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Related Experiment Video

Updated: May 27, 2026

A Method for Remotely Silencing Neural Activity in Rodents During Discrete Phases of Learning

A Method for Remotely Silencing Neural Activity in Rodents During Discrete Phases of Learning

Published on: June 22, 2015

Dicer is dispensable for asymmetric RISC loading in mammals.

Juan G Betancur¹, Yukihide Tomari

¹Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.

RNA (New York, N.Y.)

|November 23, 2011

Summary

Mammalian Dicer is not required for asymmetric loading of small RNA duplexes into RNA-induced silencing complexes (RISC). This finding contrasts with the known mechanism in flies, suggesting a different pathway for RISC assembly in mammals.

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Area of Science:

Molecular Biology
RNA Interference
Gene Silencing

Background:

Asymmetric loading of small RNA duplexes into Argonaute2-containing RNA-induced silencing complexes (Ago2-RISC) in flies depends on the Dicer-2/R2D2 heterodimer.
This complex acts as a protein sensor for the thermodynamic stability of small RNA duplex ends.
The mechanism governing small RNA asymmetry sensing during mammalian RISC assembly is not well understood.

Purpose of the Study:

To investigate the role of Dicer in mammalian RISC assembly and function.
To determine if Dicer is essential for asymmetric small RNA loading in mammals.
To compare mammalian RISC assembly with the established pathway in flies.

Main Methods:

Quantitative analysis of RISC assembly in mammalian cells.
Assessment of target silencing activity in the presence and absence of Dicer.
In vitro and in vivo experiments to examine RISC loading mechanisms.

Main Results:

Mammalian Dicer is dispensable for asymmetric RISC loading.
RISC assembly and target silencing occur efficiently without Dicer in mammals.
This differs significantly from the Dicer-dependent pathway observed in flies.

Conclusions:

Mammalian Dicer does not play a role in sensing small RNA duplex asymmetry during RISC loading.
The mechanism of asymmetric RISC loading in mammals is distinct from that in flies.
Mammalian gene silencing pathways may utilize alternative mechanisms for small RNA selection.