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Related Concept Videos

siRNA - Small Interfering RNAs02:30

siRNA - Small Interfering RNAs

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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...
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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...
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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.
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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Related Experiment Video

Updated: Mar 24, 2026

In Vitro Selection of Engineered Transcriptional Repressors for Targeted Epigenetic Silencing
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Precise and efficient siRNA design: a key point in competent gene silencing.

E Fakhr1,2, F Zare1,2, L Teimoori-Toolabi2

  • 1Department of Medical Biotechnology, Faculty of Advanced Medical Technologies, Tehran University of Medical Sciences, Tehran, Iran.

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|March 19, 2016
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Summary

Designing effective short interfering RNA (siRNA) involves combining multiple algorithms and criteria. This approach enhances gene silencing efficiency, though success is not guaranteed.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Bioinformatics

Background:

  • RNA interference (RNAi) is a powerful gene silencing technique.
  • Designing effective short interfering RNA (siRNA) sequences is crucial for successful RNAi.
  • Existing algorithms and online tools aim to improve siRNA design, but optimal strategies are still sought.

Purpose of the Study:

  • To review common algorithms and online software for siRNA design.
  • To highlight factors influencing siRNA efficacy, including target site characteristics and siRNA structure.
  • To introduce a novel scoring system for enhancing siRNA design.

Main Methods:

  • Literature review of existing siRNA design algorithms and online tools.
  • Analysis of factors contributing to siRNA efficiency, such as target region proximity to the transcription start site, nucleotide composition, off-target effects, and secondary structures.
  • Evaluation of siRNA structural features like asymmetry and energy valley.
  • Introduction and experimental application of a new scoring system.

Main Results:

  • Combining multiple design criteria and tools generally yields more effective siRNAs.
  • Specific sequence and structural features, including target site proximity and siRNA energy profiles, correlate with increased efficiency.
  • No single method guarantees effective siRNA design, but meticulous application of algorithms and scoring systems improves outcomes.

Conclusions:

  • Optimizing siRNA design requires a multifaceted approach, integrating various computational tools and experimental criteria.
  • A comprehensive scoring system, considering multiple efficacy factors, can aid in selecting superior siRNA candidates.
  • Utilizing multiple siRNAs targeting the same gene can lead to more robust gene silencing.