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Valdivia MP, Veloso F, Stutman D, Stoeckl C, Mileham C, Begishev IA, Theobald W, Vescovi M, Useche W, Regan SP, Albertazzi B, Rigon G, Mabey P, Michel T, Pikuz SA, Koenig M, Casner A. X-ray backlighter requirements for refraction-based electron density diagnostics through Talbot-Lau deflectometry. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10G127. [PMID: 30399908 DOI: 10.1063/1.5039342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 09/08/2018] [Indexed: 06/08/2023]
Abstract
Talbot-Lau x-ray interferometers can map electron density gradients in High Energy Density (HED) samples. In the deflectometer configuration, it can provide refraction, attenuation, elemental composition, and scatter information from a single image. X-ray backlighters in Talbot-Lau deflectometry must meet specific requirements regarding source size and x-ray spectra, amongst others, to accurately diagnose a wide range of HED experiments. 8 keV sources produced in the high-power laser and pulsed power environment were evaluated as x-ray backlighters for Talbot-Lau x-ray deflectometry. In high-power laser experiments, K-shell emission was produced by irradiating copper targets (500 × 500 × 12.5 μm3 foils, 20 μm diameter wire, and >10 μm diameter spheres) with 30 J, 8-30 ps laser pulses and a 25 μm copper wire with a 60 J, 10 ps laser pulse. In the pulsed power environment, single (2 × 40 μm) and double (4 × 25 μm) copper x-pinches were driven at ∼1 kA/ns. Moiré fringe formation was demonstrated for all x-ray sources explored, and detector performance was evaluated for x-ray films, x-ray CCDs, and imaging plates in context of spatial resolution, x-ray emission, and fringe contrast.
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Bergougnoux A, Bareil C, Thèze C, Sasorith S, Audrézet MP, Férec C, Bienvenu T, Girodon E, Heller M, Fanen P, Mekki C, Bieth E, Fergelot P, Gaston V, Reboul MP, Winter ML, Kitzis A, Thoreau V, Becq F, Lalau G, Pagin A, Malinge MC, Lemonnier L, Koenig M, Claustres M, Raynal C. WS17.1 The multi-faceted nature of CFTR exonic mutations: impact on their functional classification. J Cyst Fibros 2018. [DOI: 10.1016/s1569-1993(18)30214-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Ramaekers VT, Segers K, Sequeira JM, Koenig M, Van Maldergem L, Bours V, Kornak U, Quadros EV. Genetic assessment and folate receptor autoantibodies in infantile-onset cerebral folate deficiency (CFD) syndrome. Mol Genet Metab 2018; 124:87-93. [PMID: 29661558 DOI: 10.1016/j.ymgme.2018.03.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 03/01/2018] [Accepted: 03/02/2018] [Indexed: 01/08/2023]
Abstract
INTRODUCTION Cerebral folate deficiency (CFD) syndromes are defined as neuro-psychiatric conditions with low CSF folate and attributed to different causes such as autoantibodies against the folate receptor-alpha (FR) protein that can block folate transport across the choroid plexus, FOLR1 gene mutations or mitochondrial disorders. High-dose folinic acid treatment restores many neurologic deficits. STUDY AIMS AND METHODS Among 36 patients from 33 families the infantile-onset CFD syndrome was diagnosed based on typical clinical features and low CSF folate. All parents were healthy. Three families had 2 affected siblings, while parents from 4 families were first cousins. We analysed serum FR autoantibodies and the FOLR1 and FOLR2 genes. Among three consanguineous families homozygosity mapping attempted to identify a monogenetic cause. Whole exome sequencing (WES) was performed in the fourth consanguineous family, where two siblings also suffered from polyneuropathy as an atypical finding. RESULTS Boys (72%) outnumbered girls (28%). Most patients (89%) had serum FR autoantibodies fluctuating over 5-6 weeks. Two children had a genetic FOLR1 variant without pathological significance. Homozygosity mapping failed to detect a single autosomal recessive gene. WES revealed an autosomal recessive polynucleotide kinase 3´phosphatase (PNKP) gene abnormality in the siblings with polyneuropathy. DISCUSSION Infantile-onset CFD was characterized by serum FR autoantibodies as its predominant pathology whereas pathogenic FOLR1 gene mutations were absent. Homozygosity mapping excluded autosomal recessive inheritance of any single responsible gene. WES in one consanguineous family identified a PNKP gene abnormality that explained the polyneuropathy and also its contribution to the infantile CFD syndrome because the PNKP gene plays a dual role in both neurodevelopment and immune-regulatory function. Further research for candidate genes predisposing to FRα-autoimmunity is suggested to include X-chromosomal and non-coding DNA regions.
