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Published on: March 13, 2018
The Tetraspanin CD81 Is a Host Factor for Chikungunya Virus Replication
Lisa Lasswitz1,2, Francisco J Zapatero-Belinchón1,2,3,4, Rebecca Moeller1,2
1Institute for Experimental Virology, TWINCORE, Centre for Experimental and Clinical Infection Research, a joint venture between the Medical School Hannover and the Helmholtz Centre for Infection Research, Hanover, Germany.
The study identifies CD81 as a crucial host factor for chikungunya virus (CHIKV) and related alphaviruses. CD81 is essential for viral genome replication, not entry, and its cholesterol-binding ability is key to this function.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- Chikungunya virus (CHIKV) is a reemerging arthritogenic virus.
- CHIKV replicates in specialized plasma membrane compartments called spherules.
- Host factors are critical for viral replication and life cycle completion.
Purpose of the Study:
- To identify host factors essential for CHIKV replication.
- To elucidate the role of CD81 in the CHIKV life cycle.
- To understand the mechanism by which alphaviruses utilize host proteins for replication.
Main Methods:
- CRISPR-Cas9 mediated gene ablation of CD81 in human cells.
- Overexpression of CD81 in cells to assess infection enhancement.
- Analysis of CHIKV replication in CD81-deficient and wild-type cells.
- Comparative analysis of CD81 dependence across different alphaviruses and other RNA viruses.
- Investigation of the role of cholesterol binding in CD81 function.
Main Results:
- CD81 is a host factor required for CHIKV replication, not entry.
- Ablation of CD81 significantly reduces CHIKV permissiveness, while overexpression enhances it.
- CD81 is crucial for viral genome replication, particularly in target cells like fibroblasts, muscle, and liver cells.
- Other alphaviruses (RRV, SFV, SINV, VEEV) also depend on CD81, unlike other RNA viruses (e.g., coronaviruses).
- CD81's cholesterol-binding ability is essential for its role in promoting alphavirus replication.
Conclusions:
- CD81 is a critical host factor for chikungunya virus and related alphaviruses.
- Alphaviruses hijack CD81, leveraging its cholesterol-binding capacity to facilitate viral genome replication.
- This discovery provides novel insights into alphavirus replication strategies and host-pathogen interactions.
