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Sonstige beteiligte Institutionen
Background: Xenobiotics represent an environmental stress and as such are a source for antibiotics, including the isoquinoline (IQ) compound IQ-143. Here, we demonstrate the utility of complementary analysis of both host and pathogen datasets in assessing bacterial adaptation to IQ-143, a synthetic analog of the novel type N,C-coupled naphthyl-isoquinoline alkaloid ancisheynine. Results: Metabolite measurements, gene expression data and functional assays were combined with metabolic modeling to assess the effects of IQ-143 on Staphylococcus aureus, Staphylococcus epidermidis and human cell lines, as a potential paradigm for novel antibiotics. Genome annotation and PCR validation identified novel enzymes in the primary metabolism of staphylococci. Gene expression response analysis and metabolic modeling demonstrated the adaptation of enzymes to IQ-143, including those not affected by significant gene expression changes. At lower concentrations, IQ-143 was bacteriostatic, and at higher concentrations bactericidal, while the analysis suggested that the mode of action was a direct interference in nucleotide and energy metabolism. Experiments in human cell lines supported the conclusions from pathway modeling and found that IQ-143 had low cytotoxicity. Conclusions: The data suggest that IQ-143 is a promising lead compound for antibiotic therapy against staphylococci. The combination of gene expression and metabolite analyses with in silico modeling of metabolite pathways allowed us to study metabolic adaptations in detail and can be used for the evaluation of metabolic effects of other xenobiotics.
Family studies suggest a genetic component to the etiology of chronic kidney disease (CKD) and end stage renal disease (ESRD). Previously, we identified 16 loci for eGFR in genome-wide association studies, but the associations of these single nucleotide polymorphisms (SNPs) for incident CKD or ESRD are unknown. We thus investigated the association of these loci with incident CKD in 26,308 individuals of European ancestry free of CKD at baseline drawn from eight population-based cohorts followed for a median of 7.2 years (including 2,122 incident CKD cases defined as eGFR < 60ml/min/1.73m(2) at follow-up) and with ESRD in four case-control studies in subjects of European ancestry (3,775 cases, 4,577 controls). SNPs at 11 of the 16 loci (UMOD, PRKAG2, ANXA9, DAB2, SHROOM3, DACH1, STC1, SLC34A1, ALMS1/NAT8, UBE2Q2, and GCKR) were associated with incident CKD; p-values ranged from p = 4.1e-9 in UMOD to p = 0.03 in GCKR. After adjusting for baseline eGFR, six of these loci remained significantly associated with incident CKD (UMOD, PRKAG2, ANXA9, DAB2, DACH1, and STC1). SNPs in UMOD (OR = 0.92, p = 0.04) and GCKR (OR = 0.93, p = 0.03) were nominally associated with ESRD. In summary, the majority of eGFR-related loci are either associated or show a strong trend towards association with incident CKD, but have modest associations with ESRD in individuals of European descent. Additional work is required to characterize the association of genetic determinants of CKD and ESRD at different stages of disease progression.
Recent studies have shown aberrant expression of SOX11 in various types of aggressive B-cell neoplasms. To elucidate the molecular mechanisms leading to such deregulation, we performed a comprehensive SOX11 gene expression and epigenetic study in stem cells, normal hematopoietic cells and different lymphoid neoplasms. We observed that SOX11 expression is associated with unmethylated DNA and presence of activating histone marks (H3K9/14Ac and H3K4me3) in embryonic stem cells and some aggressive B-cell neoplasms. In contrast, adult stem cells, normal hematopoietic cells and other lymphoid neoplasms do not express SOX11. Such repression was associated with silencing histone marks H3K9me2 and H3K27me3. The SOX11 promoter of non-malignant cells was consistently unmethylated whereas lymphoid neoplasms with silenced SOX11 tended to acquire DNA hypermethylation. SOX11 silencing in cell lines was reversed by the histone deacetylase inhibitor SAHA but not by the DNA methyltransferase inhibitor AZA. These data indicate that, although DNA hypermethylation of SOX11 is frequent in lymphoid neoplasms, it seems to be functionally inert, as SOX11 is already silenced in the hematopoietic system. In contrast, the pathogenic role of SOX11 is associated with its de novo expression in some aggressive lymphoid malignancies, which is mediated by a shift from inactivating to activating histone modifications.
