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Sökning: WFRF:(Welkenhuysen Niek 1988)

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1.
  • Bodvard, Kristofer, 1981, et al. (författare)
  • Light-sensing via hydrogen peroxide and a peroxiredoxin
  • 2017
  • Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723 .- 2041-1723. ; 8
  • Tidskriftsartikel (refereegranskat)abstract
    • Yeast lacks dedicated photoreceptors; however, blue light still causes pronounced oscillations of the transcription factor Msn2 into and out of the nucleus. Here we show that this poorly understood phenomenon is initiated by a peroxisomal oxidase, which converts light into a hydrogen peroxide (H2O2) signal that is sensed by the peroxiredoxin Tsa1 and transduced to thioredoxin, to counteract PKA-dependent Msn2 phosphorylation. Upon H2O2, the nuclear retention of PKA catalytic subunits, which contributes to delayed Msn2 nuclear concentration, is antagonized in a Tsa1-dependent manner. Conversely, peroxiredoxin hyperoxidation interrupts the H2O2 signal and drives Msn2 oscillations by superimposing on PKA feedback regulation. Our data identify a mechanism by which light could be sensed in all cells lacking dedicated photoreceptors. In particular, the use of H2O2 as a second messenger in signalling is common to Msn2 oscillations and to light-induced entrainment of circadian rhythms and suggests conserved roles for peroxiredoxins in endogenous rhythms.
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2.
  • Borgqvist, Johannes, 1990, et al. (författare)
  • Synergistic effects of repair, resilience and retention of damage determine the conditions for replicative ageing
  • 2020
  • Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322 .- 2045-2322. ; 10:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Accumulation of damaged proteins is a hallmark of ageing, occurring in organisms ranging from bacteria and yeast to mammalian cells. During cell division in Saccharomyces cerevisiae, damaged proteins are retained within the mother cell, resulting in an ageing mother while a new daughter cell exhibits full replicative potential. The cell-specific features determining the ageing remain elusive. It has been suggested that the replicative ageing is dependent on the ability of the cell to repair and retain pre-existing damage. To deepen the understanding of how these factors influence the life of individual cells, we developed and experimentally validated a dynamic model of damage accumulation accounting for replicative ageing on the single cell level. The model includes five essential properties: cell growth, damage formation, damage repair, cell division and cell death, represented in a theoretical framework describing the conditions allowing for replicative ageing, starvation, immortality or clonal senescence. We introduce the resilience to damage, which can be interpreted as the difference in volume between an old and a young cell. We show that the capacity to retain damage deteriorates with high age, that asymmetric division allows for retention of damage, and that there is a trade-off between retention and the resilience property. Finally, we derive the maximal degree of asymmetry as a function of resilience, proposing that asymmetric cell division is beneficial with respect to replicative ageing as it increases the lifespan of a given organism. The proposed model contributes to a deeper understanding of the ageing process in eukaryotic organisms.
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3.
  • Braam, Svenja, 1989, et al. (författare)
  • Exploring carbon source related localization and phosphorylation in the Snf1/Mig1 network using population and single cell-based a pproaches
  • 2024
  • Ingår i: MICROBIAL CELL. - 2311-2638. ; 11:1, s. 143-154
  • Tidskriftsartikel (refereegranskat)abstract
    • The AMPK/SNF1 pathway governs energy balance in eukaryotic cells, notably influencing glucose de-repression. In S. cerevisiae , Snf1 is phosphorylated and hence activated upon glucose depletion. This activation is required but is not sufficient for mediating glucose de-repression, indicating further glucosedependent regulation mechanisms. Employing fluorescence recovery after photobleaching (FRAP) in conjunction with non -linear mixed effects modelling, we explore the spatial dynamics of Snf1 as well as the relationship between Snf1 phosphorylation and its target Mig1 controlled by hexose sugars. Our results suggest that inactivation of Snf1 modulates Mig1 localization and that the kinetic of Snf1 localization to the nucleus is modulated by the presence of non -fermentable carbon sources. Our data offer insight into the true complexity of regulation of this central signaling pathway in orchestrating cellular responses to fluctuating environmental cues. These insights not only expand our understanding of glucose homeostasis but also pave the way for further studies evaluating the importance of Snf1 localization in relation to its phosphorylation state and regulation of downstream targets.
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4.
