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Remarkable temporal stability of high‐abundance human plasma proteins assessed by targeted mass spectrometry
Author(s) -
Randall Sarah A.,
McKay Matthew J.,
Pascovici Dana,
Mahon Kate,
Horvath Lisa,
Clarke Stephen J.,
Molloy Mark P.
Publication year - 2012
Publication title -
proteomics – clinical applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.948
H-Index - 54
eISSN - 1862-8354
pISSN - 1862-8346
DOI - 10.1002/prca.201200039
Subject(s) - mass spectrometry , abundance (ecology) , chemistry , human plasma , chromatography , computational biology , biology , ecology
Purpose To examine temporal fluctuations in selected plasma protein levels over a period of nearly 4 months and assess biological variation of these proteins across a healthy population cohort. Experimental design Plasma was collected from ten healthy volunteers over two time‐courses: (i) weekly for 4 weeks; (ii) bimonthly over 4 months and depleted of albumin and I g G . SRM MS was used to determine the relative quantitation of 31 plasma proteins commonly observed in biomarker studies over these time courses. Estimates of between‐subject and within‐subject biological variances determined by SRM were calculated for each protein. Results Replicate analysis demonstrated the high precision of SRM assays of plasma proteins. Statistical analysis indicated that none of the measured proteins exhibited significant temporal fluctuations over either time course. Overall, time‐based intraindividual quantitative variation of plasma protein levels was considerably lower than biological variation occurring between individual volunteers. Conclusions and clinical relevance This study is the first to show robust temporal stability of the plasma proteome in healthy individuals using SRM ‐based peptide quantitation. This is important as it provides a strong basis for reliable detection of disease/treatment‐related changes of these plasma proteins and others using SRM .