RNA Other Processing Activities,Plastid RNA,RNA Maturation Pathways,Polycistronic Transcripts

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	RNA Other Processing Activities Although plastid RNAs are neither capped nor polyadenylated, RNA maturation pathways can be very complex. In addition to intron removal, primary transcripts are often cleaved to remove a portion of the untranslated RNA proximal to open reading frames.
The function of the 5' end RNA processing is not known but it may alter stability or transcript translatability. Polycistronic transcripts are also processed at internal sites. Here again the role RNA processing plays gene expression is unclear but one result is differential accumulation of RNA from some parts of long transcription units.