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Kountourantzis A, Minoudi S, Karaiskou N, Papakostas S, Moulistanos A, Baka RD, Tsartsianidou V, Vlachavas A, Aivaliotis M, Polizopoulou ZS, Triantafyllidis A. Prevalence of SOD1 allele associated with degenerative myelopathy in canine population in Greece. Res Vet Sci 2023; 162:104959. [PMID: 37480717 DOI: 10.1016/j.rvsc.2023.104959] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 03/09/2023] [Accepted: 07/16/2023] [Indexed: 07/24/2023]
Abstract
Canine degenerative myelopathy (CDM) is a late-onset fatal disorder associated with a point mutation of the superoxide dismutase 1 (SOD1) gene (c.118G > A). The purpose of this study was to determine the genotype and allele frequencies of this mutation in 108 dogs, mainly in Belgian Malinois and German Shepherd dogs with (CDM-affected group) and without CDM clinical symptoms (control group) in Greece. Genotyping of the c.118G > A mutation was possible by Sanger sequencing and PCR-RFLP. The observed genotype frequencies for the control group were 89.4% for the homozygous (G/G), 9.6% for the heterozygous (A/G), and 0.96% for the homozygous mutant (A/A) allele. The mutant allele was not common in the Belgian Malinois dogs (allele frequency = 0.029), but quite common in the German Shepherd dogs (allele frequency = 0.138). In the CDM affected group, all 4 dogs were homozygous for the mutant allele. These frequencies were close to those expected, indicating no significant departure from Hardy-Weinberg equilibrium. A strong but not statistically significant association between the mutant allele and CDM was observed. A previously identified deletion upstream of the mutation of interest was found at a high frequency (0.361) in the population.
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Affiliation(s)
- Antonis Kountourantzis
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Styliani Minoudi
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Genomics and Epigenomics Translational Research (GENeTres), Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Thessaloniki 57001, Greece
| | - Nikoleta Karaiskou
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Genomics and Epigenomics Translational Research (GENeTres), Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Thessaloniki 57001, Greece
| | - Spiros Papakostas
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Genomics and Epigenomics Translational Research (GENeTres), Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Thessaloniki 57001, Greece
| | - Aristotelis Moulistanos
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Genomics and Epigenomics Translational Research (GENeTres), Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Thessaloniki 57001, Greece
| | - Rania D Baka
- Diagnostic Laboratory, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Valentina Tsartsianidou
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Genomics and Epigenomics Translational Research (GENeTres), Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Thessaloniki 57001, Greece
| | - Antonios Vlachavas
- Laboratory of Parasitology and Parasitic Diseases, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Michalis Aivaliotis
- Genomics and Epigenomics Translational Research (GENeTres), Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Thessaloniki 57001, Greece; Laboratory of Biological Chemistry, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Functional Proteomics and Systems Biology (FunPATh), Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Thessaloniki 57001, Greece; Institute of Molecular Biology & Biotechnology, Foundation for Research & Technology Hellas, 100 N. Plastira Street, 700 13, Heraklion, Crete, Greece; Basic and Translational Research Unit, Biomedical Research and Education Special Uniτ, School of Medicine, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
| | - Zoe S Polizopoulou
- Diagnostic Laboratory, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Alexandros Triantafyllidis
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Genomics and Epigenomics Translational Research (GENeTres), Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Thessaloniki 57001, Greece.
