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Graphical modeling for gene set analysis: a critical appraisal. (English) Zbl 1334.62010

Summary: Current demand for understanding the behavior of groups of related genes, combined with the greater availability of data, has led to an increased focus on statistical methods in gene set analysis. In this paper, we aim to perform a critical appraisal of the methodology based on graphical models developed in [M. S. Massa, M. Chiogna and C. Romualdi, “Gene set analysis exploiting the topology of a pathway”, BMC Syst. Biol. 4, Paper No. 121 (2010; doi:10.1186/1752-0509-4-121)] that uses pathway signaling networks as a starting point to develop statistically sound procedures for gene set analysis. We pay attention to the potential of the methodology with respect to the organizational aspects of dealing with such complex but highly informative starting structures, that is pathways. We focus on three themes: the translation of a biological pathway into a graph suitable for modeling, the role of shrinkage when more genes than samples are obtained, the evaluation of respondence of the statistical models to the biological expectations. To study the impact of shrinkage, two simulation studies will be run. To evaluate the biological expectation we will use data from a network with known behavior that offer the possibility of carrying out a realistic check of respondence of the model to changes in the experimental conditions.

MSC:

62A09 Graphical methods in statistics
62-07 Data analysis (statistics) (MSC2010)
62P10 Applications of statistics to biology and medical sciences; meta analysis
92D10 Genetics and epigenetics
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