The m⁶A reader YTHDC2 is essential for escape from KSHV SOX-induced RNA decay

Area of Science:

• Molecular Virology
• Epigenetics
• RNA Biology

Background:

• N6-methyladenosine (m⁶A) modifications regulate viral infections.
• Kaposi's sarcoma-associated herpesvirus (KSHV) manipulates host and viral transcripts during lytic infection.
• Viral endoribonuclease SOX degrades host and viral mRNAs.

Purpose of the Study:

• To investigate the role of m⁶A modifications in KSHV lytic infection.
• To determine how IL-6 mRNA evades SOX-mediated degradation.
• To elucidate the mechanism by which m⁶A confers SOX resistance to IL-6 mRNA.

Main Methods:

• Analysis of m⁶A deposition on viral and host transcripts during KSHV lytic infection.
• Investigating the interaction between m⁶A modification, SOX resistance element, and IL-6 mRNA.
• Assessing the recruitment of m⁶A reader YTHDC2 and its role in IL-6 transcript survival.

Main Results:

• m⁶A deposition is significantly altered during KSHV lytic infection, with a shift towards viral transcripts.
• Interleukin-6 (IL-6) mRNA is m⁶A modified within its SOX resistance element, conferring protection from SOX cleavage.
• The m⁶A modification recruits YTHDC2, which is essential for IL-6 transcript escape from viral degradation.

Conclusions:

• m⁶A modification is a critical mechanism for host cells to protect specific transcripts, like IL-6 mRNA, from viral manipulation during KSHV infection.
• The interplay between m⁶A, YTHDC2, and the SOX resistance element highlights a sophisticated host defense strategy against viral RNA degradation.
• Understanding these RNA-based regulatory mechanisms provides insights into viral pathogenesis and potential therapeutic targets.