Olink PEA Technology Principles and Data Analysis Process

In the field of multiplex protein detection, Olink has become a mainstream platform for clinical cohort studies and biomarker discovery based on its unique Proximity Extension Assay (PEA) technology. Olink PEA technology combines dual antibody specific recognition, nucleic acid labeling, and high-sensitivity amplification detection to ensure detection throughput while maintaining quantitative accuracy. This article systematically analyzes the working principle of Olink PEA technology and introduces the commonly used data analysis process to help researchers understand and apply this technology more efficiently.

 

I. Principle of Olink PEA Technology

1. Core Concept of Olink PEA Technology

(1) PEA utilizes paired antibody probes, each connected with a unique oligonucleotide tag;

(2) When the two probes simultaneously bind to the same target protein, the oligonucleotides are in close proximity, allowing the formation of an amplifiable sequence through DNA polymerization;

(3) This sequence is subsequently detected using qPCR or NGS, achieving high sensitivity and low background signal output.

 

2. Advantages of Olink PEA Technology

(1) High specificity: Requires dual antibody binding, significantly reducing non-specific signals;

(2) High throughput: A single reaction can cover hundreds to thousands of proteins;

(3) Low sample requirement: Only 1-3 μL of plasma or serum needed per analysis;

(4) Wide dynamic range: Covers protein concentrations across ten orders of magnitude.

 

3. Classification of Olink PEA Detection Platforms

(1) Target or Focus panels based on qPCR, suitable for medium to low throughput studies involving tens to hundreds of proteins;

(2) Explore and Explore HT platforms based on NGS, supporting high-throughput analysis of 3,000+ proteins.

 

II. Overview of PEA Experimental Process

1. Sample Processing in Olink PEA Technology

(1) Serum, plasma, or other body fluids are preprocessed according to standard procedures;

(2) Strict control of inter-batch differences to ensure consistency in downstream analysis.

 

2. Reaction Steps of Olink PEA Technology

(1) Add antibody probes to pair and bind to the target protein;

(2) The oligonucleotide tags in close proximity generate an amplification template through DNA polymerization;

(3) The template is amplified and converted into a readable signal (qPCR or NGS).

 

3. Signal Readout in Olink PEA

(1) qPCR Method: Achieves relative quantification through Cq values;

(2) NGS Method: Achieves a wider dynamic range and high throughput through sequencing tag counts (UMI correction).

 

III. Olink Data Analysis Process

1. Raw Data Processing

(1) Generate Cq or reads matrix from qPCR or NGS readouts;

(2) Remove technical noise (e.g., blank wells and internal controls).

 

2. NPX (Normalized Protein eXpression) Calculation

(1) Standard Olink algorithms normalize each protein signal to eliminate batch effects;

(2) Output log-transformed relative expression values (NPX) for easy comparison between samples.

 

3. Downstream Analysis

(1) Differential analysis: Group comparisons to identify candidate biomarkers;

(2) Pathway enrichment: Analyze functional networks using KEGG/Reactome;

(3) Multi-omics integration: Combine with transcriptomics and metabolomics data.

 

IV. Applications of Olink PEA Technology and Support from Biotage Biotech

1. Applicable Research Scenarios

(1) Cohort studies: Analysis of protein expression profiles in large-scale population samples;

(2) Drug development: Screening biomarkers in pharmacodynamics, toxicology, and mechanism studies;

(3) Clinical translation: Validation of early diagnostic biomarkers.

 

2. Service Advantages of Biotage Biotech

(1) Supports the full range of Olink Target, Explore, and Explore HT platforms;

(2) Provides one-stop services from experimental design, quality control to bioinformatics analysis;

(3) Delivers data results directly usable for publication and project applications.

 

Biotage Biotech - A premium service provider of bioproduct characterization, multi-omics mass spectrometry detection

 

Related Services:

Olink Proteomics