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Comparative in vivo Study of gp96 Adjuvanticity in the Frog Xenopus laevis
Published on: September 16, 2010
11.0K
Xenopus-FV3 host-pathogen interactions and immune evasion
Robert Jacques1, Eva-Stina Edholm1, Sanchez Jazz1
1Department of Microbiology and Immunology, University of Rochester Medical Center, Rochester, NY 14642, United States.
Virology
|June 20, 2017
Summary
This study reveals key ranavirus immune evasion genes (64R and 52L) that help the virus persist and spread by blocking interferon responses in frogs. Another gene (18K) regulates viral replication.
Area of Science:
- Virology
- Immunology
- Comparative Vertebrate Studies
Background:
- Ranaviruses are significant pathogens affecting ectothermic vertebrates.
- Understanding viral immune evasion mechanisms is crucial for controlling ranaviral diseases.
- The Xenopus laevis/ranavirus FV3 model provides insights into anti-ranavirus immunity.
Purpose of the Study:
- To investigate the roles of specific FV3 genes (64R, 52L, 18K) in viral replication, dissemination, and host immune interaction.
- To elucidate how these genes contribute to immune evasion in different developmental stages of Xenopus laevis.
- To understand the interplay between viral factors and host interferon responses.
Main Methods:
- Generation and analysis of FV3 knockout (KO) mutants lacking specific genes (Δ64R-FV3, Δ52L-FV3, FV3-Δ18K).
- Assessment of viral replication and dissemination in tadpole and adult Xenopus laevis.
- Evaluation of viral gene interactions with peritoneal macrophages.
- Quantification of viral genome copy numbers and host type I and III interferon gene expression.
Main Results:
- The 64R and 52L genes are critical for immune evasion, promoting viral persistence and dissemination by counteracting type III interferon in tadpoles and type I interferon in adult frogs.
- The 18K gene acts as a viral regulatory factor, leading to increased viral genome copy numbers and elevated interferon responses, but reduced infectious virus release.
- These viral genes differentially impact host immune responses depending on the host's developmental stage.
Conclusions:
- FV3 genes 64R and 52L are essential for evading host antiviral immunity, specifically interferon pathways, facilitating ranavirus spread in ectothermic vertebrates.
- The 18K gene plays a regulatory role in viral replication and host immune modulation, distinct from direct immune evasion.
- Findings contribute to a deeper understanding of ranavirus pathogenesis and host-virus interactions in amphibians.
