV Caribbean lineage mutant carrying a deletion in the 3′ UTR to study host-virus interactions in vivo in the epidemic mosquito vector Aedes aegypti. We found that the mutant virus had a delayed replication rate in mosquitoes,...

    Fernando Merwaiss, Claudia V. Filomatori, Yasutsugu Susuki, Eugenia S. Bardossy, Diego E. Alvarez, María-Carla Saleh
  • Open Access
    Chikungunya Virus Strains from Each Genetic Clade Bind Sulfated Glycosaminoglycans as Attachment Factors
    Virus-Cell Interactions | Spotlight
    Chikungunya Virus Strains from Each Genetic Clade Bind Sulfated Glycosaminoglycans as Attachment Factors

    Alphavirus infections are a global health threat, contributing to outbreaks of disease in many parts of the world. Recent epidemics caused by CHIKV, an arthritogenic alphavirus, resulted in more than 8.5 million cases as the virus has spread into new geographic regions, including the Western Hemisphere. CHIKV causes disease in the majority of people infected, leading to severe and debilitating arthritis. Despite the severity of CHIKV...

    Nicole McAllister, Yan Liu, Lisete M. Silva, Anthony J. Lentscher, Wengang Chai, Nian Wu, Kira A. Griswold, Krishnan Raghunathan, Lo Vang, Jeff Alexander, Kelly L. Warfield, Michael S. Diamond, Ten Feizi, Laurie A. Silva, Terence S. Dermody
  • Open Access
    Emergence and Magnitude of ML336 Resistance in Venezuelan Equine Encephalitis Virus Depend on the Microenvironment
    Genetic Diversity and Evolution | Spotlight
    Emergence and Magnitude of ML336 Resistance in Venezuelan Equine Encephalitis Virus Depend on the Microenvironment

    RNA viruses, including Venezuelan equine encephalitis virus (VEEV), have high mutation rates that allow for rapid adaptation to selective pressures in their environment. Antiviral compounds exert one such pressure on virus populations during infections. Next-generation sequencing allows for examination of viruses at the population level, which enables tracking of low levels of single-nucleotide polymorphisms in the population over time...

    Jasper Lee, Jyothi Parvathareddy, Dong Yang, Shruti Bansal, Kathryn O’Connell, Jennifer E. Golden, Colleen B. Jonsson
  • Hypervariable Domain of nsP3 of Eastern Equine Encephalitis Virus Is a Critical Determinant of Viral Virulence
    Pathogenesis and Immunity
    Hypervariable Domain of nsP3 of Eastern Equine Encephalitis Virus Is a Critical Determinant of Viral Virulence

    Hypervariable domains (HVDs) of alphavirus nsP3 proteins recruit host proteins into viral replication complexes. The sets of HVD-binding host factors are specific for each alphavirus, and we have previously identified those specific for EEEV. The results of this study demonstrate that the deletions of the binding sites of the G3BP and FXR protein families in the nsP3 HVD of EEEV make the virus avirulent for mice. Mutations in the...

    Chetan D. Meshram, Nikita Shiliaev, Elena I. Frolova, Ilya Frolov
  • Palmitoylated Cysteines in Chikungunya Virus nsP1 Are Critical for Targeting to Cholesterol-Rich Plasma Membrane Microdomains with Functional Consequences for Viral Genome Replication
    Virus-Cell Interactions
    Palmitoylated Cysteines in Chikungunya Virus nsP1 Are Critical for Targeting to Cholesterol-Rich Plasma Membrane Microdomains with Functional Consequences for Viral Genome Replication

    Functional alphavirus replication complexes are anchored to the host cell membranes through the interaction of nsP1 with the lipid bilayers. In this work, we investigate the importance of cholesterol for such an association. We show that nsP1 has affinity for cholesterol-rich membrane microdomains formed at the plasma membrane and identify conserved palmitoylated cysteine(s) in nsP1 as the key determinant for cholesterol affinity. We...

    William Bakhache, Aymeric Neyret, Eric Bernard, Andres Merits, Laurence Briant
  • High-Throughput Fluorescence-Based Screen Identifies the Neuronal MicroRNA miR-124 as a Positive Regulator of Alphavirus Infection
    Virus-Cell Interactions
    High-Throughput Fluorescence-Based Screen Identifies the Neuronal MicroRNA miR-124 as a Positive Regulator of Alphavirus Infection

    Arthropod-borne (arbo) viruses are part of a class of pathogens that are transmitted to their final hosts by insects. Because of climate change, the habitat of some of these insects, such as mosquitoes, is shifting, thereby facilitating the emergence of viral epidemics. Among the pathologies associated with arbovirus infection, neurological diseases such as meningitis and encephalitis represent a significant health burden. Using a...

    Paula López, Erika Girardi, Bryan C. Mounce, Amélie Weiss, Béatrice Chane-Woon-Ming, Mélanie Messmer, Pasi Kaukinen, Arnaud Kopp, Diane Bortolamiol-Becet, Ali Fendri, Marco Vignuzzi, Laurent Brino, Sébastien Pfeffer
  • Chikungunya Virus Evades Antiviral CD8<sup>+</sup> T Cell Responses To Establish Persistent Infection in Joint-Associated Tissues
    Pathogenesis and Immunity
    Chikungunya Virus Evades Antiviral CD8+ T Cell Responses To Establish Persistent Infection in Joint-Associated Tissues

    CHIKV is a reemerging mosquito-transmitted virus that in the last decade has spread into Europe, Asia, the Pacific Region, and the Americas. Joint pain, swelling, and stiffness can endure for months to years after CHIKV infection, and epidemics have a severe economic impact. Elucidating the mechanisms by which CHIKV subverts antiviral immunity to establish and maintain a persistent infection may lead to the development of new...

    Bennett J. Davenport, Christopher Bullock, Mary K. McCarthy, David W. Hawman, Kenneth M. Murphy, Ross M. Kedl, Michael S. Diamond, Thomas E. Morrison
  • Identification of Natural Molecular Determinants of Ross River Virus Type I Interferon Modulation
    Pathogenesis and Immunity
    Identification of Natural Molecular Determinants of Ross River Virus Type I Interferon Modulation

    By identifying natural Ross River virus (RRV) amino acid determinants for type I interferon (IFN) modulation, this study gives further insight into the mechanism of type I IFN modulation by alphaviruses. Here, the crucial role of type I IFN in the early stages of RRV disease pathogenesis is further demonstrated. This study also provides a comparison of the roles of different parts of the RRV nonstructural region in type I IFN modulation...

    Xiang Liu, Margit Mutso, Liubov Cherkashchenko, Eva Zusinaite, Lara J. Herrero, Stephen L. Doggett, John Haniotis, Andres Merits, Belinda L. Herring, Adam Taylor, Suresh Mahalingam

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