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Trypanosoma brucei spp. cause African human and animal trypanosomiasis, a burden on health and economy in Africa. These hemoflagellates are distinguished by a kinetoplast nucleoid containing mitochondrial DNAs of two kinds: maxicircles encoding ribosomal RNAs (rRNAs) and proteins and minicircles bearing guide RNAs (gRNAs) for mRNA editing. All RNAs are produced by a phage-type RNA polymerase as 3′ extended precursors, which undergo exonucleolytic trimming. Most pre-mRNAs proceed through 3′ adenylation, uridine insertion/deletion editing, and 3′ A/U-tailing. The rRNAs and gRNAs are 3′ uridylated. Historically, RNA editing has attracted major research effort, and recently essential pre- and postediting processing events have been discovered. Here, we classify the key players that transform primary transcripts into mature molecules and regulate their function and turnover.
- RNA decay
- RNA editing
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