Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 55
Filtrar
Mais filtros

Base de dados
País/Região como assunto
Tipo de documento
Intervalo de ano de publicação
1.
BMC Bioinformatics ; 18(Suppl 5): 101, 2017 Mar 23.
Artigo em Inglês | MEDLINE | ID: mdl-28361713

RESUMO

The 15th International NETTAB workshop and the 11th Integrative Bioinformatics Symposium were held together in Bari, on October 14-16, 2016, as Joint NETTAB/IB 2015 Meeting. A special topic for the meeting was "Bioinformatics for ncRNA", but the traditional topics of both meetings series were also included in the event.About 60 scientific contributions were presented, including six keynote lectures, one special guest lecture, and many oral communications and posters. A "Two-Day Hands-on Tutorial" event was organised before the workshop.Selected full papers from some of the best works presented in Bari were submitted either to the Journal of Integrative Bioinformatics or to a purpose Call for a Supplement of BMC Bioinformatics.Here, we provide an overview of meeting aims and scope. We also shortly introduce selected papers that have been either accepted for publication in this Supplement or published in the Journal of Integrative Bioinformatics, for a more complete presentation of the outcomes of the meeting.


Assuntos
Biologia Computacional/métodos , RNA não Traduzido , Animais , Humanos
2.
BMC Med Inform Decis Mak ; 15: 15, 2015 Feb 28.
Artigo em Inglês | MEDLINE | ID: mdl-25881043

RESUMO

BACKGROUND: Adverse drug reactions are one of the most common causes of death in industrialized Western countries. Nowadays, empirical data from clinical studies for the approval and monitoring of drugs and molecular databases is available. METHODS: The integration of database information is a promising method for providing well-based knowledge to avoid adverse drug reactions. This paper presents our web-based decision support system GraphSAW which analyzes and evaluates drug interactions and side effects based on data from two commercial and two freely available molecular databases. The system is able to analyze single and combined drug-drug interactions, drug-molecule interactions as well as single and cumulative side effects. In addition, it allows exploring associative networks of drugs, molecules, metabolic pathways, and diseases in an intuitive way. The molecular medication analysis includes the capabilities of the upper features. RESULTS: A statistical evaluation of the integrated data and top 20 drugs concerning drug interactions and side effects is performed. The results of the data analysis give an overview of all theoretically possible drug interactions and side effects. The evaluation shows a mismatch between pharmaceutical and molecular databases. The concordance of drug interactions was about 12% and 9% of drug side effects. An application case with prescribed data of 11 patients is presented in order to demonstrate the functionality of the system under real conditions. For each patient at least two interactions occured in every medication and about 8% of total diseases were possibly induced by drug therapy. CONCLUSIONS: GraphSAW (http://tunicata.techfak.uni-bielefeld.de/graphsaw/) is meant to be a web-based system for health professionals and researchers. GraphSAW provides comprehensive drug-related knowledge and an improved medication analysis which may support efforts to reduce the risk of medication errors and numerous drastic side effects.


Assuntos
Gráficos por Computador , Interpretação Estatística de Dados , Bases de Dados Factuais , Sistemas de Apoio a Decisões Clínicas , Interações Medicamentosas , Efeitos Colaterais e Reações Adversas Relacionados a Medicamentos , Humanos , Internet
3.
BMC Genomics ; 15 Suppl 12: S7, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25564293

