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- W2017647887 abstract "A highly sensitive and specific colorimetry-based rolling circle amplification (RCA) assay method for single-nucleotide polymorphism genotyping has been developed. A circular template is generated by ligation upon the recognition of a point mutation on DNA targets. An RCA amplification is then initiated using the circular template in the presence of Phi29 polymerase. The RCA product can be digested by a restricting endonuclease, and the cleaved DNA fragments can mediate the aggregation of gold nanoparticle-tagged DNA probes. This causes a colorimetric change of the solution as the indicator of the mutation occurrence, which can be detected using UV−vis spectroscopy or viewed by naked eyes. On the basis of the high amplification efficiency of Phi29 polymerase, a mutated target of ∼70 fM can be detected in this assay. In addition, the protection of the circle template using phosphorothioated nucleotides allows the digestion reaction to be performed simultaneously in RCA. Moreover, DNA ligase offers high fidelity in distinguishing the mismatched bases at the ligation site, resulting in positive detection of mutant targets even when the ratio of the wild-type to the mutant is 10 000:1. The developed RCA-based colorimetric detection scheme was demonstrated for SNP typing of β-thalassemia gene at position −28 in genomic DNA." @default.
- W2017647887 created "2016-06-24" @default.
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- W2017647887 date "2010-03-01" @default.
- W2017647887 modified "2023-09-30" @default.
- W2017647887 title "Rolling Circle Amplification Combined with Gold Nanoparticle Aggregates for Highly Sensitive Identification of Single-Nucleotide Polymorphisms" @default.
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- W2017647887 doi "https://doi.org/10.1021/ac100336n" @default.
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