PscanChIP

PscanChIP identifies and characterizes DNA-binding sites of transcription factors from ChIP-Seq genomic regions, evaluating motif enrichment and positional bias to elucidate transcriptional regulatory interactions.

Key Features:

• Motif Scanning and Enrichment Analysis: Scans genomic regions using position-specific frequency matrices (e.g., JASPAR, TRANSFAC) or user-provided motifs and computes statistical motif enrichment.
• Positional Bias Evaluation: Assesses positional bias within ChIP-Seq peaks to determine preferred TF binding locations and distinguish primary from secondary or cooperative sites.
• Identification of Secondary Motifs: Detects secondary motifs corresponding to additional transcription factors that may co-bind or cooperatively regulate the same genomic regions.

Scientific Applications:

• Mapping TF Binding Landscapes: Provides detailed maps of transcription factor binding sites from ChIP-Seq data to inform studies of gene expression regulation.
• Characterizing Regulatory Motif Interactions: Characterizes primary and secondary sequence motifs to aid analysis of TF cooperativity and transcriptional regulatory networks.

Methodology:

PscanChIP applies de novo motif discovery and predefined motif scanning using known TF binding specificity descriptors (position-specific frequency matrices) to analyze motifs and positional distributions in ChIP-Seq–derived regions.