RESUMO

BACKGROUND: Biological processes are usually distributed over various intracellular compartments. Proteins from diverse cellular compartments are often involved in similar signaling networks. However, the difference in the reaction rates between similar proteins among different compartments is usually quite high. We suggest that the estimation of frequency of intracompartmental as well as intercompartmental protein-protein interactions is an appropriate approach to predict the efficiency of a pathway. RESULTS: Using data from the databases STRING, ANDSystem, IntAct and UniProt, a PPI frequency matrix of intra/inter-compartmental interactions efficiencies was constructed. This matrix included 15 human-specific cellular compartments. An approach for estimating pathway efficiency using the matrix of intra/inter-compartmental PPI frequency, based on analysis of reactions efficiencies distribution was suggested. An investigation of KEGG pathway efficiencies was conducted using the developed method. The clusterization and the ranking of KEGG pathways based on their efficiency were performed. "Amino acid metabolism" and "Genetic information processing" revealed the highest efficiencies among other functional classes of KEGG pathways. "Nervous system" and "Signaling molecules interaction" contained the most inefficient pathways. Statistically significant differences were found between efficiencies of KEGG and randomly-generated pathways. Based on these observations, the validity of this approach was discussed. CONCLUSION: The estimation of efficiency of signaling networks is a complicated task because of the need for the data on the kinetic reactions. However, the proposed method does not require such data and can be used for preliminary analysis of different protein networks.


Assuntos
Mapeamento de Interação de Proteínas/métodos , Transdução de Sinais , Humanos
4.
5.
Bioinformatics ; 27(23): 3321-2, 2011 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-21984760

RESUMO

SUMMARY: MyBioNet is a web-based application for biological network analysis, which provides user-friendly web interfaces to visualize, edit and merge biological networks. In addition, MyBioNet integrated KEGG metabolic network data from 1366 organisms and allows users to search and navigate interesting networks. AVAILABILITY AND IMPLEMENTATION: All KEGG metabolic network data are organized and stored in the MySQL database. MyBioNet is implemented in Flex/Actionscript and PHP languages and deployed on an Apache web server. MyBioNet is accessible through all the Flash-embedded browsers at http://bis.zju.edu.cn/mybionet/. CONTACT: mchen@zju.edu.cn.


Assuntos
Redes e Vias Metabólicas , Software , Algoritmos , Biologia Computacional , Bases de Dados Factuais , Humanos , Internet , Oryza/metabolismo , Interface Usuário-Computador
7.
Stud Health Technol Inform ; 162: 38-55, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21685563

RESUMO

A method to exploit hybrid Petri nets (HPN) for quantitatively modeling and simulating gene regulated metabolic networks is demonstrated. A global kinetic modeling strategy and Petri net modeling algorithm are applied to perform the bioprocess functioning and model analysis. With the model, the interrelations between pathway analysis and metabolic control mechanism are outlined. Diagrammatical results of the dynamics of metabolites are simulated and observed by implementing a HPN tool, Visual Object Net ++. An explanation of the observed behavior of the urea cycle is proposed to indicate possibilities for metabolic engineering and medical care. Finally, the perspective of Petri nets on modeling and simulation of metabolic networks is discussed.


Assuntos
Simulação por Computador , Modelos Biológicos , Algoritmos , Humanos , Redes e Vias Metabólicas , Transdução de Sinais
8.
Stud Health Technol Inform ; 162: 182-203, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21685572

RESUMO

The understanding of the molecular mechanism of cell-to-cell communication is fundamental for system biology. Up to now, the main objectives of bioinformatics have been reconstruction, modeling and analysis of metabolic, regulatory and signaling processes, based on data generated from high-throughput technologies. Cell-to-cell communication or quorum sensing (QS), the use of small molecule signals to coordinate complex patterns of behavior in bacteria, has been the focus of many reports over the past decade. Based on the quorum sensing process of the organism Aliivibrio salmonicida, we aim at developing a functional Petri net, which will allow modeling and simulating cell-to-cell communication processes. Using a new editor-controlled information system called VANESA (http://vanesa.sf.net), we present how to combine different fields of studies such as life-science, database consulting, modeling, visualization and simulation for a semi-automatic reconstruction of the complex signaling quorum sensing network. We show how cell-to-cell communication processes and information-flow within a cell and across cell colonies can be modeled using VANESA and how those models can be simulated with Petri net network structures in a sophisticated way.