  • Braam, Svenja, 1989, et al. (författare)
  • Exploring carbon source related localization and phosphorylation in the Snf1/Mig1 network using population and single cell-based approaches
  • 2024
  • Ingår i: Microbial Cell. - 2311-2638. ; 11:1, s. 143-154
  • Tidskriftsartikel (refereegranskat)abstract
    • The AMPK/SNF1 pathway governs energy balance in eukaryotic cells, notably influencing glucose de-repression. In S. cerevisiae, Snf1 is phosphorylated and hence activated upon glucose depletion. This activation is required but is not sufficient for mediating glucose de-repression, indicating further glucose-dependent regulation mechanisms. Employing fluorescence recovery after photobleaching (FRAP) in conjunction with non-linear mixed effects modelling, we explore the spatial dynamics of Snf1 as well as the relationship between Snf1 phosphorylation and its target Mig1 controlled by hexose sugars. Our results suggest that inactivation of Snf1 modulates Mig1 localization and that the kinetic of Snf1 localization to the nucleus is modulated by the presence of non-fermentable carbon sources. Our data offer insight into the true complexity of regulation of this central signaling pathway in orchestrating cellular responses to fluctuating environmental cues. These insights not only expand our understanding of glucose homeostasis but also pave the way for further studies evaluating the importance of Snf1 localization in relation to its phosphorylation state and regulation of downstream targets.
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5.
  • Persson, Sebastian, 1996, et al. (författare)
  • Fine-Tuning of Energy Levels Regulates SUC2 via a SNF1-Dependent Feedback Loop
  • 2020
  • Ingår i: Frontiers in Physiology. - : Frontiers Media SA. - 1664-042X. ; 11
  • Tidskriftsartikel (refereegranskat)abstract
    • Nutrient sensing pathways are playing an important role in cellular response to different energy levels. In budding yeast, Saccharomyces cerevisiae, the sucrose non-fermenting protein kinase complex SNF1 is a master regulator of energy homeostasis. It is affected by multiple inputs, among which energy levels is the most prominent. Cells which are exposed to a switch in carbon source availability display a change in the gene expression machinery. It has been shown that the magnitude of the change varies from cell to cell. In a glucose rich environment Snf1/Mig1 pathway represses the expression of its downstream target, such as SUC2. However, upon glucose depletion SNF1 is activated which leads to an increase in SUC2 expression. Our single cell experiments indicate that upon starvation, gene expression pattern of SUC2 shows rapid increase followed by a decrease to initial state with high cell-to-cell variability. The mechanism behind this behavior is currently unknown. In this work we study the long-term behavior of the Snf1/Mig1 pathway upon glucose starvation with a microfluidics and non-linear mixed effect modeling approach. We show a negative feedback mechanism, involving Snf1 and Reg1, which reduces SUC2 expression after the initial strong activation. Snf1 kinase activity plays a key role in this feedback mechanism. Our systems biology approach proposes a negative feedback mechanism that works through the SNF1 complex and is controlled by energy levels. We further show that Reg1 likely is involved in the negative feedback mechanism.
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6.
  • Persson, Sebastian, 1996, et al. (författare)
  • Scalable and flexible inference framework for stochastic dynamic single-cell models
  • 2022
  • Ingår i: PLoS Computational Biology. - : Public Library of Science (PLoS). - 1553-734X .- 1553-7358. ; 18
  • Tidskriftsartikel (refereegranskat)abstract
    • Understanding the inherited nature of how biological processes dynamically change over time and exhibit intra- and inter-individual variability, due to the different responses to environmental stimuli and when interacting with other processes, has been a major focus of systems biology. The rise of single-cell fluorescent microscopy has enabled the study of those phenomena. The analysis of single-cell data with mechanistic models offers an invaluable tool to describe dynamic cellular processes and to rationalise cell-to-cell variability within the population. However, extracting mechanistic information from single-cell data has proven difficult. This requires statistical methods to infer unknown model parameters from dynamic, multi-individual data accounting for heterogeneity caused by both intrinsic (e.g. variations in chemical reactions) and extrinsic (e.g. variability in protein concentrations) noise. Although several inference methods exist, the availability of efficient, general and accessible methods that facilitate modelling of single-cell data, remains lacking. Here we present a scalable and flexible framework for Bayesian inference in state-space mixed-effects single-cell models with stochastic dynamic. Our approach infers model parameters when intrinsic noise is modelled by either exact or approximate stochastic simulators, and when extrinsic noise is modelled by either time-varying, or time-constant parameters that vary between cells. We demonstrate the relevance of our approach by studying how cell-to-cell variation in carbon source utilisation affects heterogeneity in the budding yeast Saccharomyces cerevisiae SNF1 nutrient sensing pathway. We identify hexokinase activity as a source of extrinsic noise and deduce that sugar availability dictates cell-to-cell variability.
