Knocking Out A Negative Regulator Of Hedgehog Signaling Blocks Differentiation Of Cells Into Neurons, 2019 Western University
Knocking Out A Negative Regulator Of Hedgehog Signaling Blocks Differentiation Of Cells Into Neurons, Danielle Margaret Spice, Gregory M. Kelly Ph.D.
Western Research Forum
Hedgehog (Hh) signaling, one of many different protein signaling pathways found in mammals, is vital in many stage of neural development. A major negative regulator of Hh signaling is a protein known as Suppressor of Fused (SUFU), which acts to sequester the full length Gli transcription factors, proteins that can turn genes on and off, in the cytoplasm or facilitates its conversion to a repressive form. The P19 embryonal carcinoma cell line is a model of hind-brain neuronal differentiation and the involvement of Hh signaling, in particular the role of SUFU in this process has yet to be explored. We ...
Iron-Sulfur Cluster Biosynthesis In Methanogens, 2019 Louisiana State University and Agricultural and Mechanical College
Iron-Sulfur Cluster Biosynthesis In Methanogens, Cuiping Zhao
LSU Doctoral Dissertations
Methanogens live in a syntrophic consortium with bacteria, taking advantage of the metabolic abilities of their syntrophic partners to overcome energetic barriers and break down compounds that they cannot digest by themselves. Interspecies electron transfer, which is a major type of microbial communication in syntrophic processes, improves methanogenesis and anaerobic oxidization of methane (AOM) processes involved in syntrophic consortia. These processes have a significant impact on the global carbon cycle. Most of the essential enzymes involved in methanogenesis are iron-sulfur proteins. Iron-sulfur clusters are one of the oldest and most versatile cofactors present in all domains of life. To date ...
A Chromosome Folding Intermediate At The Condensin-To-Cohesin Transition During Telophase, 2019 University of Massachusetts Medical School
A Chromosome Folding Intermediate At The Condensin-To-Cohesin Transition During Telophase, Kristin Abramo, Anne-Laure Valton, Sergey V. Venev, Hakan Ozadam, A. Nicole Fox, Job Dekker
University of Massachusetts Medical School Faculty Publications
Chromosome folding is extensively modulated as cells progress through the cell cycle. During mitosis, condensin complexes fold chromosomes in helically arranged nested loop arrays. In interphase, the cohesin complex generates loops that can be stalled at CTCF sites leading to positioned loops and topologically associating domains (TADs), while a separate process of compartmentalization drives the spatial segregation of active and inactive chromatin domains. We used synchronized cell cultures to determine how the mitotic chromosome conformation is transformed into the interphase state. Using Hi-C, chromatin binding assays, and immunofluorescence we show that by telophase condensin-mediated loops are lost and a transient ...
Gαi And Gɣ30a Act Downstream Of Tre1 In Drosophila Courtship, 2019 San Jose State University
Gαi And Gɣ30a Act Downstream Of Tre1 In Drosophila Courtship, Emily Mu
McNair Research Journal SJSU
The role of genes in morphological development is well understood for a variety of model organisms, but there remains a gap in our understanding of how genetics mediate behavior. Are there master genes that regulate behavior? Answering this question will lead to a better understanding of the development and function of the central nervous system, eventually allowing us to map out the pathways that regulate specific behaviors. We are using Drosophila melanogaster as a model organism and the male courtship ritual as the behavior of interest to study the relationships between genes, neural development, and behavior. Trapped in endoderm 1 ...
Insulin Signal Transduction Mediates Ethanol-Induced Feeding Dysfunction In A Fly Model Of Fetal Alcohol Spectrum Disorder, 2019 San Jose State University
Insulin Signal Transduction Mediates Ethanol-Induced Feeding Dysfunction In A Fly Model Of Fetal Alcohol Spectrum Disorder, Manae Matsubara
McNair Research Journal SJSU
Fetal alcohol spectrum disorder (FASD) is the leading cause of congenital intellectual disabilities in the Western World, with a worldwide prevalence of 2-11% of all births. FASD is preventable but recent epidemiological studies suggest that public awareness campaigns have reached the limits of their effectiveness. Therefore, research is shifting from prevention to treatment and mitigation of symptoms. No biological treatments for FASD exist, due in part to the fact the cellular mechanisms of alcohol toxicity are not well-understood. Developmental alcohol exposure (DAE) causes a variety of deleterious effects in both vertebrates and invertebrates, including increased mortality, slow growth, learning and ...
