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A series of cryo-EM structures of human IMPDH1 variants reveal polymorphic filaments. Blindness-associated mutations in IMPDH1 are characterized and half disrupt feedback inhibition. Together, these findings are a foundation for understanding IMPDH1 in retinal function and disease.
New data reveal a sequential mode of alternative polyadenylation. Distal polyA sites are processed first and the resultant transcripts are retained in the nuclear-chromatin matrix for subsequent cleavage and polyadenylation at proximal polyA sites.