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The microRNA miR-243 directs poly(UG) modification of a somatic mRNA in C. elegans

David D Lowe1, Martin Newman2, Gary Ruvkun1,3

  • 1Genetics, Harvard Medical School, Boston, MA, USA.

Micropublication Biology
|August 29, 2025
PubMed

Insights

The microRNA miR-243 guides the enzyme RDE-3 to add poly UG tails to specific messenger RNAs (mRNAs). This process, known as pUGylation, leads to gene silencing in C. elegans.

Area of Science:

  • Molecular Biology
  • Genetics
  • RNA Biology

Background:

  • The RNA interference (RNAi) pathway utilizes double-stranded RNA (dsRNA) to trigger gene silencing.
  • The enzyme RDE-3 in *C. elegans* is known to add poly UG tails to messenger RNAs (mRNAs) destined for silencing via the dsRNA-initiated RNA interference pathway.
  • RDE-3 also modifies some endogenous cellular mRNAs with p(UG) tails, but the targeting mechanisms remain unclear.

Purpose of the Study:

  • To elucidate the mechanisms that direct RDE-3 to specific mRNAs for pUGylation.
  • To investigate the role of small regulatory RNAs in guiding RDE-3 activity.
  • To understand how pUGylation contributes to gene regulation.

Main Methods:

  • Investigating the interaction between microRNA miR-243 and the mRNA y47h10a.5.
  • Analyzing the pUGylation activity of RDE-3 in response to miR-243.
  • Assessing the impact of miR-243-directed pUGylation on mRNA silencing.

Main Results:

  • The study demonstrates that the microRNA miR-243 directs the pUGylation of the intestine-specific mRNA y47h10a.5.
  • This pUGylation event mediated by miR-243 leads to the silencing of the y47h10a.5 mRNA.
  • Genome-encoded small regulatory RNAs, such as miRNAs, serve as a mechanism to direct RDE-3 to specific mRNAs.

Conclusions:

  • MicroRNA miR-243 is a key regulator that targets RDE-3 for the pUGylation and subsequent silencing of specific mRNAs.
  • This finding reveals a novel mechanism of gene regulation involving small regulatory RNAs and the pUGylation activity of RDE-3.
  • The study highlights the intricate interplay between miRNAs and RNA processing enzymes in controlling gene expression in *C. elegans*.

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