A dominant mutation in DCL1 suppresses the hyl1 mutant phenotype by promoting the processing of miRNA

Yuko Tagami, Hiroyasu Motose, Yuichiro Watanabe

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

MicroRNAs (miRNAs) are sequence-specific negative regulators of gene expression generated by DICER-LIKE1 (DCL1) with the assistance of a double-stranded RNA-binding protein, HYPONASTIC LEAVES1 (HYL1), in Arabidopsis. To achieve a better understanding of miRNA biogenesis, we isolated hyl1 suppressors. Our genetic screening identified a novel semidominant mutation in DCL1 (dcl1-13), which causes an amino acid substitution of Glu-395 with Lys in the ATPase/DExH-box RNA helicase domain. This mutation confers significant restoration from the developmental abnormality and a reduction in the level of miRNA in the loss-of-function mutant of HYL1. However, the dcl1-13 single mutant, exhibiting a decreased number of leaves, showed a slight decrease in miRNA accumulation. Thus, the effect of the dcl1-13 mutation is HYL1 dependent: it promotes miRNA processing in the absence of HYL1, but conversely, impairs it in the presence of HYL1. Our results suggest significant roles of the helicase domain of DCL1, which remain unclear to date, possibly in relation with HYL1.

Original languageEnglish
Pages (from-to)450-458
Number of pages9
JournalRNA
Volume15
Issue number3
DOIs
Publication statusPublished - Mar 2009

Keywords

  • DICER-LIKE1
  • HYPONASTIC LEAVES1
  • MicroRNA
  • Suppressor

ASJC Scopus subject areas

  • Molecular Biology

Fingerprint Dive into the research topics of 'A dominant mutation in DCL1 suppresses the hyl1 mutant phenotype by promoting the processing of miRNA'. Together they form a unique fingerprint.

  • Cite this