vvv2_align_SE, vvv2_align_PE/vvv2_display: Galaxy-Based Workflows and Tool Designed to Perform, Summarize and Visualize Variant Calling and Annotation in Viral Genome Assemblies

Abstract:

Background: Next-generation sequencing (NGS) analysis of viral samples generates results dispersed across multiple files—genome assembly, variant calling, and functional annotations—making integrated interpretation challenging. Variants often yield numerous low-frequency or non-significant variants, yet only a small fraction are biologically relevant. Virologists must manually sift through extensive data to identify meaningful mutations, a time-consuming and error-prone process. To address these practical challenges, we developed vvv2_display, a dedicated summarization and visualization tool, integrated within comprehensive Galaxy workflows. Results: vvv2_display streamlines variant interpretation by consolidating key results into two concise and interoperable outputs. The first output is a PNG image showing alignment coverage depth and genomic annotations, with significant variants displayed along the genome as symbols whose height reflects frequency and shape indicates the affected protein. At a glance, this enables virologists to identify all deviations from a reference viral genome. Each significant variant is assigned a unique identifier that directly links to the second output: a tab-separated (TSV) text file listing only high-confidence variants, with frequencies, flanking nucleotides, and impacted genes and proteins. This cross-referenced design supports rapid, accurate, and intuitive data exploration. Availability: vvv2_display is open source, available on Github and installable via Mamba.

SEEK ID: https://workflowhub.eu/publications/66

DOI: 10.3390/v17101385

Teams: ANSES-Ploufragan

Publication type: Journal Article

Journal: Viruses

Book Title: Viruses

Publisher: MDPI AG

Citation: Viruses 17(10):1385.

Date Published: 17th Oct 2025

Registered Mode: by DOI

Authors: Alexandre Flageul, Edouard Hirchaud, Céline Courtillon, Flora Carnet, Paul Brown, Béatrice Grasland, Fabrice Touzain

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Citation
Flageul, A., Hirchaud, E., Courtillon, C., Carnet, F., Brown, P., Grasland, B., & Touzain, F. (2025). vvv2_align_SE, vvv2_align_PE/vvv2_display: Galaxy-Based Workflows and Tool Designed to Perform, Summarize and Visualize Variant Calling and Annotation in Viral Genome Assemblies. In Viruses (Vol. 17, Issue 10, p. 1385). MDPI AG. https://doi.org/10.3390/v17101385
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Created: 1st Apr 2026 at 17:00

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