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Circovirus Rep evades immune restriction by disrupting cGAS oligomerization and phase separation

by Yuan, Ye , Yin, Hongyan , Chai, Lvye , Ya, Yan , Qu, Weiyu , Zhao, Zhenchao , Wang, Haiwei , Li, Xin , Li, Minjie

in Analysis / Animals / Binding / Biology and life sciences / Circoviridae Infections - immunology / Circoviridae Infections - virology / Circovirus - immunology / Composition / Deoxyribonucleic acid / Disease susceptibility / Disruption / DNA / Dosage and administration / Drug therapy / Herpes viruses / Humans / Immune Evasion - immunology / Immune response / Immunosuppression / Infections / Interferon / Interferon Type I - immunology / Kinases / Mitochondrial DNA / Nucleotidyltransferases - immunology / Nucleotidyltransferases - metabolism / Oligomerization / Oligomers / Patient outcomes / Phase Separation / Proteins / Research and Analysis Methods / Risk factors / Signal transduction / Swine / Viral Proteins - genetics / Viral Proteins - immunology / Viral Proteins - metabolism / Virus diseases

2025

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Circovirus Rep evades immune restriction by disrupting cGAS oligomerization and phase separation

by Yuan, Ye , Yin, Hongyan , Chai, Lvye , Ya, Yan , Qu, Weiyu , Zhao, Zhenchao , Wang, Haiwei , Li, Xin , Li, Minjie

2025

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Circovirus Rep evades immune restriction by disrupting cGAS oligomerization and phase separation

by Yuan, Ye , Yin, Hongyan , Chai, Lvye , Ya, Yan , Qu, Weiyu , Zhao, Zhenchao , Wang, Haiwei , Li, Xin , Li, Minjie

2025

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Journal Article

Circovirus Rep evades immune restriction by disrupting cGAS oligomerization and phase separation

Yuan, Ye,

Yin, Hongyan,

Chai, Lvye,

Ya, Yan,

Qu, Weiyu,

Zhao, Zhenchao,

Wang, Haiwei,

Li, Xin,

Li, Minjie

2025

Overview

Cyclic GMP-AMP synthase (cGAS) is a key sensor of double-stranded DNA (dsDNA), initiating oligomerization and phase separation to drive immune responses against pathogens and endogenous damage. Porcine circovirus (PCV) induces immunosuppression, heightening susceptibility to secondary infections, but the underlying mechanisms remain unclear. Here, we report PCV type 2d (PCV2d) infection fails to induce type I interferons (IFN-I) and significantly suppresses IFN-I production upon poly (dA:dT) stimulation in a dose-dependent manner. Mechanistically, the replication-related protein (Rep) proteins of PCV2, PCV3 and PCV4 inhibit cGAS-mediated IFN-I induction by competitively binding dsDNA, thereby disrupting cGAS oligomerization and phase separation. Interestingly, Rep also suppresses mitochondria DNA-induced cGAS activation. We further identify Rep residues Q12 and R199-W202 as key regions facilitating dsDNA binding. Our findings reveal a previously unrecognized mechanism by which circovirus Rep antagonizes cGAS activation, providing new insights into PCV-induced immunosuppression.

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Publisher

Public Library of Science,Public Library of Science (PLoS)

Subject

Analysis

/ Animals

/ Binding

/ Biology and life sciences

/ Circoviridae Infections - immunology

/ Circoviridae Infections - virology

/ Circovirus - immunology