Highly sensitive and selective oligonucleotide sensor for sickle cell disease gene using photon upconverting...

Area of Science:

• Biomedical Engineering
• Molecular Diagnostics
• Nanotechnology

Background:

• Sickle cell disease is a genetic disorder caused by a specific point mutation.
• Accurate and sensitive detection of this mutation is crucial for diagnosis and management.
• Existing diagnostic methods may have limitations in sensitivity or specificity.

Purpose of the Study:

• To design and develop a novel oligonucleotide sensor for detecting the point mutation associated with sickle cell disease.
• To utilize luminescence resonance energy transfer (LRET) for sensitive detection.
• To evaluate the sensor's specificity against mismatched targets and random sequences.

Main Methods:

• Development of an oligonucleotide sensor based on LRET.
• Utilizing photon upconverting nanoparticles (NaYF4 doped with Yb3+ and Er3+) as donors.
• Employing N,N,N',N'-tetramethyl-6-carboxyrhodamine (TAMRA) as the acceptor fluorophore.
• Testing sensor performance with perfectly matched and mismatched oligonucleotide targets.

Main Results:

• The sensor successfully detected the perfectly matched target sequence.
• High specificity was demonstrated, distinguishing the target from mismatched and random sequences.
• The sensor exhibited a low detection limit of 120 femtomoles for the perfectly matched target.
• No photobleaching was observed during detection, indicating stability.

Conclusions:

• The designed oligonucleotide sensor offers a highly sensitive and specific method for detecting sickle cell disease-associated point mutations.
• The LRET-based approach with upconverting nanoparticles and TAMRA is effective for molecular diagnostics.
• This sensor technology holds promise for improved diagnostic tools for genetic disorders.