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2. Biallelic variants in HPDL cause pure and complicated hereditary spastic paraplegia.

Author

Wiessner, Manuela, Maroofian, Reza, Ni, Meng-Yuan, Pedroni, Andrea, Müller, Juliane S, Stucka, Rolf, Beetz, Christian, Efthymiou, Stephanie, Santorelli, Filippo M, Alfares, Ahmed A, Zhu, Changlian, Uhrova Meszarosova, Anna, Alehabib, Elham, Bakhtiari, Somayeh, Janecke, Andreas R, Otero, Maria Gabriela, Chen, Jin Yun Helen, Peterson, James T, Strom, Tim M, De Jonghe, Peter, Deconinck, Tine, De Ridder, Willem, De Winter, Jonathan, Pasquariello, Rossella, Ricca, Ivana, Alfadhel, Majid, van de Warrenburg, Bart P, Portier, Ruben, Bergmann, Carsten, Ghasemi Firouzabadi, Saghar, Jin, Sheng Chih, Bilguvar, Kaya, Hamed, Sherifa, Abdelhameed, Mohammed, Haridy, Nourelhoda A, Maqbool, Shazia, Rahman, Fatima, Anwar, Najwa, Carmichael, Jenny, Pagnamenta, Alistair, Wood, Nick W, Tran Mau-Them, Frederic, Haack, Tobias, Di Rocco, Maja, Ceccherini, Isabella, Iacomino, Michele, Zara, Federico, Salpietro, Vincenzo, Scala, Marcello, Rusmini, Marta, Xu, Yiran, Wang, Yinghong, Suzuki, Yasuhiro, Koh, Kishin, Nan, Haitian, Ishiura, Hiroyuki, Tsuji, Shoji, Lambert, Laëtitia, Schmitt, Emmanuelle, Lacaze, Elodie, Küpper, Hanna, Dredge, David, Skraban, Cara, Goldstein, Amy, Willis, Mary JH, Grand, Katheryn, Graham, John M, Lewis, Richard A, Millan, Francisca, Duman, Özgür, Dündar, Nihal, Uyanik, Gökhan, Schöls, Ludger, Nürnberg, Peter, Nürnberg, Gudrun, Catala Bordes, Andrea, Seeman, Pavel, Kuchar, Martin, Darvish, Hossein, Rebelo, Adriana, Bouçanova, Filipa, Medard, Jean-Jacques, Chrast, Roman, Auer-Grumbach, Michaela, Alkuraya, Fowzan S, Shamseldin, Hanan, Al Tala, Saeed, Rezazadeh Varaghchi, Jamileh, Najafi, Maryam, Deschner, Selina, Gläser, Dieter, Hüttel, Wolfgang, Kruer, Michael C, Kamsteeg, Erik-Jan, Takiyama, Yoshihisa, Züchner, Stephan, Baets, Jonathan, Synofzik, Matthis, Schüle, Rebecca, and Horvath, Rita

Subjects
Neurosciences, Neurodegenerative, Genetics, Clinical Research, Aetiology, 2.1 Biological and endogenous factors, Neurological, Animals, Female, Humans, Male, Mice, Mutation, Oxygenases, Pedigree, Rats, Spastic Paraplegia, Hereditary, Zebrafish, hereditary spastic paraplegia, HSP, autosomal recessive, mitochondrial disorder, HPDL, Genomics England Research Consortium, PREPARE network, Medical and Health Sciences, Psychology and Cognitive Sciences, Neurology & Neurosurgery
Abstract

