EpiSAFARI

EpiValley: Epigenetic Valley Detection and Functional Annotation

EpiValley detects valley patterns in genome-wide epigenetic signal profiles to identify cis-regulatory elements, including enhancers and insulators, and characterize regulatory landscapes.

Key Features:

• Sensitive Detection: Identifies valleys within histone modification and DNA methylation profiles to localize cis-regulatory elements.
• Novel Smoothing Method: Applies signal smoothing to reduce noise from sparse signals, mappability bias, and nucleotide content variation, improving valley detection accuracy.
• Performance and Accuracy: Detects histone modification valleys with high cross-species conservation, enriched transcription factor binding, and elevated nascent transcription activity.
• Functional Insights: Identifies clustered histone valleys at promoters of developmentally associated genes and correlates differential valleys with cell line-specific DNase signals.
• DNA Methylation Valleys: Detects conserved DNA methylation valleys enriched for transcription factors associated with chromatin structure.

Scientific Applications:

• Regulatory Element Annotation: Annotates functional genomic elements by systematically identifying epigenetic valleys overlooked by conventional pipelines, supporting studies of gene regulation, developmental biology, and epigenetic modification.

Methodology:

Processes dense genome-wide epigenetic signal profiles using a computational framework that mitigates technical biases and sparsity to precisely detect and annotate regulatory valleys.