Molecular basis of polyadenylated RNA fate determination in the nucleus

Researchers identified the molecular mechanism that determines the fate of polyadenylated RNA in the nucleus on June 17, 2026. Biochemical, structural, and cell biological analyses published in Nature revealed that the protein UAP56, also known as DDX39B, works with a TREX-2-like module. This complex redirects non-functional polyadenylated RNAs away from export pathways and towards degradation. The study elucidates a critical step in cellular RNA quality control, ensuring that only functional RNAs are processed and exported from the nucleus. This discovery provides a deeper understanding of gene expression regulation and cellular homeostasis. The findings are significant for research into RNA processing disorders and the development of therapeutic strategies targeting aberrant RNA metabolism.