Functional RNA during Zika virus infection.

Area of Science:

• Virology
• Molecular Biology
• Genomics

Background:

• Zika virus (ZIKV) is a mosquito-borne flavivirus causing severe health issues like microcephaly.
• ZIKV replicates in both mosquitoes and primates, necessitating adaptations in its RNA genome.
• Viral RNA plays a crucial role in ZIKV infection, including evading host immune responses.

Purpose of the Study:

• To discuss the significance of ZIKV genomic RNA and functional RNAs in ZIKV infection.
• To assess the role of RNA modifications and host-viral interactions in ZIKV replication.
• To highlight the proviral functions of subgenomic flavivirus RNA (sfRNA) in antagonizing host defenses.

Main Methods:

• Review of existing literature on ZIKV RNA structure, modifications, and interactions.
• Analysis of ZIKV genomic RNA and functional RNAs, including sfRNA.
• Discussion of host factors influencing ZIKV RNA replication.

Main Results:

• ZIKV genomic RNA possesses nucleotide composition and modifications (e.g., methylation, G-quadruplexes) for replication in distinct hosts.
• Non-coding sfRNA is produced from the 3' UTR and antagonizes interferon and RNA interference pathways.
• Host factors interact with viral RNA to modulate replication efficiency.

Conclusions:

• ZIKV RNA and its functional RNAs are critical for productive infection and immune evasion.
• Understanding ZIKV RNA's role is essential for developing antiviral therapies and vaccines.
• sfRNA's antagonism of innate immunity is a key viral strategy for ZIKV propagation.