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Neutral DNA-avidin nanoparticles as ultrasensitive reporters in immuno-PCR.
Analyst ( IF 3.6 ) Pub Date : 2020-06-05 , DOI: 10.1039/d0an00134a
Dimple Chavan 1 , Hui Chen , Mary Crum , Binh Vu , Mohammad Safari , Maxwell Smith , Peter Vekilov , Jacinta C Conrad , Katerina Kourentzi , Richard C Willson
Affiliation  

We have developed an immuno-PCR based diagnostic platform which couples detection antibodies to self-assembled, ultra-detectable DNA–avidin nanoparticles stabilized with poly(ethylene glycol) to link DNA amplification to target protein concentration. Electrostatic neutralization and cloaking of the PCR-amplifiable DNA labels by avidin and PEG coating reduces non-specific “stickiness” and enhances assay sensitivity. We further optimized the detectability of the nanoparticles by incorporating four repeats of a unique synthetic DNA PCR target into each nanoparticle. Using human chorionic gonadotropin hormone (hCG) as a model analyte, this platform was able to quantitate the target hCG protein in femtomolar concentrations using only standard laboratory equipment.

中文翻译:

中性 DNA-亲和素纳米颗粒作为免疫 PCR 中的超灵敏报告基因。

我们开发了一种基于免疫 PCR 的诊断平台,该平台将检测抗体与用聚乙二醇稳定的自组装、超可检测 DNA 亲和素纳米颗粒偶联,将 DNA 扩增与目标蛋白浓度联系起来。通过抗生物素蛋白和 PEG 涂层对 PCR 扩增 DNA 标记进行静电中和和遮盖,可减少非特异性“粘性”并提高测定灵敏度。我们通过将独特的合成 DNA PCR 靶标的四个重复序列合并到每个纳米颗粒中,进一步优化了纳米颗粒的可检测性。该平台使用人绒毛膜促性腺激素 (hCG) 作为模型分析物,仅使用标准实验室设备即可定量飞摩尔浓度的目标 hCG 蛋白。
更新日期:2020-07-13
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