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7.
  • Reith, Patrick Philipp, 1991, et al. (författare)
  • The Effect of Lithium on the Budding Yeast Saccharomyces cerevisiae upon Stress Adaptation
  • 2022
  • Ingår i: Microorganisms. - : MDPI AG. - 2076-2607. ; 10:3
  • Tidskriftsartikel (refereegranskat)abstract
    • Lithium salts are used in the treatment of mood disorders, cancer, and Alzheimer's disease. It has been shown to prolong life span in several phyla; however, not yet in budding yeast. In our study, we investigate the influence of lithium on yeast cells' viability by characterizing protein aggregate formation, cell volume, and molecular crowding in the context of stress adaptation. While our data suggest a concentration-dependent growth inhibition caused by LiCl, we show an extended long-term survival rate as an effect of lithium addition upon glucose deprivation. We show that caloric restriction mitigates the negative impact of LiCl on cellular survival. Therefore, we suggest that lithium could affect glucose metabolism upon caloric restriction, which could explain the extended long-term survival observed in our study. We find furthermore that lithium chloride did not affect an immediate salt-induced Hsp104-dependent aggregate formation but cellular adaptation to H2O2 and acute glucose starvation. We presume that different salt types and concentrations interfere with effective Hsp104 recruitment or its ATP-dependent disaggregase activity as a response to salt stress. This work provides novel details of Li+ effect on live eukaryotic cells which may also be applicable in further research on the treatment of cancer, Alzheimer's, or other age-related diseases in humans.
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8.
  • Roger, Friederike, et al. (författare)
  • Peroxiredoxin promotes longevity and H2O2-resistance in yeast through redox-modulation of protein kinase A
  • 2020
  • Ingår i: eLife. - 2050-084X. ; 9, s. 1-32
  • Tidskriftsartikel (refereegranskat)abstract
    • Peroxiredoxins are H2O2 scavenging enzymes that also carry out H2O2 signaling and chaperone functions. In yeast, the major cytosolic peroxiredoxin, Tsa1 is required for both promoting resistance to H2O2 and extending lifespan upon caloric restriction. We show here that Tsa1 effects both these functions not by scavenging H2O2, but by repressing the nutrient signaling Ras-cAMP-PKA pathway at the level of the protein kinase A (PKA) enzyme. Tsa1 stimulates sulfenylation of cysteines in the PKA catalytic subunit by H2O2 and a significant proportion of the catalytic subunits are glutathionylated on two cysteine residues. Redox modification of the conserved Cys243 inhibits the phosphorylation of a conserved Thr241 in the kinase activation loop and enzyme activity, and preventing Thr241 phosphorylation can overcome the H2O2 sensitivity of Tsa1-deficient cells. Results support a model of aging where nutrient signaling pathways constitute hubs integrating information from multiple aging-related conduits, including a peroxiredoxin-dependent response to H2O2.
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9.
  • Schmidt, G. W., et al. (författare)
  • Mig1 localization exhibits biphasic behavior which is controlled by both metabolic and regulatory roles of the sugar kinases
  • 2020
  • Ingår i: Molecular Genetics and Genomics. - : Springer Science and Business Media LLC. - 1617-4615 .- 1617-4623. ; 295, s. 1489-1500
  • Tidskriftsartikel (refereegranskat)abstract
    • Glucose, fructose and mannose are the preferred carbon/energy sources for the yeastSaccharomyces cerevisiae. Absence of preferred energy sources activates glucose derepression, which is regulated by the kinase Snf1. Snf1 phosphorylates the transcriptional repressor Mig1, which results in its exit from the nucleus and subsequent derepression of genes. In contrast, Snf1 is inactive when preferred carbon sources are available, which leads to dephosphorylation of Mig1 and its translocation to the nucleus where Mig1 acts as a transcription repressor. Here we revisit the role of the three hexose kinases, Hxk1, Hxk2 and Glk1, in glucose de/repression. We demonstrate that all three sugar kinases initially affect Mig1 nuclear localization upon addition of glucose, fructose and mannose. This initial import of Mig1 into the nucleus was temporary; for continuous nucleocytoplasmic shuttling of Mig1, Hxk2 is required in the presence of glucose and mannose and in the presence of fructose Hxk2 or Hxk1 is required. Our data suggest that Mig1 import following exposure to preferred energy sources is controlled via two different pathways, where (1) the initial import is regulated by signals derived from metabolism and (2) continuous shuttling is regulated by the Hxk2 and Hxk1 proteins. Mig1 nucleocytoplasmic shuttling appears to be important for the maintenance of the repressed state in which Hxk1/2 seems to play an essential role.
