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RNA Interference

RNA Interference

RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...

RNA Interference

RNA Interference

RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...

Experimental RNAi

Experimental RNAi

RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...

siRNA - Small Interfering RNAs

siRNA - Small Interfering RNAs

Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...

Small interfering RNAs (siRNA)

Small interfering RNAs (siRNA)

Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...

piRNA - Piwi-interacting RNAs

piRNA - Piwi-interacting RNAs

PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...

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Related Experiment Video

Updated: Jul 15, 2026

MISSION esiRNA for RNAi Screening in Mammalian Cells

MISSION esiRNA for RNAi Screening in Mammalian Cells

Published on: May 12, 2010

Design of active small interfering RNAs.

Andrew S Peek¹, Mark A Behlke

¹Integrated DNA Technologies Inc, 1710 Commercial Park, Coralville, IA 52241, USA.

Current Opinion in Molecular Therapeutics

|April 27, 2007

Summary

Small interfering RNAs (siRNAs) offer a powerful method for gene silencing. Careful design and chemical modifications enhance siRNA efficacy and specificity, minimizing off-target effects for reliable gene expression research.

Area of Science:

Molecular Biology
Genetics
Biotechnology

Background:

Small interfering RNAs (siRNAs) are widely used for gene expression suppression.
Designing effective siRNAs requires careful consideration of target site selection and sequence features.

Purpose of the Study:

To outline best practices for designing potent and specific siRNAs.
To discuss strategies for minimizing off-target effects and improving siRNA stability.

Main Methods:

Review of sequence features contributing to siRNA potency.
Utilizing computational tools for siRNA design and screening.
Assessment of chemical modifications for enhanced siRNA function.

Main Results:

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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids

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Chitosan/Interfering RNA Nanoparticle Mediated Gene Silencing in Disease Vector Mosquito Larvae

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Published on: March 25, 2015

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MISSION esiRNA for RNAi Screening in Mammalian Cells

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Published on: May 12, 2010

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids

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Chitosan/Interfering RNA Nanoparticle Mediated Gene Silencing in Disease Vector Mosquito Larvae

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Specific sequence features enhance siRNA potency.

Computational tools aid in rational siRNA design.

Chemical modifications improve stability and reduce off-target effects.

Conclusions:

Optimized siRNA design involves sequence analysis, homology screening, and chemical modification.
Effective siRNA use requires minimizing off-target effects and maximizing potency for reliable gene silencing.