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The role of m6A RNA methylation in a love-hate relationship between porcine rotavirus and host cells
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The role of m6A RNA methylation in a love-hate relationship between porcine rotavirus and host cells
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Journal Article
The role of m6A RNA methylation in a love-hate relationship between porcine rotavirus and host cells
2025
Overview
N6-methyladenosine (m
6
A), the most abundant mRNA modification, regulates various mRNA metabolism to affect numerous physiological processes, including immune response. Interestingly, many RNA viruses contain internal m
6
A modifications that contribute to viral replication and innate immune escape process, but its mechanisms remain unclear. Porcine rotavirus (PoRV) is a common cause of diarrhea and gastroenteritis in piglets. Here, we first revealed the m
6
A methylation profile on the PoRV genome. PoRV infection significantly reduced methyltransferase METTL3 expression and induced nuclear-cytoplasmic translocation of METTL3. The structural protein VP6 of PoRV can co-localize with METTL3 in the cytoplasm and bind to METTL3 protein, suggesting that PoRV hijacked the host METTL3 to achieve m
6
A methylation. On the contrary, knockdown of
Mettl3
or
Ythdf2
in IPEC cells inhibited the replication of PoRV. Mechanistically, silencing of
Mettl3
or
Ythdf2
enhanced the expression of IRF2 and IFI44L via an increase of mRNA stability of
Irf2
and
Ifi44l.
Furthermore, knockdown of
Irf2
and
Ifi44l
promoted viral replication in IPEC cells. In conclusion, PoRV took full advantage of METTL3 to promote replication, in turn, host reduced own m
6
A methylation to enhance IRF2 and IFI44L to restrain virus infection, suggesting a love-hate relationship between virus and host, and providing novel targets for developing antiviral drugs in the pig industry.
Graphical abstract
