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Encoded hydrogel microparticles with universal mismatch-incorporated DNA probes for highly specific multiplex detection of SNPs

Authors
Moon, Hyun JuneMun, Seok JoonLee, Jun HoRoh, Yoon HoLim, Yong JunBong, Ki Wan
Issue Date
1-8월-2022
Publisher
ELSEVIER
Keywords
Encoded hydrogel microparticles; Universal mismatch; Single nucleotide polymorphism; Multiplexed detection
Citation
TALANTA, v.245
Indexed
SCIE
SCOPUS
Journal Title
TALANTA
Volume
245
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/141695
DOI
10.1016/j.talanta.2022.123480
ISSN
0039-9140
Abstract
Hydrogel microparticle-based nucleic acid assays are an attractive detection platform based on their multiplexing capabilities with high sensitivity and specificity. A particular area of interest is single-nucleotide polymorphism (SNP) sensing, where multiple SNPs should be identified in a highly reliable yet economical manner. However, hydrogel microparticles leveraging probe-target hybridization as a key mechanism are hampered by small duplex stability differences arising from single base-pair mismatch. We have developed encoded hydrogel microparticles with DNA probes tailored for multiplex SNP detection. Within the DNA probes, we adopt a widely used base analog (5-nitroindole) so that it substitutes one of the base sequences among DNA probes. The effects of the modification of the probes' structure on SNP sensing has been tested from multiple perspectives, such as specificity, sensitivity, and available assay temperatures at a given ionic strength. We have validated that our hydrogel microparticles exhibit much higher specificity for a single base-pair mismatch with minimal reduction in sensitivity. Our particles can also detect multiple SNPs located in different target strands, which is a significant challenge for conventional particles.
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