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10.
  • Schnitzer, Barbara Maria, 1992, et al. (författare)
  • The effect of stress on biophysical characteristics of misfolded protein aggregates in living Saccharomyces cerevisiae cells
  • 2022
  • Ingår i: Experimental Gerontology. - : Elsevier BV. - 1873-6815 .- 0531-5565. ; 162
  • Forskningsöversikt (refereegranskat)abstract
    • Aggregation of misfolded or damaged proteins is often attributed to numerous metabolic and neurodegenerative disorders. To reveal underlying mechanisms and cellular responses, it is crucial to investigate protein aggregate dynamics in cells. Here, we used super-resolution single-molecule microscopy to obtain biophysical characteristics of individual aggregates of a model misfolded protein ∆ssCPY* labelled with GFP. We demonstrated that oxidative and hyperosmotic stress lead to increased aggregate stoichiometries but not necessarily the total number of aggregates. Moreover, our data suggest the importance of the thioredoxin peroxidase Tsa1 for the controlled sequestering and clearance of aggregates upon both conditions. Our work provides novel insights into the understanding of the cellular response to stress via revealing the dynamical properties of stress-induced protein aggregates.
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11.
  • Shashkova, Sviatlana, 1987, et al. (författare)
  • Molecular communication: crosstalk between the Snf1 and other signaling pathways
  • 2015
  • Ingår i: Fems Yeast Research. - : Oxford University Press (OUP). - 1567-1356 .- 1567-1364. ; 15:4
  • Tidskriftsartikel (refereegranskat)abstract
    • The yeast Saccharomyces cerevisiae employs different conserved signaling pathways to adapt to altered availability of nutrient and energy sources. Crosstalk between the pathways occurs to integrate different internal and external stimuli and adjust cellular metabolism, growth and proliferation to altered environmental conditions. The main glucose repression pathway, Snf1/Mig1, plays an essential role in adaptation to glucose limitation. However, the Snf1 protein kinase is also involved in regulation of many other cellular processes. We summarize evidence that Snf1 is part of a network of communicating pathways, and we suggest research directions that may help elucidating signal flow within this network.
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12.
  • Talemi, Soheil Rastgou, et al. (författare)
  • Systems Level Analysis of the Yeast Osmo-Stat
  • 2016
  • Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 6
  • Tidskriftsartikel (refereegranskat)abstract
    • Adaptation is an important property of living organisms enabling them to cope with environmental stress and maintaining homeostasis. Adaptation is mediated by signaling pathways responding to different stimuli. Those signaling pathways might communicate in order to orchestrate the cellular response to multiple simultaneous stimuli, a phenomenon called crosstalk. Here, we investigate possible mechanisms of crosstalk between the High Osmolarity Glycerol (HOG) and the Cell Wall Integrity (CWI) pathways in yeast, which mediate adaptation to hyper- and hypo-osmotic challenges, respectively. We combine ensemble modeling with experimental investigations to test in quantitative terms different hypotheses about the crosstalk of the HOG and the CWI pathways. Our analyses indicate that for the conditions studied i) the CWI pathway activation employs an adaptive mechanism with a variable volume-dependent threshold, in contrast to the HOG pathway, whose activation relies on a fixed volume-dependent threshold, ii) there is no or little direct crosstalk between the HOG and CWI pathways, and iii) its mainly the HOG alone mediating adaptation of cellular osmotic pressure for both hyper- as well as hypo-osmotic stress. Thus, by iteratively combining mathematical modeling with experimentation we achieved a better understanding of regulatory mechanisms of yeast osmo-homeostasis and formulated new hypotheses about osmo-sensing.
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13.
  • Welkenhuysen, Niek, 1988, et al. (författare)
  • Applying microfluidic systems to study effects of glucose at single-cell level
  • 2018
  • Ingår i: Glucose Transport. Methods in Molecular Biology. - New York : Humana Press. - 9781493975075 ; , s. 109-121
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • Microfluidic systems in combination with microscopy (e.g., fluorescence) can be a powerful tool to study, at single-cell level, the behavior and morphology of biological cells after uptake of glucose. Here, we briefly discuss the advantages of using microfluidic systems. We further describe how microfluidic systems are fabricated and how they are utilized. Finally, we discuss how the large amount of data can be analyzed in a “semi-automatic” manner using custom-made software. In summary, we provide a guide to how to use microfluidic systems in single-cell studies. © Springer Science+Business Media LLC 2018.
