DOCSLIB.ORG

Université De Montréal Using Whole-Exome Sequencing Data In

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Université De Montréal Using Whole-Exome Sequencing Data In Université de Montréal Using Whole-Exome Sequencing Data in an Exome-Wide Association Study Approach to Identify Genetic Risk Factors Influencing Acute Lymphoblastic Leukemia Response: A Focus on Asparaginase Complications & Vincristine-Induced Peripheral Neuropathy par RACHID ABAJI Département de Pharmacologie et de Physiologie Faculté de médicine Thèse présentée en vue de l’obtention du grade de Doctorat en Pharmacologie (option Phamacogénomique) Décembre 2018 © RACHID ABAJI, 2018 Université de Montréal Département de Pharmacologie et de Physiologie Faculté de médicine Cette thèse intitulée : Using Whole-Exome Sequencing Data in an Exome-Wide Association Study Approach to Identify Genetic Risk Factors Influencing Acute Lymphoblastic Leukemia Response: A Focus on Asparaginase Complications & Vincristine-Induced Peripheral Neuropathy Présentée par : Rachid Abaji A été évaluée par un jury composé des personnes suivantes Dr. Noël J-M Raynal Président-rapporteur Dre. Maja Krajinovic Directeur de recherche Dr. Simon De Denus Membre du jury Dre. Isabelle Laverdière Examinateur externe Dr. Réné Cardinal Représentant du doyen I. Resumé Le traitement de la leucémie lymphoblastique aiguë (LLA) de l’enfant, une affection d'origine maligne des cellules progénitrices lymphoïdes, s’est considérablement amélioré au cours des dernières décennies. En effet, le taux de succès du traitement a dépassé 90% dans des conditions favorables. Cependant, des toxicités liées au traitement peuvent être fatales et entrainer l’interruption ou la cessation du traitement. L'allergie, la pancréatite et la thrombose sont des complications fréquentes du traitement de la LLA et sont associées à l'utilisation de l'asparaginase (ASNase), tandis qu’une toxicité fréquente due à la vincristine (VCR) induit la neuropathie périphérique (VIPN). Étant donné que l’ajustement du schéma posologique afin d’augmenter l'efficacité et diminuer la toxicité est un processus sensible, ceci demeure un défi majeur dans plusieurs protocoles de traitement. La pharmacogénétique étudie comment des altérations de la composante génétique peuvent influer sur la variabilité interindividuelle observée dans la réponse au traitement. Une meilleure compréhension de la base moléculaire de cette variabilité pourrait améliorer considérablement les résultats du traitement, en permettant la personnalisation de ce dernier en fonction du profil génétique du patient. Des études récentes suggèrent l’avantage d’appliquer l’analyse de l’exome à la découverte de variants associés à des traits humains complexes ainsi qu’à des phénotypes de réactions médicamenteuses. L'objectif de notre travail était d'utiliser les données de séquençage pour réaliser des études d'association à l'échelle de l'exome, y compris des étapes de filtrage et de validation, afin d'identifier de nouveaux variants génétiques susceptibles de moduler le risque de développer des complications associées à ASNase et à VIPN. i Douze SNP étaient associés à des complications due à l’ASNase dans la cohorte initiale, dont 3 étaient associés à une allergie, 3 à une pancréatite et 6 à une thrombose. Parmi ceux-ci, les variants rs3809849, rs11556218 et rs34708521 des gènes MYBBP1A, IL16 et SPEF2 respectivement ont été associés à des complications multiples et leur association à une pancréatite a été répliquée dans une cohorte de validation indépendante. En ce qui concerne la VCR, trois variantes ont été associées à la modulation du risque de VIPN: rs2781377 dans SYNE2, rs10513762 dans MRPL47 et rs3803357 dans BAHD1. Nous démontrons également le puissant effet combiné de la présence de plusieurs variants de risque pour chacune des toxicités étudiées et fournissons des modèles de prédiction du risque pour la pancréatite et le VIPN basés sur la méthode d’évaluation du risque génétique pondérée et qui ont été validés à l’interne. De plus, étant donné une association du polymorphisme du gène MYBBP1A avec de multiples issus de traitement, nous avons cherché à comprendre comment cette altération génétique se traduit par des variabilités de réponse aux traitements à l’ASNase. En utilisant la technique CRISPR-CAS9 pour induire l'inactivation de gènes dans des lignées cellulaires cancéreuses PANC1 (pancréatiques) nous avons testé la différence de viabilité entre les cellules inactivées et les cellules du type sauvage à la suite de la suppression du gène et du traitement par ASNase. Nos résultats suggèrent un rôle fonctionnel de ce gène dans la modulation de la viabilité, de la capacité de prolifération et de la morphologie des cellules knock-out, ainsi que dans leur sensibilité à l'ASNase, et plaident en outre pour que le gène influence l’issus du traitement de la LLA par ASNase. ii