Research

Pooling serum samples may lead to loss of potential biomarkers in SELDI-ToF MS proteomic profiling

S Tariq Sadiq¹ and Dan Agranoff²

¹  Centre for Infection, Cellular & Molecular Medicine, St George's University of London, Cranmer Terrace, SW17, London, UK

²  Department of Infectious Diseases and Immunity, Imperial College London (Hammersmith campus), Commonwealth Bldg, Du Cane Rd, W12 ONN, London, UK

author email corresponding author email

Proteome Science 2008, 6:16doi:10.1186/1477-5956-6-16

Published:	1 June 2008

Abstract

Background

High throughput proteomic technology offers promise for the detection of disease biomarkers and proteomic signature patterns but biomarker discovery studies can be limited by cost factors when large sample size numbers are required. Pooling sera or plasma samples from disease cases potentially offers a solution to cost implications by reducing the standard errors of mass to charge values. Surface enhanced laser desorption/ionization time of flight (SELDI-ToF) mass spectra obtained from individual and pooled sera from invasive aspergillosis cases and controls were compared.

Results

Pooling resulted in 50% loss of peak clusters detected in individual samples. Overall, loss was greatest for low intensity clusters. Peak intensities and case:control intensity ratios, among clusters not lost, demonstrated good reproducibility.

Conclusion

Pooling sera results in significant potential biomarker loss when using SELDI-ToF MS.