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Updated: Apr 13, 2026
08:32
Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
Published on: March 2, 2014
10.4K
MITD1 is a brain-specific interferon-inducible factor that inhibits flavivirus replication
Jim Zoladek1, Marion Cannac1,2, Maël Seite1
1Viral Trafficking, Restriction and Innate Signaling, CNRS UMR 9004, Institut de Recherche en Infectiologie de Montpellier, Université de Montpellier, Montpellier 34090, France.
Summary
MITD1, an interferon-stimulated gene, inhibits West Nile virus and Usutu virus replication by interfering with viral RNA replication. This finding reveals MITD1
Area of Science:
- Virology
- Immunology
- Cell Biology
Background:
- West Nile virus (WNV) and Usutu virus (USUV) are related neurotropic flaviviruses transmitted by mosquitoes.
- Human infections by WNV are common, while USUV infections are less frequent and severe.
Purpose of the Study:
- Identify human host factors influencing WNV and USUV pathogenicity.
- Investigate the antiviral role of interferon-stimulated genes (ISGs).
Main Methods:
- Arrayed expression screen of over 1,300 ISGs.
- Assessed antiviral activity against WNV, USUV, Zika, and dengue viruses.
- Investigated MITD1's mechanism of action using ESCRT-III proteins.
- Analyzed MITD1 expression in human and mouse cells and tissues.
Main Results:
- Identified known antiviral ISGs (IFI6, SHFL, RTP4) and the novel antiviral gene MITD1.
- MITD1 inhibits replication of WNV, USUV, Zika, and dengue viruses.
- MITD1 disrupts viral RNA replication by sequestering ESCRT-III proteins.
- MITD1 is induced in the brain during USUV infection and in human microglia, mediating interferon-induced antiviral activity.
Conclusions:
- MITD1 is a novel antiviral factor against neurotropic flaviviruses.
- MITD1 plays a crucial role in cellular defense mechanisms against flavivirus infections, particularly in microglia.
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