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Biochemistry, Biophysics, and Structural Biology Commons™
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Articles 1 - 30 of 39
Full-Text Articles in Biochemistry, Biophysics, and Structural Biology
The Impact Of Mutations In The Arabidopsis Apetela (Ap3) Gene, Hazel R. Frans, Tara Phelps-Durr
The Impact Of Mutations In The Arabidopsis Apetela (Ap3) Gene, Hazel R. Frans, Tara Phelps-Durr
SACAD: John Heinrichs Scholarly and Creative Activity Days
The purpose of this research is to understand the molecular functioning of the Arabidopsis thaliana Apetela (Ap3) gene. We created mutations in two sites of the gene, AP3-3 and AP3-5. These are predicted to change AP3 protein structure, which may result in a mutated flower. Analyzing the effects of new mutations allows an understanding of protein formation both in plants and humans.
Deep Learning Image Analysis To Isolate And Characterize Different Stages Of S-Phase In Human Cells, Kevin A. Boyd, Rudranil Mitra, John Santerre, Christopher L. Sansam
Deep Learning Image Analysis To Isolate And Characterize Different Stages Of S-Phase In Human Cells, Kevin A. Boyd, Rudranil Mitra, John Santerre, Christopher L. Sansam
SMU Data Science Review
Abstract. This research used deep learning for image analysis by isolating and characterizing distinct DNA replication patterns in human cells. By leveraging high-resolution microscopy images of multiple cells stained with 5-Ethynyl-2′-deoxyuridine (EdU), a replication marker, this analysis utilized Convolutional Neural Networks (CNNs) to perform image segmentation and to provide robust and reliable classification results. First multiple cells in a field of focus were identified using a pretrained CNN called Cellpose. After identifying the location of each cell in the image a python script was created to crop out each cell into individual .tif files. After careful annotation, a CNN was …
Therapies For Mitochondrial Disorders, Kayli Sousa Smyth, Anne Mulvihill
Therapies For Mitochondrial Disorders, Kayli Sousa Smyth, Anne Mulvihill
SURE Journal: Science Undergraduate Research Experience Journal
Mitochondria are cytoplasmic, double-membrane organelles that synthesise adenosine triphosphate (ATP). Mitochondria contain their own genome, mitochondrial DNA (mtDNA), which is maternally inherited from the oocyte. Mitochondrial proteins are encoded by either nuclear DNA (nDNA) or mtDNA, and both code for proteins forming the mitochondrial oxidative phosphorylation (OXPHOS) complexes of the respiratory chain. These complexes form a chain that allows the passage of electrons down the electron transport chain (ETC) through a proton motive force, creating ATP from adenosine diphosphate (ADP). This study aims to explore current and prospective therapies for mitochondrial disorders (MTDS). MTDS are clinical syndromes coupled with abnormalities …
Ngly1 Deficiency Affects Glycosaminoglycan Biosynthesis And Wnt Signaling Pathway In Mice, Amy Batten
Ngly1 Deficiency Affects Glycosaminoglycan Biosynthesis And Wnt Signaling Pathway In Mice, Amy Batten
PANDION: The Osprey Journal of Research and Ideas
Individuals affected by NGLY1 Deficiency cannot properly deglycosylate and recycle certain proteins. Even though less than 100 people worldwide have been diagnosed with this rare autosomal recessive condition, thousands are affected by similar glycosylation disorders. Common phenotypic manifestations of NGLY1 Deficiency include severe neural and intellectual delay, impaired muscle and liver function, and seizures that may become intractable. Very little is currently known about the various mechanisms through which NGLY1 deficiency affects the body and this has led to a lack of viable treatment options for those afflicted. This experiment uses a loss-of-function (LOF) mouse model of NGLY1 Deficiency homologous …
