High-Density Serum/Plasma Reverse Phase Protein Arrays
In-depth exploration and characterization of human serum and plasma proteomes is an attractive strategy for the identification of potential prognostic or diagnostic biomarkers. The possibility of analyzing larger numbers of samples in a high-throughput fashion has markedly increased with affinity-based microarrays, thus providing higher statistical power to these biomarker studies. Here, we describe a protocol for high-density serum and plasma reverse phase protein arrays (RPPAs). We demonstrate how a biobank of 12,392 samples was immobilized and analyzed on a single microarray slide, allowing high-quality profiling of abundant target proteins across all samples in one assay.
Key wordsReverse phase protein array RPPA Serum Plasma Affinity proteomics Noncontact inkjet printer Protein profiling Fluorescent detection
We thank the Swedish Twin Registry for providing the serum samples. We also thank all members of the Plasma Profiling and the Auoimmunity Profiling groups at SciLifeLab, as well as the entire staff of the Human Protein Atlas. This study was funded by grants from Science for Life Laboratory, the Knut and Alice Wallenberg Foundation, and the KTH Center for Applied Proteomics (KCAP) funded by the Erling-Persson Family Foundation. The authors declare no conflict of interest.
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