vcfcache 0.4.1

Cache-based VCF annotation accelerator

VCFcache – Cache once, annotate fast

Cache common variants once, reuse them for every sample. VCFcache builds a normalized blueprint, annotates it once, and reuses those results so only rare/novel variants are annotated at runtime.

Performance: With 60-90% cache hit rates on typical samples, VCFcache achieves 2-10× speed-ups compared to standard annotation pipelines. Cache lookups are constant-time operations regardless of cache size, making the tool highly scalable. See WIKI.md for the detailed runtime efficiency model.

Works with any genome/build (human, mouse, plants, model organisms) as long as your inputs and annotation pipeline use the same reference/contig naming.

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Quick Start - pip install

Requires: Python >= 3.11 (earlier versions untested), bcftools >= 1.20

pip install vcfcache
vcfcache demo --smoke-test  # Run comprehensive demo
vcfcache --help

Install bcftools separately:

• Ubuntu/Debian: sudo apt-get install bcftools
• macOS: brew install bcftools
• Conda: conda install -c bioconda bcftools

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Quick Start - Docker

Docker includes bcftools - no separate installation needed.

docker pull ghcr.io/julius-muller/vcfcache:latest

# List available public caches
docker run --rm ghcr.io/julius-muller/vcfcache:latest list caches

# Use a public cache from Zenodo
docker run --rm -v $(pwd):/work ghcr.io/julius-muller/vcfcache:latest \
  annotate \
    -a cache-hg38-gnomad-4.1joint-AF0100-vep-115.2-basic \
    --vcf /work/sample.vcf.gz \
    --output /work/out 

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Quick Start - from source

git clone https://github.com/julius-muller/vcfcache.git
cd vcfcache
uv venv .venv && source .venv/bin/activate
uv pip install -e ".[dev]"
vcfcache --help

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Build Your Own Cache

1. Create blueprint (normalize/deduplicate variants):

vcfcache blueprint-init --vcf gnomad.bcf --output ./cache -y params.yaml

2. Annotate blueprint (create cache):

vcfcache cache-build --name vep_cache --db ./cache -a annotation.yaml -y params.yaml

3. Use cache on samples:

vcfcache annotate -a ./cache/cache/vep_cache --vcf sample.vcf.gz --output ./results

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Configuration

Override system bcftools (if needed):

export VCFCACHE_BCFTOOLS=/path/to/bcftools-1.22

Change where downloaded caches/blueprints are stored (default: ~/.cache/vcfcache):

export VCFCACHE_DIR=/path/to/vcfcache_cache_dir

Or in params.yaml:

bcftools_cmd: "/path/to/bcftools"

See WIKI.md for detailed configuration, cache distribution via Zenodo, and troubleshooting.

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Links

• Documentation: WIKI.md
• Source: https://github.com/julius-muller/vcfcache
• Issues: https://github.com/julius-muller/vcfcache/issues
• Docker: ghcr.io/julius-muller/vcfcache