Du Undergraduate Showcase: Research, Scholarship, And Creative Works: Abstracts, Emma Aggeler, Elena Arroway, Daisy T. Booker, Justin Bravo, Kyle Bucholtz, Megan Burnham, Nicole Choi, Spencer Cockerell, Rosie Contino, Jackson Garske, Kaitlyn Glover, Caroline Hamilton, Haley Hartmann, Madalyne Heiken, Colin Holter, Leah Huzjak, Alyssa Jeng, Cole Jernigan, Chad Kashiwa, Adelaide Kerenick, Emily King, Abigail Langeberg, Maddie Leake, Meredith Lemons, Alec Mackay, Greer Mckinley, Ori Miller, Guy Milliman, Katherine Miromonti, Audrey Mitchell, Lauren Moak, Megan Morrell, Gelella Nebiyu, Zdenek Otruba, Toni V. Panzera, Kassidy Patarino, Sneha Patil, Alexandra Penney, Kevin Persky, Caitlin Pham, Gabriela Recinos, Mary Ringgenberg, Chase Routt, Olivia Schneider, Roman Shrestha, Arlo Simmerman, Alec Smith, Tessa Smith, Nhi-Lac Thai, Kyle Thurmann, Casey Tindall, Amelia Trembath, Maria Trubetskaya, Zachary Vangelisti, Peter Vo, Abby Walker, David Winter, Grayden Wolfe, Leah York
Du Undergraduate Showcase: Research, Scholarship, And Creative Works: Abstracts, Emma Aggeler, Elena Arroway, Daisy T. Booker, Justin Bravo, Kyle Bucholtz, Megan Burnham, Nicole Choi, Spencer Cockerell, Rosie Contino, Jackson Garske, Kaitlyn Glover, Caroline Hamilton, Haley Hartmann, Madalyne Heiken, Colin Holter, Leah Huzjak, Alyssa Jeng, Cole Jernigan, Chad Kashiwa, Adelaide Kerenick, Emily King, Abigail Langeberg, Maddie Leake, Meredith Lemons, Alec Mackay, Greer Mckinley, Ori Miller, Guy Milliman, Katherine Miromonti, Audrey Mitchell, Lauren Moak, Megan Morrell, Gelella Nebiyu, Zdenek Otruba, Toni V. Panzera, Kassidy Patarino, Sneha Patil, Alexandra Penney, Kevin Persky, Caitlin Pham, Gabriela Recinos, Mary Ringgenberg, Chase Routt, Olivia Schneider, Roman Shrestha, Arlo Simmerman, Alec Smith, Tessa Smith, Nhi-Lac Thai, Kyle Thurmann, Casey Tindall, Amelia Trembath, Maria Trubetskaya, Zachary Vangelisti, Peter Vo, Abby Walker, David Winter, Grayden Wolfe, Leah York
DU Undergraduate Research Journal Archive
Abstracts from the DU Undergraduate Showcase.
Effect Of Rehmannia Glutinosa Libosch Extract On Proliferation And Cardiogenic Pre-Differentiation Of Human Mesenchymal Stem Cells, Huu Dat Nguyen, Len Ho Thi, Xuan Bach Ho, Van Anh Cao, Duy Minh Le Hoang
Effect Of Rehmannia Glutinosa Libosch Extract On Proliferation And Cardiogenic Pre-Differentiation Of Human Mesenchymal Stem Cells, Huu Dat Nguyen, Len Ho Thi, Xuan Bach Ho, Van Anh Cao, Duy Minh Le Hoang
BioMedicine
Background: Vietnamese medicine tried and tested certain bioactive compounds from plants to increase the rate of tissue immunomodulation, regeneration, and differentiation. Although there are many research papers discovered about phytochemicals of Rehmannia glutinosa Libosch and differentiation induction potential of some substances purified from this herbal, it finds difficult to seek research that investigated the effect of Rehmannia glutinosa Libosch extract on proliferation and cardiogenic differentiation of mesenchymal stem cells, even though it has commonly been used for a long time because of its function as a restorative and as a critical role in cardiovascular treatment in traditional.
