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Chapter 2 Label-free detection of Single Nucleotide Polymorphisms (SNPs): PNA Molecular Beacons In this chapter the application of modified PNAs for SNP detection is shown. PNA beacons allow to detect complementary DNA sequences without the necessity to label it before or after PCR amplification. Upon hybridization, in fact, these molecules emit a fluorescence signal which is highly enhanced if compared to that of the free unhybridized beacon. The probes here presented were designed in order to recognize a SNP which is diagnostic for the olive cultivar “Ogliarola Leccese”. Three beacons of different length were synthesized, in order to test the recognition performances in relation to the PNA length. The application in AE-HPLC, together with solution assays, allowed to identify the ideal length for specific and efficient DNA hybridization and to verify the PNA probes performances. After optimization of the method, the probe was applied to recognize the SNP in a sample of DNA extracted from olive leaves and amplified by PCR. It has been shown that this methodology can be applied to real samples. 39
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Contributions Publications includin