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Related Concept Videos

Labeling DNA Probes03:31

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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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MicroRNA Amplification and Recognition through Locked-nucleic-acid In situ Hybridization as a Novel Detection and Quantification Method
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Rapid miRNA imaging in cells using fluorogenic templated Staudinger reaction between PNA-based probes.

Katarzyna Gorska1, Nicolas Winssinger

  • 1Laboratoire de Chemie Organique et Bioorganique, Institut de Science et d'Ingénierie Supramoléculaires, Université Louis Pasteur, Strasbourg, France.

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Summary

This study presents a fast fluorescent detection method for microRNAs (miRNAs) in human cells. Peptide nucleic acid (PNA) probes utilize a bioorthogonal Staudinger reaction for sensitive and specific miRNA sensing.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Biology

Background:

  • Nucleic acid sequence-templated reactions offer a promising approach for sensitive nucleic acid detection.
  • The Staudinger reaction, utilizing an azide-quenched fluorophore and phosphine, is bioorthogonal and biocompatible, making it suitable for biological applications.
  • Cellular RNAs can act as templates to promote the Staudinger reaction, enabling signal amplification through multiple catalytic turnovers.

Purpose of the Study:

  • To develop a rapid and efficient method for fluorescent detection of microRNAs (miRNAs) in human cells.
  • To leverage Peptide Nucleic Acids (PNAs) as a versatile platform for creating specific miRNA detection probes.
  • To utilize the bioorthogonal Staudinger reaction for sensitive and selective miRNA sensing.

Main Methods:

  • Design and synthesis of PNA-based probes functionalized with an azide-quenched fluorophore.
  • Application of the Staudinger ligation reaction, specifically reductive unquenching, for miRNA detection.
  • Utilizing trialkylphosphine as the reducing agent to activate the Staudinger reaction in the presence of target miRNAs.
  • Detection of miRNAs within intact human cells using fluorescent readouts.

Main Results:

  • Demonstrated fast fluorescent detection of specific miRNAs in human cells.
  • Peptide nucleic acids (PNAs) proved effective as stable and easily conjugatable probes for miRNA sensing.
  • The PNA-templated Staudinger reaction enabled sensitive detection via reductive unquenching of bis-azidorhodamine.
  • Achieved high specificity and efficiency in cellular miRNA detection.

Conclusions:

  • PNA-based probes combined with the Staudinger reaction provide a robust platform for rapid and sensitive miRNA detection in human cells.
  • This approach offers a valuable tool for studying miRNA function and disease in complex biological systems.
  • The developed protocol facilitates efficient and specific fluorescent reporting of miRNA presence.