Results: Our …
Investigating Factors That Affect Hiv-1 Capsid Stability, Max Mao, Joshua Temple
Investigating Factors That Affect Hiv-1 Capsid Stability, Max Mao, Joshua Temple
The Yale Undergraduate Research Journal
TKH HIV caSVLd, a SURWHLQ VKHOO cRPSRVHd RI PRQRPHULc XQLWV RI CA, IRUPV a IXOOHUHQH cRQH WKaW SURWHcWV HIV¶V YLUaO JHQRPH aQd enzymes during infection. I am interested in elucidating the factors that influence stability of the capsid shell and capturing the structural interactions between HIV capsid, host restriction factors, and small molecules using biochemical and structural biology techniques. HIV capsid shell was broken down and purified into hexamer and pentamer units for in vitro study. Structural assays were performed using X-ray crystallography and biochemical analysis was performed using pelleting assays. By understanding capsid structure with factors that confer stability, …
Altering Sensory Learning By Chronic Inactivation Of Vip Interneurons, Christopher Alba, Hannah Selwyn, Katie Ferguson, Jessica Cardin
Altering Sensory Learning By Chronic Inactivation Of Vip Interneurons, Christopher Alba, Hannah Selwyn, Katie Ferguson, Jessica Cardin
The Yale Undergraduate Research Journal
Vasoactive intestinal polypeptide-expressing interneurons (VIP-INs) play a key role in the regulation of cortical circuits and are implicated in perceptual function and psychiatric disease. However, their role in perceptual augmentation and learning remains understudied. We performed chronic, localized ablation of VIP-INs in the primary visual cortex of adult mice using caspase-induced apoptosis to better understand how VIP-INs contribute to visual perception and the ability to learn a visual detection task. We find that chronic VIP-IN ablation does not affect naïve performance on a full-screen visual contrast detection task. However, mice with suppressed levels of VIP-INs achieved their final expert state …
A Mechanistic Study On The Non-Genotoxic Carcinogenicity Of The Food Contaminant Semicarbazide, Daniel P. Fitzpatrick
A Mechanistic Study On The Non-Genotoxic Carcinogenicity Of The Food Contaminant Semicarbazide, Daniel P. Fitzpatrick
SURE Journal: Science Undergraduate Research Experience Journal
Semicarbazide was brought to the forefront of scientific discussions by the scientific community in the early 2000’s as the substance was discovered in several food products from both synthetic and natural sources. Although semicarbazide was processed through several toxicological assays and classified as a non-genotoxic carcinogen, underwhelming amounts of toxicological data exists for the compound. The present study is one of the first in-vitro studies to examine the relationship between sub-pathophysiological concentrations of reactive oxygen species and the anomalous non-genotoxic carcinogenicity induced by semicarbazide through the upregulation of intracellular signalling pathways. A novel finding of the present study was where …
Analyzing The Effect On Ligand Sensitivity For Xenopus Tropicalis Mc1r, Mc3r, Mc4r, And Mc5r As A Result Of Coexpression With Gallus Gallus Mrap1 In Chinese Hamster Ovary Cells, Avery Niemann, Robert Dores
Analyzing The Effect On Ligand Sensitivity For Xenopus Tropicalis Mc1r, Mc3r, Mc4r, And Mc5r As A Result Of Coexpression With Gallus Gallus Mrap1 In Chinese Hamster Ovary Cells, Avery Niemann, Robert Dores
DU Undergraduate Research Journal Archive
Some melanocortin receptors and the accessory protein MRAP1 have been found to interact in novel ways when co-expressed in the same cells following stimulation with either ACTH (1-24) or αMSH. These interactions have been seen for mammalian, bird, and some bony fish melanocortin receptors. Such analysis has not been done yet on the amphibian melanocortin receptors, MC1R, MC3R, MC4R, and MC5R. To this end, this study was done on the effects regarding ligand sensitivity for ACTH (1-24) and αMSH, when the MC1R, MC3R, MC4R, and MC5R paralogs of the amphibian, Xenopus tropicalis were expressed in Chinese Hamster Ovary cells either …
How Cellular Metabolic State And The Chaperone Protein Hsp104 Interact To Affect The Spontaneous Formation Of The Yeast Prion [Ure3], Demyia Graham
How Cellular Metabolic State And The Chaperone Protein Hsp104 Interact To Affect The Spontaneous Formation Of The Yeast Prion [Ure3], Demyia Graham
Merge
No abstract provided.