Le présent travail démontre que l’utilisation de l’approche de séquençage de l’exome entier dans le contexte d’une étude d’association à l’échelle de l’exome est une stratégie valide « sans hypothèse » pour identifier de nouveaux marqueurs génétiques modulant l’effet du traitement de la LLA de l’enfant, et souligne l’importance de l'effet synergique de la combinaison des locus à risque. Mots clés: Leucémie lymphoblastique aiguë; effets indésirables des médicaments; asparaginase; étude d'association; pan-exomique; neuropathie; pancréatite; pharmacogénétique; vincristine; séquençage de l'exome entier. iii II. Abstract Treatment of childhood acute lymphoblastic leukemia (ALL), a malignant disorder of lymphoid progenitor cells has improved significantly over the past decades and treatment success rates have surpassed 90% in favorable settings. However, treatment-related toxicities can be life-threatening and cause treatment interruption or cessation. Allergy, pancreatitis and thrombosis are common complications of ALL treatment associated with the use of asparaginase (ASNase), while vincristine-induced peripheral neuropathy (VIPN) is a frequent toxicity of vincristine (VCR). It is a sensitive process and a constant struggle to adjust the dosing regimen to ensure maximum efficacy and minimum toxicity. Pharmacogenetics studies show alterations in the genetic component between individuals can influence the observed variability in treatment response. A better understanding of the molecular basis of this variability in drug effect could significantly improve treatment outcome by allowing the personalization of ALL treatment based on the genetic profile of the patient. Emerging reports suggest the benefit of applying exome analysis to uncover variants associated with complex human traits as well as drug response phenotypes. Our objective in this work was to use available whole-exome sequencing data to perform exome-wide association studies followed by stepwise filtering and validation processes to identify novel variants with a potential to modulate the risk of developing ASNase complications and VIPN. iv Twelve SNPs were associated with ASNase complications in the discovery cohort including 3 associated with allergy, 3 with pancreatitis and 6 with thrombosis. Of those, rs3809849 in MYBBP1A, rs11556218 in IL16 and rs34708521 in SPEF2 genes were associated with multiple complications and their association with pancreatitis was replicated in an independent validation cohort. As for VCR, three variants were associated with modulating the risk of VIPN: rs2781377 in SYNE2, rs10513762 in MRPL47 and rs3803357 in BAHD1. We also demonstrate a strong combined effect of harbouring multiple risk variants for each of the studied toxicities, and provide internally-validated risk-prediction models based on the weighted genetic risk score method for pancreatitis and VIPN. Furthermore, given the association of the polymorphism in MYBBP1A gene with multiple treatment outcomes, we aimed at understanding how this genetic alteration translates into differences in ASNase treatment response through cell-based functional analysis. Using CRISPR-CAS9 technology we produced gene knockout of PANC1 (pancreatic) cancer cell-lines and tested the difference in viability between the knockouts and wild-type cells following gene deletion and ASNase treatment. Our results suggest a functional role of this gene in modulating the viability, proliferation capacity and the morphology of the knockout cells as well as their sensitivity to ASNase and further advocates the implication of the gene in influencing the outcome of ALL treatment with ASNase. v The present work demonstrates that using whole-exome sequencing data in the context of exome-wide association study is a successful “hypothesis-free” strategy for identifying novel genetic markers modulating the effect of childhood ALL treatment and highlights the importance of the synergistic effect of combining risk loci. Keywords: Acute lymphoblastic leukemia; adverse drug reactions; asparaginase; association study; exome-wide; neuropathy; pancreatitis; pharmacogenetics; vincristine; whole-exome sequencing. vi III. Table of Contents I. Resumé ................................................................................................................. i II. Abstract ............................................................................................................. iv III. Table of Contents .......................................................................................... vii IV. List of Figures ................................................................................................ xv V. List of Tables ................................................................................................ xviii VI. Abbreviations and Acronyms .....................................................................
