Down Syndrome RFI Responses Combined
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Dynamics of Plasma Biomarkers in Down Syndrome: the Relative Levels of Aβ42 Decrease with Age, Whereas NT1 Tau and Nfl Increase
Dynamics of plasma biomarkers in Down syndrome: the relative levels of Aβ42 decrease with age, whereas NT1 tau and NfL increase David Mengel University of Tuebingen Wen Liu Brigham and Women's Hospital Robert J. Glynn Brigham and Women's Hospital Dennis J. Selkoe Brigham and Women's Hospital Andre Strydom King's College London Florence Lai Massachusetts General Hospital H. Diana Rosas Massachusetts General Hospital Amy Torres Massachusetts General Hospital Vasiliki Patsiogiannis Massachusetts General Hospital Brian Skotko Massachusetts General Hospital Dominic Walsh ( [email protected] ) Brigham and Women's Hospital and Harvard Medical School Research Keywords: Alzheimer’s disease, amyloid, Down syndrome, dementia, neurolament light, Simoa Posted Date: January 29th, 2020 DOI: https://doi.org/10.21203/rs.2.18106/v2 Page 1/23 License: This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License Version of Record: A version of this preprint was published at Alzheimer's Research and Therapy on March 19th, 2020. See the published version at https://doi.org/10.1186/s13195-020-00593-7. Page 2/23 Abstract Background Down syndrome (DS) is the most common genetic cause of Alzheimer’s Disease (AD), but diagnosis of AD in DS is challenging due to the intellectual disability which accompanies DS. When disease-modifying agents for AD are approved, reliable biomarkers will be required to identify when and how long people with DS should undergo treatment. Three cardinal neuropathological features characterize AD, and AD in DS – Aβ amyloid plaques, tau neurobrillary tangles, and neuronal loss. Here, we quantied plasma biomarkers of all 3 neuropathological features in a large cohort of people with DS aged from 3 months to 68 years. -
Modelling Down Syndrome
UPDATES GENetICS AND COGNITIVE NeuROSCIENCE Modelling Down syndrome Frank Buckley Animal models are extensively used in genetics, neuroscience and biomedical research. Recent studies illustrate the usefulness and the challenges of research utilising genetically engineered mice to explore the developmental biology of Down syndrome. These studies highlight many of the issues at the centre of what we understand about Down syndrome, and may one day point to useful ways to improve quality of life for people living with Down syndrome. All people diagnosed with Down syn- drome have an extra copy of at least part of chromosome 21 in at least some of their cells. Most have a complete additional copy of chromosome 21 in every cell (BOX 1). These extra copies of genes, present from the point of conception, begin a complex cascade of consequences that depend (among other things) on the addi- tional genes from chromosome 21, other genes on other chromosomes, anatomical location, developmental progress and the environment. The precise details of how these processes work and interact are not clearly understood. Such questions lie at the heart of modern genetics and cogni- tive neuroscience research. Complex systems The organism of choice for much of modern biomedical research is The molecular biology of just a single cell the mouse. Several genetically engineered strains have been made to is complicated (FIGURE 1) and modelling complex systems is difficult[1,2]. Describing study the biology of Down syndrome. how disruptions in gene ‘doses’ at the cel- lular level in people with Down syndrome Box 1 | The genetics of Down syndrome contribute to (for example) particular dif- ficulties in verbal short-term memory[3] or Approximately 95% of people with Down syndrome have an additional copy of comparatively slower progress in language a whole chromosome 21 in every cell [4] development than reading development (trisomy 21). -
Evaluation of Antioxidant Activity in the Erythrocytes in Patients with Down Syndrome
