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Overview Of Cell Separation And Isolation01:20

Overview Of Cell Separation And Isolation

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Automatic Single-Cell Harvesting for Fetal Nucleated Red Blood Cell Isolation on a Self-Assemble Cell Array (SACA)

Hsin-Yu Yang1,2, Che-Hsien Lin1, Yi-Wen Hu1

  • 1Department of Engineering and System Science, National Tsing Hua University, Hsinchu 30013, Taiwan.

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|January 8, 2025
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Summary

This study introduces a novel Self-Assembled Cell Array (SACA) chip for non-invasive prenatal testing (NIPT). The SACA chip efficiently isolates fetal nucleated red blood cells (FnRBCs) from maternal blood for accurate genetic analysis.

Keywords:
FnRBCNIPTSTRsingle-cell isolation

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Area of Science:

  • Genetics
  • Biotechnology
  • Medical Diagnostics

Background:

  • Traditional prenatal screening methods like serum biomarkers and amniocentesis have limitations in detection rates and safety.
  • Non-invasive prenatal testing (NIPT) using maternal blood is a promising alternative but faces challenges due to low fetal cell abundance.
  • Accurate isolation of fetal cells from maternal circulation is crucial for advancing NIPT.

Purpose of the Study:

  • To develop and validate a novel microfluidic platform for efficient isolation of fetal nucleated red blood cells (FnRBCs).
  • To enable reliable non-invasive prenatal testing (NIPT) through single-cell isolation and genetic analysis.
  • To overcome the technical challenges associated with low fetal cell concentration in maternal blood.

Main Methods:

  • Introduction of a Self-Assembled Cell Array (SACA) chip, a microfluidic system utilizing lateral flow dynamics and gravity for cell alignment.
  • Integration of a multi-channel fluorescence scanning module for real-time imaging and molecular profiling.
  • Utilizing specific markers (Hoechst+/CD71+/HbF+/CD45-) for precise enrichment and isolation of FnRBCs at the single-cell level.

Main Results:

  • The SACA chip system demonstrated a 31.2% reduction in non-target cell displacement and achieved 97.85% single-cell capture accuracy.
  • High purity of isolated cells was achieved, overcoming detection limits for short tandem repeat (STR) analysis.
  • The platform successfully isolated FnRBCs from 2 mL of maternal blood, enabling STR analysis within 120 minutes.

Conclusions:

  • The SACA chip, coupled with an automated imaging system, efficiently isolates single FnRBCs from maternal blood for NIPT.
  • This method offers higher purification efficiency compared to existing NIPT techniques.
  • The SACA chip platform shows significant potential for advancing prenatal diagnostics and other clinical applications.