Haplotype-Contained PCR Products Analysis by Sequencing with Selective Restriction of Primer Extension

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• Haplotype analysis is crucial for understanding genetic variations.
• Analyzing adjacent heterozygous loci in PCR products presents technical challenges.
• Existing methods may have limitations in speed and accuracy for complex haplotype determination.

Purpose of the Study:

• To develop and validate a new strategy for haplotype analysis of PCR products with two adjacent heterozygous loci.
• To assess the feasibility of using specific primers, allele-specific primers, and ddNTP-blocked primers for this analysis.
• To provide a simple, fast, and effective technology for haplotype identification in clinical settings.

Main Methods:

• Development of a haplotype analysis strategy using specific primers, allele-specific primers, and ddNTP-blocked primers.
• Validation using two sets of PCR products with adjacent heterozygous SNPs: UGT1A1*6 (rs4148323) and UGT1A1*28 (rs8175347); K1637K (rs11176013) and S1647T (rs11564148).
• Comparison of Sanger sequencing with allele-specific primers and pyrosequencing with ddNTP-blocked primers.

Main Results:

• Haplotypes for UGT1A1*6 and UGT1A1*28 were successfully analyzed using Sanger sequencing with allele-specific primers.
• Haplotypes for K1637K and S1647T could not be determined by Sanger sequencing but were successfully analyzed by pyrosequencing with ddNTP-blocked primers.
• The developed method effectively haplotypes two adjacent heterozygous PCR products, proving simple, fast, and independent of pyrosequencing read length.

Conclusions:

• The proposed strategy effectively analyzes haplotypes of two adjacent heterozygous PCR products.
• This method offers a promising new technology for haplotype identification in conventional PCR products from clinical samples.
• The approach is simple, fast, and overcomes limitations associated with short read lengths in pyrosequencing.