PRACA ORYGINALNA/ORIGINAL ARTICLE Evaluation of antioxidant activity in the erythrocytes in patients with Down syndrome Ocena aktywności antyoksydacyjnej w erytocytach u pacjentów z zespołem Downa Magdalena Cholewa, Joanna Śmigielska-Kuzia, Krzysztof Sendrowski, Beata Olchowik, Anna Jakubiuk-Tomaszuk, Marta Nędzi Klinika Neurologii i Rehabilitacji Dziecięcej Uniwersytetu Medycznego w Białymstoku, STRESZCZENIE ABSTRACT Celem pracy byla ocena aktywności enzymów antyoksyda- The aim of this study was to evaluate the activity of antioxi- cyjnch: dysmutazy ponadtlenkowej (SOD), peroksydazy glu- dant enzymes: superoxide dismutase (SOD), glutathione per- tationowej (GSH-Px), reduktazy glutationowej (GSSG-R) oraz oxidase (GSH-Px), glutathione reductase (GSSG-R) and serum stężenia dialdehydu malonowego (MDA) w erytrocytach osób malondialdehyde (MDA) levels in the erythrocytes in patients z zespołem Downa (ZD). Materiał i metody. Badaniem objęto with Down syndrome (DS). Materials and methods. The study grupę 66 pacjentów (24 dzieci i 42 dorosłych )z trisomią 21 pary included 66 patients (24 children and 42 adults) with Trisomy chromosomów. Grupę kontrolną stanowiło 59 osób zdrowych 21. The control group consisted of 59 healthy individuals (24 (24 dzieci i 35 dorosłych). Aktywność SOD, GSH-Px, GSSG-R children and 35 adults). The activity of SOD, GSH-Px, GSSG-R oraz stężenie MDA w erytrocytach oznaczono metodami spek- and MDA levels in erythrocytes were determined spectro- trofotometrycznymi. Wyniki. Wykazano wyższą aktywność photometrically. Results. We found a greater activity, which enzymów antyoksydacyjnych: SOD, GSH-Px, GSSG-R u osób decreased with age, of antioxidant enzymes: SOD, GSH-Px, z ZD w porównaniu do grupy kontrolnej, która malała wraz GSSG-R in patients with DS compared with the control group. -
Supplementary Data
SUPPLEMENTARY DATA A cyclin D1-dependent transcriptional program predicts clinical outcome in mantle cell lymphoma Santiago Demajo et al. 1 SUPPLEMENTARY DATA INDEX Supplementary Methods p. 3 Supplementary References p. 8 Supplementary Tables (S1 to S5) p. 9 Supplementary Figures (S1 to S15) p. 17 2 SUPPLEMENTARY METHODS Western blot, immunoprecipitation, and qRT-PCR Western blot (WB) analysis was performed as previously described (1), using cyclin D1 (Santa Cruz Biotechnology, sc-753, RRID:AB_2070433) and tubulin (Sigma-Aldrich, T5168, RRID:AB_477579) antibodies. Co-immunoprecipitation assays were performed as described before (2), using cyclin D1 antibody (Santa Cruz Biotechnology, sc-8396, RRID:AB_627344) or control IgG (Santa Cruz Biotechnology, sc-2025, RRID:AB_737182) followed by protein G- magnetic beads (Invitrogen) incubation and elution with Glycine 100mM pH=2.5. Co-IP experiments were performed within five weeks after cell thawing. Cyclin D1 (Santa Cruz Biotechnology, sc-753), E2F4 (Bethyl, A302-134A, RRID:AB_1720353), FOXM1 (Santa Cruz Biotechnology, sc-502, RRID:AB_631523), and CBP (Santa Cruz Biotechnology, sc-7300, RRID:AB_626817) antibodies were used for WB detection. In figure 1A and supplementary figure S2A, the same blot was probed with cyclin D1 and tubulin antibodies by cutting the membrane. In figure 2H, cyclin D1 and CBP blots correspond to the same membrane while E2F4 and FOXM1 blots correspond to an independent membrane. Image acquisition was performed with ImageQuant LAS 4000 mini (GE Healthcare). Image processing and quantification were performed with Multi Gauge software (Fujifilm). For qRT-PCR analysis, cDNA was generated from 1 µg RNA with qScript cDNA Synthesis kit (Quantabio). qRT–PCR reaction was performed using SYBR green (Roche). -
Phenotypes and Endotypes of Uncontrolled Severe Asthma
Phenotypes and New Treatments for Severe Asthma REVIEWS Phenotypes and Endotypes of Uncontrolled Severe Asthma: New Treatments P Campo,1 F Rodríguez,2 S Sánchez-García,3 P Barranco,4 S Quirce,4 C Pérez- Francés,5 E Gómez-Torrijos,6 R Cárdenas,6 JM Olaguibel,7 J Delgado8 Severe Asthma Workgroup of the SEAIC Asthma Committee 1UGC Allergy, Hospital General de Málaga, Málaga, Spain 2Department of Allergy, Hospital Universitario Marqués de Valdecilla, Santander, Spain 3Allergy Section, Hospital Infantil Universitario Niño Jesús, Madrid, Spain 4Department of Allergy, Hospital La Paz Institute for Health Research (IdiPAZ), Madrid, Spain 5Department of Allergy, Hospital Universitario Dr. Peset, Valencia, Spain 6Department of Allergy, Hospital General Universitario de Ciudad Real, Ciudad Real, Spain 7Department of Allergy, Complejo Hospitalario de Navarra, Pamplona, Spain 8UGC Allergy, Hospital Universitario Virgen Macarena, Sevilla, Spain ■ Abstract Severe asthma is a heterogeneous disease that affects only 5%-10% of asthmatic patients, although it accounts for a signifi cant percentage of the consumption of health care resources. Severe asthma is characterized by the