Load more

Recommended publications
  • In-Depth Analysis of Genetic Variation Associated with Severe West Nile Viral Disease
    Article In-Depth Analysis of Genetic Variation Associated with Severe West Nile Viral Disease Megan E. Cahill 1, Mark Loeb 2, Andrew T. Dewan 1 and Ruth R. Montgomery 3,* 1 Center for Perinatal, Pediatric and Environmental Epidemiology, Department of Chronic Disease Epidemiology, Yale School of Public Health, 1 Church Street, New Haven, CT 06510, USA; [email protected] (M.E.C.); [email protected] (A.T.D.) 2 3208 Michael DeGroote Centre for Learning & Discovery, Division of Clinical Pathology, McMaster University, Hamilton, ON L8S 4L8, Canada; [email protected] 3 Department of Internal Medicine, Yale School of Medicine, 300 Cedar Street, New Haven, CT 06520, USA * Correspondence: [email protected] Received: 30 October 2020; Accepted: 3 December 2020; Published: 8 December 2020 Abstract: West Nile virus (WNV) is a mosquito-borne virus which causes symptomatic disease in a minority of infected humans. To identify novel genetic variants associated with severe disease, we utilized data from an existing case-control study of WNV and included population controls for an expanded analysis. We conducted imputation and gene-gene interaction analysis in the largest and most comprehensive genetic study conducted to date for West Nile neuroinvasive disease (WNND). Within the imputed West Nile virus dataset (severe cases n = 381 and asymptomatic/mild controls = 441), we found novel loci within the MCF.2 Cell Line Derived Transforming Sequence Like (MCF2L) gene (rs9549655 and rs2297192) through the individual loci analyses, although none reached statistical significance. Incorporating population controls from the Wisconsin Longitudinal Study on Aging (n = 9012) did not identify additional novel variants, a possible reflection of the cohort’s inclusion of individuals who could develop mild or severe WNV disease upon infection.
    [Show full text]
  • Funktionelle in Vitro Und in Vivo Charakterisierung Des Putativen Tumorsuppressorgens SFRP1 Im Humanen Mammakarzinom
    Funktionelle in vitro und in vivo Charakterisierung des putativen Tumorsuppressorgens SFRP1 im humanen Mammakarzinom Von der Fakult¨at fur¨ Mathematik, Informatik und Naturwissenschaften der RWTH Aachen University zur Erlangung des akademischen Grades einer Doktorin der Naturwissenschaften genehmigte Dissertation vorgelegt von Diplom-Biologin Laura Huth (geb. Franken) aus Julich¨ Berichter: Universit¨atsprofessor Dr. rer. nat. Edgar Dahl Universit¨atsprofessor Dr. rer. nat. Ralph Panstruga Tag der mundlichen¨ Prufung:¨ 6. August 2014 Diese Dissertation ist auf den Internetseiten der Hochschulbibliothek online verfugbar.¨ Zusammenfassung Krebserkrankungen stellen weltweit eine der h¨aufigsten Todesursachen dar. Aus diesem Grund ist die Aufkl¨arung der zugrunde liegenden Mechanismen und Ur- sachen ein essentielles Ziel der molekularen Onkologie. Die Tumorforschung der letzten Jahre hat gezeigt, dass die Entstehung solider Karzinome ein Mehrstufen- Prozess ist, bei dem neben Onkogenen auch Tumorsuppresorgene eine entschei- dende Rolle spielen. Viele der heute bekannten Gene des WNT-Signalweges wur- den bereits als Onkogene oder Tumorsuppressorgene charakterisiert. Eine Dere- gulation des WNT-Signalweges wird daher mit der Entstehung und Progression vieler humaner Tumorentit¨aten wie beispielsweise auch dem Mammakarzinom, der weltweit h¨aufigsten Krebserkrankung der Frau, assoziiert. SFRP1, ein nega- tiver Regulator der WNT-Signalkaskade, wird in Brusttumoren haupts¨achlich durch den epigenetischen Mechanismus der Promotorhypermethylierung
    [Show full text]
  • Understanding Chronic Kidney Disease: Genetic and Epigenetic Approaches
