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Quantifying the benefit offered by transcript assembly with Scallop-LR on single-molecule long reads
Laura H Tung1,2, Mingfu Shao3, Carl Kingsford4
1Computational Biology Department, School of Computer Science, Carnegie Mellon University, Pittsburgh, 15213, PA, USA.
Genome Biology
|December 19, 2019
Summary
Long-read transcript assembly using Scallop-LR improves mRNA isoform identification. This novel method reveals more known and novel human transcriptome isoforms compared to existing tools.
Area of Science:
- Genomics
- Bioinformatics
- Molecular Biology
Background:
- Single-molecule long-read sequencing advances mRNA isoform identification.
- Incomplete cDNA synthesis and sequencing limits result in partial transcript reads.
- There is a need for effective long-read transcript assembly methods.
Purpose of the Study:
- To develop Scallop-LR, a reference-based assembler optimized for long reads.
- To evaluate the utility of long-read transcript assembly.
- To compare Scallop-LR with existing methods for human transcriptome analysis.
Main Methods:
- Optimized Scallop with long-read specific features to create Scallop-LR.
- Performed transcript assembly on 26 PacBio long-read samples.
- Compared Scallop-LR performance against Iso-Seq Analysis and StringTie.
Main Results:
- Scallop-LR identified a greater number of known human transcripts.
- Scallop-LR detected potentially novel isoforms of the human transcriptome.
- Quantified the benefits of transcript assembly specifically for long reads.
Conclusions:
- Long-read transcript assembly is crucial for a comprehensive transcriptome.
- Scallop-LR enhances the identification of known and novel mRNA isoforms.
- Scallop-LR provides a more complete view of the human transcriptome.
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