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Tzeferacos P, Rigby A, Bott AFA, Bell AR, Bingham R, Casner A, Cattaneo F, Churazov EM, Emig J, Fiuza F, Forest CB, Foster J, Graziani C, Katz J, Koenig M, Li CK, Meinecke J, Petrasso R, Park HS, Remington BA, Ross JS, Ryu D, Ryutov D, White TG, Reville B, Miniati F, Schekochihin AA, Lamb DQ, Froula DH, Gregori G. Laboratory evidence of dynamo amplification of magnetic fields in a turbulent plasma. Nat Commun 2018; 9:591. [PMID: 29426891 PMCID: PMC5807305 DOI: 10.1038/s41467-018-02953-2] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 01/09/2018] [Indexed: 11/25/2022] Open
Abstract
Magnetic fields are ubiquitous in the Universe. The energy density of these fields is typically comparable to the energy density of the fluid motions of the plasma in which they are embedded, making magnetic fields essential players in the dynamics of the luminous matter. The standard theoretical model for the origin of these strong magnetic fields is through the amplification of tiny seed fields via turbulent dynamo to the level consistent with current observations. However, experimental demonstration of the turbulent dynamo mechanism has remained elusive, since it requires plasma conditions that are extremely hard to re-create in terrestrial laboratories. Here we demonstrate, using laser-produced colliding plasma flows, that turbulence is indeed capable of rapidly amplifying seed fields to near equipartition with the turbulent fluid motions. These results support the notion that turbulent dynamo is a viable mechanism responsible for the observed present-day magnetization.
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Ehret M, Carré G, Koenig M, Cribier B, Tranchant C, Lenormand C. Xeroderma pigmentosum de type F une génodermatose sous-diagnostiquée ? Ann Dermatol Venereol 2017. [DOI: 10.1016/j.annder.2017.09.411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Baux D, Vaché C, Blanchet C, Willems M, Baudoin C, Moclyn M, Faugère V, Touraine R, Isidor B, Dupin-Deguine D, Nizon M, Vincent M, Mercier S, Calais C, García-García G, Azher Z, Lambert L, Perdomo-Trujillo Y, Giuliano F, Claustres M, Koenig M, Mondain M, Roux AF. Combined genetic approaches yield a 48% diagnostic rate in a large cohort of French hearing-impaired patients. Sci Rep 2017; 7:16783. [PMID: 29196752 PMCID: PMC5711943 DOI: 10.1038/s41598-017-16846-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 11/17/2017] [Indexed: 11/22/2022] Open
Abstract
Hearing loss is the most common sensory disorder and because of its high genetic heterogeneity, implementation of Massively Parallel Sequencing (MPS) in diagnostic laboratories is greatly improving the possibilities of offering optimal care to patients. We present the results of a two-year period of molecular diagnosis that included 207 French families referred for non-syndromic hearing loss. Our multi-step strategy involved (i) DFNB1 locus analysis, (ii) MPS of 74 genes, and (iii) additional approaches including Copy Number Variations, in silico analyses, minigene studies coupled when appropriate with complete gene sequencing, and a specific assay for STRC. This comprehensive screening yielded an overall diagnostic rate of 48%, equally distributed between DFNB1 (24%) and the other genes (24%). Pathogenic genotypes were identified in 19 different genes, with a high prevalence of GJB2, STRC, MYO15A, OTOF, TMC1, MYO7A and USH2A. Involvement of an Usher gene was reported in 16% of the genotyped cohort. Four de novo variants were identified. This study highlights the need to develop several molecular approaches for efficient molecular diagnosis of hearing loss, as this is crucial for genetic counselling, audiological rehabilitation and the detection of syndromic forms.