    University of Pennsylvania ScholarlyCommons Publicly Accessible Penn Dissertations 2017 Understanding Chronic Kidney Disease: Genetic And Epigenetic Approaches Yi-An Ko Ko University of Pennsylvania, [email protected] Follow this and additional works at: https://repository.upenn.edu/edissertations Part of the Bioinformatics Commons, Genetics Commons, and the Systems Biology Commons Recommended Citation Ko, Yi-An Ko, "Understanding Chronic Kidney Disease: Genetic And Epigenetic Approaches" (2017). Publicly Accessible Penn Dissertations. 2404. https://repository.upenn.edu/edissertations/2404 This paper is posted at ScholarlyCommons. https://repository.upenn.edu/edissertations/2404 For more information, please contact [email protected]. Understanding Chronic Kidney Disease: Genetic And Epigenetic Approaches Abstract The work described in this dissertation aimed to better understand the genetic and epigenetic factors influencing chronic kidney disease (CKD) development. Genome-wide association studies (GWAS) have identified single nucleotide polymorphisms (SNPs) significantly associated with chronic kidney disease. However, these studies have not effectively identified target genes for the CKD variants. Most of the identified variants are localized to non-coding genomic regions, and how they associate with CKD development is not well-understood. As GWAS studies only explain a small fraction of heritability, we hypothesized that epigenetic changes could explain part of this missing heritability. To identify potential gene targets of the genetic variants, we performed expression quantitative loci (eQTL) analysis, using genotyping arrays and RNA sequencing from human kidney samples. To identify the target genes of CKD-associated SNPs, we integrated the GWAS-identified SNPs with the eQTL results using a Bayesian colocalization method, coloc. This resulted in a short list of target genes, including PGAP3 and CASP9, two genes that have been shown to present with kidney phenotypes in knockout mice.
    [Show full text]
  • Myopia in African Americans Is Significantly Linked to Chromosome 7P15.2-14.2
    Genetics Myopia in African Americans Is Significantly Linked to Chromosome 7p15.2-14.2 Claire L. Simpson,1,2,* Anthony M. Musolf,2,* Roberto Y. Cordero,1 Jennifer B. Cordero,1 Laura Portas,2 Federico Murgia,2 Deyana D. Lewis,2 Candace D. Middlebrooks,2 Elise B. Ciner,3 Joan E. Bailey-Wilson,1,† and Dwight Stambolian4,† 1Department of Genetics, Genomics and Informatics and Department of Ophthalmology, University of Tennessee Health Science Center, Memphis, Tennessee, United States 2Computational and Statistical Genomics Branch, National Human Genome Research Institute, National Institutes of Health, Baltimore, Maryland, United States 3The Pennsylvania College of Optometry at Salus University, Elkins Park, Pennsylvania, United States 4Department of Ophthalmology, University of Pennsylvania, Philadelphia, Pennsylvania, United States Correspondence: Joan E. PURPOSE. The purpose of this study was to perform genetic linkage analysis and associ- Bailey-Wilson, NIH/NHGRI, 333 ation analysis on exome genotyping from highly aggregated African American families Cassell Drive, Suite 1200, Baltimore, with nonpathogenic myopia. African Americans are a particularly understudied popula- MD 21131, USA; tion with respect to myopia. [email protected]. METHODS. One hundred six African American families from the Philadelphia area with a CLS and AMM contributed equally to family history of myopia were genotyped using an Illumina ExomePlus array and merged this work and should be considered co-first authors. with previous microsatellite data. Myopia was initially measured in mean spherical equiv- JEB-W and DS contributed equally alent (MSE) and converted to a binary phenotype where individuals were identified as to this work and should be affected, unaffected, or unknown.
