N6-Methyladenosine Positively Regulates Coxsackievirus B3 Replication

Area of Science:

• Virology
• Molecular Biology
• Epigenetics

Background:

• Coxsackievirus B3 (CVB3) is a major cause of viral myocarditis, but its replication mechanisms remain unclear.
• N6-methyladenosine (m⁶A) modification in viral genomes influences virus replication and pathogenesis.

Purpose of the Study:

• To investigate the role of m⁶A modification in CVB3 replication and pathogenesis.
• To explore the interaction between CVB3 and host m⁶A machinery.

Main Methods:

• Bioinformatic prediction (SRAMP) and indirect immunofluorescence assay (IFA) to identify m⁶A sites in CVB3.
• Treatment with m⁶A inhibitor (3-deazaadenosine) and manipulation of m⁶A-related proteins (METTL3, METTL14, FTO, ALKBH5, YTHDF proteins).
• Site-directed mutagenesis of m⁶A sites in the CVB3 genome.

Main Results:

• CVB3 genome contains predicted m⁶A sites, and CVB3 infection alters m⁶A protein expression and localization.
• m⁶A inhibition and mutation of m⁶A sites significantly reduced CVB3 replication.
• METTL3/14 positively regulate CVB3 replication, while FTO/ALKBH5 have inhibitory effects.
• Knockdown of YTHDF binding proteins markedly decreased CVB3 replication.

Conclusions:

• CVB3 exploits host m⁶A modification machinery to promote its replication.
• m⁶A modification is a critical factor in CVB3 pathogenesis.
• Targeting m⁶A pathways offers potential therapeutic strategies against CVB3 infection.