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Sequence-specific DNA detection is important in various biomedical applications such as gene expression profiling, disease diagnosis and treat- ment, drug discovery and forensic analysis. Here we report a gold nanoparticle-based method that allows DNA detection and quantification and is capable of single nucleotide polymorphism (SNP) discrimination. The precise quantification of single- stranded DNA is due to the formation of defined nanoparticle-DNA conjugate groupings in the pre- sence of target/linker DNA. Conjugate groupings were characterized and quantified by gel electro- phoresis. A linear correlation between the amount of target DNA and conjugate groupings was found. For SNP detection, single base mismatch discrimination was achieved for both the end- and center-base mismatch. The method described here may be useful for the development of a simple and quanti- tative DNA detection assay.

Nanoparticle-based detection and quantification of DNA with single nucleotide polymorphism (SNP) discrimination selectivity