Human 4-hydroxyphenylpyruvate dioxygenase-like (HPDL) is a putative iron-containing non-heme oxygenase of unknown specificity and biological significance. We report 25 families containing 34 individuals with neurological disease associated with biallelic HPDL variants. Phenotypes ranged from juvenile-onset pure hereditary spastic paraplegia to infantile-onset spasticity and global developmental delays, sometimes complicated by episodes of neurological and respiratory decompensation. Variants included bona fide pathogenic truncating changes, although most were missense substitutions. Functionality of variants could not be determined directly as the enzymatic specificity of HPDL is unknown; however, when HPDL missense substitutions were introduced into 4-hydroxyphenylpyruvate dioxygenase (HPPD, an HPDL orthologue), they impaired the ability of HPPD to convert 4-hydroxyphenylpyruvate into homogentisate. Moreover, three additional sets of experiments provided evidence for a role of HPDL in the nervous system and further supported its link to neurological disease: (i) HPDL was expressed in the nervous system and expression increased during neural differentiation; (ii) knockdown of zebrafish hpdl led to abnormal motor behaviour, replicating aspects of the human disease; and (iii) HPDL localized to mitochondria, consistent with mitochondrial disease that is often associated with neurological manifestations. Our findings suggest that biallelic HPDL variants cause a syndrome varying from juvenile-onset pure hereditary spastic paraplegia to infantile-onset spastic tetraplegia associated with global developmental delays.

Published
2021

4. Pathogenic variants in the AFG3L2 proteolytic domain cause SCA28 through haploinsufficiency and proteostatic stress-driven OMA1 activation

Author

Tulli, Susanna, Del Bondio, Andrea, Baderna, Valentina, Mazza, Davide, Codazzi, Franca, Pierson, Tyler Mark, Ambrosi, Alessandro, Nolte, Dagmar, Goizet, Cyril, Toro, Camilo, Baets, Jonathan, Deconinck, Tine, DeJonghe, Peter, Mandich, Paola, Casari, Giorgio, and Maltecca, Francesca

Subjects
Biochemistry and Cell Biology, Biological Sciences, Rare Diseases, Aetiology, 2.1 Biological and endogenous factors, ATP-Dependent Proteases, ATPases Associated with Diverse Cellular Activities, Animals, Calcium, Fibroblasts, Genetic Variation, HEK293 Cells, Haploinsufficiency, Humans, Metalloendopeptidases, Mice, Mice, Knockout, Mitochondria, Models, Biological, Protein Binding, Protein Domains, Protein Multimerization, Proteolysis, Proteostasis, Stress, Physiological, Transcriptional Activation, genetics, molecular genetics, movement disorders, mitochondria, cell biology, Medical and Health Sciences, Genetics & Heredity, Genetics, Clinical sciences
Abstract

BACKGROUND:Spinocerebellar ataxia type 28 (SCA28) is a dominantly inherited neurodegenerative disease caused by pathogenic variants in AFG3L2. The AFG3L2 protein is a subunit of mitochondrial m-AAA complexes involved in protein quality control. Objective of this study was to determine the molecular mechanisms of SCA28, which has eluded characterisation to date. METHODS:We derived SCA28 patient fibroblasts carrying different pathogenic variants in the AFG3L2 proteolytic domain (missense: the newly identified p.F664S and p.M666T, p.G671R, p.Y689H and a truncating frameshift p.L556fs) and analysed multiple aspects of mitochondrial physiology. As reference of residual m-AAA activity, we included SPAX5 patient fibroblasts with homozygous p.Y616C pathogenic variant, AFG3L2+/- HEK293 T cells by CRISPR/Cas9-genome editing and Afg3l2 -/- murine fibroblasts. RESULTS:We found that SCA28 cells carrying missense changes have normal levels of assembled m-AAA complexes, while the cells with a truncating pathogenic variant had only half of this amount. We disclosed inefficient mitochondrial fusion in SCA28 cells caused by increased OPA1 processing operated by hyperactivated OMA1. Notably, we found altered mitochondrial proteostasis to be the trigger of OMA1 activation in SCA28 cells, with pharmacological attenuation of mitochondrial protein synthesis resulting in stabilised levels of OMA1 and OPA1 long forms, which rescued mitochondrial fusion efficiency. Secondary to altered mitochondrial morphology, mitochondrial calcium uptake resulted decreased in SCA28 cells. CONCLUSION:Our data identify the earliest events in SCA28 pathogenesis and open new perspectives for therapy. By identifying similar mitochondrial phenotypes between SCA28 cells and AFG3L2+/- cells, our results support haploinsufficiency as the mechanism for the studied pathogenic variants.

