IdeoCoverage

🧬 IdeoCoverage is a Python-based tool for visualizing chromosome ideograms with integrated coverage information from BED files. It highlights centromeric and telomeric regions using cytoband annotations and shows whether these critical genomic features are covered or not.

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✨ Features

• Draws scaled chromosome ideograms (chr1–22, X, Y)
• Highlights:
  • 🟥 Covered / Uncovered centromeres
  • 🟩 Covered / Uncovered telomeres
  • 🔷 BED coverage regions
• Uses cytoband files to annotate centromeres and telomeric regions
• Generates high-resolution SVG plots
• Adds minor ticks and a clean legend for publication-quality visuals

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🛠️ Requirements

• Python 3.7+
• Packages:
  • matplotlib
  • pandas
  • pybedtools # needs bedtools installed on your system (for pybedtools to work)
  • pyfaidx

Install dependencies:

pip install -r requirements.txt

📦 Usage

python3 coverage_ideogram.py \
    --fasta path/to/reference.fasta \
    --bed path/to/regions.bed \
    --cytoband path/to/cytoBand.txt \
    --output coverage_ideogram.svg

Example

python3 coverage_ideogram.py \
    --fasta hg19.fa \
    --bed example.bed \
    --cytoband cytoBand.txt \
    --output ideogram_output.svg

✅ Inputs

Argument	Description
--fasta	Reference genome FASTA file (like hg19.fasta)
--bed	BED file containing regions of interest (like regions.bed)
--cytoband	Cytoband annotation file (UCSC-style hg19_cytoBand.txt)
--output	Output image filename (recommended: .svg)

🖼️ Example Output

• When full fasta file is provided:

• When specific chromosome fasta file is provided:

🌐 Cytoband Files

You can download a cytoband file from the UCSC Table Browser:

• cytoBand.txt for hg19
• cytoBand.txt for hg38

🙏 Acknowledgements

• UCSC Genome Browser — for cytoband annotations
• pyfaidx — for efficient FASTA file parsing
• pybedtools — for BED file manipulation
• matplotlib — for visualization
• pandas — for data handling

📜 License

This project is licensed under the MIT License.