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The chemical reactions and pathways occurring in the nucleus and resulting in the breakdown of a messenger RNA (mRNA) molecule, initiated by the enzymatic addition of a sequence of adenylyl residues (polyadenylation) at the 3\' end the target mRNA. [GOC:dgf, GOC:krc, PMID:15145828, PMID:15828860, PMID:16431988, PMID:17643380, PMID:18000032, PMID:18644474]
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