Modeling of cytometry data in logarithmic space: When is a bimodal distribution not bimodal?

Modeling of cytometry data in logarithmic space: When is a bimodal distribution not bimodal?
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DOI:
10.1002/cyto.a.23333
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发表时间:
2018-06
期刊:
Cytometry. Part A : the journal of the International Society for Analytical Cytology
影响因子:
--
通讯作者:
Altan-Bonnet G
Altan-Bonnet G
中科院分区:
其他
文献类型:
--
作者:
Erez A;Vogel R;Mugler A;Belmonte A;Altan-Bonnet G

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Recent efforts in systems immunology lead researchers to build quantitative models of cell activation and differentiation. One goal is to account for the distributions of proteins from single-cell measurements by flow cytometry or mass cytometry as readout of biological regulation. In that context, large cell-to-cell variability is often observed in biological quantities. We show here that these readouts, viewed in logarithmic scale may result in two easily-distinguishable modes, while the underlying distribution (in linear scale) is unimodal. We introduce a simple mathematical test to highlight this mismatch. We then dissect the flow of influence of cell-to-cell variability proposing a graphical model which motivates higher-dimensional analysis of the data. Finally we show how acquiring additional biological information can be used to reduce uncertainty introduced by cell-to-cell variability, helping to clarify whether the data is uni- or bimodal. This communication has cautionary implications for manual and automatic gating strategies, as well as clustering and modeling of single-cell measurements.
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