A novel BRCA1 gene deletion detection in human breast carcinoma MCF-7 cells through FRET between quantum dots and silver nanoclusters

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BRCA1 (breast cancer 1) genomic deletions are the most important founder mutations in breast cancer patients and can be passed to you from your mother or father. Herein, we report a silver nanoclusters-based (AgNCs-based) fluorescence resonance energy transfer (FRET) method for detection of BRCA1 gene deletion. The method relies on the specific hybridization of DNA-AgNCs fluorescent probe to deleted genes and interaction between double stranded DNA-AgNCs and QD, and the signal amplification through energy transfer from fluorescent AgNCs to QDs during FRET. Such fabricated QDs/DNA-AgNCs interaction might be beneficial for the nanomaterials based biosensing methods Under best possible conditions a linear correlation was established between the fluorescence intensity and the concentration of deletion sequence in the range of 5.0 × 10−13–1.0 × 10−9 M with a detection limit of 1.2 × 10−13 M. Using this method, we could effectively determine gene deletions by using the nonamplified genomic DNAs that were extracted from the MCF-7 as a breast cancer cell line.

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