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Updated: Jul 23, 2026
Quantitative FRET (Förster Resonance Energy Transfer) Analysis for SENP1 Protease Kinetics Determination
Published on: February 21, 2013
Antisense activity detection by inhibition of fluorescence resonance energy transfer
M L Benítez-Hess1, J A DiPaolo, L M Alvarez-Salas
1Laboratorio de Terapia Genica, Departamento de Genetica y Biologia Molecular, Centro de Investigacion y de Estudios Avanzados, Av. IPN 2508, Mexico D.F. 07360, Mexico.
Abstract:
Use of antisense nucleic acids to modulate expression of particular genes is a promising approach to the therapy of human papillomavirus type 16 (HPV-16)-associated cervical cancer. Understandably, evaluation of the in vivo performance of synthetic antisense oligodeoxynucleotides (AS-ODNs) or ribozymes is of ultimate importance to development of effective antisense tools. Here we report the use of a bacterial reporter system based on the inhibition of fluorescence resonance energy transfer (FRET) to measure the interaction of AS-ODNs with HPV-16 target nt 410-445, using variants of the green fluorescent protein (GFP). An optimal FRET-producing pair was selected with GFP as the donor and yellow fluorescent protein (YFP) as the acceptor molecule. Hybridization of AS-ODNs with a chimaeric mRNA containing the antisense target site flanked by GFP variants resulted in the inhibition of the FRET effect. Use of different linkers suggested that the amino acid content of the linker has no significant effect on FRET effect. Antisense accessibility, tested by RNaseH assays with phosphorothioated target-specific and mutant AS-ODNs, suggested a specific effect on the chimaeric mRNA. FRET inhibition measurements correlated with the presence of truncated proteins confirming true antisense activity over the target. Therefore, FRET inhibition may be used for the direct measurement of AS-ODNs activity in vivo.
Insights
Researchers developed a novel bacterial reporter system using fluorescence resonance energy transfer (FRET) to measure antisense oligodeoxynucleotides (AS-ODNs) activity. This method effectively quantifies AS-ODN interaction with HPV-16 targets, aiding in cervical cancer therapy development.
Area of Science:
- Molecular Biology
- Biotechnology
- Antisense Therapeutics
Background:
- Antisense nucleic acids offer a promising therapeutic strategy for HPV-16-associated cervical cancer.
- Evaluating the in vivo performance of synthetic antisense oligodeoxynucleotides (AS-ODNs) is crucial for developing effective antisense tools.
Purpose of the Study:
- To develop and validate a bacterial reporter system for measuring AS-ODN activity in vivo.
- To assess the interaction of AS-ODNs with HPV-16 target sequences using fluorescence resonance energy transfer (FRET).
Main Methods:
- Utilized a bacterial reporter system employing variants of green fluorescent protein (GFP) and yellow fluorescent protein (YFP) to generate a FRET signal.
- Designed a chimaeric mRNA containing the HPV-16 antisense target site flanked by GFP variants.
- Measured FRET inhibition upon hybridization of AS-ODNs with the target mRNA.
- Validated AS-ODN activity using RNaseH assays and analysis of truncated protein products.
Main Results:
- A FRET-producing pair (GFP donor, YFP acceptor) was optimized for the reporter system.
- Hybridization of AS-ODNs with the chimaeric mRNA resulted in significant FRET inhibition.
- Linker composition did not significantly affect the FRET effect.
- FRET inhibition measurements correlated with specific antisense activity, confirmed by truncated protein formation.
Conclusions:
- FRET inhibition serves as a reliable method for directly measuring AS-ODN activity in vivo.
- This reporter system facilitates the evaluation of AS-ODNs for potential therapeutic applications against HPV-16-associated cervical cancer.