Supernumerary (B) chromosomes are dispensable elements found in many eukaryote genomes in addition to standard (A) chromosomes. In many respects, B chromosomes resemble sex chromosomes, so that a common ancestry for them has frequently been suggested. For instance, B chromosomes in grasshoppers, and other insects, show a pycnotic cycle of condensation-decondensation during meiosis remarkably similar to that of the X chromosome. In some cases, B chromosome size is even very similar to that of the X chromosome. These resemblances have led to suggest the X as the B ancestor in many cases. In addition, sex chromosome origin from B chromosomes has also been suggested. In this article, we review the existing evidence for both evolutionary pathways, as well as sex differences for B frequency at adult and embryo progeny levels, B chromosome effects or B chromosome transmission. In addition, we review cases found in the literature showing sex-ratio distortion associated with B chromosome presence, the most extreme case being the paternal sex ratio (PSR) chromosomes in some Hymenoptera. We finally analyse the possibility of B chromosome regularisation within the host genome and, as a consequence of it, whether B chromosomes can become regular members of the host genome.
The technology of organic photovoltaics offers the possibility of low-cost devices due to easy fabrication procedures and low material consumption and at the same time high flexibility concerning the applied substrates or design features such as the color palette. Owing to these benefits, this research field is highly active, being reflected by the continuously rising number of publications. Chapter 1 gives an extensive overview of a part of these reports, namely the field of solution-processed BHJ organic solar cells using small molecules as electron-donating materials. In the early years of this research area (2006-2008), well known hole transporting materials such as triphenylamine based chromophores, oligothiophenes and polyaromatic hydrocarbons were applied. However, many of these dyes lacked absorption at longer wavelengths and were therefore limited in their light harvesting qualities. Later, chromophores based on low band gap systems consisting of electron-donating and electron-accepting units showing internal charge transfer overcame this handicap. Today, donor-substituted diketopyrrolopyrroles (D-A-D chromophores), squaraines (D-A-D chromophores) and acceptor substituted oligothiophenes (A-D-A chromophores) are among the most promising dyes for small molecule based organic solar cells with PCEs of 4-5%. This work is based on the findings of the groups of Würthner and Meerholz, which tested merocyanine dyes for the first time in organic BHJ solar cells.4 According to the Bässler theory85, the high dipolarity of these dyes should hamper the charge transport, but the obtained first results with PCE of 1.7% proved the potenital of this class of dyes for this application. Merocyanine dyes offer the advantages of facile synthesis and purification, high tinctorial strength and monodispersity. Additionally, the electronic structure of the dyes, namely the absorption as well as the electrochemical properties, can be adjusted by using the right combination of donor and acceptor units. For these reasons, this class of dye is highly interesting for the application in organic solar cells. It was the aim of the thesis to build more knowledge about the potential and limitations of merocyanines in BHJ photovoltaic devices. By screening a variety of donor and acceptor groups a comprehensive data set both for the molecular materials as well as for the respective solar devices was generated and analyzed. As one focus, the arrangement of the chromophores in the solid state was investigated to gain insight about the packing in the solar cells and its relevance for the performance of the latter. To do so, X-ray single crystal analyses were performed for selected molecules. By means of correlations between molecular properties and the characteristics of the corresponding solar cells, several design rules to generate efficient chromophores for organic photovoltaics were developed. The different donor and acceptor moieties applied in this work are depicted in the following ...