Trim5alpha Restricts Flavivirus Replication By Targeting The Viral Protease For Proteasomal Degradation, 2019 National Institute of Allergy and Infectious Diseases
Trim5alpha Restricts Flavivirus Replication By Targeting The Viral Protease For Proteasomal Degradation, Abhilash I. Chiramel, Nicholas R. Meyerson, Kristin L. Mcnally, Rebecca M. Broeckel, Vanessa R. Montoya, Omayra Mendez-Solis, Shelly J. Robertson, Gail L. Sturdevant, Kirk J. Lubick, Vinod Nair, Brian H. Youseff, Robin M. Ireland, Catharine M. Bosio, Kyusik Kim, Jeremy Luban, Vanessa M. Hirsch, R. Travis Taylor, Fadila Bouamr, Sara L. Sawyer, Sonja M. Best
Program in Molecular Medicine Publications and Presentations
Tripartite motif-containing protein 5alpha (TRIM5alpha) is a cellular antiviral restriction factor that prevents early events in retrovirus replication. The activity of TRIM5alpha is thought to be limited to retroviruses as a result of highly specific interactions with capsid lattices. In contrast to this current understanding, we show that both human and rhesus macaque TRIM5alpha suppress replication of specific flaviviruses. Multiple viruses in the tick-borne encephalitis complex are sensitive to TRIM5alpha-dependent restriction, but mosquito-borne flaviviruses, including yellow fever, dengue, and Zika viruses, are resistant. TRIM5alpha suppresses replication by binding to the viral protease NS2B/3 to promote its K48-linked ubiquitination and ...
Smooth Muscle Cell-Specific Tmem16a Deletion Does Not Alter Ca2+ Signaling, Uterine Contraction, Gestation Length Or Litter Size In Micedagger, 2019 University of Massachusetts Medical School
Smooth Muscle Cell-Specific Tmem16a Deletion Does Not Alter Ca2+ Signaling, Uterine Contraction, Gestation Length Or Litter Size In Micedagger, Mingzi Qu, Ping Lu, Karl D. Bellve, Kevin E. Fogarty, Lawrence M. Lifshitz, Fangxiong Shi, Ronghua Zhuge
Program in Molecular Medicine Publications and Presentations
Ion channels in myometrial cells play critical roles in spontaneous and agonist-induced uterine contraction during the menstrual cycle, pregnancy maintenance and parturition; thus identifying the genes of ion channels in these cells and determining their roles are essential to understanding the biology of reproduction. Previous studies with in vitro functional and pharmacological approaches have produced controversial results regarding the presence and role of TMEM16A Ca2+-activated Cl- channels in myometrial cells. To unambiguously determine the function of this channel in these cells, we employed a genetic approach by using smooth muscle cell-specific TMEM16A deletion (i.e. TMEM16ASMKO) mice. We found ...
Regulation Of The Drosophila Imd Pathway By Signaling Amyloids, 2019 Aarhus University
Regulation Of The Drosophila Imd Pathway By Signaling Amyloids, Anni Kleino, Neal S. Silverman
Fruit flies elicit effective defense responses against numerous microbes. The responses against Gram-negative bacteria are mediated by the Imd pathway, an evolutionarily conserved NF-kappaB pathway recognizing meso-diaminopimelic acid (DAP)-type peptidoglycan from bacterial cell walls. Several reviews already provide a detailed view of ligand recognition and signal transduction during Imd signaling, but the formation and regulation of the signaling complex immediately downstream of the peptidoglycan-sensing receptors is still elusive. In this review, we focus on the formation of the Imd amyloidal signaling center and post-translational modifications in the assembly and disassembly of the Imd signaling complex.
Yeast Sirtuin Family Members Maintain Transcription Homeostasis To Ensure Genome Stability, 2019 University of Massachusetts Medical School
Yeast Sirtuin Family Members Maintain Transcription Homeostasis To Ensure Genome Stability, Jessica L. Feldman, Craig L. Peterson
Program in Molecular Medicine Publications and Presentations
The mammalian sirtuin, SIRT6, is a key tumor suppressor that maintains genome stability and regulates transcription, though how SIRT6 family members control genome stability is unclear. Here, we use multiple genome-wide approaches to demonstrate that the yeast SIRT6 homologs, Hst3 and Hst4, prevent genome instability by tuning levels of both coding and noncoding transcription. While nascent RNAs are elevated in the absence of Hst3 and Hst4, a global impact on steady-state mRNAs is masked by the nuclear exosome, indicating that sirtuins and the exosome provide two levels of regulation to maintain transcription homeostasis. We find that, in the absence of ...
Nf-Κb In Biomphalaria Glabrata: A Genetic Fluke?, 2019 Lawrence University
Nf-Κb In Biomphalaria Glabrata: A Genetic Fluke?, Paige Stocker
Lawrence University Honors Projects
Biomphalaria glabrata is the intermediate host to the disease causing parasitic worm, Schistosoma mansoni. Previous work has identified homologs of NF-κB, a known immune related transcription factor, in B. glabrata and work has also been done to establish putative κB sites. It has also been observed that the p65 homologous subunit has an extended N-terminal region not present in other homologs. The goal of the present study is twofold: investigate DNA binding affinity of two NF-κB subunits, Bg-p65 and Bg-p50, and characterize the nature of the N-terminal extension of Bg-p65. In the current work, it is shown through the use ...