Published
2019

5. Dominant NARS1 mutations causing axonal Charcot–Marie–Tooth disease expand NARS1-associated diseases

Author

Beijer, Danique, primary, Marte, Sheila, additional, Li, Jiaxin C, additional, De Ridder, Willem, additional, Chen, Jessie Z, additional, Tadenev, Abigail L D, additional, Miers, Kathy E, additional, Deconinck, Tine, additional, Macdonell, Richard, additional, Marques, Wilson, additional, De Jonghe, Peter, additional, Pratt, Samia L, additional, Meyer-Schuman, Rebecca, additional, Züchner, Stephan, additional, Antonellis, Anthony, additional, Burgess, Robert W, additional, and Baets, Jonathan, additional

Published
2024
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6. Vitamin D3 deficiency and osteopenia in spastic paraplegia type 5 indicate impaired bone homeostasis.

Author

Ehnert, Sabrina, Hauser, Stefan, Hengel, Holger, Höflinger, Philip, Schüle, Rebecca, Lindig, Tobias, Baets, Jonathan, Deconinck, Tine, de Jonghe, Peter, Histing, Tina, Nüssler, Andreas K., Schöls, Ludger, and Rattay, Tim W.

Subjects
VITAMIN deficiency, BONE densitometry, FAMILIAL spastic paraplegia, HOMEOSTASIS, OSTEOPENIA, HYDROXYCHOLESTEROLS, PARAPLEGIA, COLLAGEN
Abstract

Hereditary spastic paraplegia type 5 (SPG5) is an autosomal recessively inherited movement disorder characterized by progressive spastic gait disturbance and afferent ataxia. SPG5 is caused by bi-allelic loss of function mutations in CYP7B1 resulting in accumulation of the oxysterols 25-hydroxycholesterol and 27-hydroxycholesterol in serum and cerebrospinal fluid of SPG5 patients. An effect of 27- hydroxycholesterol via the estrogen and liver X receptors was previously shown on bone homeostasis. This study analyzed bone homeostasis and osteopenia in 14 SPG5 patients as a non-motor feature leading to a potential increased risk for bone fractures. T-Scores in CT bone density measurements were reduced, indicating osteopenia in SPG5 patients. Further, we analyzed various metabolites of bone homeostasis by ELISA in serum samples of these patients. We identified a lack of vitamin D3 metabolites (Calcidiol and Calcitriol), an increase in Sclerostin as a bone formation/mineralization inhibiting factor, and a decrease in cross-linked N-telopeptide of type I collagen (NTX), a marker indicating reduced bone resorption. As statin treatment has been found to lower oxysterol levels, we evaluated its effect in samples of the STOP-SPG5 trial and found atorvastatin to normalize the increased sclerostin levels. In summary, our study identified osteopenia as a non-motor feature in SPG5 and suggests the need for vitamin D3 substitution in SPG5 patients. Sclerostin may be considered a therapeutic target and biomarker in upcoming therapeutical trials in SPG5. [ABSTRACT FROM AUTHOR]

Published
2024
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7. The genetic landscape of axonal neuropathies in the middle-aged and elderly: Focus on MME

Author

Senderek, Jan, Lassuthova, Petra, Kabzińska, Dagmara, Abreu, Lisa, Baets, Jonathan, Beetz, Christian, Braathen, Geir J., Brenner, David, Dalton, Joline, Dankwa, Lois, Deconinck, Tine, De Jonghe, Peter, Dräger, Bianca, Eggermann, Katja, Ellis, Melina, Fischer, Carina, Stojkovic, Tanya, Herrmann, David N., Horvath, Rita, Høyer, Helle, Iglseder, Stephan, Kennerson, Marina, Kinslechner, Katharina, Kohler, Jennefer N., Kurth, Ingo, Laing, Nigel G., Lamont, Phillipa J., N. Löscher, Wolfgang, Ludolph, Albert, Marques, Wilson, Jr, Nicholson, Garth, Ong, Royston, Petri, Susanne, Ravenscroft, Gianina, Rebelo, Adriana, Ricci, Giulia, Rudnik-Schöneborn, Sabine, Schirmacher, Anja, Schlotter-Weigel, Beate, Schoels, Ludger, Schüle, Rebecca, Synofzik, Matthis, Francou, Bruno, Strom, Tim M., Wagner, Johannes, Walk, David, Wanschitz, Julia, Weinmann, Daniela, Weishaupt, Jochen, Wiessner, Manuela, Windhager, Reinhard, Young, Peter, Züchner, Stephan, Toegel, Stefan, Seeman, Pavel, Kochański, Andrzej, and Auer-Grumbach, Michaela