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2
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SLC25A12 Missense Variant in Nova Scotia Duck Tolling Retrievers Affected by Cerebellar Degeneration-Myositis Complex (CDMC). Genes (Basel) 2022; 13:genes13071223. [PMID: 35886006 PMCID: PMC9319113 DOI: 10.3390/genes13071223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 07/06/2022] [Accepted: 07/07/2022] [Indexed: 11/17/2022] Open
Abstract
We investigated two litters of distantly related Nova Scotia Duck Tolling Retrievers (NSDTR), of which four puppies were affected by cerebellar signs with or without neuromuscular weakness. The phenotype was termed cerebellar degeneration—myositis complex (CDMC). We suspected a heritable condition and initiated a genetic analysis. The genome of one affected dog was sequenced and compared to 565 control genomes. This search yielded a private protein-changing SLC25A12 variant in the affected dog, XM_038584842.1:c.1337C>T, predicted to result in the amino acid change XP_038440770.1:(p.Pro446Leu). The genotypes at the variant co-segregated with the phenotype as expected for a monogenic autosomal recessive mode of inheritance in both litters. Genotyping of 533 additional NSDTR revealed variant allele frequencies of 3.6% and 1.3% in a European and a North American cohort, respectively. The available clinical and biochemical data, together with current knowledge about SLC25A12 variants and their functional impact in humans, mice, and dogs, suggest the p.Pro446Leu variant is a candidate causative defect for the observed phenotype in the affected dogs.
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3
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Abstract
Epilepsy is a common neurological disease in both humans and domestic dogs, making dogs an ideal translational model of epilepsy. In both species, epilepsy is a complex brain disease characterized by an enduring predisposition to generate spontaneous recurrent epileptic seizures. Furthermore, as in humans, status epilepticus is one of the more common neurological emergencies in dogs with epilepsy. In both species, epilepsy is not a single disease but a group of disorders characterized by a broad array of clinical signs, age of onset, and underlying causes. Brain imaging suggests that the limbic system, including the hippocampus and cingulate gyrus, is often affected in canine epilepsy, which could explain the high incidence of comorbid behavioral problems such as anxiety and cognitive alterations. Resistance to antiseizure medications is a significant problem in both canine and human epilepsy, so dogs can be used to study mechanisms of drug resistance and develop novel therapeutic strategies to benefit both species. Importantly, dogs are large enough to accommodate intracranial EEG and responsive neurostimulation devices designed for humans. Studies in epileptic dogs with such devices have reported ictal and interictal events that are remarkably similar to those occurring in human epilepsy. Continuous (24/7) EEG recordings in a select group of epileptic dogs for >1 year have provided a rich dataset of unprecedented length for studying seizure periodicities and developing new methods for seizure forecasting. The data presented in this review substantiate that canine epilepsy is an excellent translational model for several facets of epilepsy research. Furthermore, several techniques of inducing seizures in laboratory dogs are discussed as related to therapeutic advances. Importantly, the development of vagus nerve stimulation as a novel therapy for drug-resistant epilepsy in people was based on a series of studies in dogs with induced seizures. Dogs with naturally occurring or induced seizures provide excellent large-animal models to bridge the translational gap between rodents and humans in the development of novel therapies. Furthermore, because the dog is not only a preclinical species for human medicine but also a potential patient and pet, research on this species serves both veterinary and human medicine.
