Dataset Information

Leloup2003_CircClock_DD_REV-ERBalpha

ABSTRACT: This is model in continous darkness (DD) described in the article Toward a detailed computational model for the mammalian circadian clock This model features the full interlocked negative and positive regulation of Per,Cry,Bmal and REV-ERBalpha. The model exhibits robust oscillations quite independent of the initial conditions for teh parameters given. Each species is assigned zero as initial value, and the graph started at time=120h. Simulation results could be reproduced using Copasi 4.0.19(development) and roadRunner online. This model originates from BioModels Database: A Database of Annotated Published Models. It is copyright (c) 2005-2010 The BioModels Team.For more information see the terms of use.To cite BioModels Database, please use Le Novère N., Bornstein B., Broicher A., Courtot M., Donizelli M., Dharuri H., Li L., Sauro H., Schilstra M., Shapiro B., Snoep J.L., Hucka M. (2006) BioModels Database: A Free, Centralized Database of Curated, Published, Quantitative Kinetic Models of Biochemical and Cellular Systems Nucleic Acids Res., 34: D689-D691.

SUBMITTER: Enuo He

PROVIDER: BIOMD0000000074 | BioModels | 2006-10-19

REPOSITORIES: BioModels

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Publications

Toward a detailed computational model for the mammalian circadian clock.

Leloup Jean-Christophe JC Goldbeter Albert A

Proceedings of the National Academy of Sciences of the United States of America 20030529 12

We present a computational model for the mammalian circadian clock based on the intertwined positive and negative regulatory loops involving the Per, Cry, Bmal1, Clock, and Rev-Erb alpha genes. In agreement with experimental observations, the model can give rise to sustained circadian oscillations in continuous darkness, characterized by an antiphase relationship between Per/Cry/Rev-Erbalpha and Bmal1 mRNAs. Sustained oscillations correspond to the rhythms autonomously generated by suprachiasmat ...[more]

PMID: 12775757

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Project description:Sphingomonas wittichii strain RW1 (RW1) is one of few strains that can grow on dibenzo-p-dioxin (DD). We conducted a transcriptomic study of RW1 using RNA-Seq to outline transcriptional responses to DD, dibenzofuran (DF), and the smectite clay mineral saponite (SAP), an important geosorbent of toxicants in soil, with succinate as carbon source. The ability to grow on DD is rare compared to growth on the chemically similar DF even though the same initial dioxygenase may be involved in oxidation of both substrates. Therefore we hypothesized the reason for this lies beyond catabolic pathways and may concern genes involved in processes for cell-substrate interactions such as substrate recognition and transport, and detoxification. Compared to succinate (SUC) as control carbon source, DF caused over 240 protein-coding genes to be differentially expressed, whereas more than 300 were differentially expressed with DD. Stress response genes were up-regulated by both DD and DF. This effect was stronger with DD than DF, suggesting a higher toxicity of DD compared to DF. Both DD and DF caused changes in expression of genes involved in active cross-membrane transport such as TonB dependent receptor proteins, but the patterns of changes differed between the two substrates. Multiple transcription factor genes also displayed expression patterns distinct to DD and DF growth. DD and DF induced the catechol ortho- and the salicylate/gentisate pathways, respectively. Both DD and DF induced the shared down-stream aliphatic intermediate compound pathway. Clay (SAP) caused category-wide down-regulation of genes for cell motility and chemotaxis, particularly those involved in the synthesis, assembly and functioning of flagella. This is environmentally important finding because clay is a major component of soil microbes’ microenvironment influencing local chemistry and may serve as geosorbent for toxic pollutants. Similar to clay, DD and DF also affect motility and chemotaxis.

Dataset Information

Leloup2003_CircClock_DD_REV-ERBalpha

Publications

Toward a detailed computational model for the mammalian circadian clock.

Similar Datasets

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