Published
2020
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8. De novo ITPR1 variants are a recurrent cause of early-onset ataxia, acting via loss of channel function

Author

Synofzik, Matthis, Helbig, Katherine L., Harmuth, Florian, Deconinck, Tine, Tanpaiboon, Pranoot, Sun, Bo, Guo, Wenting, Wang, Ruiwu, Palmaer, Erika, Tang, Sha, Schaefer, G. Bradley, Gburek-Augustat, Janina, Züchner, Stephan, Krägeloh-Mann, Ingeborg, Baets, Jonathan, de Jonghe, Peter, Bauer, Peter, Chen, S. R. Wayne, Schöls, Ludger, and Schüle, Rebecca

Published
2018
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9. Loss of paraplegin drives spasticity rather than ataxia in a cohort of 241 patients with SPG7

Author

Coarelli, Giulia, Schule, Rebecca, van de Warrenburg, Bart P.C., De Jonghe, Peter, Ewenczyk, Claire, Martinuzzi, Andrea, Synofzik, Matthis, Hamer, Elisa G., Baets, Jonathan, Anheim, Mathieu, Schöls, Ludger, Deconinck, Tine, Masrori, Pegah, Fontaine, Bertrand, Klockgether, Thomas, DʼAngelo, Maria Grazia, Monin, Marie-Lorraine, De Bleecker, Jan, Migeotte, Isabelle, Charles, Perrine, Bassi, Maria Teresa, Klopstock, Thomas, Mochel, Fanny, Ollagnon-Roman, Elisabeth, DʼHooghe, Marc, Kamm, Christoph, Kurzwelly, Delia, Papin, Melanie, Davoine, Claire-Sophie, Banneau, Guillaume, Tezenas du Montcel, Sophie, Seilhean, Danielle, Brice, Alexis, Duyckaerts, Charles, Stevanin, Giovanni, and Durr, Alexandra

Published
2019
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10. Biallelic VARS variants cause developmental encephalopathy with microcephaly that is recapitulated in vars knockout zebrafish

Author

Siekierska, Aleksandra, Stamberger, Hannah, Deconinck, Tine, Oprescu, Stephanie N., Partoens, Michèle, Zhang, Yifan, Sourbron, Jo, Adriaenssens, Elias, Mullen, Patrick, Wiencek, Patrick, Hardies, Katia, Lee, Jeong-Soo, Giong, Hoi-Khoanh, Distelmaier, Felix, Elpeleg, Orly, Helbig, Katherine L., Hersh, Joseph, Isikay, Sedat, Jordan, Elizabeth, Karaca, Ender, Kecskes, Angela, Lupski, James R., Kovacs-Nagy, Reka, May, Patrick, Narayanan, Vinodh, Pendziwiat, Manuela, Ramsey, Keri, Rangasamy, Sampathkumar, Shinde, Deepali N., Spiegel, Ronen, Timmerman, Vincent, von Spiczak, Sarah, Helbig, Ingo, C4RCD Research Group, AR working group of the EuroEPINOMICS RES Consortium, Weckhuysen, Sarah, Francklyn, Christopher, Antonellis, Anthony, de Witte, Peter, and De Jonghe, Peter

Published
2019
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12. De Novo and Dominantly Inherited <scp> SPTAN1 </scp> Mutations Cause Spastic Paraplegia and Cerebellar Ataxia

Author

Van de Vondel, Liedewei, De Winter, Jonathan, Deconinck, Tine, Vural, Atay, Ertan, Sibel, Dogu, Okan, Uysal, Hilmi, Brankovic, Vesna, Herzog, Rebecca, Brice, Alexis, Dürr, Alexandra, Klebe, Stephan, Beijer, Danique, Stock, Friedrich, Bischoff, Almut Turid, Rattay, Tim W, Sobrido, María-Jesús, De Michele, Giovanna, De Jonghe, Peter, Klopstock, Thomas, Lohmann, Katja, Zanni, Ginevra, Santorelli, Filippo M, Coarelli, Giulia, Timmerman, Vincent, Haack, Tobias B, Züchner, Stephan, Consortium, PREPARE, Schüle, Rebecca, Stevanin, Giovanni, Synofzik, Matthis, Basak, A Nazli, Baets, Jonathan, Wayand, Melanie, Palvadeau, Robin, Pauly, Martje G, Klein, Katrin, Rautenberg, Maren, Guillot-Noël, Léna, and PREPARE Consortium