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Affiliation(s)
- Wolfgang Löscher
- Department of Pharmacology, Toxicology and Pharmacy, University of Veterinary Medicine, Hannover, Germany
- Center for Systems Neuroscience, Hannover, Germany
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4
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Hytönen MK, Sarviaho R, Jackson CB, Syrjä P, Jokinen T, Matiasek K, Rosati M, Dallabona C, Baruffini E, Quintero I, Arumilli M, Monteuuis G, Donner J, Anttila M, Suomalainen A, Bindoff LA, Lohi H. In-frame deletion in canine PITRM1 is associated with a severe early-onset epilepsy, mitochondrial dysfunction and neurodegeneration. Hum Genet 2021; 140:1593-1609. [PMID: 33835239 PMCID: PMC8519929 DOI: 10.1007/s00439-021-02279-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 03/27/2021] [Indexed: 11/30/2022]
Abstract
We investigated the clinical, genetic, and pathological characteristics of a previously unknown severe juvenile brain disorder in several litters of Parson Russel Terriers. The disease started with epileptic seizures at 6–12 weeks of age and progressed rapidly to status epilepticus and death or euthanasia. Histopathological changes at autopsy were restricted to the brain. There was severe acute neuronal degeneration and necrosis diffusely affecting the grey matter throughout the brain with extensive intraneuronal mitochondrial crowding and accumulation of amyloid-β (Aβ). Combined homozygosity mapping and genome sequencing revealed an in-frame 6-bp deletion in the nuclear-encoded pitrilysin metallopeptidase 1 (PITRM1) encoding for a mitochondrial protease involved in mitochondrial targeting sequence processing and degradation. The 6-bp deletion results in the loss of two amino acid residues in the N-terminal part of PITRM1, potentially affecting protein folding and function. Assessment of the mitochondrial function in the affected brain tissue showed a significant deficiency in respiratory chain function. The functional consequences of the mutation were modeled in yeast and showed impaired growth in permissive conditions and an impaired respiration capacity. Loss-of-function variants in human PITRM1 result in a childhood-onset progressive amyloidotic neurological syndrome characterized by spinocerebellar ataxia with behavioral, psychiatric and cognitive abnormalities. Homozygous Pitrm1-knockout mice are embryonic lethal, while heterozygotes show a progressive, neurodegenerative phenotype characterized by impairment in motor coordination and Aβ deposits. Our study describes a novel early-onset PITRM1-related neurodegenerative canine brain disorder with mitochondrial dysfunction, Aβ accumulation, and lethal epilepsy. The findings highlight the essential role of PITRM1 in neuronal survival and strengthen the connection between mitochondrial dysfunction and neurodegeneration.
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Affiliation(s)
- Marjo K Hytönen
- Department of Medical and Clinical Genetics, University of Helsinki, Helsinki, Finland.,Folkhälsan Research Center, Helsinki, Finland.,Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
| | - Riika Sarviaho
- Department of Medical and Clinical Genetics, University of Helsinki, Helsinki, Finland.,Folkhälsan Research Center, Helsinki, Finland.,Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
| | - Christopher B Jackson
- Department of Biochemistry and Developmental Biology, University of Helsinki, Helsinki, Finland
| | - Pernilla Syrjä
- Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
| | - Tarja Jokinen
- Department of Medical and Clinical Genetics, University of Helsinki, Helsinki, Finland.,Department of Equine and Small Animal Medicine, University of Helsinki, Helsinki, Finland
| | - Kaspar Matiasek
- Faculty of Veterinary Medicine, Centre for Clinical Veterinary Medicine, LMU-Munich, Veterinärstrasse 13, 80539, Munich, Germany
| | - Marco Rosati
- Faculty of Veterinary Medicine, Centre for Clinical Veterinary Medicine, LMU-Munich, Veterinärstrasse 13, 80539, Munich, Germany
| | - Cristina Dallabona
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy
| | - Enrico Baruffini
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy
| | - Ileana Quintero
- Department of Medical and Clinical Genetics, University of Helsinki, Helsinki, Finland.,Folkhälsan Research Center, Helsinki, Finland.,Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
| | - Meharji Arumilli
- Department of Medical and Clinical Genetics, University of Helsinki, Helsinki, Finland.,Folkhälsan Research Center, Helsinki, Finland.,Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
| | - Geoffray Monteuuis
- Department of Biochemistry and Developmental Biology, University of Helsinki, Helsinki, Finland
| | - Jonas Donner
- Wisdom Health (Genoscoper Laboratories), Helsinki, Finland
| | | | - Anu Suomalainen
- Research Programs Unit, Stem Cells and Metabolism Research Program, University of Helsinki, Helsinki, Finland
| | - Laurence A Bindoff
- Department of Clinical Medicine (K1), University of Bergen, Bergen, Norway.,Department of Neurology, Neuro-SysMed, Haukeland University Hospital, Bergen, Norway
| | - Hannes Lohi
- Department of Medical and Clinical Genetics, University of Helsinki, Helsinki, Finland. .,Folkhälsan Research Center, Helsinki, Finland. .,Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland.
