title: Towards reproducible MRM based biomarker discovery using dried blood spots.
abstract: There is an increasing interest in the use of dried blood spot (DBS) sampling and multiple reaction monitoring in proteomics. Although several groups have explored the utility of DBS by focusing on protein detection, the reproducibility of the approach and whether it can be used for biomarker discovery in high throughput studies is yet to be determined. We assessed the reproducibility of multiplexed targeted protein measurements in DBS compared to serum. Eighty-two medium to high abundance proteins were monitored in a number of technical and biological replicates. Importantly, as part of the data analysis, several statistical quality control approaches were evaluated to detect inaccurate transitions. After implementing statistical quality control measures, the median CV on the original scale for all detected peptides in DBS was 13.2% and in Serum 8.8%. We also found a strong correlation (r = 0.72) between relative peptide abundance measured in DBS and serum. The combination of minimally invasive sample collection with a highly specific and sensitive mass spectrometry (MS) technique allows for targeted quantification of multiple proteins in a single MS run. This approach has the potential to fundamentally change clinical proteomics and personalized medicine by facilitating large-scale studies.
authors.affiliation: Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom.
authors.forename: Sureyya
authors.initials: S
authors.lastname: Ozcan
authors.affiliation: Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom.
authors.forename: Jason D
authors.initials: JD
authors.lastname: Cooper
authors.affiliation: Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom.
authors.forename: Santiago G
authors.initials: SG
authors.lastname: Lago
authors.affiliation: Department of Chemical Engineering and Biotechnology, Psynova Neurotech Ltd, Cambridge, United Kingdom.
authors.forename: Diarmuid
authors.initials: D
authors.lastname: Kenny
authors.affiliation: Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom.
authors.forename: Nitin
authors.initials: N
authors.lastname: Rustogi
authors.affiliation: Department of Chemical Engineering and Biotechnology, Psynova Neurotech Ltd, Cambridge, United Kingdom.
authors.forename: Pawel
authors.initials: P
authors.lastname: Stocki
authors.affiliation: Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom.
authors.forename: Sabine
authors.initials: S
authors.lastname: Bahn
mesh_terms: D015415:Biomarkers / Q000032:analysis / Q000097:blood*; D002853:Chromatography, Liquid; D059788:Dried Blood Spot Testing / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D010455:Peptides / Q000032:analysis / Q000097:blood*; D057285:Precision Medicine; D040901:Proteomics / Q000379:methods*; D015203:Reproducibility of Results; D053719:Tandem Mass Spectrometry
chemical_list: D015415:Biomarkers; D010455:Peptides