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Quantitative Analysis of the Intra- and Inter-Individual Variability of the Normal Urinary Proteome

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Nagaraj, Nagarjuna, Mann, Matthias·2011·Journal of Proteome Research

Abstract

Urine is a readily and noninvasively obtainable body fluid. Mass spectrometry (MS)-based proteomics has shown that urine contains thousands of proteins. Urine is a potential source of biomarkers for diseases of proximal and distal tissues but it is thought to be more variable than the more commonly used plasma. By LC-MS/MS analysis on an LTQ-Orbitrap without prefractionation we characterized the urinary proteome of seven normal human donors over three consecutive days. Label-free quantification of triplicate single runs covered the urinary proteome to a depth of more than 600 proteins. The median coefficient of variation (cv) of technical replicates was 0.18. Interday variability was markedly higher with a cv of 0.48 and the overall variation of the urinary proteome between individuals was 0.66. Thus technical variability in our data was 7.5%, whereas intrapersonal variability contributed 45.5% and interpersonal variability contributed 47.1% to total variability. Determination of the normal fluctuation of individual urinary proteins should be useful in establishing significance thresholds in biomarker studies. Our data also allowed definition of a common and abundant set of 500 proteins that were readily detectable in all studied individuals. This core urinary proteome has a high proportion of secreted, membrane, and relatively high-molecular weight proteins.

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Metadata

Authors
Nagaraj, N., & Mann, M.
Venue
Journal of Proteome Research
Published
2011-01-05
Volume
10
Issue
2
Pages
637-645
ISSN
  • 1535-3893 (ISSN-L)
  • 1535-3907
OpenAlex
W2062311239
Cited by
252
References
8
FWCI
6.77
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Quantitative Analysis of the Intra- and Inter-Individual Variability of the Normal Urinary Proteome. https://app.cochat.ai/papers/10.1021/pr100835s
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Nagaraj, N., & Mann, M. (2011). Quantitative Analysis of the Intra- and Inter-Individual Variability of the Normal Urinary Proteome. Journal of Proteome Research. https://doi.org/10.1021/pr100835s

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