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Koenig M, Amann J, Oakes C, Kaufman J, Carbone D. P2.02-067 LKB1 Loss Is Associated with DNA Hypomethylation in Human Lung Adenocarcinoma. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Lacourt D, Yauy K, Walther-Louvier U, Juntas-Morales R, Cances C, Espil C, Sole G, Arné-Bes M, Cintas P, Uro-coste E, Negrier MM, Rigau V, Bieth E, Goizet C, Koenig M, Rivier F, Cossée M. Efficiency of next generation sequencing of a large panel of genes for diagnosis of children with myopathies and muscular dystrophies, especially for early and/or typical cases. Neuromuscul Disord 2017. [DOI: 10.1016/j.nmd.2017.06.369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Antonelli L, Atzeni S, Schiavi A, Baton SD, Brambrink E, Koenig M, Rousseaux C, Richetta M, Batani D, Forestier-Colleoni P, Le Bel E, Maheut Y, Nguyen-Bui T, Ribeyre X, Trela J. Laser-driven shock waves studied by x-ray radiography. Phys Rev E 2017; 95:063205. [PMID: 28709273 DOI: 10.1103/physreve.95.063205] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Indexed: 06/07/2023]
Abstract
Multimegabar laser-driven shock waves are unique tools for studying matter under extreme conditions. Accurate characterization of shocked matter is for instance necessary for measurements of equation of state data or opacities. This paper reports experiments performed at the LULI facility on the diagnosis of shock waves, using x-ray-absorption radiography. Radiographs are analyzed using standard Abel inversion. In addition, synthetic radiographs, which also take into account the finite size of the x-ray source, are generated using density maps produced by hydrodynamic simulations. Reported data refer to both plane cylindrical targets and hemispherical targets. Evolution and deformation of the shock front could be followed using hydrodynamic simulations.
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Ross JS, Higginson DP, Ryutov D, Fiuza F, Hatarik R, Huntington CM, Kalantar DH, Link A, Pollock BB, Remington BA, Rinderknecht HG, Swadling GF, Turnbull DP, Weber S, Wilks S, Froula DH, Rosenberg MJ, Morita T, Sakawa Y, Takabe H, Drake RP, Kuranz C, Gregori G, Meinecke J, Levy MC, Koenig M, Spitkovsky A, Petrasso RD, Li CK, Sio H, Lahmann B, Zylstra AB, Park HS. Transition from Collisional to Collisionless Regimes in Interpenetrating Plasma Flows on the National Ignition Facility. PHYSICAL REVIEW LETTERS 2017; 118:185003. [PMID: 28524679 DOI: 10.1103/physrevlett.118.185003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Indexed: 06/07/2023]
Abstract
A study of the transition from collisional to collisionless plasma flows has been carried out at the National Ignition Facility using high Mach number (M>4) counterstreaming plasmas. In these experiments, CD-CD and CD-CH planar foils separated by 6-10 mm are irradiated with laser energies of 250 kJ per foil, generating ∼1000 km/s plasma flows. Varying the foil separation distance scales the ion density and average bulk velocity and, therefore, the ion-ion Coulomb mean free path, at the interaction region at the midplane. The characteristics of the flow interaction have been inferred from the neutrons and protons generated by deuteron-deuteron interactions and by x-ray emission from the hot, interpenetrating, and interacting plasmas. A localized burst of neutrons and bright x-ray emission near the midpoint of the counterstreaming flows was observed, suggesting strong heating and the initial stages of shock formation. As the separation of the CD-CH foils increases we observe enhanced neutron production compared to particle-in-cell simulations that include Coulomb collisions, but do not include collective collisionless plasma instabilities. The observed plasma heating and enhanced neutron production is consistent with the initial stages of collisionless shock formation, mediated by the Weibel filamentation instability.
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Carré G, Marelli C, Anheim M, Geny C, Renaud M, Rezvani HR, Koenig M, Guissart C, Tranchant C. Xeroderma pigmentosum complementation group F: A rare cause of cerebellar ataxia with chorea. J Neurol Sci 2017; 376:198-201. [PMID: 28431612 DOI: 10.1016/j.jns.2017.03.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 03/13/2017] [Accepted: 03/14/2017] [Indexed: 10/20/2022]
Abstract
The complementation group F of Xeroderma pigmentosum (XP-F) is rare in the Caucasian population, and usually devoid of neurological symptoms. We report two cases, both Caucasian, who exhibited progressive cerebellar ataxia, chorea, a mild subcortical frontal cognitive impairment, and in one case severe polyneuropathy. Brain MRI demonstrated cerebellar (2/2) and cortical (1/2) atrophy. Both patients had only mild sunburn sensitivity and no skin cancer. Mini-exome sequencing approach revealed in ERCC4, two heterozygous mutations, one of which was never described (c.580-584+1delCCAAGG, exon 3), in the first case, and an already reported homozygous mutation, in the second case. These cases emphasize that XP-F is a rare cause of recessive cerebellar ataxia and can in some cases clinically mimic Huntington's disease due to chorea and executive impairment. The association of ataxia, chorea, and sun hypersensitivity are major guidance for the diagnosis, which should not be missed, in order to prevent skin neoplastic complications.
