Quantification of cDNA on GMR biosensor array towards point-of-care gene expression analysis.

Quantification of cDNA on GMR biosensor array towards point-of-care gene expression analysis.
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在GMR生物传感器阵列上对cDNA的定量cDNA对护理基因表达分析的定量。

DOI:
10.1016/j.bios.2018.09.050
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发表时间:
2019-04-01
影响因子:
12.6
通讯作者:
Wang SX
Wang SX
中科院分区:
工程技术1区
文献类型:
--
作者:
Ravi N;Rizzi G;Chang SE;Cheung P;Utz PJ;Wang SX

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即时基因表达分析对于疾病的快速诊断非常重要,但传统技术受到多重分析能力、笨重的设备和成本的限制。我们提出了一个使用巨磁阻(GMR)生物传感器阵列的基因表达分析平台,它允许通过具有成本效益的磁检测进行多重转录检测和定量。在这项工作中,我们表征了参考基因 GAPDH 的 GMR 上聚合酶链式反应 (PCR) 扩增的互补 DNA (cDNA) 的灵敏度、动态范围和定量准确性。使用合成的 GAPDH 单链 DNA (ssDNA) 标准品来校准检测,并对 ssDNA 稀释液进行 qPCR 扩增以获得标准曲线。我们证明,GMR 平台为 15 和 18 循环扩增的合成 GAPDH PCR 产物提供了 4 个数量级的动态范围和分别为 1 pM 和 0.1 pM 的检测限。细胞系 RNA GMR 分析的定量结果通过 qPCR 得到证实。
Gene expression analysis at the point-of-care is important for rapid disease diagnosis, but traditional techniques are limited by multiplexing capabilities, bulky equipment, and cost. We present a gene expression analysis platform using a giant magnetoresistive (GMR) biosensor array, which allows multiplexed transcript detection and quantification through cost-effective magnetic detection. In this work, we have characterized the sensitivity, dynamic range, and quantification accuracy of Polymerase chain reaction (PCR)-amplified complementary DNA (cDNA) on the GMR for the reference gene GAPDH. A synthetic GAPDH single-stranded DNA (ssDNA) standard was used to calibrate the detection, and ssDNA dilutions were qPCR-amplified to obtain a standard curve. We demonstrate that the GMR platform provides a dynamic range of 4 orders of magnitude and a limit of detection of 1 pM and 0.1 pM respectively for 15 and 18-cycle amplified synthetic GAPDH PCR products. The quantitative results of GMR analysis of cell-line RNA were confirmed by qPCR.
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