The 3' ends of human pre-snRNAs are produced by RNA polymerase II CTD-dependent RNA processing.
Proper 3' end formation of the human pre-snRNAs synthesized by pol II requires the cis-acting 3' box, although the precise function of this element has proved difficult to determine. In vivo, 3' end formation is tightly linked to transcription. However, we have now been able to obtain transcription-independent 3' box-dependent processing in vitro. This finally demonstrates that the 3' end of pre-snRNAs is produced by RNA processing rather than by termination of transcription. The phosphorylat...Expand abstract
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