A real-time PCR-based noninvasive prenatal RHD screening assay optimized for population-specific RHD allelic spectra...

Area of Science:

• Genetics
• Molecular Biology
• Immunology

Background:

• Noninvasive prenatal RhD screening is crucial for managing RhD-associated hemolytic disease of the fetus and newborn (HDFN).
• Current screening methods face challenges in the Chinese population due to RHD allelic diversity and assay design limitations.

Purpose of the Study:

• To develop and optimize a real-time PCR assay for noninvasive prenatal RHD genotyping tailored to the Chinese population.
• To accurately determine fetal RHD status, enabling better risk stratification and management of HDFN.

Main Methods:

• Developed a real-time PCR assay targeting RHD exons 5, 9, and 10 for simultaneous detection of paternally inherited RHD alleles.
• Optimized the assay to accommodate clinically relevant RHD alleles in the Chinese population, including RHD*01N.01, RHD*01N.03, and RHD*01EL.01.

Main Results:

• The assay demonstrated accurate prediction of fetal RHD status across various maternal genotypes.
• Successfully identified fetal RHD status in pregnancies involving common RhD-negative alleles specific to the Chinese population.

Conclusions:

• A novel methodological framework for noninvasive prenatal RHD genotyping optimized for East Asian populations has been established.
• The assay's design, incorporating exon 5, shows potential for broader applicability in genetically diverse populations, including African populations, pending validation.