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Li CK, Tzeferacos P, Lamb D, Gregori G, Norreys PA, Rosenberg MJ, Follett RK, Froula DH, Koenig M, Seguin FH, Frenje JA, Rinderknecht HG, Sio H, Zylstra AB, Petrasso RD, Amendt PA, Park HS, Remington BA, Ryutov DD, Wilks SC, Betti R, Frank A, Hu SX, Sangster TC, Hartigan P, Drake RP, Kuranz CC, Lebedev SV, Woolsey NC. Scaled laboratory experiments explain the kink behaviour of the Crab Nebula jet. Nat Commun 2016; 7:13081. [PMID: 27713403 PMCID: PMC5059765 DOI: 10.1038/ncomms13081] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 08/31/2016] [Indexed: 11/09/2022] Open
Abstract
The remarkable discovery by the Chandra X-ray observatory that the Crab nebula's jet periodically changes direction provides a challenge to our understanding of astrophysical jet dynamics. It has been suggested that this phenomenon may be the consequence of magnetic fields and magnetohydrodynamic instabilities, but experimental demonstration in a controlled laboratory environment has remained elusive. Here we report experiments that use high-power lasers to create a plasma jet that can be directly compared with the Crab jet through well-defined physical scaling laws. The jet generates its own embedded toroidal magnetic fields; as it moves, plasma instabilities result in multiple deflections of the propagation direction, mimicking the kink behaviour of the Crab jet. The experiment is modelled with three-dimensional numerical simulations that show exactly how the instability develops and results in changes of direction of the jet. The periodical change of the Crab nebula's jet direction challenges our understanding of astrophysical jet dynamics. Here the authors use high-power lasers to create a jet that can be directly compared to the Crab nebula's, and report the detection of plasma instabilities that mimic kink behaviour.
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Lankford J, Numan M, Adejumo R, Martinez R, Von Allmen G, Koenig M, Butler I. Vagal Nerve Stimulation in Autonomic Dysfunction – A Case Study. Auton Neurosci 2015. [DOI: 10.1016/j.autneu.2015.07.094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Byrgazov K, Kastner R, Gorna M, Hoermann G, Koenig M, Lucini CB, Ulreich R, Benesch M, Strenger V, Lackner H, Schwinger W, Sovinz P, Haas OA, van den Heuvel-Eibrink M, Niemeyer CM, Hantschel O, Valent P, Superti-Furga G, Urban C, Dworzak MN, Lion T. NDEL1-PDGFRB fusion gene in a myeloid malignancy with eosinophilia associated with resistance to tyrosine kinase inhibitors. Leukemia 2015; 31:237-240. [PMID: 27573554 PMCID: PMC5220134 DOI: 10.1038/leu.2016.250] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Thfoin I, Reverdin C, Hulin S, Szabo CI, Bastiani-Ceccotti S, Batani D, Brambrink E, Koenig M, Duval A, Leboeuf X, Lecherbourg L, Rossé B, Morace A, Santos JJ, Vaisseau X, Fourment C, Giuffrida L, Nakatsutsumi M. Publisher's Note: "Monte-Carlo simulation of noise in hard X-ray Transmission Crystal Spectrometers: Identification of contributors to the background noise and shielding optimization" [Rev. Sci. Instrum. 85, 11D615 (2014)]. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2015; 86:049901. [PMID: 25933909 DOI: 10.1063/1.4916900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Corlobé A, Taithe F, Clavelou P, Pierre E, Carra-Dallière C, Ayrignac X, Mouzat K, Lumbroso S, Menjot de Champfleur N, Koenig M, Boespflug-Tanguy O, Labauge P. A novel autosomal dominant leukodystrophy with specific MRI pattern. J Neurol 2015; 262:988-91. [PMID: 25683759 DOI: 10.1007/s00415-015-7660-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 01/28/2015] [Accepted: 01/29/2015] [Indexed: 01/15/2023]
Abstract
Etiologic diagnosis of adulthood leukodystrophy is challenging in neurologic practice. We describe here the clinico-radiological features of a novel autosomal dominant leukodystrophy in a single family. Clinical and MRI features were recorded in a three generation family. Exome sequencing was performed in two affected relatives and one healthy member. Four total relatives (3 women and 1 man, mean age at onset: 45, range 32-59) were followed: 2 for migraine and 2 for cognitive loss. MRI features were homogeneous in the four affected relatives: extensive and symmetrical white matter hyperintensities on T2-weighted images, with a posterior predominance, involvement of the middle cerebellar peduncles, corpus callosum and the posterior limb of the internal capsules. An extensive metabolic screening was negative. In addition, sequencing of pathogenic genes involved in dominant leukodystrophies (NOTCH3, LMNB1, GFAP, CSF1R) was negative. No mutation has been identified yet with exome sequencing. This report is peculiar because of dominant inheritance, adult onset, highly homogeneous white matter hyperintensities on T2-weighted MR images, predominant in the middle cerebellar peduncles and posterior part of internal capsule and absence of mutation of the genes involved in dominant leukodystrophies.