An Order-To-Disorder Structural Switch Activates The Foxm1 Transcription Factor, 2019 University of California, Santa Cruz
An Order-To-Disorder Structural Switch Activates The Foxm1 Transcription Factor, Aimee H. Marceau, Caileen M. Brison, Santrupti Nerli, Heather E. Arsenault, Andrew C. Mcshan, Eefei Chen, Hsiau-Wei Lee, Jennifer A. Benanti, Nikolaos G. Sgourakis, Seth M. Rubin
Open Access Articles
Intrinsically disordered transcription factor transactivation domains (TADs) function through structural plasticity, adopting ordered conformations when bound to transcriptional co-regulators. Many transcription factors contain a negative regulatory domain (NRD) that suppresses recruitment of transcriptional machinery through autoregulation of the TAD. We report the solution structure of an autoinhibited NRD-TAD complex within FoxM1, a critical activator of mitotic gene expression. We observe that while both the FoxM1 NRD and TAD are primarily intrinsically disordered domains, they associate and adopt a structured conformation. We identify how Plk1 and Cdk kinases cooperate to phosphorylate FoxM1, which releases the TAD into a disordered conformation that ...
Serum Deprivation Of Mesenchymal Stem Cells Improves Exosome Activity And Alters Lipid And Protein Composition, 2019 University of Massachusetts Medical School
Serum Deprivation Of Mesenchymal Stem Cells Improves Exosome Activity And Alters Lipid And Protein Composition, Reka A. Haraszti, Rachael Miller, Michelle L. Dubuke, Andrew H. Coles, Marie C. Didiot, Dimas Echeverria, Matteo Stoppato, Yves Y. Sere, John D. Leszyk, Julia F. Alterman, Bruno M. D. C. Godinho, Matthew R. Hassler, Rachel Wollacott, Yan Wang, Scott A. Shaffer, Neil Aronin, Anastasia Khvorova
Open Access Articles
Exosomes can serve as delivery vehicles for advanced therapeutics. The components necessary and sufficient to support exosomal delivery have not been established. Here we connect biochemical composition and activity of exosomes to optimize exosome-mediated delivery of small interfering RNAs (siRNAs). This information is used to create effective artificial exosomes. We show that serum-deprived mesenchymal stem cells produce exosomes up to 22-fold more effective at delivering siRNAs to neurons than exosomes derived from control cells. Proteinase treatment of exosomes stops siRNA transfer, indicating that surface proteins on exosomes are involved in trafficking. Proteomic and lipidomic analyses show that exosomes derived in ...
Extraction, Purification And Evaluation Of Prmt5-Inhibitory Phytochemical Compounds For The Treatment Of Prostate Adenocarcinoma, Oliver H. Richmond Iii
Electronic Theses & Dissertations Collection for Atlanta University & Clark Atlanta University
The development and advancement of prostate cancer is supported by a plethora of genetic and proteomic abnormalities, including events of post-translational modifications. The protein arginine methyltransferase 5 (PRMT5) enzyme regulates epigenetic events of histone modifications and protein post-translational modifications within protein signaling pathways. PRMT5 functions by catalyzing the symmetric dimethylation of terminal arginine residues on target protein substrates. Under abnormal conditions of overexpression and upregulation, PRMT5 methyltransferase activity constitutively drives the growth and proliferation of dysregulated cells. Overexpression or upregulation of PRMT5 correlates with disease progression as observed among numerous cancer types, including breast, colorectal, leukemia, lung, melanoma and prostate ...
The Role Of Fos And Junb In The Reprogramming Of Acute Myeloid Leukemia Cells, 2019 Dickinson College
The Role Of Fos And Junb In The Reprogramming Of Acute Myeloid Leukemia Cells, Kayla Bendinelli
Student Honors Theses By Year
Acute Myeloid Leukemia (AML) is the most common form of leukemia in adults and while it has a high remission rate, relapse with therapy resistance is common, indicating the need for more targeted and effective therapies. It is possible to reprogram AML cells in culture to undergo cell cycle arrest, differentiation into “normal” macrophage-like cells, and apoptosis using phorbol 12-myristate 13-acetate (PMA), a diacyl glycerol (DAG) mimic. While this is effective in “curing” leukemia in culture, PMA is too toxic to serve as a therapy in AML patients. During these PMA-induced changes, approximately 1250 genes change in expression. The goal ...
