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The assembly of photosynthetically competent chloroplasts occurs in angiosperm seedlings when first exposed to light, and is due to the control by light of photosynthesis-associated nuclear genes (PhANGs), also dependent upon plastid-to-nucleus "biogenic" communication signals. The relationship between light- and plastid signal-regulation of PhANGs is close but poorly understood. In contrast, many conifers green in the dark and the promoter of a pine PhANG, Lhcb, is active in the dark in tobacco. Here, we show that the activity of this promoter in tobacco is sensitive to plastid photobleaching, or to the inhibition of plastid translation in the light or the dark, and the same interventions reduce expression of the native gene in pine seedlings, demonstrating classic plastid biogenic signaling in gymnosperms. Furthermore, Arabidopsis mutations causing defective plastid biogenesis suppress the effect in darkness of mutations in COP1 and DET1, repressors of photomorphogenesis, for the expression of several PhANGs but not a photosynthesis-unrelated, light-regulated gene. GLK transcriptional regulators mediate the response of LHCB but not of other tested PhANGs. We propose the ability to suppress PhANG response to positive plastid biogenic signals in the dark may have contributed to the evolution of light-controlled chloroplast biogenesis.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4674571 | PMC |
http://dx.doi.org/10.3389/fpls.2015.01078 | DOI Listing |
Arch Toxicol
December 2024
Nutrition, Metabolism and Genomics Group, Division of Human Nutrition and Health, Wageningen University, Wageningen, The Netherlands.
Propiconazole is a triazole fungicide previously shown to induce triglyceride accumulation in human liver HepaRG cells, potentially via activation of the Pregnane X Receptor (PXR). However, whether propiconazole can disrupt hepatic and whole-body metabolism in vivo is currently unknown. Therefore, we aimed to examine the metabolic effects of propiconazole in the context of metabolic dysfunction-associated steatotic liver disease (MASLD), obesity, and insulin resistance.
View Article and Find Full Text PDFMol Ecol
December 2024
School of Biological Sciences, Monash University, Clayton, Victoria, Australia.
Biochemical and evolutionary interactions between mitochondrial and nuclear genomes ('mitonuclear interactions') are proposed to underpin fundamental aspects of biology including evolution of sexual reproduction, adaptation and speciation. We investigated the role of pre-mating isolation in maintaining functional mitonuclear interactions in wild populations bearing diverged, putatively co-adapted mitonuclear genotypes. Two lineages of eastern yellow robin Eopsaltria australis-putatively climate-adapted to 'inland' and 'coastal' climates-differ by ~7% of mitogenome nucleotides, whereas nuclear genome differences are concentrated into a sex-linked region enriched with mitochondrial functions.
View Article and Find Full Text PDFG3 (Bethesda)
December 2024
Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 277, CEP 05508-090, São Paulo, SP, Brazil.
Tetrapedia diversipes is a Neotropical solitary bee commonly found in trap-nests, known for its morphological adaptations for floral oil collection and prepupal diapause during the cold and dry season. Here, we present the genome assembly of T. diversipes (332 Mbp), comprising 2,575 scaffolds, with 15,028 predicted protein-coding genes.
View Article and Find Full Text PDFJ Biochem Mol Toxicol
January 2025
Department of Translational Medicine, Clinical Research Centre, Skåne University Hospital, Lund University, Malmö, Sweden.
Berberine, an isoquinoline alkaloid derived from various medicinal plants, emerges as a potential therapeutic agent against diverse human diseases. It has particularly shown notable anticancer efficacy against breast, colorectal, lung, prostate, and liver cancer. Berberine results in inhibition of cancer cell proliferation, induction of apoptosis, and suppressing angiogenesis, positioning it as a versatile, multitargeted therapeutic tool against cancer.
View Article and Find Full Text PDFFront Cell Neurosci
December 2024
Department of Molecular Biosciences, Centre for Radiation Protection Research, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden.
Introduction And Methods: Aiming to evaluate safety aspects of a recently proposed approach to target Alzheimer's disease, we mimicked a complex boron neutron capture therapy field using a mixed beam consisting of high- and low-linear energy transfer (LET) radiation, Am alpha particles (α) and/or X-ray radiation respectively, in human microglial (HMC3) cells.
Results: Acute exposure to 2 Gy X-rays induced the strongest response in the formation of γH2AX foci 30 min post irradiation, while α- and mixed beam-induced damage (α:X-ray = 3:1) sustained longer. Fractionation of the same total dose (0.
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