Nonparametric Bayesian evaluation of differential protein quantification.

Nonparametric Bayesian evaluation of differential protein quantification.
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DOI:
10.1021/pr400678m
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发表时间:
2013-10-04
影响因子:
4.4
通讯作者:
Steen JA
Steen JA
中科院分区:
生物学2区
文献类型:
--
作者:
Serang O;Cansizoglu AE;Käll L;Steen H;Steen JA

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Arbitrary cutoffs are ubiquitous in quantitative computational proteomics: maximum acceptable MS/MS PSM or peptide q–value, minimum ion intensity to calculate a fold change, the minimum number of peptides that must be available to trust the estimated protein fold change (or the minimum number of PSMs that must be available to trust the estimated peptide fold change), and the “significant” fold change cutoff. Here we introduce a novel experimental setup and nonparametric Bayesian algorithm for determining the statistical quality of a proposed differential set of proteins or peptides. By comparing putatively non-changing case-control evidence to an empirical null distribution derived from a control-control experiment, we successfully avoid some of these common parameters. We then apply our method to evaluating different fold change rules and find that, for our data, a 1.2-fold change is the most permissive of the plausible fold change rules.
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