dnAQET

dnAQET evaluates de novo genome assemblies by aligning scaffolds and contigs to a reference genome to compute unified quality metrics reflecting misassemblies, alignment coverage, redundancy, and overall reference genome coverage.

Key Features:

• Unified Quality Metric: Provides a consolidated measure to benchmark the quality of de novo assemblies.
• Scaffold/Contig Evaluation: Calculates individual quality scores for each scaffold or contig based on alignments to a reference genome, including detection of misassemblies and alignment percentage.
• Overall Assembly Score: Computes an aggregated quality score for the entire assembly incorporating overall reference genome coverage, the distribution of scaffold quality scores, and redundancy.
• Alignment-Based Scoring: Uses reference-based alignments to identify misassemblies and to quantify alignment coverage per scaffold or contig.
• Quality Score Calculation: Derives individual scores from factors explicitly including sequence length, misassembly frequency, and alignment coverage.
• Aggregated Assembly Quality: Integrates individual scaffold/contig scores with metrics such as genome coverage and redundancy to produce a composite assembly score.

Scientific Applications:

• Benchmarking de novo assemblers: Enables comparison of assembly quality across different de novo assembly tools using a unified metric.
• Assembly selection: Supports selection of higher-quality assemblies from multiple candidates based on individual scaffold/contig and overall assembly scores.
• Validation and comparative evaluation on reference datasets: Applied to synthetic assemblies from the latest human genome build, different reference genome versions for five organisms, and six de novo assemblies for sample NA24385, and compared to 13 other frequently used measures to assess sensitivity to misassemblies, redundancy, contig length, and coverage.

Methodology:

Each scaffold or contig is aligned to a reference genome to identify misassemblies and calculate alignment percentages; individual quality scores are computed from length, misassembly frequency, and alignment coverage; overall assembly quality is obtained by integrating individual scores with metrics such as genome coverage and redundancy.