    [Show full text]
  • Cryo-EM Structure of the Polycystic Kidney Disease-Like Channel PKD2L1
    ARTICLE DOI: 10.1038/s41467-018-03606-0 OPEN Cryo-EM structure of the polycystic kidney disease-like channel PKD2L1 Qiang Su1,2,3, Feizhuo Hu1,3,4, Yuxia Liu4,5,6,7, Xiaofei Ge1,2, Changlin Mei8, Shengqiang Yu8, Aiwen Shen8, Qiang Zhou1,3,4,9, Chuangye Yan1,2,3,9, Jianlin Lei 1,2,3, Yanqing Zhang1,2,3,9, Xiaodong Liu2,4,5,6,7 & Tingliang Wang1,3,4,9 PKD2L1, also termed TRPP3 from the TRPP subfamily (polycystic TRP channels), is involved 1234567890():,; in the sour sensation and other pH-dependent processes. PKD2L1 is believed to be a non- selective cation channel that can be regulated by voltage, protons, and calcium. Despite its considerable importance, the molecular mechanisms underlying PKD2L1 regulations are largely unknown. Here, we determine the PKD2L1 atomic structure at 3.38 Å resolution by cryo-electron microscopy, whereby side chains of nearly all residues are assigned. Unlike its ortholog PKD2, the pore helix (PH) and transmembrane segment 6 (S6) of PKD2L1, which are involved in upper and lower-gate opening, adopt an open conformation. Structural comparisons of PKD2L1 with a PKD2-based homologous model indicate that the pore domain dilation is coupled to conformational changes of voltage-sensing domains (VSDs) via a series of π–π interactions, suggesting a potential PKD2L1 gating mechanism. 1 Ministry of Education Key Laboratory of Protein Science, Tsinghua University, Beijing 100084, China. 2 School of Life Sciences, Tsinghua University, Beijing 100084, China. 3 Beijing Advanced Innovation Center for Structural Biology, Tsinghua University, Beijing 100084, China. 4 School of Medicine, Tsinghua University, Beijing 100084, China.
    [Show full text]
  • Analysis of the Indacaterol-Regulated Transcriptome in Human Airway
    Supplemental material to this article can be found at: http://jpet.aspetjournals.org/content/suppl/2018/04/13/jpet.118.249292.DC1 1521-0103/366/1/220–236$35.00 https://doi.org/10.1124/jpet.118.249292 THE JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS J Pharmacol Exp Ther 366:220–236, July 2018 Copyright ª 2018 by The American Society for Pharmacology and Experimental Therapeutics Analysis of the Indacaterol-Regulated Transcriptome in Human Airway Epithelial Cells Implicates Gene Expression Changes in the s Adverse and Therapeutic Effects of b2-Adrenoceptor Agonists Dong Yan, Omar Hamed, Taruna Joshi,1 Mahmoud M. Mostafa, Kyla C. Jamieson, Radhika Joshi, Robert Newton, and Mark A. Giembycz Departments of Physiology and Pharmacology (D.Y., O.H., T.J., K.C.J., R.J., M.A.G.) and Cell Biology and Anatomy (M.M.M., R.N.), Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada Received March 22, 2018; accepted April 11, 2018 Downloaded from ABSTRACT The contribution of gene expression changes to the adverse and activity, and positive regulation of neutrophil chemotaxis. The therapeutic effects of b2-adrenoceptor agonists in asthma was general enriched GO term extracellular space was also associ- investigated using human airway epithelial cells as a therapeu- ated with indacaterol-induced genes, and many of those, in- tically relevant target. Operational model-fitting established that cluding CRISPLD2, DMBT1, GAS1, and SOCS3, have putative jpet.aspetjournals.org the long-acting b2-adrenoceptor agonists (LABA) indacaterol, anti-inflammatory, antibacterial, and/or antiviral activity. Numer- salmeterol, formoterol, and picumeterol were full agonists on ous indacaterol-regulated genes were also induced or repressed BEAS-2B cells transfected with a cAMP-response element in BEAS-2B cells and human primary bronchial epithelial cells by reporter but differed in efficacy (indacaterol $ formoterol .
