1. [Trans-acting short interfering RNAs].
- Author
-
Warkocki Z and Figlerowicz M
- Subjects
- Gene Expression Profiling methods, Plants genetics, RNA Interference physiology, RNA Processing, Post-Transcriptional genetics, RNA, Plant genetics, RNA-Dependent RNA Polymerase genetics, RNA-Induced Silencing Complex genetics, Transcription, Genetic genetics, Gene Expression Regulation, Plant physiology, MicroRNAs genetics, RNA, Small Interfering genetics, Trans-Activators genetics
- Abstract
RNA is now considered a key factor in the regulation of gene expression. There are several classes of small regulatory RNAs in plants, functioning in posttranscriptional gene silencing (PTGS) or epigenetic DNA modification. Trans-acting short interfering RNAs (tasiRNAs) form a class of small regulatory RNAs which has been distinguished only recently. To date, five genes encoding tasiRNAs have been identified in Arabidopsis thaliana. TasiRNAs derive from non-coding RNA precursors which are initially targeted for cleavage by a miRNA. Cleavage products are then converted into dsRNAs by a RNA dependent RNA polymerase and sequentially cleaved into 21-nt tasiRNAs. Like the majority of plant miRNAs, tasiRNAs regulate gene expression at the posttranscriptional level, guiding cleavage of ARF and PPR transcripts. Here, we briefly present tasiRNAs and speculate whether they form a homogeneous class of siRNAs.
- Published
- 2006