Background:
Fabry disease is an inherited metabolic disorder characterized by progressive lysosomal accumulation of lipids in a variety of cell types, including neural cells. Small, unmyelinated nerve fibers are particularly affected and small fiber peripheral neuropathy often clinically manifests at young age. Peripheral pain can be chronic and/or occur as provoked attacks of excruciating pain. Manifestations of dysfunction of small autonomic fibers may include, among others, impaired sweating, gastrointestinal dysmotility, and abnormal pain perception. Patients with Fabry disease often remain undiagnosed until severe complications involving the kidney, heart, peripheral nerves and/or brain have arisen.
Methods:
An international expert panel convened with the goal to provide guidance to clinicians who may encounter unrecognized patients with Fabry disease on how to diagnose these patients early using simple diagnostic tests. A further aim was to offer recommendations to control neuropathic pain.
Results:
We describe the neuropathy in Fabry disease, focusing on peripheral small fiber dysfunction - the hallmark of early neurologic involvement in this disorder. The clinical course of peripheral pain is summarized, and the importance of medical history-taking, including family history, is highlighted. A thorough physical examination (e. g., angiokeratoma, corneal opacities) and simple non-invasive sensory perception tests could provide clues to the diagnosis of Fabry disease. Reported early clinical benefits of enzyme replacement therapy include reduction of neuropathic pain, and adequate management of residual pain to a tolerable and functional level can substantially improve the quality of life for patients.
Conclusions:
Our recommendations can assist in diagnosing Fabry small fiber neuropathy early, and offer clinicians guidance in controlling peripheral pain. This is particularly important since management of pain in young patients with Fabry disease appears to be inadequate.
In this thesis we consider a reactive transport model with precipitation dissolution reactions from the geosciences. It consists of PDEs, ODEs, algebraic equations (AEs) and complementary conditions (CCs). After discretization of this model we get a huge nonlinear and nonsmooth equation system. We tackle this system with the semismooth Newton method introduced by Qi and Sun. The focus of this thesis is on the application and convergence of this algorithm. We proof that this algorithm is well defined for this problem and local even quadratic convergent for a BD-regular solution. We also deal with the arising linear equation systems, which are large and sparse, and how they can be solved efficiently. An integral part of this investigation is the boundedness of a certain matrix-valued function, which is shown in a separate chapter. As a side quest we study how extremal eigenvalues (and singular values) of certain PDE-operators, which are involved in our discretized model, can be estimated accurately.
Background:
Chloroplast-encoded genes (matK and rbcL) have been formally proposed for use in DNA barcoding efforts targeting embryophytes. Extending such a protocol to chlorophytan green algae, though, is fraught with problems including non homology (matK) and heterogeneity that prevents the creation of a universal PCR toolkit (rbcL). Some have advocated the use of the nuclear-encoded, internal transcribed spacer two (ITS2) as an alternative to the traditional chloroplast markers. However, the ITS2 is broadly perceived to be insufficiently conserved or to be confounded by introgression or biparental inheritance patterns, precluding its broad use in phylogenetic reconstruction or as a DNA barcode. A growing body of evidence has shown that simultaneous analysis of nucleotide data with secondary structure information can overcome at least some of the limitations of ITS2. The goal of this investigation was to assess the feasibility of an automated, sequence-structure approach for analysis of IT2 data from a large sampling of phylum Chlorophyta.
Methodology/Principal Findings:
Sequences and secondary structures from 591 chlorophycean, 741 trebouxiophycean and 938 ulvophycean algae, all obtained from the ITS2 Database, were aligned using a sequence structure-specific scoring matrix. Phylogenetic relationships were reconstructed by Profile Neighbor-Joining coupled with a sequence structure-specific, general time reversible substitution model. Results from analyses of the ITS2 data were robust at multiple nodes and showed considerable congruence with results from published phylogenetic analyses.
Conclusions/Significance:
Our observations on the power of automated, sequence-structure analyses of ITS2 to reconstruct phylum-level phylogenies of the green algae validate this approach to assessing diversity for large sets of chlorophytan taxa. Moreover, our results indicate that objections to the use of ITS2 for DNA barcoding should be weighed against the utility of an automated, data analysis approach with demonstrated power to reconstruct evolutionary patterns for highly divergent lineages.
