Improved Nanopore full-length cDNA sequencing by PCR-suppression.

Area of Science:

• Molecular Biology
• Genomics
• Bioinformatics

Background:

• Full-length transcript sequencing is a key goal in RNA sequencing.
• Long-read sequencing technologies like Oxford Nanopore Technologies face challenges in achieving high efficiency for full-length transcripts.
• Library preparation, not RNA degradation, limits full-length transcript recovery.

Purpose of the Study:

• To improve the efficiency of full-length transcript sequencing using Oxford Nanopore Technologies.
• To adapt a PCR-based strategy for enhancing cDNA library preparation.
• To increase the yield of full-length RNA sequencing reads.

Main Methods:

• Adapted a method involving inverted terminal repeats in cDNA during reverse transcription.
• Implemented single-primer PCR to create a PCR suppression effect.
• Applied this strategy to Nanopore cDNA library preparation.

Main Results:

• Achieved increased PCR efficiency in Nanopore cDNA library preparation.
• Demonstrated dramatically improved gene body coverage.
• Showed enrichment of longer transcripts by preventing amplification of shorter molecules.

Conclusions:

• A simple PCR strategy significantly enhances full-length RNA sequencing data quality.
• This method makes full-length transcript sequencing feasible for a majority of sequenced reads.
• Improved library preparation is crucial for maximizing the potential of long-read sequencing technologies.