ProbMetab: an R package for Bayesian probabilistic annotation of LC-MS-based metabolomics

Ricardo R. Silva (1) , Fabien Jourdan (2) , Diego M. Salvanha (1, 3) , Fabien Letisse (4) , Emilien L. Jamin (5) , Simone Guidetti-Gonzalez (6) , Carlos A. Labate (7, 8) , Ricardo Z. N. Vencio (1)

1 FFCLRP-USP, Department of Computing and Mathematics, LabPIB
2 ToxAlim-MeX - Métabolisme et Xénobiotiques
3 Institute for Systems Biology
4 ToxAlim - ToxAlim
5 E20 - MetaToul AXIOM
6 ESALQ-USP, Department of Genetics
7 CTBE - Laboratório Nacional de Ciência e Tecnologia do Bioetanol
8 ESALQ USP, Department of Genetics

We present ProbMetab, an R package that promotes substantial improvement in automatic probabilistic liquid chromatography-mass spectrometry-based metabolome annotation. The inference engine core is based on a Bayesian model implemented to (i) allow diverse source of experimental data and metadata to be systematically incorporated into the model with alternative ways to calculate the likelihood function and (ii) allow sensitive selection of biologically meaningful biochemical reaction databases as Dirichletcategorical prior distribution. Additionally, to ensure result interpretation by system biologists, we display the annotation in a network where observed mass peaks are connected if their candidate metabolites are substrate/ product of known biochemical reactions. This graph can be overlaid with other graph-based analysis, such as partial correlation networks, in a visualization scheme exported to Cytoscape, with web and stand-alone versions.

Domaines: Sciences du Vivant [q-bio]

Ricardo R. Silva, Fabien Jourdan, Diego M. Salvanha, Fabien Letisse, Emilien L. Jamin, et al.. ProbMetab: an R package for Bayesian probabilistic annotation of LC-MS-based metabolomics. Bioinformatics, 2014, 30 (9), pp.1336 - 1337. ⟨10.1093/bioinformatics/btu019⟩. ⟨hal-01268715⟩