AGO1-miR173 complex initiates phased siRNA formation in plants

Taiowa A. Montgomery, Jeon Yoo Seong, Noah Fahlgren, Sunny D. Gilbert, Miya D. Howell, Christopher M. Sullivan, Amanda Alexander, Goretti Nguyen, Edwards Allen, Hoon Ahn Ji, James C. Carrington

Research output: Contribution to journalArticlepeer-review

154 Citations (Scopus)


MicroRNA (miRNA)-guided cleavage initiates entry of primary transcripts into the transacting siRNA (tasiRNA) biogenesis pathway involving RNA-DEPENDENT RNA POLYMERASE6, DICER-LIKE4, and SUPPRESSOR OF GENE SILENCING3. Arabidopsis thaliana TAS1 and TAS2 families yield tasiRNA that form through miR173-guided initiation-cleavage of primary transcripts and target several transcripts encoding pentatricopeptide repeat proteins and proteins of unknown function. Here, the TAS1c locus was modified to produce synthetic (syn) tasiRNA to target an endogenous transcript encoding PHYTOENE DESATURASE and used to analyze the role of miR173 in routing of transcripts through the tasiRNA pathway. miR173 was unique from other miRNAs in its ability to initiate TAS1c-based syn-tasiRNA formation. A single miR173 target site was sufficient to route non-TAS transcripts into the pathway to yield phased siRNA. We also show that miR173 functions in association with ARGONAUTE 1 (AGO1) during TAS1 and TAS2 tasiRNA formation, and we provide data indicating that the miR173-AGO1 complex possesses unique functionality that many other miRNA-AGO1 complexes lack.

Original languageEnglish
Pages (from-to)20055-20062
Number of pages8
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number51
Publication statusPublished - 2008 Dec 23


  • Arabidopsis
  • Microrna
  • Transacting sirna

ASJC Scopus subject areas

  • General


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