Immediate-Early Genes And Delayed Primary Response Genes Regulated By Nmu In Skbr3 Her-2 Positive Breast Cancer Cell Line, Jessica Murphy, Sweta Rani
Immediate-Early Genes And Delayed Primary Response Genes Regulated By Nmu In Skbr3 Her-2 Positive Breast Cancer Cell Line, Jessica Murphy, Sweta Rani
SURE Journal: Science Undergraduate Research Experience Journal
Background
Breast cancer is a heterogeneous disease that consists of varying genetic, cellular and molecular subtypes with unique characteristics. Due to the multiple subtypes and molecular markers of breast cancer, successful clinical treatment is hampered by the lack of reliable biomarkers. HER2-positive breast cancer is an aggressive subtype associated with poor patient prognosis. Although survival rates have dramatically increased due to the development of Trastuzumab in 1997, many patients develop a resistance to this therapeutic treatment and relapse over time. Rani et al. (2014), have associated the acquirement of resistance to HER2-treatment with Neuromedin U, but the mechanisms by …
Insulin Signal Transduction Mediates Ethanol-Induced Feeding Dysfunction In A Fly Model Of Fetal Alcohol Spectrum Disorder, Manae Matsubara
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 …
Killi-Data News (Winter), Tyrone Genade
Killi-Data News (Winter), Tyrone Genade
Killifish Research Review
Valued readers, it is with a heavy heart that I inform you that this is the last issue of Killi-Data News. The good news is that we will be back as Killifish Research Review. The dissolution of Killi-Data International created a prob- lem: how can the newsletter of a defunct organization live on without that organization? But other additional problems were building in the background. The first issue numbered 15 pages. The previous issue was 28 pages. The number of killifish related papers is increasing while time on our end (the editorial team) is running out. It takes a lot …
Killi-Data News (Fall), Tyrone Genade
Killi-Data News (Fall), Tyrone Genade
Killifish Research Review
Many interesting papers have been published over the last three months. The large volume of papers coupled with the start of the new college semester (and the workload it brings) delayed this issue of Killi-Data News. But better late than never—or so I hope! In this issue Richard van der Laan provides an insightful review of the recent Aphanius papers as to their taxonomic implications and questions. The systematic issues he raises show the importance of the Molecular project: we need to get more samples of the various cyprinodontiforme families to resolve unsettled systematic and taxonomic issues. In the Next …
Killi-Data News (Summer), Tyrone Genade
Killi-Data News (Summer), Tyrone Genade
Killifish Research Review
Over the last three months several interesting and exciting pa- pers have been published. By now most of you have heard the Nothobranchius fish poo news emanating from the Valenzano lab. That paper is reviewed and certainly has repercussions for the health of our captive fish. Polaçik et al have published interesting data with ramifications as to how we breed and incubate annual killifish. The big news in this issue is the paper from the Reznick lab which Jean Huber reviews. The contents of that paper goes to the heart of the question of just what a killifish is. The …
Killi-Data News (Spring), Tyrone Genade
Killi-Data News (Spring), Tyrone Genade
Killifish Research Review
This is the start of Killi-Data News’ second year. In this first issue of the year we have the usual review of research pub- lications as well as input from Martin Reichard on his lab’s Nothobranchius research. Martin is responding to my reviews of his lab’s work in the previous edition. I am serious about making sure the content in this newsletter is reliable but I erred in the previous edition and Martin has written extensively to correct my mistake in the section “Erratum”. This reply is welcomed and owed to readers. I must confess that I don’t know everything …
Killi-Data News (Winter), Tyrone Genade
Killi-Data News (Winter), Tyrone Genade
Killifish Research Review
This is the fourth edition, and concluding issue of the first volume, of Killi-Data News and I am happy that it has been well received by readers. At 25 pages this issue is a bit thin- ner than the last but this is because we agreed to make the cut-off for submissions the 1 st of December so we could get this edition out by the New Year. This is an exciting edition full of new species descrip- tions and analyses that will keep taxonomists busy for years to come. Costa has given us two molecular phylogenies on Melanorivulus as …
Killi-Data News (Spring), Tyrone Genade
Killi-Data News (Spring), Tyrone Genade
Killifish Research Review
