NanoMark

NanoMark benchmarks de novo genome assembly methods for nanopore sequencing data to evaluate hybrid and non-hybrid pipeline performance using Escherichia coli K-12 MinION and Illumina datasets.

Key Features:

• Benchmarking Framework: Provides an extensible framework for systematic comparison of genome assemblers using standardized metrics.
• Hybrid and Non-Hybrid Evaluation: Evaluates five non-hybrid assembly pipelines and two hybrid assemblers that scaffold Illumina short-read assemblies with nanopore data.
• Dataset Utilization: Uses publicly available Escherichia coli K-12 datasets sequenced on Oxford Nanopore MinION and Illumina platforms.
• Coverage Analysis: Assesses nanopore coverages at 20×, 30×, 40×, and 50× to determine coverage effects on assembly accuracy.
• Performance Metrics: Reports that hybrid methods are less sensitive to nanopore data quality and perform well at lower coverages, whereas non-hybrid methods require >40× coverage but offer reduced computational time compared to methods designed for nanopore reads.

Scientific Applications:

• Assembly Strategy Selection: Guides choice between hybrid and non-hybrid assembly approaches for projects combining nanopore and Illumina data.
• Coverage Planning: Informs required nanopore coverage (20×–50×) for reliable de novo assembly of bacterial genomes such as Escherichia coli K-12.
• Comparative Performance Assessment: Enables evaluation of assembler sensitivity to nanopore read quality and sequencing coverage.

Methodology:

Tests five non-hybrid and two hybrid assembly pipelines on Escherichia coli K-12 MinION and Illumina datasets across nanopore coverages of 20×, 30×, 40×, and 50× and records standardized performance metrics.