Subjects
spastic paraplegia, Cerebellar Ataxia, genetics [Spectrin], Medizin, genetics [Mutation], genetics [Carrier Proteins], Article, genetics [Paraplegia], genetics [Spastic Paraplegia, Hereditary], Intellectual Disability, Humans, ddc:610, Paraplegia, genetics [Cerebellar Ataxia], Spastic Paraplegia, Hereditary, ataxia, Microfilament Proteins, rare diseases, Spectrin, Pedigree, spectrin, Phenotype, Neurology, Mutation, next-generation sequencing, Human medicine, Neurology (clinical), genetics [Intellectual Disability], genetics [Microfilament Proteins], Carrier Proteins
Abstract

Background Pathogenic variants in SPTAN1 have been linked to a remarkably broad phenotypical spectrum. Clinical presentations include epileptic syndromes, intellectual disability, and hereditary motor neuropathy. Objectives We investigated the role of SPTAN1 variants in rare neurological disorders such as ataxia and spastic paraplegia. Methods We screened 10,000 NGS datasets across two international consortia and one local database, indicative of the level of international collaboration currently required to identify genes causative for rare disease. We performed in silico modeling of the identified SPTAN1 variants. Results We describe 22 patients from 14 families with five novel SPTAN1 variants. Of six patients with cerebellar ataxia, four carry a de novo SPTAN1 variant and two show a sporadic inheritance. In this group, one variant (p.Lys2083del) is recurrent in four patients. Two patients have novel de novo missense mutations (p.Arg1098Cys, p.Arg1624Cys) associated with cerebellar ataxia, in one patient accompanied by intellectual disability and epilepsy. We furthermore report a recurrent missense mutation (p.Arg19Trp) in 15 patients with spastic paraplegia from seven families with a dominant inheritance pattern in four and a de novo origin in one case. One further patient carrying a de novo missense mutation (p.Gln2205Pro) has a complex spastic ataxic phenotype. Through protein modeling we show that mutated amino acids are located at crucial interlinking positions, interconnecting the three-helix bundle of a spectrin repeat. Conclusions We show that SPTAN1 is a relevant candidate gene for ataxia and spastic paraplegia. We suggest that for the mutations identified in this study, disruption of the interlinking of spectrin helices could be a key feature of the pathomechanism. © 2022 International Parkinson and Movement Disorder Society

Published
2022

13. Hereditary spastic paraplegia type 5: natural history, biomarkers and a randomized controlled trial

Author

Schöls, Ludger, Rattay, Tim W, Martus, Peter, Meisner, Christoph, Baets, Jonathan, Fischer, Imma, Jägle, Christine, Fraidakis, Matthew J, Martinuzzi, Andrea, Saute, Jonas Alex, Scarlato, Marina, Antenora, Antonella, Stendel, Claudia, Höflinger, Philip, Lourenco, Charles Marques, Abreu, Lisa, Smets, Katrien, Paucar, Martin, Deconinck, Tine, Bis, Dana M, Wiethoff, Sarah, Bauer, Peter, Arnoldi, Alessia, Marques, Wilson, Jardim, Laura Bannach, Hauser, Stefan, Criscuolo, Chiara, Filla, Alessandro, Züchner, Stephan, Bassi, Maria Teresa, Klopstock, Thomas, De Jonghe, Peter, Björkhem, Ingemar, and Schüle, Rebecca

Published
2017
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14. Relative Contribution of Mutations in Genes for Autosomal Dominant Distal Hereditary Motor Neuropathies: A Genotype-Phenotype Correlation Study