Pericyclic reactions possess changed reactivities in the excited state compared to the ground state which complement each other, as can be shown by simple frontier molecular orbital analysis. Hence, most molecules that undergo pericyclic reactions feature two different photochemical pathways. In this thesis an investigation of the first nanoseconds after excitation of Diazo Meldrum’s acid (DMA) is presented. The time-resolved absorption change in the mid-infrared spectral region revealed indeed two reaction pathways after excitation of DMA with at least one of them being a pericyclic reaction (a sigmatropic rearrangement). These two pathways most probably start from different electronic states and make the spectroscopy of DMA especially interesting. Femtochemistry also allows the spectroscopy of very short-lived intermediates, which is discussed in context of the sequential mechanism of the Wolff rearrangement of DMA. An interesting application of pericyclic reactions are also molecular photoswitches, i.e. molecules that can be switched by light between two stable states. This work presents a photoswitch on the basis of a 6-pi-electrocyclic reaction, whose reaction dynamics after excitation are unravelled with transient-absorption spectroscopy for both switching directions. The 6-pi-electrocyclic reaction is especially attractive, because of the huge electronic changes and subsequent absorption changes upon switching between the ring-open and ring-closed form. Fulgides, diarlyethenes, maleimides as well as spiropyrans belong to this class of switches. Despite the popularity of spiropyrans, the femtochemistry of the ring-open form (“merocyanine”) is still unknown to a great extent. The experiments in this thesis on this system combined with special modeling algorithms allowed to determine the quantum efficiencies of all reaction pathways of the system, including the ring-closure pathway. With the knowledge of the reaction dynamics, a multipulse control experiment showed that bidirectional full-cycle switching between the two stable states on an ultrafast time scale is possible. Such a controlled ultrafast switching is a process which is inaccessible with conventional light sources and may allow faster switching electronics in the future. Theoretical calculations suggest an enantioselective photochemistry, i.e. to influence the chirality of the emerging molecule with the chirality of the light, a field called “chiral control”. The challenges that need to be overcome to prove a successful chiral control are extremely hard, since enantiosensitive signals, such as circular dichroism, are inherently very small. Hence, chiral control calls for a very sensitive detection as well as an experiment that cancels all effects that may influence the enantiosensitive signal. The first challenge, the sensitive detection, is solved with a polarimeter, which is optimized to be combined with femtosecond spectroscopy. This polarimeter will be an attractive tool for future chiral-control experiments due to its extreme sensitivity. The second challenge, the design of an artefact-free experiment, gives rise to a variety of new questions. The polarization state of the light is the decisive property in such an experiment, because on the one hand the polarization carries the chiral information of the excitation and on the other hand the change of the polarization or the intensity change dependent on the polarization is used as the enantiosensitive probing signal. A new theoretical model presented in this thesis allows to calculate the anisotropic distribution of any given pump-probe experiment in which any pulse can have any polarization state. This allows the design of arbitrary experiments for example polarization shaped pump-probe experiments. Furthermore a setup is presented and simulated that allows the shot-to-shot switching between mirror-images of light polarization states. It can be used either for control experiments in which the sample is excited with mirror-images of the pump polarization or for spectroscopy purposes, such as transient circular dichroism or transient optical rotatory dispersion. The spectroscopic results of this thesis may serve as a basis for these experiments. The parallel and sequential photochemical pathways of DMA and the feasibility of the bidirectional switching of 6,8-dinitro BIPS in a pump–repump experiment on the one hand offer a playground to test the relation of the anisotropy with the polarization of the pump, repump and probe pulse. On the other hand control experiments with varying pump and repump polarization may be able to take influence on the dynamics after excitation. Especially interesting is the combination of the 6,8-dinitro BIPS with the polarization-mirroring setup, because the closed form (spiropyran) is chiral. Perhaps in the future it will be possible to prove a cumulative circular-dichroism effect or even a chiral control with this system.