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      Exploring the druggable space around the Fanconi anemia pathway using machine learning and mechanistic models

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          Abstract

          Background

          In spite of the abundance of genomic data, predictive models that describe phenotypes as a function of gene expression or mutations are difficult to obtain because they are affected by the curse of dimensionality, given the disbalance between samples and candidate genes. And this is especially dramatic in scenarios in which the availability of samples is difficult, such as the case of rare diseases.

          Results

          The application of multi-output regression machine learning methodologies to predict the potential effect of external proteins over the signaling circuits that trigger Fanconi anemia related cell functionalities, inferred with a mechanistic model, allowed us to detect over 20 potential therapeutic targets.

          Conclusions

          The use of artificial intelligence methods for the prediction of potentially causal relationships between proteins of interest and cell activities related with disease-related phenotypes opens promising avenues for the systematic search of new targets in rare diseases.

          Electronic supplementary material

          The online version of this article (10.1186/s12859-019-2969-0) contains supplementary material, which is available to authorized users.

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          Most cited references68

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          Gene selection and classification of microarray data using random forest

          Background Selection of relevant genes for sample classification is a common task in most gene expression studies, where researchers try to identify the smallest possible set of genes that can still achieve good predictive performance (for instance, for future use with diagnostic purposes in clinical practice). Many gene selection approaches use univariate (gene-by-gene) rankings of gene relevance and arbitrary thresholds to select the number of genes, can only be applied to two-class problems, and use gene selection ranking criteria unrelated to the classification algorithm. In contrast, random forest is a classification algorithm well suited for microarray data: it shows excellent performance even when most predictive variables are noise, can be used when the number of variables is much larger than the number of observations and in problems involving more than two classes, and returns measures of variable importance. Thus, it is important to understand the performance of random forest with microarray data and its possible use for gene selection. Results We investigate the use of random forest for classification of microarray data (including multi-class problems) and propose a new method of gene selection in classification problems based on random forest. Using simulated and nine microarray data sets we show that random forest has comparable performance to other classification methods, including DLDA, KNN, and SVM, and that the new gene selection procedure yields very small sets of genes (often smaller than alternative methods) while preserving predictive accuracy. Conclusion Because of its performance and features, random forest and gene selection using random forest should probably become part of the "standard tool-box" of methods for class prediction and gene selection with microarray data.
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            Single-Cell Genomics Unveils Critical Regulators of Th17 Cell Pathogenicity.

            Extensive cellular heterogeneity exists within specific immune-cell subtypes classified as a single lineage, but its molecular underpinnings are rarely characterized at a genomic scale. Here, we use single-cell RNA-seq to investigate the molecular mechanisms governing heterogeneity and pathogenicity of Th17 cells isolated from the central nervous system (CNS) and lymph nodes (LN) at the peak of autoimmune encephalomyelitis (EAE) or differentiated in vitro under either pathogenic or non-pathogenic polarization conditions. Computational analysis relates a spectrum of cellular states in vivo to in-vitro-differentiated Th17 cells and unveils genes governing pathogenicity and disease susceptibility. Using knockout mice, we validate four new genes: Gpr65, Plzp, Toso, and Cd5l (in a companion paper). Cellular heterogeneity thus informs Th17 function in autoimmunity and can identify targets for selective suppression of pathogenic Th17 cells while potentially sparing non-pathogenic tissue-protective ones.
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              Deep neural network improves fracture detection by clinicians

              Significance Historically, computer-assisted detection (CAD) in radiology has failed to achieve improvements in diagnostic accuracy, decreasing clinician sensitivity and leading to unnecessary further diagnostic tests. With the advent of deep learning approaches to CAD, there is great excitement about its application to medicine, yet there is little evidence demonstrating improved diagnostic accuracy in clinically-relevant applications. We trained a deep learning model to detect fractures on radiographs with a diagnostic accuracy similar to that of senior subspecialized orthopedic surgeons. We demonstrate that when emergency medicine clinicians are provided with the assistance of the trained model, their ability to accurately detect fractures significantly improves.
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                Author and article information

                Contributors
                marina.esteban@juntadeandalucia.es
                maria.pena.chilet.ext@juntadeandalucia.es
                carlos.loucera@juntadeandalucia.es
                joaquin.dopazo@juntadeandalucia.es
                Journal
                BMC Bioinformatics
                BMC Bioinformatics
                BMC Bioinformatics
                BioMed Central (London )
                1471-2105
                2 July 2019
                2 July 2019
                2019
                : 20
                : 370
                Affiliations
                [1 ]ISNI 0000 0000 9542 1158, GRID grid.411109.c, Clinical Bioinformatics Area. Fundación Progreso y Salud (FPS). CDCA, , Hospital Virgen del Rocio, ; 41013 Sevilla, Spain
                [2 ]ISNI 0000 0000 9542 1158, GRID grid.411109.c, Bioinformatics in Rare Diseases (BiER). Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), , FPS, Hospital Virgen del Rocío, ; 41013 Sevilla, Spain
                [3 ]ISNI 0000 0000 9542 1158, GRID grid.411109.c, INB-ELIXIR-es, FPS, Hospital Virgen del Rocío, ; 42013 Sevilla, Spain
                Author information
                http://orcid.org/0000-0003-3318-120X
                Article
                2969
                10.1186/s12859-019-2969-0
                6604281
                31266445
                193de2bb-f3a3-41d5-ac00-13a04b9e1b2c
                © The Author(s). 2019

                Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

                History
                : 6 May 2019
                : 25 June 2019
                Funding
                Funded by: MINECO
                Award ID: SAF2017-88908-R
                Funded by: ISCIII
                Award ID: PT17/0009/0006
                Funded by: H2020 Marie Curie Innovative Training Network
                Award ID: 813533
                Funded by: H2020
                Award ID: 676559
                Categories
                Research Article
                Custom metadata
                © The Author(s) 2019

                Bioinformatics & Computational biology
                genomics,big data,machine learning,fanconi anemia,signaling pathways,mathematical models

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