OmicsBox Genetic Variation Module

The OmicsBox Genetic Variation Module by BioBam is a comprehensive, end-to-end platform for identifying and analyzing genetic variations within a population or species. Designed for researchers working with both model and non-model organisms, it covers the full workflow from raw sequencing data to population-level insights, including variant calling, filtering, annotation, phasing, imputation, genome-wide association studies (GWAS), and population structure analysis — all within a single unified platform.

The module supports both Genotype By Sequencing (GBS) and Whole Genome Sequencing (WGS) data, making it versatile for projects that require reduced genomic complexity or thorough genome-wide variant discovery. Its combination of industry-leading tools has been benchmarked against alternative pipelines and shown to deliver superior performance in recent peer-reviewed studies.

Variant Calling

• Choose between two leading algorithms: BCFtools mpileup and FreeBayes for fast and accurate variant detection from alignment files
• Supports mixed-ploidy variant calling via the FreeBayes option
• Accommodates different methodological requirements including genome coverage, presence of repetitive regions, and level of ploidy
• Generates VCF output files accompanied by quality control charts for result visualization
• Supports GBS data filtering via the dDocent pipeline

Variant Filtering and VCF File Management

• Remove low-quality variants based on user-defined standards applied to different fields within the VCF file
• Merge multiple VCF files to create a unified and complete dataset
• Extract essential information from large VCF files for faster and more accurate downstream analysis
• Perform phasing and imputation of variants using Beagle to ensure data integrity

Variant Annotation for Model and Non-Model Organisms

• Annotate variants using the Variant Effect Predictor (VEP) from Ensembl to gather coding and genetic consequence information
• Requires only the reference genome used in the variant calling step and the corresponding annotation file
• Applicable to both model and non-model species

Genome-Wide Association Studies (GWAS)

• Perform guided GWAS using the GAPIT3 R package in an accessible, step-by-step manner
• Associate genetic variants with quantitative traits or diseases
• Enrich GWAS insights through Gene Set Analysis (GSA) powered by MAGMA, revealing associations between genetic variants and phenotypes at the gene-set level

Population Structure Analysis

• Analyze individuals' genetic composition and ancestry proportions within a population using ADMIXTURE
• Understand population-level genetic diversity and relatedness

End-to-End Workflow

1. Start from FASTQ or alignment files and proceed through variant calling with BCFtools or FreeBayes
2. Merge, extract, filter, phase, and impute VCF files as needed
3. Annotate variants with VEP for functional consequence information
4. Perform GWAS to associate variants with phenotypic traits
5. Conduct Gene Set Analysis and Population Structure Analysis for deeper biological insights

OmicsBox runs out of the box on standard PCs and laptops across Windows, Linux, and Mac operating systems, requiring no specialized infrastructure. The Genetic Variation Module is available as part of the broader OmicsBox platform, with free trial and custom demo options available for new users.