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Figure 1 | BMC Bioinformatics

Figure 1

From: Constructing gene regulatory networks for long term photosynthetic light acclimation in Arabidopsis thaliana

Figure 1

Effect of light quality on gene expression. The three cell compartments are depicted schematically: chloroplast (green), cytosol (white) and nucleus (yellow). The integrated cellular network consists of two subnetworks. One network is the signaling transduction pathways in the cytosol and the other network is the gene regulatory network for transcriptional regulation in nucleus. An important mediator for PQ pool redox states is the thylakoid kinase STN7. STN7 kinase transmits the decisive signal to the nucleus, resulting in the ensuing regulation of the relative amount of each of the photosystems. However, the mechanism by which the redox signal is transmitted from the chloroplast double membrane into the cytosol is poorly understood. In this study, the gene regulatory network (the protein-DNA interaction) in the nucleus is constructed under different retrograde signals originating from different redox states in the PQ pool. The light environment is perceived by cytosolic photoreceptors. Although both PQ pool and photoreceptor systems report changes of ambient light environment by different signal transduction pathways to the nucleus, some common TFs in nucleus may be employed simultaneously in different light-related systems to respond to the prevailing environment.

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