Genotyping single nucleotide polymorphisms using different molecular beacon multiplexed within a suspended core optical fiber
2014
Linh, V. | Giannetti, S. | Warren-Smith, S. | Cooper, A. | Selleri, S. | Cucinotta, A. | Monro, T.
We report a novel approach to genotyping single nucleotide polymorphisms (SNPs) using molecular beacons in conjunction with a suspended core optical fiber (SCF). Target DNA sequences corresponding to the wild- or mutant-type have been accurately recognized by immobilizing two different molecular beacons on the core of a SCF. The two molecular beacons differ by one base in the loop-probe and utilize different fluorescent indicators. Single-color fluorescence enhancement was obtained when the immobilized SCFs were filled with a solution containing either wild-type or mutant-type sequence (homozygous sample), while filling the immobilized SCF with solution containing both wild- and mutant-type sequences resulted in dual-color fluorescence enhancement, indicating a heterozygous sample. The genotyping was realized amplification-free and with ultra low-volume for the required DNA solution (nano-liter). This is, to our knowledge, the first genotyping device based on the combination of optical fiber and molecular beacons.
Show more [+] Less [-]Linh Viet Nguyen, Sara Giannetti, Stephen Warren-Smith, Alan Cooper, Stefano Selleri, Annamaria Cucinotta, and Tanya Monro
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