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Veronique Deschodt-Arsac, Laurent Arsac, Julie Magat, Jerome Naulin, Bruno Quesson, Pierre Dos Santos
INTRODUCTION: Gradual alterations in cardiac energy balance, as assessed by the myocardial PCr/ATP-ratio, are frequently associated with the development of cardiac disease. Despite great interest for the follow-up of myocardial PCr and ATP content, cardiac MR-spectroscopy in rat models in vivo is challenged by sensitivity issues and cross-contamination from other organs. METHODS: Here we combined MR-Imaging and MR-Spectroscopy (Bruker BioSpec 9.4T) to follow-up for the first time in vivo the cardiac energy balance in the SHR, a genetic rat model of cardiac hypertrophy known to develop early disturbances in cytosolic calcium dynamics...
2016: PloS One
Victoria Girard, Sandrine Mailler, Martin Welker, Maud Arsac, Béatrice Cellière, Pierre-Jean Cotte-Pattat, Sonia Chatellier, Géraldine Durand, Anne-Marie Béni, Jacques Schrenzel, Elizabeth Miller, Rahima Dussoulier, W Michael Dunne, Susan Butler-Wu, Michael A Saubolle, Den Sussland, Melissa Bell, Alex van Belkum, Parampal Deol
Identification of microorganisms by MALDI-TOF MS has been widely accepted in clinical microbiology. However, for Mycobacterium spp. and Nocardia spp. such identification has not yet reached the optimal level of routine testing. Here we describe the development of an identification tool for 49 and 15 species of Mycobacterium spp. and Nocardia spp., respectively. During database construction, a number of ambiguous reference identifications were revealed and corrected via molecular analyses. Eventually, more than 2000 individual mass spectra acquired from 494 strains were included in a reference database and subjected to bio-statistical analyses...
November 2016: Diagnostic Microbiology and Infectious Disease
C Tranchant, M Anheim
Mitochondrial diseases (MIDs) are a large group of heterogeneous disorders due to mutations in either mitochondrial DNA (mtDNA) or nuclear DNA (nDNA) genes, the latter encoding proteins involved in mitochondrial function. A multisystem clinical picture that involves several organs, including both the peripheral and central nervous systems, is a common presentation of MID. Movement disorders, even isolated ones, are not rare. Cerebellar ataxia is common in myoclonic epilepsy with ragged red fibers (MERFF) due to mutations in the mitochondrial transfer RNA (tRNA) lysine gene, in Kearns-Sayre syndrome due to mtDNA deletions, in sensory ataxic neuropathy with dysarthria and ophthalmoplegia (SANDO) due to nuclear POLG1 gene mutations, and also in ARCA2, Friedreich's ataxia, SPG7, SCA28 and autosomal-recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) due to mutations in nuclear genes involved in mitochondrial morphology or function...
August 2016: Revue Neurologique
Fábio A Nascimento, Laura Canafoglia, Danah Aljaafari, Mikko Muona, Anna-Elina Lehesjoki, Samuel F Berkovic, Silvana Franceschetti, Danielle M Andrade
Pathogenic variants in the SACS gene (OMIM #604490) cause autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS). ARSACS is a neurodegenerative early-onset progressive disorder, originally described in French Canadians, but later observed elsewhere.(1) Whole-exome sequencing of a large group of patients with unclassified progressive myoclonus epilepsies (PMEs) identified 2 patients bearing SACS gene mutations.(2) We detail the PME clinical features associated with SACS mutations and suggest the inclusion of the SACS gene in diagnostic screening of PMEs...
August 2016: Neurology. Genetics
Christine M Armour, Amanda Smith, Taila Hartley, Jodi Warman Chardon, Sarah Sawyer, Jeremy Schwartzentruber, Raoul Hennekam, Jacek Majewski, Dennis E Bulman, Mohnish Suri, Kym M Boycott
In 1987 Fitzsimmons and Guilbert described identical male twins with progressive spastic paraplegia, brachydactyly with cone shaped epiphyses, short stature, dysarthria, and "low-normal" intelligence. In subsequent years, four other patients, including one set of female identical twins, a single female child, and a single male individual were described with the same features, and the eponym Fitzsimmons syndrome was adopted (OMIM #270710). We performed exome analysis of the patient described in 2009, and one of the original twins from 1987, the only patients available from the literature...
