Reducing Peptide Sequence Bias in Quantitative Mass Spectrometry Data with Machine Learning.

Reducing Peptide Sequence Bias in Quantitative Mass Spectrometry Data with Machine Learning.
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用机器学习减少定量质谱数据中的肽序列偏差。

DOI:
10.1021/acs.jproteome.2c00211
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发表时间:
2022-07-01
影响因子:
4.4
通讯作者:
Noble, William Stafford
Noble, William Stafford
中科院分区:
生物学2区
文献类型:
--
作者:
Dincer, Ayse B.;Lu, Yang;Schweppe, Devin K.;Oh, Sewoong;Noble, William Stafford

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多肽的定量质谱学测量必须包含反映多肽在酶消化、液相色谱和质谱仪中行为的特定序列偏差。这些特定于序列的效应损害了量化的准确性,产生的多肽数量被系统性地低估或高估。我们为这种偏见的存在提供了经验证据,我们使用一个名为Pepper的深度神经网络来自动识别和减少这些偏见。该模型推广到一组相关的MS/MS实验中的新蛋白质和新的运行,学习的系数本身反映了相应肽序列的预期物理化学性质。与未调整的测量结果相比,调整后的丰度测量结果与基于mRNA的基因表达测量结果更相关。Pepper适用于在各种质谱仪上产生的数据,可用于标记或非标记方法,以及独立于数据或依赖于数据的获取。
Quantitative mass spectrometry measurements of peptides necessarily incorporate sequence-specific biases that reflect the behavior of the peptide during enzymatic digestion, liquid chromatography, and in the mass spectrometer. These sequence-specific effects impair quantification accuracy, yielding peptide quantities that are systematically under- or over-estimated. We provide empirical evidence for the existence of such biases, and we use a deep neural network, called Pepper, to automatically identify and reduce these biases. The model generalizes to new proteins and new runs within a related set of MS/MS experiments, and the learned coefficients themselves reflect expected physicochemical properties of the corresponding peptide sequences. The resulting adjusted abundance measurements are more correlated with mRNA-based gene expression measurements than the unadjusted measurements. Pepper is suitable for data generated on a variety of mass spectrometry instruments, and can be used with labeled or label-free approaches, and with data-independent or data-dependent acquisition.
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