Assuntos
Modelos Biológicos , Percepção de Quorum , Comunicação Celular , Biologia Computacional , Simulação por Computador , Transdução de Sinais
9.
Biosystems ; 210: 104531, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34492317

RESUMO

Petri nets are a common method for modeling and simulation of systems biology application cases. Usually different Petri net concepts (e.g. discrete, hybrid, functional) are demanded depending on the purpose of the application cases. Modeling complex application cases requires a unification of those concepts, e.g. hybrid functional Petri nets (HFPN) and extended hybrid Petri nets (xHPN). Existing tools have certain limitations which motivated the extension of VANESA, an existing open-source editor for biological networks. The extension can be used to model, simulate, and visualize Petri nets based on the xHPN formalism. Moreover, it comprises additional functionality to support and help the user. Complex (kinetic) functions are syntactically analyzed and mathematically rendered. Based on syntax and given physical unit information, modeling errors are revealed. The numerical simulation is seamlessly integrated and executed in the background by the open-source simulation environment OpenModelica utilizing the Modelica library PNlib. Visualization of simulation results for places, transitions, and arcs are useful to investigate and understand the model and its dynamic behavior. The impact of single parameters can be revealed by comparing multiple simulation results. Simulation results, charts, and entire specification of the Petri net model as Latex file can be exported. All these features are shown in the demonstration case. The utilized Petri net formalism xHPN is fully specified and implemented in PNlib. This assures transparency, reliability, and comprehensible simulation results. Thus, the combination of VANESA and OpenModelica shape a unique open-source Petri net environment focusing on systems biology application cases. VANESA is available at: http://agbi.techfak.uni-bielefeld.de/vanesa.


Assuntos
Simulação por Computador , Modelos Biológicos , Nomogramas , Software , Biologia de Sistemas/métodos , Animais , Simulação por Computador/tendências , Humanos , Redes e Vias Metabólicas/fisiologia , Software/tendências , Biologia de Sistemas/tendências
10.
J Integr Bioinform ; 18(1): 9-17, 2021 Mar 19.
Artigo em Inglês | MEDLINE | ID: mdl-33735949

RESUMO

Outbreaks of COVID-19 caused by the novel coronavirus SARS-CoV-2 is still a threat to global human health. In order to understand the biology of SARS-CoV-2 and developing drug against COVID-19, a vast amount of genomic, proteomic, interatomic, and clinical data is being generated, and the bioinformatics researchers produced databases, webservers and tools to gather those publicly available data and provide an opportunity of analyzing such data. However, these bioinformatics resources are scattered and researchers need to find them from different resources discretely. To facilitate researchers in finding the resources in one frame, we have developed an integrated web portal called OverCOVID (http://bis.zju.edu.cn/overcovid/). The publicly available webservers, databases and tools associated with SARS-CoV-2 have been incorporated in the resource page. In addition, a network view of the resources is provided to display the scope of the research. Other information like SARS-CoV-2 strains is visualized and various layers of interaction resources is listed in distinct pages of the web portal. As an integrative web portal, the OverCOVID will help the scientist to search the resources and accelerate the clinical research of SARS-CoV-2.


Assuntos
COVID-19 , Biologia Computacional/métodos , Bases de Dados Factuais , Internet , Humanos , Proteômica , SARS-CoV-2
11.
Hum Mutat ; 31(1): E1081-8, 2010 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-19953641

RESUMO

RAMEDIS is a manually curated resource of human variations and corresponding phenotypes for rare metabolic diseases. The system is based on separate case reports that comprehensively describe various aspects of anonymous case study, e.g. molecular genetics, symptoms, lab findings, treatments, etc. Scientists are able to make use of the database by a simple and intuitive web-based user interface with a common web browser. A registration or login is not necessary for a full reading access to the system content. Furthermore, a mutation analysis table summarizes the submitted variations per diagnosis and enables direct access to detailed information of corresponding case reports. Interested scientists may open an account to submit their case reports in order to share valuable genotype-phenotype information efficiently with the scientific community. Currently, 794 case reports have been submitted, describing 92 different genetic metabolic diseases. To enhance the comprehensive coverage of available knowledge in the field of rare metabolic diseases, all case reports are linked to integrated information from public molecular biology databases like KEGG, OMIM and ENZYME. This information upgrades the case reports by related data of the corresponding diseases as well as involved enzymes, genes and metabolic pathways. Academic users may freely use the RAMEDIS system at http://www.ramedis.de.


