Alphaviruses are pathogens of humans and livestock with worldwide distribution. The classification of some species as select agents in conjunction with their impact on public health makes understanding their interaction with the host and development of interventions a high priority. Alphaviruses are obligatorily transmitted by a hematophagous arthropod vector in which a lifelong persistent infection is established. This pattern of infection implies an effective but incomplete immune response that preserves host fitness while allowing virus replication to continue thus facilitating virus transmission. A major impediment to understanding the critical virus-host interactions has been the inability to genetically manipulate the host organism. Drosophila melanogaster represents an excellent experimental system for elucidating the genetic, molecular, and biochemical mechanisms underlying numerous physiological and developmental processes. The proposed research aims to exploit the power of Drosophila genetics to define the recently characterized interactions between alphaviruses and two arthropod innate immune response pathways. A system for the analysis of alphavirus replication has been established in which an alphavirus replicon sequence encoding a reporter gene is expressed from the genome of Drosophila under the control of the GAL4-UAS misexpression system. The resulting replication of the viral RNA is observable through reporter gene activity. Mutational analyses of host pathways using this alphavirus replicon fly line have demonstrated an antiviral role for the Imd- and JAK-STAT pathways. This system has been further developed to produce infectious particles. Co-expression in Drosophila of the replicon and viral structural proteins leads to the production of replicon containing particles capable of a single round of infection. These basic tools will be used in combination with Drosophila genetics to (i) determine the viral components responsible for activation of Imd- and JAK-STAT pathways;(ii) identify host genes involved in virus-induced innate immune response;(iii) characterize host requirements for virus spread. The proposed research combines the power of Drosophila genetics with comparative genomics and molecular virology in order to advance our understanding of the interaction between alphaviruses and an arthropod host.

Public Health Relevance

Understanding virus-host interactions is essential to understanding the outcome of infection and determining means of interrupting transmission. The proposed research aims to examine the host response to alphaviruses using a model genetic system.

National Institute of Health (NIH)
National Institute of Allergy and Infectious Diseases (NIAID)
Research Project (R01)
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Vector Biology Study Section (VB)
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Repik, Patricia M
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Indiana University Bloomington
Schools of Arts and Sciences
United States
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Mackenzie-Liu, David; Sokoloski, Kevin J; Purdy, Sarah et al. (2018) Encapsidated Host Factors in Alphavirus Particles Influence Midgut Infection of Aedes aegypti. Viruses 10:
LaPointe, Autumn T; Gebhart, Natasha N; Meller, Megan E et al. (2018) The Identification and Characterization of Sindbis Virus RNA:Host Protein Interactions. J Virol :
Sokoloski, K J; Haist, K C; Morrison, T E et al. (2015) Noncapped Alphavirus Genomic RNAs and Their Role during Infection. J Virol 89:6080-92
Rupp, Jonathan C; Sokoloski, Kevin J; Gebhart, Natasha N et al. (2015) Alphavirus RNA synthesis and non-structural protein functions. J Gen Virol 96:2483-500
Sokoloski, Kevin J; Snyder, Anthony J; Liu, Natalia H et al. (2013) Encapsidation of host-derived factors correlates with enhanced infectivity of Sindbis virus. J Virol 87:12216-26
Kingsolver, Megan B; Huang, Zhijing; Hardy, Richard W (2013) Insect antiviral innate immunity: pathways, effectors, and connections. J Mol Biol 425:4921-36
Patel, Rohini K; Burnham, Andrew J; Gebhart, Natasha N et al. (2013) Role for subgenomic mRNA in host translation inhibition during Sindbis virus infection of mammalian cells. Virology 441:171-81
Huang, Zhijing; Kingsolver, Megan B; Avadhanula, Vasanthi et al. (2013) An antiviral role for antimicrobial peptides during the arthropod response to alphavirus replication. J Virol 87:4272-80
Ji, Chao; Arnold, Randy J; Sokoloski, Kevin J et al. (2013) Extending the coverage of spectral libraries: a neighbor-based approach to predicting intensities of peptide fragmentation spectra. Proteomics 13:756-65
Sokoloski, Kevin J; Hayes, Chelsea A; Dunn, Megan P et al. (2012) Sindbis virus infectivity improves during the course of infection in both mammalian and mosquito cells. Virus Res 167:26-33

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