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14.
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16.
  • Welkenhuysen, Niek, 1988, et al. (författare)
  • Robustness of Nutrient Signaling Is Maintained by Interconnectivity Between Signal Transduction Pathways
  • 2019
  • Ingår i: Frontiers in Physiology. - : Frontiers Media SA. - 1664-042X. ; 9
  • Tidskriftsartikel (refereegranskat)abstract
    • Systems biology approaches provide means to study the interplay between biological processes leading to the mechanistic understanding of the properties of complex biological systems. Here, we developed a vector format rule-based Boolean logic model of the yeast S. cerevisiae cAMP-PKA, Snf1, and the Snf3-Rgt2 pathway to better understand the role of crosstalk on network robustness and function. We identified that phosphatases are the common unknown components of the network and that crosstalk from the cAMP-PKA pathway to other pathways plays a critical role in nutrient sensing events. The model was simulated with known crosstalk combinations and subsequent analysis led to the identification of characteristics and impact of pathway interconnections. Our results revealed that the interconnections between the Snf1 and Snf3-Rgt2 pathway led to increased robustness in these signaling pathways. Overall, our approach contributes to the understanding of the function and importance of crosstalk in nutrient signaling.
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17.
  • Welkenhuysen, Niek, 1988, et al. (författare)
  • Single-cell study links metabolism with nutrient signaling and reveals sources of variability
  • 2017
  • Ingår i: Bmc Systems Biology. - : Springer Science and Business Media LLC. - 1752-0509. ; 11:59
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: The yeast AMPK/SNF1 pathway is best known for its role in glucose de/repression. When glucose becomes limited, the Snf1 kinase is activated and phosphorylates the transcriptional repressor Mig1, which is then exported from the nucleus. The exact mechanism how the Snf1-Mig1 pathway is regulated is not entirely elucidated. Results: Glucose uptake through the low affinity transporter Hxt1 results in nuclear accumulation of Mig1 in response to all glucose concentrations upshift, however with increasing glucose concentration the nuclear localization of Mig1 is more intense. Strains expressing Hxt7 display a constant response to all glucose concentration upshifts. We show that differences in amount of hexose transporter molecules in the cell could cause cell-to-cell variability in the Mig1-Snf1 system. We further apply mathematical modelling to our data, both general deterministic and a nonlinear mixed effect model. Our model suggests a presently unrecognized regulatory step of the Snf1-Mig1 pathway at the level of Mig1 dephosphorylation. Model predictions point to parameters involved in the transport of Mig1 in and out of the nucleus as a majorsource of cell to cell variability. Conclusions: With this modelling approach we have been able to suggest steps that contribute to the cell-to-cell variability. Our data indicate a close link between the glucose uptake rate, which determines the glycolytic rate, and the activity of the Snf1/Mig1 system. This study hence establishes a close relation between metabolism and signalling.
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18.
  • Welkenhuysen, Niek, 1988 (författare)
  • Systems-level investigation of the interaction between glucose metabolism and the Snf1/Mig1 signalling pathway
  • 2016
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Saccharomyces cerevisiae Snf1 and its mammalian homolog, AMPK, are members of a protein kinase family present throughout the Eukaryotic kingdom. AMPK plays an essential role in different cellular processes and is involved in diseases such as diabetes, obesity and cancer. Snf1 in yeast is a central component of metabolic switching and influences a broad spectrum of cellular processes such as lipid synthesis, glucose uptake and glucose metabolism. This kinase also plays a distinct role in other stress responses. When glucose becomes limiting, the Snf1 kinase phosphorylates, among others, the Mig1 transcriptional repressor causing it to exit the nucleus, resulting in derepression of gene expression. Many components of glucose signalling are already known, however there are still some caveats in our knowledge. Here, additional details are presented on how glucose metabolism influences the functioning of the Snf1/Mig1 pathway and how the glucose signalling interaction network is integrated with other cellular processes. Another aspect of this work centred on the individual yeast cells responses to glucose. Both empirical observations and mathematical modelling was used to predict the outcome of glucose signalling and to identify the source(s) of the significant cell-to-cell variability in the response to carbon source availability. We report a novel modelling approach to explain cell-to-cell variability in the response of individual yeast cells to glucose and reconstruct large signalling networks. Taken together, the importance of individuality of single yeast cells is highlighted by glucose signalling displaying considerable variability at the level of individuals. Furthermore, this work shows that glucose metabolism mediates a dynamic and stringent regulation of Snf1/Mig1 pathway dynamic.
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