Speedy, Specific, Synchronous Sensing Platforms with Ruthenium Complexes for Multiplexed MicroRNA Detection

Area of Science:

• Analytical Chemistry
• Biochemistry
• Materials Science

Background:

• MicroRNA-185 (miR-185) detection was previously achieved using Ru(II)-based compounds.
• Breast cancer progression is linked to miR-221 and miR-222, necessitating effective detection methods.

Purpose of the Study:

• To develop novel Ru(II)-based analytical platforms for simultaneous detection of miR-221/222.
• To investigate Ru(II) compounds with enhanced structural features for improved sensing capabilities.

Main Methods:

• Molecular simulation docking to predict nucleic acid binding affinity.
• Formation of P-DNA@Ru sensing platforms using FAM/ROX-tagged DNA probes.
• Detection mechanism validation via luminescence decay, fluorescence anisotropy, and PAGE.

Main Results:

• Ru 2 and Ru 3 compounds facilitated the discernment of complementary P-DNA sequences for miR-221/222.
• Achieved limit of detection (LOD) in the nanomolar range with specific and rapid responses.
• Demonstrated simultaneous and synchronous detection of both miR-221 and miR-222 sequences.

Conclusions:

• The P-DNA@Ru 2/3 systems provide an efficient and time-saving method for simultaneous microRNA detection.
• The developed platforms satisfy the need for speedy diagnosis in medical practice.
• Enhanced Ru(II) compounds offer a promising avenue for advanced biosensing applications.