need for treatment with high doses of inhaled corticosteroids and includes several clinical and pathophysiological phenotypes. To a large extent, this heterogeneity restricts characterization of the disease and, in most cases, hinders the selection of appropriate treatment. In recent years, therefore, emphasis has been placed on improving our understanding of the various phenotypes of severe asthma and the identifi cation of biomarkers for each of these phenotypes. Likewise, the concept of the endotype has been gaining acceptance with regard to the various subtypes of the disease, which are classifi ed according to their unique functional or pathophysiological mechanism. -
Strengthening Families Together 3Rd Edition Strengthening Families Together 3Rd Edition
Strengthening Families Together 3rd Edition Strengthening Families Together 3rd Edition Helping Canadians Live with Mental Illness The Schizophrenia Society of Canada is interested in hearing from you. If you find this resource helpful, or if you have any suggestions or questions, please let us know. E-mail messages can be sent to [email protected], or phone 905.415.2007. Production of the original materials for Strengthening Families Together was made possible by an educational grant from AstraZeneca Canada Inc. The Early Intervention adaptation was made possible by a grant from the Crabtree Foundation and Eli Lilly Canada. The views expressed herein do not necessarily reflect those of AstraZeneca Canada Inc., the Crabtree Foundation or Eli Lilly Canada. Copyright © 2008 Schizophrenia Society of Canada Revised and updated 2008 All rights reserved. The use of any part of this publication reproduced, transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, or stored in a retrieval system, without prior written consent of the publisher, is an infringement of the copyright law. Editing: Edna Barker Design: Hansen Design 1 Strengthening Families Together: 3rd Edition Helping Canadians Live with Mental Illness | handout Acknowledgements Production of the original Strengthening Families Together program (SFT) was made possible by a series of grants from AstraZeneca Canada Inc. The hard work of a number of people at the British Columbia Schizophrenia Society, including Ms. Nicole Chovil, Director of Education, and Gary Glacken, Executive Director, was instrumental in developing the original Strengthening Families Together program. This edition, designed to meet the needs of a range of families, including those who are newer to psychotic illness, was made possible by a grant from the Crabtree Foundation and Eli Lilly Canada. -
Chromosome 21 Leading Edge Gene Set
Chromosome 21 Leading Edge Gene Set Genes from chr21q22 that are part of the GSEA leading edge set identifying differences between trisomic and euploid samples. Multiple probe set IDs corresponding to a single gene symbol are combined as part of the GSEA analysis. Gene Symbol Probe Set IDs Gene Title 203865_s_at, 207999_s_at, 209979_at, adenosine deaminase, RNA-specific, B1 ADARB1 234539_at, 234799_at (RED1 homolog rat) UDP-Gal:betaGlcNAc beta 1,3- B3GALT5 206947_at galactosyltransferase, polypeptide 5 BACE2 217867_x_at, 222446_s_at beta-site APP-cleaving enzyme 2 1553227_s_at, 214820_at, 219280_at, 225446_at, 231860_at, 231960_at, bromodomain and WD repeat domain BRWD1 244622_at containing 1 C21orf121 240809_at chromosome 21 open reading frame 121 C21orf130 240068_at chromosome 21 open reading frame 130 C21orf22 1560881_a_at chromosome 21 open reading frame 22 C21orf29 1552570_at, 1555048_at_at, 1555049_at chromosome 21 open reading frame 29 C21orf33 202217_at, 210667_s_at chromosome 21 open reading frame 33 C21orf45 219004_s_at, 228597_at, 229671_s_at chromosome 21 open reading frame 45 C21orf51 1554430_at, 1554432_x_at, 228239_at chromosome 21 open reading frame 51 C21orf56 223360_at chromosome 21 open reading frame 56 C21orf59 218123_at, 244369_at chromosome 21 open reading frame 59 C21orf66 1555125_at, 218515_at, 221158_at chromosome 21 open reading frame 66 C21orf7 221211_s_at chromosome 21 open reading frame 7 C21orf77 220826_at chromosome 21 open reading frame 77 C21orf84 239968_at, 240589_at chromosome 21 open reading frame 84 -
S41598-021-85062-3.Pdf
