Improved library preparation protocols for amplicon sequencing-based noninvasive fetal genotyping for RHD-positive D...

Area of Science:

• Molecular Biology
• Genetics
• Bioinformatics

Background:

• Fetal RHD genotyping is crucial for managing RhD hemolytic disease.
• Conventional ligation-based methods for attaching sequencing adaptors are time-consuming and costly.
• Existing protocols are susceptible to PCR and sequencing errors, impacting reliability.

Purpose of the Study:

• To simplify the fetal RHD genotyping protocol by replacing ligation with a PCR-based adaptor attachment method.
• To enhance protocol reliability and robustness using unique molecular indexes (UMIs).
• To reduce the impact of PCR and sequencing errors in fetal RHD genotyping.

Main Methods:

• Development of a novel PCR-based method for Illumina sequencing adaptor ligation.
• Integration of unique molecular indexes (UMIs) into the PCR amplification process.
• Validation of the modified protocol for fetal RHD genotyping.

Main Results:

• The new protocols significantly reduced processing time and cost compared to the conventional method.
• UMI-based duplicate removal effectively minimized erroneously mapped sequence reads.
• The modified protocols demonstrated improved reliability and robustness.

Conclusions:

• The simplified and robust fetal RHD genotyping protocol facilitates clinical implementation.
• This advancement is particularly beneficial for the East Asian population.
• The use of UMIs enhances the accuracy of genetic analysis by mitigating PCR and sequencing errors.