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. 2000 Oct;6(10):1339–1346. doi: 10.1017/s135583820000087x

Evolution of four types of RNA editing in myxomycetes.

T L Horton 1, L F Landweber 1
PMCID: PMC1370006  PMID: 11073211

Abstract

The myxomycete Physarum polycephalum requires extensive RNA editing to create functional mitochondrial transcripts. The cytochrome c oxidase subunit 1 (col) transcript exhibits a combination of editing forms not found together in any other eukaryotic RNA: 66 insertions of ribonucleotides (59 Cs, a single U, and three mixed dinucleotides) as well as base conversion of four Cs to Us (Gott et al., J Biol Chem, 1993, 268:25483-25486). Through a phylogenetic survey of col DNA genes and RNA transcripts in representative myxomycetes, we have decoupled the four types of editing in this lineage. Some myxomycetes share insertional editing with P. polycephalum, yet lack C--> U conversion, consistent with previous reports of separation of insertional and base conversion editing in P. polycephalum extracts (Visomirski-Robic & Gott, RNA, 1995, 3:821-837). Most remarkably, we detect unique evolutionary histories of the three different types of insertional editing, though these have been indistinguishable in vitro. For example, Clastoderma debaryanum exhibits insertions of Us, but not Cs or dinucleotides.

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Selected References

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