July 2016: American Journal of Medical Genetics. Part A
L Liu, X B Li, X H Zi, L Shen, Zh M Hu, Sh X Huang, D L Yu, H B Li, K Xia, B S Tang, R X Zhang
The array of autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) has expanded worldwide after the first description in the Charlevoix-Saguenay region of Québec. Here, we report a Chinese ARSACS patient presenting progressive peripheral neuropathy (CMTNS2=15) with horizontal gaze nystagmus and mild spastic gait. Genetic studies including whole exome sequencing (WES), Sanger sequencing and single nucleotide polymorphism (SNP) array analysis revealed a novel hemizygous nonsense mutation (c.11803C>T, p...
March 15, 2016: Journal of the Neurological Sciences
Christopher T Shah, Tyson S Ward, Julie A Matsumoto, Yevgeniy Shildkrot
A 14-year-old boy presented with a presumed diagnosis of autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS). The neurological examination, nerve conduction study, and brain imaging results were all consistent with the diagnosis. The ophthalmologic examination was notable for a prominent myelinated nerve fiber layer extending from the disk along the major temporal arcades in both eyes. Loss of foveal depression was noted clinically and on spectral domain optical coherence tomography. This case highlights a novel finding that may aid in the diagnosis of ARSACS...
February 2016: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
Chiara Criscuolo, C Procaccini, M C Meschini, A Cianflone, R Carbone, S Doccini, D Devos, C Nesti, I Vuillaume, M Pellegrino, A Filla, G De Michele, G Matarese, F M Santorelli
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is a neurodegenerative disease due to mutations in SACS, which encodes sacsin, a protein localized on the mitochondrial surface and possibly involved in mitochondrial dynamics. In view of the possible mitochondrial involvement of sacsin, we investigated mitochondrial activity at functional and molecular level in skin fibroblasts obtained from ARSACS patients. We observed remarkable bioenergetic damage in ARSACS cells, as indicated by reduced basal, adenosine triphosphate (ATP)-linked and maximal mitochondrial respiration rate, and by reduced respiratory chain activities and mitochondrial ATP synthesis...
December 2015: Journal of Neurology
Xinlu Li, Marie Ménade, Guennadi Kozlov, Zheping Hu, Zheng Dai, Peter S McPherson, Bernard Brais, Kalle Gehring
Sacsin is a large protein implicated in the neurodevelopmental and neurodegenerative disease autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS), which features the loss of Purkinje neurons in the cerebellum. Although the domain architecture of sacsin suggests that it is a neuronal chaperone assisting in protein quality control, the precise function of sacsin remains elusive. Using fluorescence polarization (FP) assays, we confirmed that the HEPN domain of sacsin binds to nucleotides with low micromolar affinities...
2015: PloS One
Julie Pilliod, Sébastien Moutton, Julie Lavie, Elise Maurat, Christophe Hubert, Nadège Bellance, Mathieu Anheim, Sylvie Forlani, Fanny Mochel, Karine N'Guyen, Christel Thauvin-Robinet, Christophe Verny, Dan Milea, Gaëtan Lesca, Michel Koenig, Diana Rodriguez, Nada Houcinat, Julien Van-Gils, Christelle M Durand, Agnès Guichet, Magalie Barth, Dominique Bonneau, Philippe Convers, Elisabeth Maillart, Lucie Guyant-Marechal, Didier Hannequin, Guillaume Fromager, Alexandra Afenjar, Sandra Chantot-Bastaraud, Stéphanie Valence, Perrine Charles, Patrick Berquin, Caroline Rooryck, Julie Bouron, Alexis Brice, Didier Lacombe, Rodrigue Rossignol, Giovanni Stevanin, Giovanni Benard, Lydie Burglen, Alexandra Durr, Cyril Goizet, Isabelle Coupry
OBJECTIVE: Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is caused by mutations in the SACS gene. SACS encodes sacsin, a protein whose function remains unknown, despite the description of numerous protein domains and the recent focus on its potential role in the regulation of mitochondrial physiology. This study aimed to identify new mutations in a large population of ataxic patients and to functionally analyze their cellular effects in the mitochondrial compartment...