This is the start of Killi-Data News’ second year. In this first issue of the year we have the usual review of research pub- lications as well as input from Martin Reichard on his lab’s Nothobranchius research. Martin is responding to my reviews of his lab’s work in the previous edition. I am serious about making sure the content in this newsletter is reliable but I erred in the previous edition and Martin has written extensively to correct my mistake in the section “Erratum”. This reply is welcomed and owed to readers. I must confess that I don’t know everything …
Microstructure Of Attachment Mechanisms Of Newly Hatched Larvae Of Four Cyprinid Species With Comments On Terminology, George E. Maurakis, Eugene G. Maurakis
Microstructure Of Attachment Mechanisms Of Newly Hatched Larvae Of Four Cyprinid Species With Comments On Terminology, George E. Maurakis, Eugene G. Maurakis
Virginia Journal of Science
An adhesive organ is a prominent, protruding mucus secreting gland that is used by newly hatched tadpoles and larvae of some fishes to attach to aquatic vegetation. The objective of this research is to test the hypothesis that newly hatched cyprinid larvae of Hybognathus hankinsoni, Notemigonus crysoleucas, Cyprinus carpio and Gila atraria contain cephalic adhesive organs. Newly hatched larvae of Semotilus atromaculatus, which do not attach to submerged aquatic vegetation, were used as the control. SEM examination of newly hatched larvae indicate there were no adhesive organs on the control species (S. atromaculatus) or test species …
Characterization Of Different Molecular Markers For Identification Of Salmonella Enterica Serovar Typhi In Pakistani Population, Faizan Muttiullah, Fida Muhammad Khan, Fakhar-I- Abbas, Sabiha Shamim
Characterization Of Different Molecular Markers For Identification Of Salmonella Enterica Serovar Typhi In Pakistani Population, Faizan Muttiullah, Fida Muhammad Khan, Fakhar-I- Abbas, Sabiha Shamim
Journal of Bioresource Management
Typhoid is caused by Salmonella enterica serovar Typhi that is usually diagnosed by using serologic and immuno-chromatographic techniques in developing counties including Pakistan, which is thought to be an unreliable diagnostic method. For accurate diagnosis we used molecular techniques to amplify 204 bp StyR-36 and 498 bp flagellin gene for the identification of Salmonella enterica serovar Typhi. This study was done on 58 individuals diagnosed positive of typhoid via serologic tests and 50 healthy individuals as a control group. Success rate of amplification for flagellin gene was 77.58% while that for StyR-36 gene was 68.97% showing that flagellin gene primer …
The General Amino Acid Permease Gap1 Is Regulated Differentially By Torc1 Activation And Inhibition, Ray Bowman
The General Amino Acid Permease Gap1 Is Regulated Differentially By Torc1 Activation And Inhibition, Ray Bowman
D.U.Quark
How does cell signaling in response to extracellular stressors impact the trafficking of membrane proteins? In particular, the TORC1 complex plays a key role in this process and while some details of this system have reported, in a recent Journal of Biological Chemistry publication, Andre’s group has revealed new details of this pathway focusing on the general amino acid permease Gap1 as a model cargo. Andre et al. describe a novel and distinct pathway wherein ubiquitylation and downregulation of Gap1 is regulated not only by amino acid-induced activation of TORC1, but also by numerous sources of TORC1 inhibition and cellular …
Spatiotemporal Regulation Of Atg1 Kinase Activation In Selective Autophagy, Ning Sun
Spatiotemporal Regulation Of Atg1 Kinase Activation In Selective Autophagy, Ning Sun
D.U.Quark
Autophagy is a potent intracellular degradation system and thus its activation requires exquisite regulation to maintain cellular homeostasis. Atg1, a serine-threonine protein kinase, is essential in both selective and non-selective autophagy. New findings suggest that in selective autophagy, Atg1 is activated at the vacuole by convergence of two independent recruitment pathways to prevent aberrant autophagy induction.
Autophagy Inhibition In Pain: Role Of A Microrna, Andrea Stevens
Autophagy Inhibition In Pain: Role Of A Microrna, Andrea Stevens
D.U.Quark
Neuropathic pain caused by peripheral nerve injury (PNI) leads to the activation and infiltration of microglial cells and to a neuroinflammatory-induced pain state. miRNAs and autophagy are two main factors and/or mechanisms which have the ability to alter the pain state. In this study, miR-195 was shown to be markedly increased after PNI and associated with the pain phenotype. In addition, inhibition of autophagy in vivo led to p62 accumulation, decreased production of LC3, and inhibition of ATG14.
