echtvar

echtvar encodes and compresses population variants and associated annotations to enable rapid annotation and filtering of SNPs and indels in large-scale germline and somatic genomic datasets.

Key Features:

• Compressed Variant Representation: Encodes most genetic variants (chromosome location, position, and alleles) into 32-bit representations, reducing size to roughly half of earlier encoding schemes and at least four times smaller than naive encodings.
• Annotation Compression: Stores annotations within the same compact archive and compresses them alongside variant data to conserve space and speed access.
• Rapid Annotation and Filtering: Leverages the compressed format to rapidly annotate and filter SNPs and indels, yielding faster processing times compared to existing tools.
• Reduction of Candidate Variants: Narrows the set of candidate variants through efficient encoding and filtering to streamline downstream analyses.

Scientific Applications:

• Germline variant analysis: Annotation and filtering of germline variants in individuals and cohorts.
• Somatic variant analysis: Annotation and filtering of somatic variants in individuals and cohorts.
• Large-scale cohort studies: Handling population-scale (terabyte-scale) variant datasets where computational efficiency is required for annotation and interpretation.
• Exploratory variant filtering: Facilitating exploratory data analysis by reducing candidate variant lists for downstream interpretation.

Methodology:

Variants (chromosome, position, alleles) are encoded into a 32-bit compressed representation and annotations are stored and compressed within the same compact archive for use in rapid annotation and filtering.