Kinetics Of Hiv-1 Uncoating In C20 Microglial Cells, 2019 Missouri State University
Kinetics Of Hiv-1 Uncoating In C20 Microglial Cells, Melanie Anne Taylor
MSU Graduate Theses
Uncoating is a poorly understood yet required step of HIV-1 replication that is defined as the disassembly of the viral capsid structure. The goal of this project is to characterize uncoating in C20 microglial cells. These cells are a natural target of HIV-1 that are infected to establish latent viral reservoirs and HIV-associated neurological disorders. A stable C20 cell line that expresses TRIM-CypA was established to study the kinetics of uncoating with the CsA washout assay. The expression of TRIM-CypA was confirmed by western blot and the functionality of the protein was confirmed by a viral infectivity assay. Using this ...
Further Characterization Of The Skeletal Phenotype In A Hurler Syndrome Mouse Model And The Ethical Treatment Of Children In Medicine, Anna Marie Mcwoods
MSU Graduate Theses
Mucopolysaccharidosis type I (MPS I) is a rare, autosomal recessive disorder caused by the deficiency of the lysosomal enzyme α-L-iduronidase (IDUA). Absence of IDUA results in the accumulation of dermatan and heparin sulfate and ultimately causes multi-system dysfunction. The most severe form of MPS I is Hurlers syndrome, a rapidly progressive disorder that, if left untreated, is fatal. Current treatment options for diagnosed individuals includes hematopoietic stem cell transplantation (HSCT) and enzyme replacement therapy (ERT). These treatments are able to ameliorate the majority of symptoms with the exception of the bone phenotype. This investigation aimed to further characterize the bone ...
Stochastic Modeling Of Neuronal Transport In Various Cellular Geometries, 2019 Rensselaer Polytechnic Institute
Stochastic Modeling Of Neuronal Transport In Various Cellular Geometries, Abhishek Choudhary Mr., Peter Kramer
Biology and Medicine Through Mathematics Conference
No abstract provided.
Bridging From Intramuscular To Limb Perfusion Delivery Of Raav: Optimization In A Non-Human Primate Study, 2019 University of Massachusetts Medical School
Bridging From Intramuscular To Limb Perfusion Delivery Of Raav: Optimization In A Non-Human Primate Study, Alisha Gruntman, Gwladys Gernoux, Qiushi Tang, Guo-Jie Ye, Dave R. Knop, Gensheng Wang, Janet Benson, Kristen E. Coleman, Allison M. Keeler, Christian Mueller, Louis G. Chicoine, Jeffrey D. Chulay, Terence R. Flotte
Phase 1 and phase 2 gene therapy trials using intramuscular (IM) administration of a recombinant adeno-associated virus serotype 1 (rAAV1) for replacement of serum alpha-1 antitrypsin (AAT) deficiency have shown long-term (5-year) stable transgene expression at approximately 2% to 3% of therapeutic levels, arguing for the long-term viability of this approach to gene replacement of secreted serum protein deficiencies. However, achieving these levels required 100 IM injections to deliver 135 mL of vector, and further dose escalation is limited by the scalability of direct IM injection. To further advance the dose escalation, we sought to bridge the rAAV-AAT clinical development ...
Subcellular-Level Resolution Maldi-Ms Imaging Of Maize Leaf Metabolites By Maldi-Linear Ion Trap-Orbitrap Mass Spectrometer, Andrew R. Korte, Marna D. Yandeau-Nelson, Basil J. Nikolau, Young-Jin Lee
A significant limiting factor in achieving high spatial resolution for matrix-assisted laser desorption ionization-mass spectrometry (MALDI-MS) imaging is the size of the laser spot at the sample surface. Here, we present modifications to the beam-delivery optics of a commercial MALDI-linear ion trap-Orbitrap instrument, incorporating an external Nd:YAG laser, beam-shaping optics, and an aspheric focusing lens, to reduce the minimum laser spot size from ~50 μm for the commercial configuration down to ~9 μm for the modified configuration. This improved system was applied for MALDI-MS imaging of cross sections of juvenile maize leaves at 5-μm spatial resolution using an oversampling ...
Role Of The Glycerophosphocholine Acyltransferase, Gpc1, In Phosphatidylcholine (Pc) Biosynthesis And Remodeling In Saccharomyces Cerevisiae, Sanket Anaokar
Electronic Theses and Dissertations
Biomembranes are permeable barriers that enclose the cell and the intracellular organelles in a cell. The selective nature of these robust barriers acts as the first line of defense towards the harsh factors that can compromise cell survival. Biomembranes primarily consist of membrane lipids that are organized into layers to form a dynamic bilayer structure. The dynamic nature of the membrane requires the synchronized modulation of lipid composition through de novo synthesis, degradation, intracellular movement, and remodeling. Phospholipids are the major membrane lipid class, and phosphatidylcholine (PC) is the most abundant phospholipid in most eukaryotic biomembranes.
PC is primarily produced ...