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5
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Santos CRO, Gouveia JJDS, Gouveia GV, Bezerra FCM, Nogueira JF, Baraúna Júnior D. Molecular screening for the mutation associated with canine degenerative myelopathy (SOD1:c.118G > A) in German Shepherd dogs in Brazil. PLoS One 2020; 15:e0242347. [PMID: 33196688 PMCID: PMC7668602 DOI: 10.1371/journal.pone.0242347] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 10/30/2020] [Indexed: 12/01/2022] Open
Abstract
Canine Degenerative Myelopathy is a late onset recessive autosomal disease characterized by a progressive ascending degeneration of the spinal cord. Two causal mutations are associated with this disease: a transition (c.118G>A) in exon 2 of the SOD1 that was described in several breeds and a transversion (c.52A>T) in exon 1 of the same gene described in Bernese Mountain dogs. The aim of this study was to understand the impact of the SOD1:c.118G > A mutation by genotyping a population of German Shepherd dogs in Brazil. A PCR-RFLP approach was used to genotype 97 healthy individuals belonging from the Northeast (Bahia and Pernambuco states) and South (Santa Catarina state) regions of Brazil. A total of 95 individuals were successfully genotyped resulting in an observed genotype frequency (with 95% confidence interval) of: 0.758 (0.672–0.844), 0.242 (0.156–0.328) and 0.000 (0.000–0.000) for “GG”, “AG” and “AA” genotypes, respectively. To our knowledge, this is the first attempt to describe the presence of the “A” allele associated with CDM (SOD1:c.118G > A) in German Shepherd dogs in Brazil and, as such, these results contribute toward important epidemiological data in this country and to the knowledge of the distribution of the aforementioned mutation worldwide.
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Affiliation(s)
- Cássia Regina Oliveira Santos
- Postgraduate Program in Veterinary Sciences in the Semiarid, Federal University of Vale do São Francisco, Petrolina, Pernambuco, Brazil
- University Veterinary Clinic, Federal University of Vale do São Francisco, Petrolina, Pernambuco, Brazil
- * E-mail:
| | | | - Gisele Veneroni Gouveia
- Department of Animal Sciences, Federal University of Vale do São Francisco, Pernambuco, Brazil
| | - Flávia Caroline Moreira Bezerra
- Postgraduate Program in Veterinary Sciences in the Semiarid, Federal University of Vale do São Francisco, Petrolina, Pernambuco, Brazil
| | - Joel Fonseca Nogueira
- Postgraduate Program in Veterinary Sciences in the Semiarid, Federal University of Vale do São Francisco, Petrolina, Pernambuco, Brazil
| | - Durval Baraúna Júnior
- Department of Veterinary Medicine, Federal University of Vale do São Francisco, Petrolina, Pernambuco, Brazil
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6
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Santos C, Amude A, Araújo F, Bezerra F, Nogueira J, Gouveia J, Baraúna Júnior D. Achados clínicos, histopatológicos e moleculares da mielopatia degenerativa canina: relato de caso. ARQ BRAS MED VET ZOO 2020. [DOI: 10.1590/1678-4162-11221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
RESUMO Objetivou-se descrever os achados clínicos, histopatológicos e moleculares associados à MDC em um cão da raça Pastor-Suiço. O cão possuía uma paraparesia progressiva em membros pélvicos e foi submetido a avaliações clínicas, pelas quais se obteve, entre outros diferenciais, o diagnóstico presuntivo de MDC. Com a evolução dos sinais, o tutor optou pela eutanásia. Os achados histopatológicos da medula espinhal foram compatíveis com uma degeneração segmentar axonal e mielínica. O diagnóstico molecular foi realizado por meio da extração do DNA obtido por swab oral. Uma PCR foi otimizada utilizando-se primers descritos em literatura para amplificar a região do gene SOD1. A amostra foi, então, submetida a sequenciamento unidirecional, que revelou que o animal em questão era homozigoto para o alelo A para a mutação c.118G>A no éxon 2 do gene SOD1. O diagnóstico clínico presuntivo da MDC no presente caso foi esclarecido por meio dos achados histopatológicos, associados aos achados clínicos, e da sua caracterização molecular. Ressalta-se a contribuição deste relato, que traz aspectos clínicos, histopatológicos e moleculares associados à MDC na raça Pastor-Suíço, para a qual, até o presente momento, na literatura consultada, não há relato dessa enfermidade.