    [Show full text]
  • Identification of Transcriptional Mechanisms Downstream of Nf1 Gene Defeciency in Malignant Peripheral Nerve Sheath Tumors Daochun Sun Wayne State University
    Wayne State University DigitalCommons@WayneState Wayne State University Dissertations 1-1-2012 Identification of transcriptional mechanisms downstream of nf1 gene defeciency in malignant peripheral nerve sheath tumors Daochun Sun Wayne State University, Follow this and additional works at: http://digitalcommons.wayne.edu/oa_dissertations Recommended Citation Sun, Daochun, "Identification of transcriptional mechanisms downstream of nf1 gene defeciency in malignant peripheral nerve sheath tumors" (2012). Wayne State University Dissertations. Paper 558. This Open Access Dissertation is brought to you for free and open access by DigitalCommons@WayneState. It has been accepted for inclusion in Wayne State University Dissertations by an authorized administrator of DigitalCommons@WayneState. IDENTIFICATION OF TRANSCRIPTIONAL MECHANISMS DOWNSTREAM OF NF1 GENE DEFECIENCY IN MALIGNANT PERIPHERAL NERVE SHEATH TUMORS by DAOCHUN SUN DISSERTATION Submitted to the Graduate School of Wayne State University, Detroit, Michigan in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY 2012 MAJOR: MOLECULAR BIOLOGY AND GENETICS Approved by: _______________________________________ Advisor Date _______________________________________ _______________________________________ _______________________________________ © COPYRIGHT BY DAOCHUN SUN 2012 All Rights Reserved DEDICATION This work is dedicated to my parents and my wife Ze Zheng for their continuous support and understanding during the years of my education. I could not achieve my goal without them. ii ACKNOWLEDGMENTS I would like to express tremendous appreciation to my mentor, Dr. Michael Tainsky. His guidance and encouragement throughout this project made this dissertation come true. I would also like to thank my committee members, Dr. Raymond Mattingly and Dr. John Reiners Jr. for their sustained attention to this project during the monthly NF1 group meetings and committee meetings, Dr.
    [Show full text]
  • Produktinformation
    Produktinformation Diagnostik & molekulare Diagnostik Laborgeräte & Service Zellkultur & Verbrauchsmaterial Forschungsprodukte & Biochemikalien Weitere Information auf den folgenden Seiten! See the following pages for more information! Lieferung & Zahlungsart Lieferung: frei Haus Bestellung auf Rechnung SZABO-SCANDIC Lieferung: € 10,- HandelsgmbH & Co KG Erstbestellung Vorauskassa Quellenstraße 110, A-1100 Wien T. +43(0)1 489 3961-0 Zuschläge F. +43(0)1 489 3961-7 [email protected] • Mindermengenzuschlag www.szabo-scandic.com • Trockeneiszuschlag • Gefahrgutzuschlag linkedin.com/company/szaboscandic • Expressversand facebook.com/szaboscandic CSTL1 Antibody Product Code CSB-PA006101GA01HU Abbreviation CSTL1-Specific Storage Upon receipt, store at -20°C or -80°C. Avoid repeated freeze. Uniprot No. Q9H114 Immunogen Human CSTL1-Specific Raised In Rabbit Species Reactivity Human,Mouse Tested Applications ELISA,IHC Storage Buffer PBS with 0.02% Sodium Azide, 50% Glycerol, pH 7.3. -20°C, Avoid freeze / thaw cycles. Purification Method Antigen Affinity purified Isotype IgG Alias cystatin-like 1;CSTL1;RCET11;dJ322G13.4 ; Product Type Purified Rabbit Anti Human PolyClonal Antibody Species Homo sapiens (Human) Target Names CSTL1 Target Details The cystatin superfamily encompasses proteins that contain multiple cystatin- like sequences. Some of the members are active cysteine protease inhibitors, while others have lost or perhaps never acquired this inhibitory activity. There are three inhibitory families in the superfamily, including the type 1 cystatins (stefins), type 2 cystatins and the kininogens. The type 2 cystatin proteins are a class of cysteine proteinase inhibitors found in a variety of human fluids and secretions. The cystatin locus on chromosome 20 contains the majority of the type 2 cystatin genes and pseudogenes. This gene is located at the telomeric end of the cystatin locus and encodes a type 2 cystatin-like protein.