December 2015: Annals of Neurology
Lubov Blumkin, Teisha Bradshaw, Marina Michelson, Tal Kopler, Dvir Dahari, Tally Lerman-Sagie, Dorit Lev, J Paul Chapple, Esther Leshinsky-Silver
BACKGROUND: ARSACS (autosomal-recessive spastic ataxia of Charlevoix-Saguenay) is a neurodegenerative disorder caused by SACS gene mutations and characterized by a triad of symptoms: early-onset cerebellar ataxia, spasticity and peripheral neuropathy. A characteristic retinal nerve fiber hypertrophy has been reported in several individuals with ARSACS. METHODS: We describe a patient with a unique clinical presentation of ataxia, nystagmus, dysarthria, hearing impairment, and retinal degeneration...
July 2015: European Journal of Paediatric Neurology: EJPN
Philippe Diolez, Véronique Deschodt-Arsac, Guillaume Calmettes, Gilles Gouspillou, Laurent Arsac, Pierre Dos Santos, Pierre Jais, Michel Haissaguerre
The more recent studies of human pathologies have essentially revealed the complexity of the interactions involved at the different levels of integration in organ physiology. Integrated organ thus reveals functional properties not predictable by underlying molecular events. It is therefore obvious that current fine molecular analyses of pathologies should be fruitfully combined with integrative approaches of whole organ function. It follows an important issue in the comprehension of the link between molecular events in pathologies, and whole organ function/dysfunction is the development of new experimental strategies aimed at the study of the integrated organ physiology...
2015: Methods in Molecular Biology
Patricia Reant, Amelie Reynaud, Xavier Pillois, Marina Dijos, Florence Arsac, Cecile Touche, Mathieu Landelle, Caroline Rooryck, Raymond Roudaut, Stephane Lafitte
BACKGROUND: Both resting echocardiography and exercise echocardiography produce variables predictive of outcomes in patients with hypertrophic cardiomyopathy (HCM). The aim of the present study was to compare the respective value of resting and exercise echocardiographic parameters as indicators of clinical outcomes in patients with HCM. METHODS: Resting and exercise echocardiography was performed prospectively in patients with HCM evaluated at the HCM Competence Center of Bordeaux and followed up every 6 months...
February 2015: Journal of the American Society of Echocardiography
Cynthia Gagnon, Caroline Lavoie, Isabelle Lessard, Jean Mathieu, Bernard Brais, Jean-Pierre Bouchard, Marie-Christine Fluet, Roger Gassert, Olivier Lambercy
OBJECTIVE: This paper introduces a novel assessment tool to provide clinicians with quantitative and more objective measures of upper limb coordination in patients suffering from Autosomal Recessive Spastic Ataxia of Charlevoix-Saguenay (ARSACS). The Virtual Peg Insertion Test (VPIT) involves manipulating an instrumented handle in order to move nine pegs into nine holes displayed in a virtual environment. The main outcome measures were the number of zero-crossings of the hand acceleration vector, as a measure of movement coordination and the total time required to complete the insertion of the nine pegs, as a measure of overall upper limb performance...
December 15, 2014: Journal of the Neurological Sciences
Sophie De Respinis, Valérie Monnin, Victoria Girard, Martin Welker, Maud Arsac, Béatrice Cellière, Géraldine Durand, Philipp P Bosshard, Claudio Farina, Marco Passera, Alex Van Belkum, Orlando Petrini, Mauro Tonolla
The objective of this research was to extend the Vitek MS fungal knowledge base version 2.0.0 to allow the robust identification of clinically relevant dermatophytes, using a variety of strains, incubation times, and growth conditions. First, we established a quick and reliable method for sample preparation to obtain a reliable and reproducible identification independently of the growth conditions. The Vitek MS V2.0.0 fungal knowledge base was then expanded using 134 well-characterized strains belonging to 17 species in the genera Epidermophyton, Microsporum, and Trichophyton...
