Absolute units for proteins in Arabidopsis clock models up to U2020.5

The dataset presents mathematical models of the gene regulatory network of the circadian clock, in the plant Arabidopsis thaliana. The work will be published as Urquiza-Garcia, Molina, Halliday and Millar, title "Abundant clock proteins point to missing molecular regulation in the plant circadian clock", in Molecular Systems Biology, 2025.

Starting from the U2019.3 and U2020.3 models, this project rescales parameters to match protein levels that were predicted using a simple model from the TiMet ...

Submitter: Andrew Millar

Studies: Construction of NanoLUC-tagged plants, Estimating DNA-binding affinities for Arabidopsis proteins, Measuring absolute levels of clock proteins with calibrated NanoLUC assays, Predicting absolute levels of clock proteins with a simple model, Recalibrating the clock models for absolute protein levels, to create mo..., Reproducibility documentation

Assays: Clock protein number determination with NanoLUC calibration, Clock proteins NanoLUC fusion raw data, Gatway maps of genomic regions of clock genes, In vivo bioluminescence of clock protein-NanoLUC fusions: example experi..., Jupyter notebook Predicting Protein Numbers, Propagating scaling factors into model parameters for U2019.4->U2019.5 a..., Protein level time series, Python packages, Reproducibility tool set, Selection of complemented transgenic lines, TiMet RNA timeseries data, promoter binding affinity calculations on the genome based on PBMs and E...

Expanding the bioluminescent reporter toolkit for plant science with NanoLUC

Abstract (Expand)

Protein data over circadian time scale is scarce for clock transcription factors. Further work in this direction is required for refining quantitative clock models. However, gathering highly resolved … dynamics of low-abundance transcription factors has been a major challenge in the field. In this work we provide a new tool that could help this major issue. Bioluminescence is an important tool for gathering data on circadian gene expression. It allows data collection over extended time periods for low signal levels, thanks to a large signal-to-noise ratio. However, the main reporter so far used, firefly luciferase (FLUC), presents some disadvantages for reporting total protein levels. For example, the rapid, post-translational inactivation of this luciferase will result in underestimation of protein numbers. A more stable reporter protein could in principle tackle this issue. We noticed that NanoLUC might fill this gap, given its reported brightness and the stability of both enzyme and substrate. However, no data in plant systems on the circadian time scale had been reported.

Authors: Uriel Urquiza-García, Andrew J. Millar

Date Published: 1st Dec 2019

Publication Type: Journal

Spontaneous spatiotemporal waves of gene expression from biological clocks in the leaf

Abstract (Expand)

The circadian clocks that drive daily rhythms in animals are tightly coupled among the cells of some tissues. The coupling profoundly affects cellular rhythmicity and is central to contemporary … understanding of circadian physiology and behavior. In contrast, studies of the clock in plant cells have largely ignored intercellular coupling, which is reported to be very weak or absent. We used luciferase reporter gene imaging to monitor circadian rhythms in leaves of Arabidopsis thaliana plants, achieving resolution close to the cellular level. Leaves grown without environmental cycles for up to 3 wk reproducibly showed spatiotemporal waves of gene expression consistent with intercellular coupling, using several reporter genes. Within individual leaves, different regions differed in phase by up to 17 h. A broad range of patterns was observed among leaves, rather than a common spatial distribution of circadian properties. Leaves exposed to light-dark cycles always had fully synchronized rhythms, which could desynchronize rapidly. After 4 d in constant light, some leaves were as desynchronized as leaves grown without any rhythmic input. Applying light-dark cycles to such a leaf resulted in full synchronization within 2-4 d. Thus, the rhythms of all cells were coupled to external light-dark cycles far more strongly than the cellular clocks were coupled to each other. Spontaneous desynchronization under constant conditions was limited, consistent with weak intercellular coupling among heterogeneous clocks. Both the weakness of coupling and the heterogeneity among cells are relevant to interpret molecular studies and to understand the physiological functions of the plant circadian clock.

Authors: B. Wenden, D. L. Toner, S. K. Hodge, R. Grima, A. J. Millar

Date Published: 13th Apr 2012

Publication Type: Not specified

Powered by
 (v.1.16.0)
About FAIRDOMHub | Funding and Programmes | Credits | Terms & Conditions | Imprint | Cookie preferences
Copyright © 2008 - 2024 The University of Manchester and HITS gGmbH