SPP

SPP detects and refines protein-binding positions from ChIP-seq (Chromatin Immunoprecipitation Sequencing) data to improve spatial precision of binding-site calls and to assess sequencing-depth requirements for genome-wide protein-DNA interaction studies.

Key Features:

• Improved Tag Alignment: Enhances tag alignment to more accurately localize regions where proteins bind to DNA.
• Background Signal Correction: Applies background-signal correction to reduce noise and clarify true protein-binding signals.
• Peak Detection Algorithms: Evaluates and compares three peak-detection algorithms against established methods and incorporates strand-specific information to improve spatial precision.
• Strand-Asymmetric Tag Analysis: Considers the asymmetric distribution of tags on positive and negative DNA strands to refine binding-position estimates.
• Sequencing Depth Analysis: Analyzes the relationship between sequencing depth and characteristics of detected binding sites to estimate required depth for desired coverage.
• R-script Implementation: Provided as R scripts for computational analysis of ChIP-seq data.
• Validation on Transcription Factors: Applied and validated using data sets from three transcription factors for binding-site identification and characterization.

Scientific Applications:

• Transcription Factor Binding-Site Identification: Detects and characterizes transcription factor binding sites genome-wide from ChIP-seq data.
• Protein-DNA Interaction Mapping: Improves mapping of protein-DNA interactions to support studies of gene regulation and epigenetics.
• Experimental Design and Sequencing Planning: Provides sequencing-depth estimates to optimize ChIP-seq experimental design and coverage for binding-site detection.

Methodology:

Implemented as R scripts that perform improved tag alignment, background-signal correction, comparison of three peak-detection algorithms including strand-specific analysis exploiting asymmetric tag distributions on positive and negative DNA strands, and sequencing-depth analysis relating depth to detected binding-site characteristics.