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Thfoin I, Reverdin C, Hulin S, Szabo CI, Bastiani-Ceccotti S, Batani D, Brambrink E, Koenig M, Duval A, Leboeuf X, Lecherbourg L, Rossé B, Morace A, Santos JJ, Vaisseau X, Fourment C, Giuffrida L, Nakatsutsumi M. Monte-Carlo simulation of noise in hard X-ray Transmission Crystal Spectrometers: identification of contributors to the background noise and shielding optimization. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11D615. [PMID: 25430191 DOI: 10.1063/1.4890534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Transmission crystal spectrometers (TCS) are used on many laser facilities to record hard X-ray spectra. During experiments, signal recorded on imaging plates is often degraded by a background noise. Monte-Carlo simulations made with the code GEANT4 show that this background noise is mainly generated by diffusion of MeV electrons and very hard X-rays. An experiment, carried out at LULI2000, confirmed that the use of magnets in front of the diagnostic, that bent the electron trajectories, reduces significantly this background. The new spectrometer SPECTIX (Spectromètre PETAL à Cristal en TransmIssion X), built for the LMJ/PETAL facility, will include this optimized shielding.
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Denoeud A, Benuzzi-Mounaix A, Ravasio A, Dorchies F, Leguay PM, Gaudin J, Guyot F, Brambrink E, Koenig M, Le Pape S, Mazevet S. Metallization of warm dense SiO(2) studied by XANES spectroscopy. PHYSICAL REVIEW LETTERS 2014; 113:116404. [PMID: 25259992 DOI: 10.1103/physrevlett.113.116404] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Indexed: 06/03/2023]
Abstract
We investigate the evolution of the electronic structure of fused silica in a dense plasma regime using time-resolved x-ray absorption spectroscopy. We use a nanosecond (ns) laser beam to generate a strong uniform shock wave in the sample and a picosecond (ps) pulse to produce a broadband x-ray source near the Si K edge. By varying the delay between the two laser beams and the intensity of the ns beam, we explore a large thermodynamical domain with densities varying from 1 to 5 g/cm^{3} and temperatures up to 5 eV. In contrast to normal conditions where silica is a well-known insulator with a wide band gap of 8.9 eV, we find that shocked silica exhibits a pseudogap as a semimetal throughout this thermodynamical domain. This is in quantitative agreement with density functional theory predictions performed using the generalized gradient approximation.
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Guissart C, Li X, Leheup B, Drouot N, Montaut-Verient B, Raffo E, Jonveaux P, Roux AF, Claustres M, Fliegel L, Koenig M. Mutation of SLC9A1, encoding the major Na+/H+ exchanger, causes ataxia-deafness Lichtenstein-Knorr syndrome. Hum Mol Genet 2014; 24:463-70. [DOI: 10.1093/hmg/ddu461] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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Meneret A, Ahmar-Beaugendre Y, Rieunier G, Mahlaoui N, Gaymard B, Apartis E, Tranchant C, Rivaud-Pechoux S, Degos B, Benyahia B, Suarez F, Maisonobe T, Koenig M, Durr A, Stern MH, Dubois d'Enghien C, Fischer A, Vidailhet M, Stoppa-Lyonnet D, Grabli D, Anheim M. The pleiotropic movement disorders phenotype of adult ataxia-telangiectasia. Neurology 2014; 83:1087-95. [DOI: 10.1212/wnl.0000000000000794] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Beltran L, Koenig M, Egner W, Howard M, Butt A, Austin MR, Patel D, Sanderson RR, Goubet S, Saleh F, Lavender J, Stainer E, Tarzi MD. High-titre circulating tissue transglutaminase-2 antibodies predict small bowel villous atrophy, but decision cut-off limits must be locally validated. Clin Exp Immunol 2014; 176:190-8. [PMID: 24325651 DOI: 10.1111/cei.12249] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/05/2013] [Indexed: 12/19/2022] Open
Abstract
