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Steady-state circular RNAs (circRNAs) have been mapped to thousands of genomic loci in mammals. We studied circRNA processing using metabolic tagging of nascent RNAs with 4-thiouridine (4sU). Strikingly, the efficiency of circRNA processing from pre-mRNA is extremely low endogenously. Additional studies revealed that back-splicing outcomes correlate with fast RNA Polymerase II elongation rate and...
The casein kinase 1 (CK1) family participates in various cellular processes in eukaryotes, but CK1 function in higher plants remains largely unknown. Here, we characterize the function of Arabidopsis CK1 in the regulation of ethylene biosynthesis. Etiolated seedlings of a CK1.8-deficient mutant, ck1.8-1, showed characteristic ethylene-specific constitutive responses due to overaccumulation of ethylene...
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