Assuntos
Bases de Dados Genéticas , Doenças Genéticas Inatas , Doenças Metabólicas , Doenças Raras , Adolescente , Adulto , Criança , Pré-Escolar , Biologia Computacional , Sistemas de Gerenciamento de Base de Dados , Doenças Genéticas Inatas/genética , Doenças Genéticas Inatas/fisiopatologia , Variação Genética , Genótipo , Humanos , Internet , Doenças Metabólicas/genética , Doenças Metabólicas/fisiopatologia , Mutação , Fenótipo , Doenças Raras/genética , Doenças Raras/fisiopatologia
12.
In Silico Biol ; 10(1): 27-48, 2010.
Artigo em Inglês | MEDLINE | ID: mdl-22430220

RESUMO

The understanding of the molecular mechanism of cell-to-cell communication is fundamental for system biology. Up to now, the main objectives of bioinformatics have been reconstruction, modeling and analysis of metabolic, regulatory and signaling processes, based on data generated from high-throughput technologies. Cell-to-cell communication or quorum sensing (QS), the use of small molecule signals to coordinate complex patterns of behavior in bacteria, has been the focus of many reports over the past decade. Based on the quorum sensing process of the organism Aliivibrio salmonicida, we aim at developing a functional Petri net, which will allow modeling and simulating cell-to-cell communication processes. Using a new editor-controlled information system called VANESA (http://vanesa.sf.net), we present how to combine different fields of studies such as life-science, database consulting, modeling, visualization and simulation for a semi-automatic reconstruction of the complex signaling quorum sensing network. We show how cell-to-cell communication processes and information-flow within a cell and across cell colonies can be modeled using VANESA and how those models can be simulated with Petri net network structures in a sophisticated way.


Assuntos
Simulação por Computador , Modelos Biológicos , Percepção de Quorum , Software , Algoritmos , Aliivibrio salmonicida/fisiologia , Comunicação Celular , Retroalimentação Fisiológica , Regulação Bacteriana da Expressão Gênica , Redes Reguladoras de Genes , Genes Bacterianos , Transdução de Sinais
13.
J Integr Bioinform ; 16(4)2020 Jan 08.
Artigo em Inglês | MEDLINE | ID: mdl-31913853

RESUMO

JIB.tools 2.0 is a new approach to more closely embed the curation process in the publication process. This website hosts the tools, software applications, databases and workflow systems published in the Journal of Integrative Bioinformatics (JIB). As soon as a new tool-related publication is published in JIB, the tool is posted to JIB.tools and can afterwards be easily transferred to bio.tools, a large information repository of software tools, databases and services for bioinformatics and the life sciences. In this way, an easily-accessible list of tools is provided which were published in JIB a well as status information regarding the underlying service. With newer registries like bio.tools providing these information on a bigger scale, JIB.tools 2.0 closes the gap between journal publications and registry publication. (Reference: https://jib.tools).


Assuntos
Biologia Computacional , Publicações Periódicas como Assunto , Sistema de Registros , Software , Bases de Dados Factuais , Internet
14.
IEEE/ACM Trans Comput Biol Bioinform ; 16(5): 1471-1482, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30736003

RESUMO

The understanding of subcellular localization (SCL) of proteins and proteome variation in the different tissues and organs of the human body are two crucial aspects for increasing our knowledge of the dynamic rules of proteins, the cell biology, and the mechanism of diseases. Although there have been tremendous contributions to these two fields independently, the lack of knowledge of the variation of spatial distribution of proteins in the different tissues still exists. Here, we proposed an approach that allows predicting protein SCL on tissue specificity through the use of tissue-specific functional associations and physical protein-protein interactions (PPIs). We applied our previously developed Bayesian collective Markov random fields (BCMRFs) on tissue-specific protein-protein interaction network (PPI network) for nine types of tissues focusing on eight high-level SCL. The evaluated results demonstrate the strength of our approach in predicting tissue-specific SCL. We identified 1,314 proteins that their SCL were previously proven cell line dependent. We predicted 549 novel tissue-specific localized candidate proteins while some of them were validated via text-mining.