Numerous studies suggest that high levels of circulating immunoglobulin (Ig)A tissue transglutaminase (TTG2) antibodies predict coeliac disease with high specificity. Accordingly, it has been suggested that duodenal biopsy may not be required routinely for diagnostic confirmation where quantitative serology identifies the presence of high antibody titres. However, defining a cut-off TTG2 threshold is problematic, as the multiple available assay methods are not harmonized and most studies have been focused on the paediatric population. Recent paediatric guidelines proposed a TTG2 antibody diagnostic cut-off at 10 × the upper limit of normal (ULN) for the method; however, concerns remain about errors of generalization, between both methods and laboratories. In this study, we used retrospective laboratory data to investigate the relationship between TTG2 antibody levels and Marsh 3 histology in the seropositive population of adults and children at a single centre. Among 202 seropositive patients with corresponding biopsies, it was possible to define a TTG2 antibody cut-off with 100% specificity for Marsh 3 histology, at just over 10 × ULN for the method. However, UK National External Quality Assurance Scheme returns during the study period showed a wide dispersion of results and poor consensus, both between methods and between laboratories using the same method. Our results support the view that high-titre TTG2 antibody levels have strong predictive value for villous atrophy in adults and children, but suggest that decision cut-offs to guide biopsy requirement will require local validation. TTG2 antibody assay harmonization is a priority, in order to meet the evolving requirements of laboratory users in this field.
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Assoum M, Salih MA, Drouot N, Hnia K, Martelli A, Koenig M. The Salih ataxia mutation impairs Rubicon endosomal localization. THE CEREBELLUM 2014; 12:835-40. [PMID: 23728897 DOI: 10.1007/s12311-013-0489-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
We previously described a new form of recessive ataxia, Salih ataxia, in a large consanguineous Saudi Arabian family with three affected children carrying a new identified mutation in the KIAA0226 gene (c.2624delC; p.Ala875ValfsX146) coding for Rubicon. The pathogenicity of such mutation remains to be identified. Hence, we address the cellular impact of Rubicon p.Ala875ValfsX146 on endosomal/lysosomal machinery on cultured cells. We confirm that Rubicon colocalizes with the late endosome marker Rab7 and demonstrate that it also colocalizes with LampI at lysosomes. The Salih ataxia mutation leads to a diffuse cytosolic distribution and mislocalized protein from the late endosomes, indicating that deletion of the diacylglycerol binding-like motif in the mutant protein interferes with normal Rubicon subcellular localization and confirming the pathogenicity of the mutation.
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Yurchak R, Ravasio A, Pelka A, Pikuz S, Falize E, Vinci T, Koenig M, Loupias B, Benuzzi-Mounaix A, Fatenejad M, Tzeferacos P, Lamb DQ, Blackman EG. Experimental demonstration of an inertial collimation mechanism in nested outflows. PHYSICAL REVIEW LETTERS 2014; 112:155001. [PMID: 24785042 DOI: 10.1103/physrevlett.112.155001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Indexed: 06/03/2023]
Abstract
Interaction between a central outflow and a surrounding wind is common in astrophysical sources powered by accretion. Understanding how the interaction might help to collimate the inner central outflow is of interest for assessing astrophysical jet formation paradigms. In this context, we studied the interaction between two nested supersonic plasma flows generated by focusing a long-pulse high-energy laser beam onto a solid target. A nested geometry was created by shaping the energy distribution at the focal spot with a dedicated phase plate. Optical and x-ray diagnostics were used to study the interacting flows. Experimental results and numerical hydrodynamic simulations indeed show the formation of strongly collimated jets. Our work experimentally confirms the "shock-focused inertial confinement" mechanism proposed in previous theoretical astrophysics investigations.
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Hamza W, Pacha L, Hamadouche T, Tazir M, Koenig M, Benhassine T. Diagnostic de l’ataxie spastique autosomique récessive de Charlevoix-Saguenay (ARSACS) chez des patients algériens. Rev Neurol (Paris) 2014. [DOI: 10.1016/j.neurol.2014.01.393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Marelli C, Salih MM, Nguyen K, Mallaret M, Drouot N, Labauge P, Koenig M. Paraparésie spastique héréditaire à phénotype complexe avec mutation dans le gène FA2H : description de 5 cas. Rev Neurol (Paris) 2014. [DOI: 10.1016/j.neurol.2014.01.405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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