A general method for nested RT-PCR amplification and sequencing the complete HCV genotype 1 open reading frame

Area of Science:

• Virology
• Molecular Biology
• Genetics

Background:

• Hepatitis C virus (HCV) is a genetically diverse flavivirus, with genotypes 1a and 1b prevalent in the USA.
• Understanding HCV genomic sequence is vital for correlating viral variation with disease pathology and therapeutic outcomes.
• Amplifying the HCV genome via RT-PCR presents challenges due to low template concentrations and high sequence diversity.

Purpose of the Study:

• To develop and optimize RT-PCR conditions for sensitive and specific amplification of the complete HCV open reading frame (ORF).
• To enable reliable sequencing of diverse HCV genotypes 1a and 1b from patient samples.

Main Methods:

• Systematic optimization of reverse transcription (RT) and nested PCR conditions for multiple overlapping amplicons.
• Development and testing of multiple nested PCR primer pairs for each amplicon.
• Optimization of sequencing primers for HCV genotypes 1a and 1b.
• Direct sequencing of amplified ORFs with high sequencing depth and bidirectional coverage.

Main Results:

• Achieved an average success rate of over 95% for amplifying HCV genotype 1a and 1b ORFs from 72 patient plasma samples.
• Successfully sequenced complete HCV ORFs from 72 patients with negligible sequencing errors.
• Controlled and monitored primer bias through careful primer design and experimental controls.

Conclusions:

• Developed optimized RT-PCR and sequencing protocols for rapid and reliable amplification and sequencing of HCV genotypes 1a and 1b ORFs.
• These optimized conditions are effective for studying viral genomic variations in clinical settings.