Hsp70 Conformational Plasticity Allows For Expansive Chaperone Role, Megan Bean
Hsp70 Conformational Plasticity Allows For Expansive Chaperone Role, Megan Bean
D.U.Quark
The Hsp70 system is an essential component of chaperone activity in many organisms. Hsp70 functions include: protein folding, aggregation prevention, trafficking, and enzyme regulation. Hsp70’s ability to bind such a vast array of substrates suggests wide range of conformational plasticity. By utilizing a single mode optical tweezers technique, Mashaghi1 et al., confirms previous theories Hsp70 binds and stabilizes extended peptide segments but also partially folded and near-native protein.
Plasmodium Falciparum 26s Proteasome Network: A Mystery Solved, Christina Grogan
Plasmodium Falciparum 26s Proteasome Network: A Mystery Solved, Christina Grogan
D.U.Quark
One ofthe most devastating diseases thatthreatens the world population is malaria. The 26S proteasome complex of the malaria parasite Plasmodium falciparum, which was previously unknown, was characterized by the authors through an affinity purification protocol that isolated functional 26S proteasome complexes. This allowed for the identification of subunit composition and PfUSP14, a proteasomeassociated deubiquitinase. This new understanding presents a potential target to disrupt protein regulation in thequest for effective antimalarial strategies.
Modeling And Analysis Of Germ Layer Formations Using Finite Dynamical Systems, Alexander Garza, Megan Eberle, Eric A. Eager
Modeling And Analysis Of Germ Layer Formations Using Finite Dynamical Systems, Alexander Garza, Megan Eberle, Eric A. Eager
Spora: A Journal of Biomathematics
The development of an embryo from a fertilised egg to a multicellular organism proceeds through numerous steps, with the formation of the three germ layers (endoderm, mesoderm, ectoderm) being one of the first. In this paper we study the mesendoderm (the tissue that collectively gives rise to both mesoderm and endoderm) gene regulatory network for two species, \textit{Xenopus laevis} and the axolotl (\textit{Ambystoma mexicanum}) using Boolean networks. We find that previously-established bistability found in these networks can be reproduced using this Boolean framework, provided that some assumptions used in previously-published differential equations models are relaxed. We conclude by discussing our …
Poster: Embryonic Stem Cell Research, Emillie Partridge
Poster: Embryonic Stem Cell Research, Emillie Partridge
Best Integrated Writing
This poster presentation by Partridge provides information about stem cell research and the controversy surrounding it.
The Generation, Exploitation And Future Of Induced Pluripotent Stem Cells, Jacob Steenwyk
The Generation, Exploitation And Future Of Induced Pluripotent Stem Cells, Jacob Steenwyk
Scholarly Undergraduate Research Journal at Clark (SURJ)
The foundational advancements of John Gurdon and Shinya Yamanaka have improved understanding of dedifferen- tiation of cells to a pluripotent state. The seminal discovery established a novel system to study disease pathogenesis, drug screening, and toxicity, as well as sprouted the new field of regenerative medicine. In this article, the method- ology to obtain dedifferentiated cells, known as induced pluripotent stem (iPS) cells, subsequent validation, and application of which are reviewed. The experiments investigated here aim to demonstrate the capacity of iPS cells to replace the ethically-gray human embryonic cells by developing human livers and viable, healthy animals. It is …
Reactive Oxygen Species-Mediated Neurodegeneration Is Independent Of The Ryanodine Receptor In Caenorhabditis Elegans, Lyndsay E.A. Young, Daniel C. Williams
Reactive Oxygen Species-Mediated Neurodegeneration Is Independent Of The Ryanodine Receptor In Caenorhabditis Elegans, Lyndsay E.A. Young, Daniel C. Williams
Journal of the South Carolina Academy of Science
Despite the significant impacts on human health caused by neurodegeneration, our understanding of the degeneration process is incomplete. The nematode Caenorhabditis elegans is emerging as a genetic model organism well suited for identification of conserved cellular mechanisms and molecular pathways of neurodegeneration. Studies in the worm have identified factors that contribute to neurodegeneration, including excitotoxicity and stress due to reactive oxygen species (ROS). Disruption of the gene unc-68, which encodes the ryanodine receptor, abolishes excitotoxic cell death, indicating a role for calcium (Ca2+) signaling in neurodegeneration. We tested the requirement for unc-68 in ROS-mediated neurodegeneration using the …