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Affiliation(s)
- C.R.O. Santos
- Universidade Federal do Vale do São Francisco, Brazil
| | | | | | | | - J.F. Nogueira
- Universidade Federal do Vale do São Francisco, Brazil
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7
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Barker EN, Dawson LJ, Rose JH, Van Meervenne S, Frykman O, Rohdin C, Leijon A, Soerensen KE, Järnegren J, Johnson GC, O'Brien DP, Granger N. Degenerative Encephalopathy in Nova Scotia Duck Tolling Retrievers Presenting with a Rapid Eye Movement Sleep Behavior Disorder. J Vet Intern Med 2018; 30:1681-1689. [PMID: 27717189 PMCID: PMC5032881 DOI: 10.1111/jvim.14575] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 07/17/2016] [Accepted: 08/10/2016] [Indexed: 11/30/2022] Open
Abstract
Background Neurodegenerative diseases are a heterogeneous group of disorders characterized by loss of neurons and are commonly associated with a genetic mutation. Hypothesis/Objectives To characterize the clinical and histopathological features of a novel degenerative neurological disease affecting the brain of young adult Nova Scotia Duck Tolling Retrievers (NSDTRs). Animals Nine, young adult, related NSDTRs were evaluated for neurological dysfunction and rapid eye movement sleep behavior disorder. Methods Case series review. Results Clinical signs of neurological dysfunction began between 2 months and 5 years of age and were progressive in nature. They were characterized by episodes of marked movements during sleep, increased anxiety, noise phobia, and gait abnormalities. Magnetic resonance imaging documented symmetrical, progressively increasing, T2‐weighted image intensity, predominantly within the caudate nuclei, consistent with necrosis secondary to gray matter degeneration. Abnormalities were not detected on clinicopathological analysis of blood and cerebrospinal fluid, infectious disease screening or urine metabolite screening in most cases. Postmortem examination of brain tissue identified symmetrical malacia of the caudate nuclei and axonal dystrophy within the brainstem and spinal cord. Genealogical analysis supports an autosomal recessive mode of inheritance. Conclusions and Clinical Importance A degenerative encephalopathy was identified in young adult NSDTRs consistent with a hereditary disease. The prognosis is guarded due to the progressive nature of the disease, which is minimally responsive to empirical treatment.
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Affiliation(s)
- E N Barker
- School of Veterinary Sciences, University of Bristol, Langford, UK.
