EncyclopeDIA

EncyclopeDIA constructs and uses chromatogram libraries to analyze Data Independent Acquisition (DIA) mass spectrometry data for peptide identification and quantification.

Key Features:

• Chromatogram library construction: Builds chromatogram libraries that encode fragment ion chromatographic peak shapes and retention times for detectable peptides.
• Fragment ion and retention time encoding: Captures detailed fragment ion chromatographic peak shapes and calibrated retention times for every detectable peptide in an experiment.
• Calibration of databases and libraries: Calibrates protein databases and spectrum libraries to specific mass spectrometer configurations and chromatography setups.
• DIA-only analytical pipelines: Enables analysis workflows that rely solely on DIA data, reducing dependence on Data Dependent Acquisition (DDA) methods.
• Reuse of global resource libraries: Standardizes parameters to allow reuse of global spectrum or chromatogram libraries across different experiments.
• Dual search capability: Searches peptides using either DDA-based spectrum libraries or DIA-based chromatogram libraries.
• Improved peptide detection: Exploits calibrated retention times and fragmentation specificity to increase peptide detection rates by approximately 20–25% compared to DDA-based spectrum library searches.

Scientific Applications:

• Proteomics identification and quantification: Improves peptide and protein identification and quantification from DIA mass spectrometry data.
• Cellular biology studies: Supports proteome-level analyses in human and yeast cell experiments.
• Disease biomarker discovery: Enhances peptide detection sensitivity for biomarker discovery applications.
• Systems biology: Provides broader proteomic coverage for systems-level investigations.

Methodology:

Construct chromatogram libraries encoding fragment ion chromatographic peak shapes and retention times; calibrate protein databases or spectrum libraries to mass spectrometer configurations and chromatography setups; search peptides using DDA-based spectrum libraries or DIA-based chromatogram libraries while exploiting calibrated retention times and fragmentation specificity.