bioRxivJClub
Identification of cis-Acting Elements that Regulate Influenza A Virus Segment 7 Differential mRNA Splicing
bioRxiv · · Preprint · Open access
Zhou, Pinto + 4 more
Abstract ↗AI summary
The abstract is read at the publisher; the summary is JClub's.
Conserved cis-acting splicing elements in Influenza A virus segment 7 tune the M1:M2 mRNA balance, with upstream polypyrimidine tracts acting positively at the 5' end and negatively at the 3' end.
- Why it matters: Segment 7 produces two essential proteins from different splicing outcomes, yet the intrinsic sequence rules that set their balance are not fully defined.
- What they did: The study systematically tested conserved cis-acting splicing elements using mutagenesis across splice acceptor, upstream polypyrimidine tracts, the mRNA2 branch point candidate A713, and the splice donor sequence, then assessed effects on splicing and M1:M2 balance.
- The result: Mutations that significantly perturbed M1:M2 balance produced viable viruses, while the splice donor sequence was largely intolerant of mutation, implying evolutionary flexibility mainly through polypyrimidine tract and branch point signals.
The findingWhy it mattersWhat they didThe result
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