    [Show full text]
  • Function and Regulation of Polycystin-2 and Epithelial Sodium Channel
    Function and Regulation of Polycystin-2 and Epithelial Sodium Channel by Qian Wang A thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy Department of Physiology University of Alberta © Qian Wang, 2016 ABSTRACT Polycystin-2, encoded by the PKD2 gene, is mutated in ~15% of autosomal dominant polycystic kidney disease, and functions as a Ca2+ permeable non-selective cation channel. It is mainly localized on the endoplasmic reticulum membrane, and is also present on the plasma membrane and primary cilium. Polycystin-2 is critical for cellular homeostasis and thus a tight regulation of its expression and function is needed. In Chapter 2, filamin-A, a large cytoskeletal actin-binding protein, was identified as a novel polycystin-2 binding partner. Their physical interaction was confirmed by different molecular biology techniques, e.g., yeast two-hybrid, GST pull-down, and co-immunoprecipitation. Filamin-A C terminal fragment (FLNAC) mediates the interaction with both N- and C- termini of polycystin-2. Functional study in lipid bilayer reconstitution system showed that filamin substantially inhibits polycystin-2 channel activity. This study indicates that filamin is an important regulator of polycystin-2 channel function, and further links actin cytoskeletal dynamics to the regulation of this channel. In Chapter 3, further effect of filamin on polycystin-2 stability was studied using filamin-deficient and filamin-A replete human melanoma cells, as well other human cell lines together with filamin-A siRNA/shRNA knockdown. Filamin-A was found to repress polycystin-2 degradation and enhance its total expression and plasma membrane targeting.
    [Show full text]
  • High-Fat Diet Alters the Retinal Transcriptome in the Absence of Gut Microbiota
    cells Article High-Fat Diet Alters the Retinal Transcriptome in the Absence of Gut Microbiota David Dao 1, Bingqing Xie 2,3 , Urooba Nadeem 4, Jason Xiao 1, Asad Movahedan 5, Mark D’Souza 2, Vanessa Leone 6,7 , Seenu M. Hariprasad 1, Eugene B. Chang 7, Dinanath Sulakhe 3 and Dimitra Skondra 1,* 1 Department of Ophthalmology and Visual Science, University of Chicago, Chicago, IL 60637, USA; [email protected] (D.D.); [email protected] (J.X.); [email protected] (S.M.H.) 2 Center for Research Informatics, University of Chicago, Chicago, IL 60637, USA; [email protected] (B.X.); [email protected] (M.D.) 3 Department of Medicine, University of Chicago, Chicago, IL 60637, USA; [email protected] 4 Department of Pathology, University of Chicago, Chicago, IL 60637, USA; [email protected] 5 Department of Ophthalmology and Visual Science, Yale University School of Medicine, New Haven, CT 06437, USA; [email protected] 6 Department of Animal Biologics and Metabolism, University of Wisconsin, Madison, WI 53706, USA; [email protected] 7 Knapp Center for Biomedical Discovery, Department of Medicine, Microbiome Medicine Program, University of Chicago, Chicago, IL 60637, USA; [email protected] * Correspondence: [email protected] Abstract: The relationship between retinal disease, diet, and the gut microbiome has shown increasing importance over recent years. In particular, high-fat diets (HFDs) are associated with development and progression of several retinal diseases, including age-related macular degeneration (AMD) and Citation: Dao, D.; Xie, B.; Nadeem, diabetic retinopathy. However, the complex, overlapping interactions between diet, gut microbiome, U.; Xiao, J.; Movahedan, A.; D’Souza, and retinal homeostasis are poorly understood.
