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Development of a new biochip array for APOE4 classification from plasma samples using immunoassay-based methods.

Sigrun Badrnya1, Tara Doherty2, Ciaran Richardson2

  • 1Centre of Physiology and Pharmacology, Institute of Physiology, Medical University of Vienna, Vienna, Austria.

Clinical Chemistry and Laboratory Medicine
|December 10, 2017
PubMed
Summary
This summary is machine-generated.

A novel biochip array technology (BAT) assay accurately identifies Apolipoprotein E4 (APOE4) status from plasma in under 3 hours. This rapid method offers a superior alternative to PCR for APOE genotyping, aiding in disease risk assessment.

Keywords:
APOE4 phenotypingapolipoprotein E4biochipblood testcardiovascular diseasedementiagenetic risk factorlate-onset Alzheimer’s diseasemultiarrayneurodegeneration

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Area of Science:

  • Biochemistry
  • Genetics
  • Medical Diagnostics

Background:

  • Apolipoprotein E (APOE) is crucial for lipid transport and metabolism, with APOE4 being a significant genetic risk factor for dementia and neurodegenerative diseases.
  • Accurate and rapid APOE4 classification is essential for assessing disease risk and guiding treatment.
  • Existing genotyping methods can be time-consuming, highlighting the need for faster diagnostic tools.

Purpose of the Study:

  • To develop and validate a rapid, reliable assay for APOE4 status classification directly from plasma.
  • To evaluate the performance of biochip array technology (BAT) for APOE4 detection.

Main Methods:

  • Simultaneous immunoassay-based detection of specific APOE4 and total APOE levels in plasma using biochip array technology (BAT).
  • Comparison of BAT results with polymerase chain reaction (PCR) genotyping in 432 samples.
  • Calculation of the ratio of APOE4 to total APOE protein to determine E4 allele status (null, heterozygous, or homozygous).

Main Results:

  • BAT successfully identified APOE4 status directly from plasma within 3 hours.
  • The assay achieved 100% sensitivity and specificity in classifying samples across two independent centers.
  • BAT results correlated perfectly with PCR-based genotyping, demonstrating high accuracy.

Conclusions:

  • Chemiluminescent biochip-based sandwich immunoarray offers a novel, rapid, and accurate platform for APOE4 status detection from plasma.
  • This BAT assay is a superior alternative to PCR-based APOE genotyping, with potential for integration into broader protein biomarker arrays for disease analysis.
  • Accurate APOE4 status determination can inform presymptomatic risk assessment, prognosis, and treatment response for various diseases, including Alzheimer's disease.