Author

Dierick, Ines, Baets, Jonathan, Irobi, Joy, Jacobs, An, De Vriendt, Els, Deconinck, Tine, Merlini, Luciano, Van den Bergh, Peter, Rasic, Vedrana Milic, Robberecht, Wim, Fischer, Dirk, Morales, Raul Juntas, Mitrovic, Zoran, Seeman, Pavel, Mazanec, Radim, Kochanski, Andrzej, Jordanova, Albena, Auer-Grumbach, Michaela, Helderman-van den Enden, A. T. J. M., Wokke, John H. J., Nelis, Eva, De Jonghe, Peter, and Timmerman, Vincent

Abstract

Distal hereditary motor neuropathy (HMN) is a clinically and genetically heterogeneous group of disorders affecting spinal alpha-motor neurons. Since 2001, mutations in six different genes have been identified for autosomal dominant distal HMN; "glycyl-tRNA synthetase (GARS)," "dynactin 1 (DCTN1)," "small heat shock 27 kDa protein 1 (HSPB1)," "small heat shock 22 kDa protein 8 (HSPB8)," "Berardinelli-Seip congenital lipodystrophy (BSCL2)" and "senataxin (SETX)." In addition a mutation in the "(VAMP)-associated protein B and C (VAPB)" was found in several Brazilian families with complex and atypical forms of autosomal dominantly inherited motor neuron disease. We have investigated the distribution of mutations in these seven genes in a cohort of 112 familial and isolated patients with a diagnosis of distal motor neuropathy and found nine different disease-causing mutations in "HSPB8," "HSPB1," "BSCL2" and "SETX" in 17 patients of whom 10 have been previously reported. No mutations were found in "GARS," "DCTN1" and "VAPB". The phenotypic features of patients with mutations in "HSPB8," "HSPB1," "BSCL2" and "SETX" fit within the distal HMN classification, with only one exception; a C-terminal "HSPB1"-mutation was associated with upper motor neuron signs. Furthermore, we provide evidence for a genetic mosaicism in transmitting an "HSPB1" mutation. This study, performed in a large cohort of familial and isolated distal HMN patients, clearly confirms the genetic and phenotypic heterogeneity of distal HMN and provides a basis for the development of algorithms for diagnostic mutation screening in this group of disorders.

Published
2008
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15. REEP1 Mutation Spectrum and Genotype/Phenotype Correlation in Hereditary Spastic Paraplegia Type 31

Author

Beetz, Christian, Schule, Rebecca, and Deconinck, Tine

Abstract

Mutations in the receptor expression enhancing protein 1 (REEP1) have recently been reported to cause autosomal dominant hereditary spastic paraplegia (HSP) type SPG31. In a large collaborative effort, we screened a sample of 535 unrelated HSP patients for "REEP1" mutations and copy number variations. We identified 13 novel and 2 known "REEP1" mutations in 16 familial and sporadic patients by direct sequencing analysis. Twelve out of 16 mutations were small insertions, deletions or splice site mutations. These changes would result in shifts of the open-reading-frame followed by premature termination of translation and haploinsufficiency. Interestingly, we identified two disease associated variations in the 3'-UTR of "REEP1" that fell into highly conserved micro RNA binding sites. Copy number variation analysis in a subset of 133 HSP index patients revealed a large duplication of "REEP1" that involved exons 2-7 in an Irish family. Clinically most SPG31 patients present with a pure spastic paraplegia; rare complicating features were restricted to symptoms or signs of peripheral nerve involvement. Interestingly, the distribution of age at onset suggested a bimodal pattern with the appearance of initial symptoms of disease either before the age of 20 years or after the age of 30 years. The overall mutation rate in our clinically heterogeneous sample was 3.0%; however, in the sub-sample of pure HSP "REEP1" mutations accounted for 8.2% of all patients. These results firmly establish "REEP1" as a relatively frequent autosomal dominant HSP gene for which genetic testing is warranted. We also establish haploinsufficiency as the main molecular genetic mechanism in SPG31, which should initiate and guide functional studies on "REEP1" with a focus on loss-of-function mechanisms. Our results should be valid as a reference for mutation frequency, spectrum of "REEP1" mutations, and clinical phenotypes associated with SPG31.

