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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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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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Related Experiment Video

Updated: Nov 21, 2025

Preparation of Multifunctional Silk-Based Microcapsules Loaded with DNA Plasmids Encoding RNA Aptamers and Riboswitches
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Stabilization of RNA Encapsulated in Silk.

Jiuyang He1, Burcin Yavuz1, Jonathan A Kluge1,2

  • 1Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States.

ACS Biomaterials Science & Engineering
|January 15, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method to store fragile RNA molecules long-term using dried silk fibroin matrices. This technique preserves RNA integrity at elevated temperatures, simplifying storage and transport for diagnostic and therapeutic applications.

Keywords:
RNAbiologicssilkstabilization

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Area of Science:

  • Biomaterials Science
  • Molecular Biology
  • Biotechnology

Background:

  • Ribonucleic acid (RNA), including messenger RNA (mRNA) and microRNA (miRNA), is crucial for diagnostics and therapeutics.
  • RNA's inherent instability necessitates stringent, costly storage conditions (e.g., cold temperatures), hindering clinical and research applications.
  • Current preservation methods present challenges in terms of cost, logistical complexity, and maintaining RNA integrity.

Purpose of the Study:

  • To develop a cost-effective and simplified method for long-term RNA stabilization and transport.
  • To investigate the efficacy of silk fibroin matrices in preserving RNA integrity under various storage conditions.
  • To overcome the limitations of current RNA storage and handling protocols.

Main Methods:

  • Encapsulation of RNA within dried silk fibroin matrices using lyophilization and air-drying techniques.
  • Assessment of mRNA stability using real-time quantitative polymerase chain reaction (RT-qPCR) after storage at elevated temperatures (up to 45 °C).
  • Evaluation of silk concentration effects on RNA stability and quantification, including the impact on complementary DNA (cDNA) synthesis and resolution using RNA purification kits.

Main Results:

  • mRNA samples stored in lyophilized silk matrices demonstrated good stability for up to one week at 45 °C.
  • Silk fibroin at concentrations up to 4% w/v did not inhibit RNA quantification after purification, with higher silk concentrations enhancing thermal protection.
  • Air-dried silk fibroin matrices with higher silk content provided protection by excluding water, indicating a hydrophobic mechanism for preservation.

Conclusions:

  • Silk fibroin matrices offer a promising, simplified approach for the long-term storage and transportation of RNA samples.
  • This method enhances RNA stability, particularly at elevated temperatures, by primarily acting through a water exclusion mechanism.
  • The findings suggest a potential breakthrough in overcoming logistical and cost barriers associated with RNA preservation for widespread clinical and research use.