December 2014: Journal of Clinical Microbiology
Yoshihisa Takiyama
Japan Spastic Paraplegia Research Consortium (JASPAC), a nationwide clinical and genetic survey of patients with hereditary spastic paraplegia (HSP), was started in 2006 as a project of the Research Committee for Ataxic Diseases of the Ministry of Health, Labor, and Welfare, Japan. To date (April 4, 2014), 448 indexed patients with HSP have been registered from 46 prefectures in Japan. We are now performing molecular testing of the HSP patients using Sanger sequencing (SPG4, SPG11, SPG31, and ARSACS), comparative genomic hybridization (CGH) array (SPG1, 2, 3A, 4, 5, 6, 7, 8, 10, 11, 13, 15, 17, 20, 21, 31, 33, 39, 42, ABCD1, alsin, and ARSACS), and resequencing microarray (SPG1, 2, 3A, 4, 5, 6, 7, 8, 10, 11, 13, 17, 20, 21, 31, 33, and ABCD1)...
October 2014: Brain and Nerve, Shinkei Kenkyū No Shinpo
Roxanne Larivière, Rébecca Gaudet, Benoit J Gentil, Martine Girard, Talita Cristiane Conte, Sandra Minotti, Kim Leclerc-Desaulniers, Kalle Gehring, R Anne McKinney, Eric A Shoubridge, Peter S McPherson, Heather D Durham, Bernard Brais
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS [MIM 270550]) is an early-onset neurodegenerative disorder caused by mutations in the SACS gene. Over 170 SACS mutations have been reported worldwide and are thought to cause loss of function of sacsin, a poorly characterized and massive 520 kDa protein. To establish an animal model and to examine the pathophysiological basis of ARSACS, we generated Sacs knockout (Sacs(-/-)) mice. Null animals displayed an abnormal gait with progressive motor, cerebellar and peripheral nerve dysfunctions highly reminiscent of ARSACS...
February 1, 2015: Human Molecular Genetics
Jacqueline A Leavitt, Wolfgang Singer, William L Brown, Jose S Pulido, Michael C Brodsky
A 39-year-old man with long-standing ataxia, spasticity, dysarthria, and peripheral neuropathy was found to have diffuse thickening of the retinal nerve fiber layer in both eyes, as manifested by prominent retinal striations and confirmed by optical coherence tomography. Magnetic resonance imaging showed severe atrophy of the superior cerebellar vermis with linear "footprint" hypointensities in the pons with irregular striations. Genetic testing confirmed the diagnosis of spastic ataxia of Charlevoix-Saguenay (ARSACS)...
December 2014: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
Gwenaël Le Moal, Thierry Prazuck, Mariam Saberan-Roncato, Joëlle Julien, Thierry Pasdeloup, Jean-Michel Descamps, Marc Lestelle, Philippe Arsac, Elise Champeaux-Orange, Lydia Bouaraba, Laurent Hocqueloux
BACKGROUND: Patients living with HIV (PLHIV) are increasingly being affected by cancer. However, data evaluating the long-term impact of cancer treatment on HIV course are sparse. METHODS: To determine whether anticancer treatments detrimentally impact HIV course, we conducted a retrospective cohort study in seven hospitals in France. Adult PLHIV treated for haematological or solid malignancies were included and compared (1:1) with suitably matched (cancer-free) controls...
January 2015: Journal of Antimicrobial Chemotherapy
Elsdon Storey
This review broadly covers the commoner genetic ataxias, concentrating on their clinical features. Over the last two decades there has been a potentially bewildering profusion of newly described genetic ataxias. However, at least half of dominant ataxias (SCAs) are caused by (CAG)n repeat expansions resulting in expanded polyglutamine tracts (SCAs 1, 2, 3, 6, 7, 17, and DRPLA), although of the remainder only SCAs 8, 10, 12, 14, 15/16, and 31 are frequent enough that the described phenotype is probably representative...
July 2014: Seminars in Neurology
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