DANPOS

DANPOS detects genome-wide changes in nucleosome position, occupancy, and fuzziness at single-nucleotide resolution to analyze chromatin organization.

Key Features:

• Genome-wide comparative analysis: Performs comparative analysis of nucleosome maps across genomic contexts to identify differences between samples or conditions.
• Single-nucleotide resolution: Detects nucleosome position changes with single-nucleotide precision.
• Nucleosome occupancy quantification: Quantifies nucleosome enrichment (occupancy) across the genome.
• Phasing and fuzziness analysis: Evaluates nucleosome phasing (regularity) and fuzziness (variability in positioning).
• Integration with epigenetic and mutation data: Integrates genome-wide epigenetic profiles with mutation data from tumor-normal pairs for comparative analyses.
• Detection of broad H3K4me3 peaks: Identifies broad H3K4me3 peaks associated with transcription elongation and enhancer activity.
• Application to large cohorts and clinical samples: Supports integrative analysis involving large tumor-normal cohorts (for example, >8,200 pairs) and experimental clinical data.

Scientific Applications:

• Chromatin architecture studies: Maps nucleosome positioning, occupancy, and fuzziness to investigate chromatin organization and structural regulation.
• Cancer epigenomics: Identifies mutation-independent epigenetic signatures in tumor-normal datasets and associates broad H3K4me3 peaks with pan-cancer tumor suppressors such as TP53 and PTEN and with cell type-specific tumor suppressors.
• Transcriptional regulation and enhancer analysis: Detects broad H3K4me3 marks indicative of increased transcription elongation and enhancer activity linked to high gene expression.

Methodology:

Performs comparative analysis of nucleosome maps and integrates genome-wide epigenetic profiles with mutation data from tumor-normal pairs to identify changes, including broad H3K4me3 peaks.