Assuntos
Biologia Computacional/métodos , Espaço Intracelular/metabolismo , Especificidade de Órgãos/genética , Algoritmos , Teorema de Bayes , Humanos , Espaço Intracelular/química , Espaço Intracelular/genética , Cadeias de Markov , Mapeamento de Interação de Proteínas/métodos , Mapas de Interação de Proteínas/genética , Proteoma/química , Proteoma/genética , Proteoma/metabolismo , Reprodutibilidade dos Testes
15.
Sci Rep ; 9(1): 16302, 2019 11 08.
Artigo em Inglês | MEDLINE | ID: mdl-31705029

RESUMO

Asthma and hypertension are complex diseases coinciding more frequently than expected by chance. Unraveling the mechanisms of comorbidity of asthma and hypertension is necessary for choosing the most appropriate treatment plan for patients with this comorbidity. Since both diseases have a strong genetic component in this article we aimed to find and study genes simultaneously associated with asthma and hypertension. We identified 330 shared genes and found that they form six modules on the interaction network. A strong overlap between genes associated with asthma and hypertension was found on the level of eQTL regulated genes and between targets of drugs relevant for asthma and hypertension. This suggests that the phenomenon of comorbidity of asthma and hypertension may be explained by altered genetic regulation or result from drug side effects. In this work we also demonstrate that not only drug indications but also contraindications provide an important source of molecular evidence helpful to uncover disease mechanisms. These findings give a clue to the possible mechanisms of comorbidity and highlight the direction for future research.


Assuntos
Asma/epidemiologia , Asma/etiologia , Efeitos Colaterais e Reações Adversas Relacionados a Medicamentos/complicações , Predisposição Genética para Doença , Hipertensão/epidemiologia , Hipertensão/etiologia , Comorbidade , Biologia Computacional/métodos , Bases de Dados Genéticas , Suscetibilidade a Doenças , Perfilação da Expressão Gênica , Regulação da Expressão Gênica , Redes Reguladoras de Genes , Humanos
16.
Stud Health Technol Inform ; 253: 183-187, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30147069

RESUMO

MicroRNAs (miRNAs), approximately 22 nucleotides long, post-transcriptionally active gene expression regulators, play active roles in modulating cellular processes. Gene regulation and miRNA regulation are intertwined and the main aim of this study is to facilitate the analysis of miRNAs within gene regulatory pathways. VANESA enables the reconstruction of biological pathways and supports visualization and simulation. To support integrative miRNA and gene pathway analyses, a custom database of experimentally proven miRNAs, integrating data from miRBase, TarBase and miRTarBase, was added to DAWIS-M.D., which is the main data source for VANESA. Analysis of human KEGG pathways within DAWIS-M.D. showed that 661 miRNAs (~1/3 recorded human miRNAs) lead to 65,474 interactions. hsa-miR-335-5p targets most genes in our system (2,544); while the most targeted gene (with 71 miRNAs) is NUFIP2 (Nuclear Fragile X Mental Retardation Protein Interacting Protein 2). Amyotrophic Lateral Sclerosis (ALS), a complex neurodegenerative disease, was chosen as a proof of concept model. Using our system, it was possible to reduce the initially several hundred genes and miRNAs associated with ALS to eight genes, 19 miRNAs and 31 interactions. This highlights the effectiveness of the implemented system to distill important information from otherwise hard to access, highly convoluted and vast regulatory networks.


Assuntos
Esclerose Lateral Amiotrófica/genética , Bases de Dados Genéticas , Regulação da Expressão Gênica , Redes Reguladoras de Genes , MicroRNAs , Perfilação da Expressão Gênica , Humanos , Estatística como Assunto
18.
J Integr Bioinform ; 15(4)2018 Dec 25.
Artigo em Inglês | MEDLINE | ID: mdl-30864352

RESUMO

The prevalence of comorbid diseases poses a major health issue for millions of people worldwide and an enormous socio-economic burden for society. The molecular mechanisms for the development of comorbidities need to be investigated. For this purpose, a workflow system was developed to aggregate data on biomedical entities from heterogeneous data sources. The process of integrating and merging all data sources of the workflow system was implemented as a semi-automatic pipeline that provides the import, fusion, and analysis of the highly connected biomedical data in a Neo4j database GenCoNet. As a starting point, data on the common comorbid diseases essential hypertension and bronchial asthma was integrated. GenCoNet (https://genconet.kalis-amts.de) is a curated database that provides a better understanding of hereditary bases of comorbidities.


