Fated for decay: RNA elements targeted by viral endonucleases

Area of Science:

• Molecular Biology
• Virology
• Gene Expression Regulation

Background:

• Messenger RNA (mRNA) regulation is intricately linked to global gene expression through RNA elements coordinating RNA-protein and RNA-RNA interactions.
• Viruses employ strategies to manipulate these RNA features, leading to host shutoff and global suppression of host gene expression.
• Viral endoribonucleases are key effectors in orchestrating this host cell takeover.

Purpose of the Study:

• To explore the RNA structures and sequence features targeted by viral endonucleases.
• To understand how these features render mRNA susceptible or resistant to viral endonuclease cleavage.
• To elucidate viral strategies for controlling host gene expression and host shutoff.

Main Methods:

• Review and analysis of existing literature on viral endoribonucleases and their mRNA targets.
• Examination of large-scale screens estimating the impact of viral nucleases on the host transcriptome.
• Comparative analysis of distinct mRNA elements targeted by different viral endonucleases.

Main Results:

• Viral endoribonucleases decimate a significant portion (estimated >70%) of the host transcriptome.
• Each viral endonuclease has evolved to target specific mRNA structural or sequence features.
• These viral strategies highlight conserved mechanisms for controlling host gene expression.

Conclusions:

• Understanding the targeting and escape mechanisms of viral endonucleases provides deep insights into cellular RNA regulation.
• The interplay between viral nucleases and mRNA features underscores the critical relationship between RNA fate and cell fate.
• Further research into these mechanisms can reveal novel aspects of RNA biology and host-pathogen interactions.