Molecular beacon-based bioimaging of multiple microRNAs during myogenesis

Area of Science:

• Molecular Biology
• Biochemistry
• Cell Biology

Background:

• MicroRNAs (miRNAs) play crucial roles in cellular functions and disease development.
• Monitoring miRNA biogenesis is essential for understanding cellular processes like differentiation.
• Existing methods for miRNA detection can be limited in simultaneous, real-time analysis.

Purpose of the Study:

• To design and validate a novel molecular beacon (MB) system for the simultaneous detection of specific microRNAs (miRNAs).
• To investigate the biogenesis of miR-206 and miR-26a during myogenic differentiation using the developed MBs.
• To establish a fluorescent imaging approach for monitoring multiple miRNAs in live cells.

Main Methods:

• Development of stem-loop structured DNA probes (MBs) with fluorophore-quencher pairs targeting miR-206 and miR-26a.
• Transfection of C2C12 cells with miRNA-26a MB (6-FAM-BHQ1) and miRNA-206 MB (Texas Red-BHQ2).
• In vitro and in vivo fluorescence analysis to detect changes in fluorescence signals upon miRNA hybridization.

Main Results:

• Significantly increased fluorescence signals were observed in differentiated single C2C12 cells when incubated with individual or both MBs.
• The increased fluorescence confirmed the specific hybridization of miR-206 and miR-26a with their respective MBs, leading to fluorescence activation.
• The MB system demonstrated effective simultaneous monitoring of two distinct miRNAs in a cellular context.

Conclusions:

• The developed MB-based system enables simultaneous imaging and monitoring of multiple miRNAs, such as miR-206 and miR-26a.
• This approach provides a sensitive and specific tool for studying miRNA dynamics during cellular processes like myogenic differentiation.
• The MB imaging system holds potential as a novel probe for investigating various cellular and disease processes involving miRNAs.