Droplet Digital PCR-Based Chimerism Analysis for Primary Immunodeficiency Diseases

Area of Science:

• Molecular Biology
• Transplantation Immunology

Background:

• Hematopoietic stem cell transplantation (HSCT) requires precise monitoring of donor/recipient chimerism.
• Accurate assessment of chimerism is crucial for evaluating transplant success and managing patients.

Purpose of the Study:

• To develop and validate droplet digital PCR (ddPCR) methods for accurate chimerism analysis in HSCT patients.
• To assess male/female chimerism and disease-specific chimerism using ddPCR.

Main Methods:

• Developed ddPCR assays targeting SRY and RPP30 for male/female chimerism detection.
• Developed mutation-specific ddPCR assays for four primary immunodeficiency diseases.
• Validated ddPCR accuracy against conventional methods and dilution assays.

Main Results:

• ddPCR accurately determined male/female chimerism, showing high concordance with fluorescence in situ hybridization and short tandem repeat-PCR.
• The ddPCR method demonstrated high sensitivity, proving effective for analyzing small patient samples, including sorted leukocyte subpopulations.
• Mutation-specific ddPCR assays accurately detected post-transplant chimerism for specific diseases.

Conclusions:

• ddPCR is a valuable and simple method for analyzing chimerism in allogeneic HSCT.
• These ddPCR assays facilitate early and precise monitoring of post-transplant chimerism, particularly in disease-specific leukocyte fractions.