| | - L J Dawson
- IDEXX Laboratories Ltd Wetherby, West Yorkshire, UK
| | - J H Rose
- School of Veterinary Sciences, University of Bristol, Langford, UK
| | | | | | - C Rohdin
- Department of Clinical Sciences, Swedish University of Agricultural Science, Uppsala, Sweden.,Anicura, Albano Small Animal Hospital, Danderyd, Sweden
| | - A Leijon
- Department of Biomedical Sciences and Veterinary Public Health, Section of Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - K E Soerensen
- Department of Pathology and Wildlife Diseases, National Veterinary Institute (SVA), Uppsala, Sweden
| | - J Järnegren
- Norwegian Institute for Nature Research, Trondheim, Norway
| | - G C Johnson
- Department of Veterinary Medicine & Surgery, University of Missouri, Columbia, MO
| | - D P O'Brien
- Department of Veterinary Medicine & Surgery, University of Missouri, Columbia, MO
| | - N Granger
- School of Veterinary Sciences, University of Bristol, Langford, UK
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8
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Strain GM. A framework for movement disorders in canine neurology. Vet J 2016; 214:122-3. [DOI: 10.1016/j.tvjl.2016.06.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 06/04/2016] [Indexed: 11/30/2022]
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9
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Leeb T, Müller EJ, Roosje P, Welle M. Genetic testing in veterinary dermatology. Vet Dermatol 2016; 28:4-e1. [PMID: 27425028 DOI: 10.1111/vde.12309] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/10/2016] [Indexed: 12/17/2022]
Abstract
BACKGROUND Molecular genetics has made significant advances in the analysis of hereditary dermatoses during the last several years. OBJECTIVES To provide an update on currently available genetic tests for skin diseases of dogs, cats and horses, and to aid the veterinary clinician in the appropriate selection and applications of genetic tests. METHODS The scientific literature on the topic was critically reviewed. The list of known causative variants for genodermatoses and hair morphology traits was compiled by searching the Online Mendelian Inheritance in Animals (OMIA) database. RESULTS Genetic testing has become an important diagnostic method in veterinary medicine. Genetic tests can help to establish the correct diagnosis in some diseases with relatively nonspecific signs. Genetic tests are also essential for sustainable breeding programmes and to help minimize the frequency of animals with hereditary diseases. Advances in genetic methodology and bioinformatics already allow genome-wide screening for potential disease causing mutations for research purposes. It is anticipated that this will become a routine process in clinical practice in the future. CONCLUSION AND CLINICAL IMPORTANCE As specific DNA tests and broad genome-wide analyses come into more common use, it is critical that clinicians understand the proper application and interpretation of these test results.
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Affiliation(s)
- Tosso Leeb
- Vetsuisse Faculty, Institute of Genetics, University of Bern, Bremgartenstrasse 109a, Bern, 3001, Switzerland.,DermFocus, University of Bern, Bremgartenstrasse 109a, Bern, 3001, Switzerland
| | - Eliane J Müller
- DermFocus, University of Bern, Bremgartenstrasse 109a, Bern, 3001, Switzerland.,Vetsuisse Faculty, Institute of Animal Pathology, University of Bern, Länggassstrasse 122, Bern, 3001, Switzerland.,Department of Dermatology, Inselspital, University of Bern, Freiburgstrasse, Bern, 3010, Switzerland
| | - Petra Roosje
- DermFocus, University of Bern, Bremgartenstrasse 109a, Bern, 3001, Switzerland.,Vetsuisse Faculty, Division of Clinical Dermatology, Department of Clinical Veterinary Medicine, University of Bern, Länggassstrasse 128, Bern, 3001, Switzerland
| | - Monika Welle
- DermFocus, University of Bern, Bremgartenstrasse 109a, Bern, 3001, Switzerland.,Vetsuisse Faculty, Institute of Animal Pathology, University of Bern, Länggassstrasse 122, Bern, 3001, Switzerland
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10