Assuntos
Asma/patologia , Biologia Computacional/métodos , Gráficos por Computador , Bases de Dados Factuais , Hipertensão Essencial/patologia , Redes Reguladoras de Genes , Software , Asma/epidemiologia , Asma/genética , Comorbidade , Hipertensão Essencial/epidemiologia , Hipertensão Essencial/genética , Humanos , Fluxo de Trabalho
19.
J Integr Bioinform ; 15(2)2018 Jul 11.
Artigo em Inglês | MEDLINE | ID: mdl-30001212

RESUMO

The structural modeling and representation of cells is a complex task as different microscopic, spectroscopic and other information resources have to be combined to achieve a three-dimensional representation with high accuracy. Moreover, to provide an appropriate spatial representation of the cell, a stereoscopic 3D (S3D) visualization is favorable. In this work, a structural cell model is created by combining information from various light microscopic and electron microscopic images as well as from publication-related data. At the mesoscopic level each cell component is presented with special structural and visual properties; at the molecular level a cell membrane composition and the underlying modeling method are discussed; and structural information is correlated with those at the functional level (represented by simplified energy-producing metabolic pathways). The organism used as an example is the unicellular Chlamydomonas reinhardtii, which might be important in future alternative energy production processes. Based on the 3D model, an educative S3D animation was created which was shown at conferences. The complete workflow was accomplished by using the open source 3D modeling software Blender. The discussed project including the animation is available from: http://Cm5.CELLmicrocosmos.org.


Assuntos
Membrana Celular/química , Chlamydomonas reinhardtii/química , Heurística , Imageamento Tridimensional/métodos , Software , Fenômenos Fisiológicos Celulares , Chlamydomonas reinhardtii/citologia
20.
J Integr Bioinform ; 15(4)2018 Dec 10.
Artigo em Inglês | MEDLINE | ID: mdl-30530891

RESUMO

One of the most common comorbid pathology is asthma and arterial hypertension. For experimental modeling of comorbidity we have used spontaneously hypertensive rats with ovalbumin (OVA)-induced asthma. Rats were randomly divided into three groups: control group, OVA-induced asthma group; OVA-induced asthma + IL10 shRNA interference group. Target gene (IL10) was predicted by ANDSystem. We have demonstrated that RNA-interference of IL10 affected cardiovascular (tested using Millar microcatheter system) as well as respiratory functions (tested using force-oscillation technique, Flexivent) in rats. We have shown that during RNA-interference of IL10 gene in vivo there were changes in both cardiac and lung function parameters. These changes in the cardiovascular parameters can be described as positive. But the more intensive heart workload can lead to exhaust and decompensation of the heart functions. Knockdown of IL10 gene in asthma modeling induces some positive changes in respiratory functions of asthmatic animals such as decreased elastance and increased compliance of the lungs, as well as less pronounced pathomorphological changes in the lung tissue. Thus, we provide the data about experimentally confirmed functionality changes of the target which was in silico predicted to be associated with both asthma and hypertension - in our new experimental model of comorbid pathology.


Assuntos
Asma/patologia , Biologia Computacional/métodos , Hipertensão/patologia , Interleucina-10/antagonistas & inibidores , RNA Interferente Pequeno/genética , Animais , Asma/induzido quimicamente , Asma/metabolismo , Comorbidade , Hipertensão/induzido quimicamente , Hipertensão/metabolismo , Interleucina-10/genética , Interleucina-10/metabolismo , Masculino , Ovalbumina/toxicidade , Ratos , Ratos Endogâmicos SHR
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA