Detailed Information |
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| Standard Gene Set Name | HOWELL_TASIRNA_DIFF |
| Species | Arabidopsis thaliana |
| Brief Description | Differentially regulated -Targeted by tasiRNA (Table S1 PubmedID:17400893) |
| Full Description/Abstract | Posttranscriptional RNA silencing of many endogenous transcripts, viruses, and transgenes involves the RNA-DEPENDENT RNA POLYMERASE6/DICER-LIKE4 (RDR6/DCL4)-dependent short interfering RNA (siRNA) biogenesis pathway. Arabidopsis thaliana contains several families of trans-acting siRNAs (tasiRNAs) that form in 21-nucleotide phased arrays through the RDR6/DCL4-dependent pathway and that negatively regulate target transcripts. Using deep sequencing technology and computational approaches, the phasing patterns of known tasiRNAs and tasiRNA-like loci from across the Arabidopsis genome were analyzed in wild-type plants and silencing-defective mutants. Several gene transcripts were found to be routed through the RDR6/DCL4-dependent pathway after initial targeting by one or NA miRNAs or tasiRNAs, the most conspicuous example of which was an expanding clade of genes encoding pentatricopeptide repeat (PPR) proteins. Interestingly, phylogenetic analysis using Populus trichocarpa revealed evidence for small RNA¨Cmediated regulatory mechanisms within a similarly expanded group of PPR genes. We suggest that posttranscriptional silencing mechanisms operate on an evolutionary scale to buffer the effects of rapidly expanding gene families |
| External Pathway ID/Pubmed ID | 17400893 |
| Source | Literature |
| Contributor/Author | Liming Lai and Xijin Ge |
| Organization of contributer | South Dakota State University |
| External URL | http://www.plantcell.org/cgi/reprint/19/3/926 |