144 results found
    1. Neuroscience

    Seasonal plasticity in GABAA signaling is necessary for restoring phase synchrony in the master circadian clock network

    Kayla E Rohr et al.
    A seasonal switch to excitatory GABAA signaling dictates how daily clock neurons interact to encode environmental change.
    1. Plant Biology

    Accurate timekeeping is controlled by a cycling activator in Arabidopsis

    Polly Yingshan Hsu et al.
    The circadian clock in the model plant organism Arabidopsis thaliana is best described as a highly connected network made up of clock-regulated activators and repressors of transcription, rather than two coupled, repressor-based feedback loops.
    1. Computational and Systems Biology
    2. Chromosomes and Gene Expression

    Natural changes in light interact with circadian regulation at promoters to control gene expression in cyanobacteria

    Joseph Robert Piechura et al.
    Cyanobacteria cope with both predictable day/night changes and natural fluctuations in light during the day by adjusting the expression dynamics of circadian-clock-controlled genes via a network of transcriptional regulators.
    1. Genetics and Genomics

    Expansion of the circadian transcriptome in Brassica rapa and genome-wide diversification of paralog expression patterns

    Kathleen Greenham et al.
    Whole genome duplication in Brassica rapa is accompanied by both expansion of the circadian transcriptome and widespread temporal reconfiguration of gene regulatory networks consistent with subfunctionalization among pairs of paralogs.
    1. Neuroscience

    A subset of ipRGCs regulates both maturation of the circadian clock and segregation of retinogeniculate projections in mice

    Kylie S Chew et al.
    A single subpopulation of photoreceptors constitutes a shared node in the neural networks that regulate light-dependent maturation of the circadian clock and light-independent refinement of retinal ganglion cell projections to the brain.
    1. Genetics and Genomics
    2. Neuroscience

    Dissection of central clock function in Drosophila through cell-specific CRISPR-mediated clock gene disruption

    Rebecca Delventhal et al.
    Through novel, cell-specific CRISPR tools to disrupt molecular clock genes, it was revealed that circadian rhythms are coordinated through a network, rather than by the clock of 'master regulatory' neurons.
    1. Neuroscience

    PDF neuron firing phase-shifts key circadian activity neurons in Drosophila

    Fang Guo et al.
    A few circadian ‘evening’ neurons within the Drosophila brain play a key role in driving activity as well as keeping time, whereas the well-known PDF-containing morning cells are likely involved in integrating and transmitting light information.
    1. Neuroscience

    Neuron-specific knockouts indicate the importance of network communication to Drosophila rhythmicity

    Matthias Schlichting et al.
    Network silencing experiments and cell-specific CRISPR/Cas9 knockouts suggest that network communication is necessary for generating robust rhythms within the clock neuron network.
    1. Computational and Systems Biology
    2. Physics of Living Systems

    Biophysical clocks face a trade-off between internal and external noise resistance

    Weerapat Pittayakanchit et al.
    Molecular clocks that are robust to external fluctuations are vulnerable to internal fluctuations and vice versa.
    1. Computational and Systems Biology
    2. Microbiology and Infectious Disease

    The cyanobacterial circadian clock follows midday in vivo and in vitro

    Eugene Leypunskiy et al.
    The cyanobacterial core clock tracks midday regardless of day length, which can be understood in terms of a model for how the environment alters the clock limit cycle.

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