    [Show full text]
  • Histone H3.3 and Its Proteolytically Processed Form Drive a Cellular Senescence Programme
    ARTICLE Received 21 Mar 2014 | Accepted 9 Sep 2014 | Published 14 Nov 2014 DOI: 10.1038/ncomms6210 Histone H3.3 and its proteolytically processed form drive a cellular senescence programme Luis F. Duarte1,2,3, Andrew R.J. Young4, Zichen Wang3,5, Hsan-Au Wu1,3, Taniya Panda1,2, Yan Kou3,5, Avnish Kapoor1,2,w, Dan Hasson1,2, Nicholas R. Mills1,2, Avi Ma’ayan5, Masashi Narita4 & Emily Bernstein1,2 The process of cellular senescence generates a repressive chromatin environment, however, the role of histone variants and histone proteolytic cleavage in senescence remains unclear. Here, using models of oncogene-induced and replicative senescence, we report novel histone H3 tail cleavage events mediated by the protease Cathepsin L. We find that cleaved forms of H3 are nucleosomal and the histone variant H3.3 is the preferred cleaved form of H3. Ectopic expression of H3.3 and its cleavage product (H3.3cs1), which lacks the first 21 amino acids of the H3 tail, is sufficient to induce senescence. Further, H3.3cs1 chromatin incorporation is mediated by the HUCA histone chaperone complex. Genome-wide transcriptional profiling revealed that H3.3cs1 facilitates transcriptional silencing of cell cycle regulators including RB/E2F target genes, likely via the permanent removal of H3K4me3. Collectively, our study identifies histone H3.3 and its proteolytically processed forms as key regulators of cellular senescence. 1 Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, New York 10029, USA. 2 Department of Dermatology, Icahn School of Medicine at Mount Sinai, One Gustave L.
    [Show full text]
  • New Approach for Untangling the Role of Uncommon Calcium-Binding Proteins in the Central Nervous System
    brain sciences Review New Approach for Untangling the Role of Uncommon Calcium-Binding Proteins in the Central Nervous System Krisztina Kelemen * and Tibor Szilágyi Department of Physiology, Doctoral School, Faculty of Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Târgu Mures, , Romania; [email protected] * Correspondence: [email protected]; Tel.: +40-746-248064 Abstract: Although Ca2+ ion plays an essential role in cellular physiology, calcium-binding proteins (CaBPs) were long used for mainly as immunohistochemical markers of specific cell types in different regions of the central nervous system. They are a heterogeneous and wide-ranging group of proteins. Their function was studied intensively in the last two decades and a tremendous amount of informa- tion was gathered about them. Girard et al. compiled a comprehensive list of the gene-expression profiles of the entire EF-hand gene superfamily in the murine brain. We selected from this database those CaBPs which are related to information processing and/or neuronal signalling, have a Ca2+- buffer activity, Ca2+-sensor activity, modulator of Ca2+-channel activity, or a yet unknown function. In this way we created a gene function-based selection of the CaBPs. We cross-referenced these findings with publicly available, high-quality RNA-sequencing and in situ hybridization databases (Human Protein Atlas (HPA), Brain RNA-seq database and Allen Brain Atlas integrated into the HPA) and created gene expression heat maps of the regional and cell type-specific expression levels of the selected CaBPs. This represents a useful tool to predict and investigate different expression patterns and functions of the less-known CaBPs of the central nervous system.
    [Show full text]