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Computer Numerical Control Micromilling of a Microfluidic Acrylic Device with a Staggered Restriction for Magnetic Nanoparticle-Based Immunoassays

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MicroRNA in vitro diagnostics using immunoassay analyzers.

Andreas Kappel¹, Christina Backes², Yiwei Huang¹

¹Corporate Technology, Siemens AG, Erlangen, Germany;

Clinical Chemistry

|January 25, 2015

Summary

A new immunoassay accurately measures microRNA (miRNA) signatures for Alzheimer disease detection. This sensitive and specific assay runs on standard equipment, offering a rapid diagnostic solution for clinical practice.

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High Throughput MicroRNA Profiling: Optimized Multiplex qRT-PCR at Nanoliter Scale on the Fluidigm Dynamic ArrayTM IFCs

High Throughput MicroRNA Profiling: Optimized Multiplex qRT-PCR at Nanoliter Scale on the Fluidigm Dynamic ArrayTM IFCs

Published on: August 3, 2011

Area of Science:

Biochemistry
Molecular Biology
Clinical Diagnostics

Background:

Biomarker implementation is crucial for medical research and healthcare cost reduction.
Many discovered biomarkers are not routinely used due to incompatible measurement systems.
Standardized and clinically compatible assays are needed for novel biomarker adoption.

Purpose of the Study:

To develop a novel immunoassay for microRNA (miRNA) quantification.
To ensure the assay is compatible with standard clinical laboratory analyzers.
To evaluate the clinical performance of the assay for Alzheimer disease biomarkers.

Main Methods:

Designed a streptavidin-microparticle-based immunoassay for miRNA detection.
Utilized a biotinylated oligonucleotide and a monoclonal antibody for specific miRNA capture and detection.
Validated the assay's technical performance and clinical utility using Alzheimer disease-related miRNAs.

Main Results:

Achieved high analytical specificity (99.4%) and sensitivity (1 pmol/L miRNA).
Demonstrated high reproducibility without amplification steps.
Provided a time to result of <3 hours and detected Alzheimer disease miRNAs with 82% accuracy.

Conclusions:

The developed miRNA immunoassay enables sensitive and specific measurement of miRNA signatures.
The assay is compatible with commonly available laboratory equipment, facilitating clinical workflow integration.
This method offers a promising tool for biomarker-based diagnostics, including for Alzheimer disease.