www.nature.com/scientificreports OPEN Genetic dissection of down syndrome‑associated alterations in APP/amyloid‑β biology using mouse models Justin L. Tosh1,2, Elena R. Rhymes1, Paige Mumford3, Heather T. Whittaker1, Laura J. Pulford1, Sue J. Noy1, Karen Cleverley1, LonDownS Consortium*, Matthew C. Walker4, Victor L. J. Tybulewicz2,5, Rob C. Wykes4,6, Elizabeth M. C. Fisher1* & Frances K. Wiseman3* Individuals who have Down syndrome (caused by trisomy of chromosome 21), have a greatly elevated risk of early‑onset Alzheimer’s disease, in which amyloid‑β accumulates in the brain. Amyloid‑β is a product of the chromosome 21 gene APP (amyloid precursor protein) and the extra copy or ‘dose’ of APP is thought to be the cause of this early‑onset Alzheimer’s disease. However, other chromosome 21 genes likely modulate disease when in three‑copies in people with Down syndrome. Here we show that an extra copy of chromosome 21 genes, other than APP, infuences APP/Aβ biology. We crossed Down syndrome mouse models with partial trisomies, to an APP transgenic model and found that extra copies of subgroups of chromosome 21 gene(s) modulate amyloid‑β aggregation and APP transgene‑associated mortality, independently of changing amyloid precursor protein abundance. Thus, genes on chromosome 21, other than APP, likely modulate Alzheimer’s disease in people who have Down syndrome. Down syndrome (DS), which occurs in approximately 1 in 1000 births, is the most common cause of early-onset Alzheimer’s disease-dementia (AD-DS)1. Approximately 6 million people have DS world-wide and by the age of 65 two-thirds of these individuals will have a clinical dementia diagnosis. -
Oxidative Stress in Portuguese Children with Down Syndrome
Down Syndrome Research and Practice 8(2), 79-82 79 Oxidative stress in Portuguese children with Down syndrome Monica Pinto1, 2, 3, Joaquim Neves2, Miguel Palha1,3 and Manuel Bicho2 1 Unidade de Desenvolvimento, Serviço de Pediatria, Hospital de Santa Maria, Lisboa, Portugal 2 Laboratório de Genética da Faculdade de Medicina de Lisboa, Hospital de Santa Maria, Lisboa, Portugal 3 Associação Portuguesa de Portadores de Trissomia 21 (APPT21), Portugal Abstract - Background - Individuals with Down syndrome have an accelerated process of ageing which is thought to be associated with oxidative stress. Aim - Since Zn/Cu superoxide dismutase is increased by about 50% in children with Down syndrome, glutathione and other less known antioxidant mechanisms were studied to determine whether there were changes in reactive oxygen species. Methods - Plasma reduced and oxidised glutathione and red blood cells enzymes including acid phosphatase, methemoglobin reductase and transmembrane reductase were evaluated in Portu- guese children with Down syndrome and their siblings, who were used as a control group. Results - No significant differences were found between the study and control groups. A nega- tive correlation was noted between total glutathione and acid phosphatase in the siblings without Down syndrome, but not in the children with Down syndrome. Conclusion - Although it is claimed that the production of hydrogen peroxide is enhanced in children with Down syndrome, their antioxidant mechanisms do not seem to be significantly dif- ferent compared with their siblings. This may result in an excess of reactive oxygen species that could help to explain accelerated ageing in children with Down syndrome. Further studies will be needed to shed light on these mechanisms. -
Clifford G. Andrew, MD, Ph.D. Neurology Resident 1976-79
Clifford G. Andrew, M.D., Ph.D. Neurology Resident 1976-79; Neuromuscular Fellow 1979-80; Assistant Professor of Neurology 1980- 86; Currently: Assistant Professor of Neurology Part-time, Johns Hopkins University, Baltimore, Maryland, MD; [email protected]; website www.neurol.org My time at Hopkins came at an important crossroads in my life: having completed my MD/PhD (Biochemistry) at Duke’s Medical Scientist Training Program with mentor Stan Appel, honing my clinical skills for long, continuing career in Neurology. In 1976 the department had 4 professors: Daniel Drachman, John Freeman, Richard Johnson & Guy McKhann who amazed us with trans-Atlantic sailing. There were “young Turk” assistant professors Jack Griffin, and David Zee; and incoming resident Justin McArthur (1981). We learned to “See one, do one, and show one.” and “If you don’t get your work done in 24 hours you just have to stay up late!” During this time we moved laboratories, clinics, and wards to the Adolf Meyer Building and I learned three things: 1) art of compassionate care for patients; 2) the importance of applying rigorous science to evidence-based medicine (1998 Physicians’ Health Study II, 2008 Harvard Personal Genome Project PGP-84, and 2018 NIH All Of Us Research Precision Medicine; and 3) the importance of life beyond career: sailing the Chesapeake Bay in a 22-foot Bristol; raising 6 children, and 8 grandchildren; leadership in Cub, Boy, explorer Scouts, UU Church of Annapolis, teaching Hominid evolution at UUCA’s Camp Beagle “Vacation Darwin School”, USNA Secular Midshipmen, and UU Humanists & Naturalists; section thru-hiking the Appalachian Trail’s 2200 miles from GA to Me. -
