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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 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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RNA Structure01:23

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The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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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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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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DNA Nanostructures for siRNA Delivery.

Bharath Raj Madhanagopal1, Sarah Youssef1, Arun Richard Chandrasekaran1,2

  • 1Department of Nanoscale Science and Engineering, University at Albany, State University of New York, Albany, New York 12222, United States.

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This summary is machine-generated.

DNA nanostructures offer a promising solution for delivering small interfering RNA (siRNA) drugs, overcoming limitations like poor stability and distribution for treating genetic disorders.

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Area of Science:

  • Biotechnology
  • Nanomedicine
  • Molecular Biology

Background:

  • Small interfering RNAs (siRNAs) are potent nucleic acid drugs for genetic disorders.
  • Naked siRNA faces challenges including low biostability, rapid clearance, and poor biodistribution.
  • Nanocarriers, particularly DNA nanostructures, are explored to enhance siRNA delivery.

Purpose of the Study:

  • To review the application of DNA nanostructures for targeted small interfering RNA (siRNA) delivery.
  • To discuss the design, loading, and release strategies of DNA nanocarriers for siRNA therapeutics.
  • To survey diseases targeted by siRNA-loaded DNA nanostructures and highlight challenges.

Main Methods:

  • Review of recent literature on DNA nanostructures for siRNA delivery.
  • Analysis of nanostructure design principles for drug loading and release.
  • Evaluation of pharmacodynamic and pharmacokinetic properties of DNA nanocarriers.
  • Survey of in vitro and in vivo studies targeting various diseases.

Main Results:

  • DNA nanostructures offer tunable size, shape, and morphology for precise siRNA loading.
  • Functionalization enables targeted delivery and stimulus-responsive release of siRNA.
  • Studies demonstrate effective in vitro and in vivo delivery of siRNA using DNA nanocarriers.
  • Various diseases have been targeted, showing therapeutic potential.

Conclusions:

  • DNA nanostructures represent a versatile platform for enhancing siRNA drug delivery.
  • Optimized nanocarrier design is crucial for improving therapeutic efficacy and overcoming delivery barriers.
  • Further research is needed to address challenges for clinical translation of siRNA-based nanomedicine.