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Mhlanga-Mutangadura T, Johnson GS, Ashwini A, Shelton GD, Wennogle SA, Johnson GC, Kuroki K, O'Brien DP. A Homozygous RAB3GAP1:c.743delC Mutation in Rottweilers with Neuronal Vacuolation and Spinocerebellar Degeneration. J Vet Intern Med 2016; 30:813-8. [PMID: 26968732 PMCID: PMC4913561 DOI: 10.1111/jvim.13921] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 12/28/2015] [Accepted: 02/11/2016] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND A variety of presumed hereditary, neurologic diseases have been reported in young Rottweilers. Overlapping ages of onset and clinical signs have made antemortem diagnosis difficult. One of these diseases, neuronal vacuolation and spinocerebellar degeneration (NVSD) shares clinical and histological features with polyneuropathy with ocular abnormalities and neuronal vacuolation (POANV), a recently described hereditary disease in Black Russian Terriers (BRTs). Dogs with POANV harbor mutations in RAB3GAP1 which codes for a protein involved in membrane trafficking. HYPOTHESIS Rottweilers with NVSD will be homozygous for the RAB3GAP1:c.743delC allele associated with POANV in BRTs. ANIMALS Eight Rottweilers with NVSD confirmed at necropsy, 128 Rottweilers without early onset neurologic signs, and 468 randomly selected dogs from 169 other breeds. METHODS Retrospective case-control study. Dogs were genotyped for the RAB3GAP1:c.743delC allele with an allelic discrimination assay. RESULTS All 8 NVSD-affected dogs were homozygous for the RAB3GAP1:c.743delC allele while the 128 NVSD-free Rottweilers were either homozygous for the reference allele (n = 105) or heterozygous (n = 23) and the 468 genotyped dogs from other breeds were all homozygous for the reference allele. CONCLUSIONS AND CLINICAL IMPORTANCE The RAB3GAP1:c.743delC mutation is associated with a similar phenotype in Rottweilers and BRTs. Identification of the mutation permits a DNA test that can aid in the diagnosis of NVSD and identify carriers of the trait so that breeders can avoid producing affected dogs. Disruption of membrane trafficking could explain the neuronal vacuolation seen in NVSD and other spongiform encephalopathies.
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Affiliation(s)
- T Mhlanga-Mutangadura
- Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia, MO
| | - G S Johnson
- Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia, MO
| | - A Ashwini
- Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia, MO
| | - G D Shelton
- Department of Pathology, University of California San Diego, La Jolla, CA
| | - S A Wennogle
- Department of Clinical Sciences, Colorado State University, Fort Collins, CO
| | - G C Johnson
- Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia, MO
| | - K Kuroki
- Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia, MO
| | - D P O'Brien
- Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO
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11
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Jolly RD, Dittmer KE, Blair HT. Animal medical genetics: a perspective on the epidemiology and control of inherited disorders. N Z Vet J 2016; 64:135-44. [DOI: 10.1080/00480169.2015.1129296] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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12
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Tipold A. Grand Challenge Veterinary Neurology and Neurosurgery: Veterinary Neurology and Neurosurgery - Research for Animals and Translational Aspects. Front Vet Sci 2015; 2:13. [PMID: 26664942 PMCID: PMC4672178 DOI: 10.3389/fvets.2015.00013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 05/07/2015] [Indexed: 11/30/2022] Open
Affiliation(s)
- Andrea Tipold
- Department of Small Animal Medicine and Surgery, University of Veterinary Medicine Hannover , Hannover , Germany
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Kyöstilä K, Syrjä P, Jagannathan V, Chandrasekar G, Jokinen TS, Seppälä EH, Becker D, Drögemüller M, Dietschi E, Drögemüller C, Lang J, Steffen F, Rohdin C, Jäderlund KH, Lappalainen AK, Hahn K, Wohlsein P, Baumgärtner W, Henke D, Oevermann A, Kere J, Lohi H, Leeb T. A missense change in the ATG4D gene links aberrant autophagy to a neurodegenerative vacuolar storage disease. PLoS Genet 2015; 11:e1005169. [PMID: 25875846 PMCID: PMC4398399 DOI: 10.1371/journal.pgen.1005169] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 03/20/2015] [Indexed: 11/22/2022] Open
Abstract
Inherited neurodegenerative disorders are debilitating diseases that occur across different species. We have performed clinical, pathological and genetic studies to characterize a novel canine neurodegenerative disease present in the Lagotto Romagnolo dog breed. Affected dogs suffer from progressive cerebellar ataxia, sometimes accompanied by episodic nystagmus and behavioral changes. Histological examination revealed unique pathological changes, including profound neuronal cytoplasmic vacuolization in the nervous system, as well as spheroid formation and cytoplasmic aggregation of vacuoles in secretory epithelial tissues and mesenchymal cells. Genetic analyses uncovered a missense change, c.1288G>A; p.A430T, in the autophagy-related ATG4D gene on canine chromosome 20 with a highly significant disease association (p = 3.8 x 10-136) in a cohort of more than 2300 Lagotto Romagnolo dogs. ATG4D encodes a