Identifying Pathophysiological Bases of Disease in COVID-19 Carla J
Goldin et al. Translational Medicine Communications (2020) 5:15 Translational Medicine https://doi.org/10.1186/s41231-020-00067-w Communications REVIEW Open Access Identifying pathophysiological bases of disease in COVID-19 Carla J. Goldin1,2, Ramiro Vázquez3,4, Fernando P. Polack1 and Damian Alvarez-Paggi1,2* Abstract COVID-19 is an infectious disease caused by the SARS-CoV-2 virus that can affect lung physiology encompassing a wide spectrum of severities, ranging from asymptomatic and mild symptoms to severe and fatal cases; the latter including massive neutrophil infiltration, stroke and multiple organ failure. Despite many recents findings, a clear mechanistic description underlying symptomatology is lacking. In this article, we thoroughly review the available data involving risk factors, age, gender, comorbidities, symptoms of disease, cellular and molecular mechanisms and the details behind host/pathogen interaction that hints at the existence of different pathophysiological mechanisms of disease. There is clear evidence that, by targeting the angiotensin-converting enzyme II (ACE2) –its natural receptor–, SARS-CoV-2 would mainly affect the renin- angiotensin-aldosterone system (RAAS), whose imbalance triggers diverse symptomatology-associated pathological processes. Downstream actors of the RAAS cascade are identified, and their interaction with risk factors and comorbidities are presented, rationalizing why a specific subgroup of individuals that present already lower ACE2 levels is particularly more susceptible to severe forms of disease. Finally, the notion of endotype discovery in the context of COVID-19 is introduced. We hypothesize that COVID-19, and its associated spectrum of severities, is an umbrella term covering different pathophysiological mechanisms (endotypes). This approach should dramatically accelerate our understanding and treatment of disease(s), enabling further discovery of pathophysiological mechanisms and leading to the identification of specific groups of patients that may benefit from personalized treatments. -
Increased Dosage of the Chromosome 21 Ortholog Dyrk1a Promotes Megakaryoblastic Leukemia in a Murine Model of Down Syndrome
Increased dosage of the chromosome 21 ortholog Dyrk1a promotes megakaryoblastic leukemia in a murine model of Down syndrome Sébastien Malinge, … , Sandeep Gurbuxani, John D. Crispino J Clin Invest. 2012;122(3):948-962. https://doi.org/10.1172/JCI60455. Research Article Individuals with Down syndrome (DS; also known as trisomy 21) have a markedly increased risk of leukemia in childhood but a decreased risk of solid tumors in adulthood. Acquired mutations in the transcription factor–encoding GATA1 gene are observed in nearly all individuals with DS who are born with transient myeloproliferative disorder (TMD), a clonal preleukemia, and/or who develop acute megakaryoblastic leukemia (AMKL). Individuals who do not have DS but bear germline GATA1 mutations analogous to those detected in individuals with TMD and DS-AMKL are not predisposed to leukemia. To better understand the functional contribution of trisomy 21 to leukemogenesis, we used mouse and human cell models of DS to reproduce the multistep pathogenesis of DS-AMKL and to identify chromosome 21 genes that promote megakaryoblastic leukemia in children with DS. Our results revealed that trisomy for only 33 orthologs of human chromosome 21 (Hsa21) genes was sufficient to cooperate with GATA1 mutations to initiate megakaryoblastic leukemia in vivo. Furthermore, through a functional screening of the trisomic genes, we demonstrated that DYRK1A, which encodes dual-specificity tyrosine-(Y)-phosphorylation–regulated kinase 1A, was a potent megakaryoblastic tumor–promoting gene that contributed