Abstract:
:RNA editing in plant organelles is mediated by site-specific, nuclear-encoded factors. Previous data suggested that the maintenance of these factors depends on the presence of their rapidly evolving cognate sites. The surprising ability of allotetraploid Nicotiana tabacum (tobacco) to edit a foreign site in the chloroplast ndhA messenger RNA was thought to be inherited from its diploid male ancestor, Nicotiana tomentosiformis. Here, we show that the same ndhA editing activity is also present in Nicotiana sylvestris, which is the female diploid progenitor of tobacco and which lacks the ndhA site. Hence, heterologous editing is not simply a result of tobacco's allopolyploid genome organization. Analyses of other editing sites after sexual or somatic transfer between land plants showed that heterologous editing occurs at a surprisingly high frequency. This suggests that the corresponding editing activities are conserved despite the absence of their target sites, potentially because they serve other functions in the plant cell.
journal_name
EMBO Repjournal_title
EMBO reportsauthors
Tillich M,Poltnigg P,Kushnir S,Schmitz-Linneweber Cdoi
10.1038/sj.embor.7400619keywords:
subject
Has Abstractpub_date
2006-03-01 00:00:00pages
308-13issue
3eissn
1469-221Xissn
1469-3178pii
7400619journal_volume
7pub_type
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