poorly characterized cysteine protease belonging to the macroautophagy pathway. Accordingly, our histological analyses indicated altered autophagic flux in affected tissues. The knockdown of the zebrafish homologue atg4da resulted in a widespread developmental disturbance and neurodegeneration in the central nervous system. Our study describes a previously unknown canine neurological disease with particular pathological features and implicates the ATG4D protein as an important autophagy mediator in neuronal homeostasis. The canine phenotype serves as a model to delineate the disease-causing pathological mechanism(s) and ATG4D function, and can also be used to explore treatment options. Furthermore, our results reveal a novel candidate gene for human neurodegeneration and enable the development of a genetic test for veterinary diagnostic and breeding purposes. Neurodegenerative disorders affect millions of people worldwide. We describe a novel neurodegenerative disease in a canine model, characterized by progressive cerebellar ataxia and cellular vacuolization. Our genetic analyses identified a single nucleotide change in the autophagy-related ATG4D gene in affected dogs. The ATG4D gene has not been linked to inherited diseases before. The autophagy-lysosome pathway plays an important role in degrading and recycling different cellular components. Disturbed autophagy has been reported in several different diseases but mutations in core autophagy components are rare. Histological analyses of affected canine brain tissues revealed altered autophagic flux, and a knockdown of the gene in the zebrafish model caused marked neurodevelopmental alterations and neurodegeneration. Our findings identify a new disease-causing pathway and implicate the ATG4D protease as an important mediator for neuronal homeostasis. Furthermore, our study establishes a large animal model to investigate the role of ATG4D in autophagy and to test possible treatment options.
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Affiliation(s)
- Kaisa Kyöstilä
- Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
- Research Programs Unit, Molecular Neurology, University of Helsinki, Helsinki, Finland
- Department of Molecular Genetics, Folkhälsan Institute of Genetics, Helsinki, Finland
| | - Pernilla Syrjä
- Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
| | - Vidhya Jagannathan
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | | | - Tarja S. Jokinen
- Department of Equine and Small Animal Medicine, University of Helsinki, Helsinki, Finland
| | - Eija H. Seppälä
- Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
- Research Programs Unit, Molecular Neurology, University of Helsinki, Helsinki, Finland
- Department of Molecular Genetics, Folkhälsan Institute of Genetics, Helsinki, Finland
| | - Doreen Becker
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | | | - Elisabeth Dietschi
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Cord Drögemüller
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Johann Lang
- Department of Clinical Veterinary Medicine, Division of Clinical Radiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Frank Steffen
- Neurology Service, Department of Small Animals, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Cecilia Rohdin
- University Animal Hospital, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Karin H. Jäderlund
- Department of Companion Animal Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Anu K. Lappalainen
- Department of Equine and Small Animal Medicine, University of Helsinki, Helsinki, Finland
| | - Kerstin Hahn
- Department of Pathology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Peter Wohlsein
- Department of Pathology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Wolfgang Baumgärtner
- Department of Pathology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Diana Henke
- Division of Neurological Sciences, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Anna Oevermann
- Division of Neurological Sciences, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Juha Kere
- Research Programs Unit, Molecular Neurology, University of Helsinki, Helsinki, Finland
- Department of Molecular Genetics, Folkhälsan Institute of Genetics, Helsinki, Finland
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
- Science for Life Laboratory, Karolinska Institutet, Solna, Sweden
| | - Hannes Lohi
- Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
- Research Programs Unit, Molecular Neurology, University of Helsinki, Helsinki, Finland
- Department of Molecular Genetics, Folkhälsan Institute of Genetics, Helsinki, Finland
- * E-mail:
| | - Tosso Leeb
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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