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Veröffentlicht Kristin Steinmüller | Dienstag, 26. September 2017

Mol Biol Cell Long-term simulation of compound concentration in a branched hypha. A new self-assembled peroxisomal vesicle required for efficient resealing of the plasma membrane. Heterogeneity is maintained by septal closure that prevents intercompartmental cytosolic mixing within and between hyphae

It was found that activation of a gene after separation by two septa was the most effective way to obtain the largest concentration differences between two apical neighboring tips Fig. Biochem Biophys Res Commun This shows that cytosolic streaming still has limited effect on reducing heterogeneity on longer time scales. Subsequently, we elaborated how the septal pore diameter would affect the concentration of a compound in the producing compartment assuming that the rate of diffusion through the septal pore is linearly dependent on its cross-sectional area note that diffusion rates will be lower close to septal pore walls. B Short-term model representation of the hypha using a 1-dimensional diffusion model. This allowed us to determine the posterior distributions of the diffusion coefficients.

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Notably, the longer the septal pore had been closed, the lower the calculated pore width was Fig. Changing these values had limited effect on the concentration peaks at the apical tip Fig. The compound degradation half-life and septal plugging rate were varied to determine the extent of their effect. Based on electron microscopy images 16 , 44 ; our data , it can be calculated that the difference in cross-sectional area of a septal pore compared to that of the hypha matches the difference in the fold change in diffusion.

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For an alternate route to mBio. In the simulation, a compound was produced in the 2nd compartment at a constant rate for 2 min. Gillian Turgeon, Cornell University. The model showed that reversible septal plugging has a major impact on intercompartmental cytosolic streaming. A simulation was performed to assess the impact of the low septal diffusion coefficient on intercompartmental streaming. Mixing became ineffective when there were more than 4 septa that switched between the open and closed states Fig.

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Unicellular and Multicellular

Our hypothesis was that cytosolic continuity is limited by septal plugging and by the diameter of the open septal pore. The septal pore cap mediates septal plugging in the basidiomycete Schizophyllum commune. E Cytosolic continuity between branches at different growth stages.

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It should be noted that organelles like vacuoles regularly are found near the septal pore. The mycelium of the lower fungi like the Zygomycota consists of hyphae that are nonseptate. A unicellular organization may support growth of rapidly growing leading hyphae.

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However, an approximation based on Fig. All diffusion coefficients throughout this study were obtained by model fitting. Here, f represents fluorescence, t is time, x is the position in the hypha, and D is the diffusion coefficient. Samples with higher likelihood have a higher chance of being retained, such that their density represents the posterior distribution. Xu XM , Jackson D. Particles in the hyphae of unknown identity moved with approximately fold-lower speed.

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The model simulates the fluorescence signal profile over time for each point along the hypha. Instead each component is iteratively simulated according to its maximum time step size. In ascomycetes, Woronin bodies plug septal pores. Mitotic regulation of fungal cell-to-cell connectivity through septal pores involves the NIMA kinase.

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Here, we elaborated on this study assessing the impact of both open and closed septa on intercompartmental cytosolic streaming. Relatively large differences were observed between septal diffusion coefficients ranging from 0. Occlusion of the septal pores of damaged hyphae of Neurospora crassa by hexagonal crystals. Spatial differentiation in the vegetative mycelium of Aspergillus niger. Septal pore plugging is not affected by low pH

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Under both growth conditions, the diffusion rate was higher in the first septum than in the second septum. Pores in fungal septa enable cytoplasmic streaming between hyphae and their compartments. This was done within the Bayesian framework to account for uncertainty in the diffusion coefficients. Curr Opin Plant Biol

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Line colors refer to the measurement points in panel D. Long-term simulation of compound concentration in a branched hypha. As a consequence, hyphal heterogeneity was strongly reduced. Instead each component is iteratively simulated according to its maximum time step size. A The compound concentration was measured in hyphal tips and branch points.

The apical septum is closed. A The fluorescence signal is measured at 3 locations measurement points. It is shown that the youngest part of a growing hypha can be considered unicellular, while the older part has a multicellular organization. Xu XM , Jackson D.

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  1. Time-lapse movies showed that in 20 out of 52 compartments, PA-GFP started to stream to neighboring compartments within a h period. To this end, samples from the prior distributions are scored on model likelihood, which is determined by comparing the measured fluorescence profiles with the fluorescence profiles observed in the model at the corresponding locations. In contrast, the diffusion coefficient for the first septum was only 0.
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  2. Here, f represents fluorescence, t is time, x is the position in the hypha, and D is the diffusion coefficient. Intrinsically disordered proteins aggregate at fungal cell-to-cell channels and regulate intercellular connectivity. The number of septa per hyphal unit, incidence and dynamics of septal closure, and rate of streaming of molecules within the hyphal compartments and through the septal pores was determined and used as input for a model of cytosolic continuity.
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Next, we determined whether diffusion rates could be affected by the plugging state of nearby septa. Diffusion effectively mixed the cytoplasm of the two hyphae in the absence of septa Fig. B Influence of open septa on concentration of compounds.

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Here it was assessed to which extent open pores affect intercompartmental streaming. The impact of the cytoskeleton on cytosolic streaming can be explained by turbulence created by bidirectional movement of molecular motors and their cargo along the cytoskeleton PA-GFP was used to monitor streaming of cytosol.

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Together, data show that apical compartments of growing hyphae behave unicellularly, while older compartments have a multicellular organization. The lumen of these peroxisome-derived organelles 13 , 21 — 23 is filled with hexagonal rods of the HexA protein 13 , Xu XM , Jackson D. Notably, the longer the septal pore had been closed, the lower the calculated pore width was Fig.

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