Proteomics and Biomarker Discovery Discovery to Targets for a Phosphoproteomic Signature Assay: One-stop shopping in Skyline Jake Jaffe Skyline Users Meeting.

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Presentation transcript:

Proteomics and Biomarker Discovery Discovery to Targets for a Phosphoproteomic Signature Assay: One-stop shopping in Skyline Jake Jaffe Skyline Users Meeting June 2013

Proteomics and Biomarker Discovery Idea: Phosphosignaling is coordinated!  Phosphosignaling is likely coordinated Kinase-substrate relationships tend to be 1-to-many A priori expectation of coordinate regulation of sites  Don’t need to monitor every phosphosite  Can we identify a few that we can reliably monitor? Go wide instead of deep

Proteomics and Biomarker Discovery Sites Treatments/Cell lines  Largest systematic set of perturbations with phosphoproteomics readout in existence Over 10,000 phosphosites observed  Over 1,200 sites present in >75% of all experiments Jinal Patel, Xiaodong Lu ‘Light’ Cells ‘Heavy’ Cells ‘Medium’ Cells Control DMSO Tx 1 Tx 2 MCF7 PC3 HL60 XX 26 drugs 2 repeats =

Dimensionality reduction: >1000 to 55 with 2x probe redundancy Roger Hu

Proteomics and Biomarker Discovery Now for the hard part… Building the P100 Assay

Proteomics and Biomarker Discovery Optimal Phosphosite Quant Requires Multiple Inputs  Level of phosphopeptide Picked “best” representative peptides from each cluster –Observability, site localization, etc.  Level of non-phosphophorylated cognate Picked based on above  Level of a non-involved peptide Control for protein level Gleaned from all in-house MaxQuant data

Proteomics and Biomarker Discovery Assay Optimization Strategy Identify and order peptides  Configure Skyline document Sequence identities Spectra libraries  Characterize peptides QC + establish RT properties  Refine spectral libraries  Configure final assay

Proteomics and Biomarker Discovery Step 1: Get Sequences into Skyline  Peptide shorthand makes it easy to insert modified sequences Make sure modifications are present in document!

Proteomics and Biomarker Discovery Entire assay document configured in one fell swoop

Proteomics and Biomarker Discovery Discovery and Targeted Platforms are Different XX  MaxQuant Used for all discovery data processing Performed all SILAC quantification MEGA result file –MS/MS table (txt) –2.8 GB  Skyline Targeted proteomics environment of choice Now supports MaxQuant / Andromeda formats

Proteomics and Biomarker Discovery Skyline Spectral Library Building

Proteomics and Biomarker Discovery Easily done even when data are distributed

Proteomics and Biomarker Discovery Instant Focused Spectral Library from > 2.8Gb Raw Spectra

Proteomics and Biomarker Discovery Peptide QC and RT Establishment  Run mixtures of peptides conforming to analysis clusters QExactive MS Inclusion lists pulled from Skyline doc Unscheduled…but fully targeted  Full-scan hi-res MS enables proof positive ID Allows comparison to library as a whole spectrum Mass accuracy increases confidence Can observe potential interferents when porting to triple quad

Proteomics and Biomarker Discovery Full-scan QC allows for proof-positive refinement

Proteomics and Biomarker Discovery Assay Optimization Strategy Revisited Identify and order peptides Configure Skyline document Sequence identities Spectra libraries Characterize peptides QC + establish RT properties Will later use iRT strategy for assay scheduling Refine spectral libraries  Configure final assay

Proteomics and Biomarker Discovery Distribution of the assay with Panorama  All of our work will be available to other labs To implement the assay at multiple sites  Ensure data analysis consistency  Clearing house of assay data  Communication with other project data infrastructures

Proteomics and Biomarker Discovery Conclusions  Skyline has contributed immensely to rapid configuration of our assay: Easy sequence import – even for modified peptides Easy spectral library creation based on discovery data Helpful in validation of synthetic peptides Sets groundwork for scheduling targeted assays Makes assay portable Panorama extension will make assay distributable  Feedback / support cycle of Skyline development can drive projects in real time

Proteomics and Biomarker Discovery Acknowledgements  LINCS Program and Program Officers U01 CA /Jaffe  MacCoss Lab, Univ. of Washington Mike MacCoss – co-PI Brendan MacLean Kaipo Tamura Vagisha Sharma  Broad Institute Proteomics Platform Jinal Patel Susan Abbatiello Lindsay Pino Philipp Mertins Steve Carr  Broad Institute LINCS Centers Todd Golub Aravind Subramanian Xiaodong Lu Roger Hu