Protein Biomarker Blood Test Accurately Detects Alzheimer’s Disease

Proximity extension assay (PEA) is a direct one-step protein quantification method using a pair of DNA oligonucleotides linked to antibodies against the target molecule. It requires polyclonal or two monoclonal antibodies that bind to target epitopes close enough to form a DNA duplex which is quantified by real-time PCR.

The results of the PEA analysis identified 429 proteins that were dysregulated in the plasma of AD patients. The investigators selected 19 "hub proteins" representative of the AD plasma protein profile, which were used to form the basis of a scoring system that accurately classified clinical AD (as characterized by the presence of amyloid, tau, phosphorylated tau, and neurodegeneration).

In addition to distinguishing AD patients from healthy individuals with more than 96% accuracy, the system could also differentiate among the early, intermediate, and late stages of AD and be used to monitor the progression of the disease over time.

"With the advancement of ultrasensitive blood-based protein detection technology, we have developed a simple, noninvasive, and accurate diagnostic solution for AD, which will greatly facilitate population-scale screening and staging of the disease," said senior author Dr. Nancy Ip, professor of life science at Hong Kong University of Science and Technology.

The plasma protein screening method for detection of Alzheimer’s disease was described in the May 25, 2021, online edition of Alzheimer's & Dementia: The Journal of the Alzheimer's Association.

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Hong Kong University of Science and Technology
University College London