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Sample-sparing multiplexed antibody Fc biomarker discovery using a reconfigurable integrated microfluidic platform.

Hanhao Zhang1, Divya Bhakta1, Anushka Saha1

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Summary

Researchers developed a novel microfluidic device for high-throughput screening of antibody biomarkers. This technology enables sensitive detection of infectious diseases using minimal sample volumes, advancing biomarker discovery for conditions like schistosomiasis.

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Area of Science:

  • Biomarker Discovery
  • Immunology
  • Microfluidics

Background:

  • Endemic infectious disease control requires sensitive, specific, and accessible biomarkers.
  • Antibody fragment crystallizable (Fc) regions, including glycosylation, show promise as pathogen-specific biomarkers.
  • Current Fc feature screening methods are often impractical due to high sample volume, cost, and expertise requirements.

Purpose of the Study:

  • To develop a simple, flexible, and reconfigurable microfluidic device for high-throughput, multiplexed screening of antibody features.
  • To enable discovery of biomarkers targeting both antibody fragment antigen-binding (Fab) and Fc regions.
  • To overcome limitations of existing methods for large-scale antibody Fc feature screening.

Main Methods:

  • A microfluidic device was fabricated using rapid prototyping techniques, integrating an antigen microarray with reconfigurable microfluidics.
  • The device performs highly multiplexed assays (1400 total) measuring 100 antibody Fab and Fc features from a small sample volume (15 μL).
  • Features screened include antigen specificity, antibody isotypes, subclasses, N-glycosylation, and Fc receptor binding.

Main Results:

  • The device demonstrated cleanroom-free fabrication and ease of use comparable to standard immunoassay platforms.
  • Performance was validated against existing methods.
  • Biomarker screening for schistosomiasis identified antibody subclass-based biomarkers distinguishing current infection from former infection and endemic controls.

Conclusions:

  • The developed microfluidic device offers a simple, efficient, and scalable solution for antibody biomarker discovery.
  • It significantly reduces sample volume and complexity compared to traditional methods.
  • The device successfully identified novel biomarkers for schistosomiasis, demonstrating its potential for controlling endemic infectious diseases.