Published
2008
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16. Unraveling the genetic landscape of autosomal recessive Charcot-Marie-Tooth neuropathies using a homozygosity mapping approach

Author

Zimoń, Magdalena, Battaloğlu, Esra, Parman, Yesim, Erdem, Sevim, Baets, Jonathan, De Vriendt, Els, Atkinson, Derek, Almeida-Souza, Leonardo, Deconinck, Tine, Ozes, Burcak, Goossens, Dirk, Cirak, Sebahattin, Van Damme, Philip, Shboul, Mohammad, Voit, Thomas, Van Maldergem, Lionel, Dan, Bernard, El-Khateeb, Mohammed S., Guergueltcheva, Velina, Lopez-Laso, Eduardo, Goemans, Nathalie, Masri, Amira, Züchner, Stephan, Timmerman, Vincent, Topaloğlu, Haluk, De Jonghe, Peter, and Jordanova, Albena

Published
2015
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17. Motor neuron degeneration in spastic paraplegia 11 mimics amyotrophic lateral sclerosis lesions

Author

Denora, Paola S., Smets, Katrien, Zolfanelli, Federica, Ceuterick-de Groote, Chantal, Casali, Carlo, Deconinck, Tine, Sieben, Anne, Gonzales, Michael, Zuchner, Stephan, Darios, Frédéric, Peeters, Dirk, Brice, Alexis, Malandrini, Alessandro, De Jonghe, Peter, Santorelli, Filippo M., Stevanin, Giovanni, Martin, Jean-Jacques, and El Hachimi, Khalid H.

Published
2016
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18. SYNE1 ataxia is a common recessive ataxia with major non-cerebellar features: a large multi-centre study

Author

Synofzik, Matthis, Smets, Katrien, Mallaret, Martial, Di Bella, Daniela, Gallenmüller, Constanze, Baets, Jonathan, Schulze, Martin, Magri, Stefania, Sarto, Elisa, Mustafa, Mona, Deconinck, Tine, Haack, Tobias, Züchner, Stephan, Gonzalez, Michael, Timmann, Dagmar, Stendel, Claudia, Klopstock, Thomas, Durr, Alexandra, Tranchant, Christine, Sturm, Marc, Hamza, Wahiba, Nanetti, Lorenzo, Mariotti, Caterina, Koenig, Michel, Schöls, Ludger, Schüle, Rebecca, de Jonghe, Peter, Anheim, Mathieu, Taroni, Franco, and Bauer, Peter

Published
2016
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20. Recessive mutations in SLC13A5 result in a loss of citrate transport and cause neonatal epilepsy, developmental delay and teeth hypoplasia

Author

Hardies, Katia, de Kovel, Carolien G. F., Weckhuysen, Sarah, Asselbergh, Bob, Geuens, Thomas, Deconinck, Tine, Azmi, Abdelkrim, May, Patrick, Brilstra, Eva, Becker, Felicitas, Barisic, Nina, Craiu, Dana, Braun, Kees P.J., Lal, Dennis, Thiele, Holger, Schubert, Julian, Weber, Yvonne, van ‘t Slot, Ruben, Nürnberg, Peter, Balling, Rudi, Timmerman, Vincent, Lerche, Holger, Maudsley, Stuart, Helbig, Ingo, Suls, Arvid, Koeleman, Bobby P.C., De Jonghe, Peter, Afawi, Zaid, Baulac, Stéphanie, Caglayan, Hande, Lopez, Rosa Guerrero, Guerrini, Renzo, Hjalgrim, Helle, Jähn, Johanna, Klein, Karl Martin, Leguern, Eric, Lemke, Johannes, Marini, Carla, Muhle, Hiltrud, Rosenow, Felix, Serratosa, Jose, Štěrbová, Katalin, Moller, Rikke S., Striano, Pasquale, and Zara, Federico

Published
2015
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21. Loss of function mutations in HARS cause a spectrum of inherited peripheral neuropathies

Author

Safka Brozkova, Dana, Deconinck, Tine, Beth Griffin, Laurie, Ferbert, Andreas, Haberlova, Jana, Mazanec, Radim, Lassuthova, Petra, Roth, Christian, Pilunthanakul, Thanita, Rautenstrauss, Bernd, Janecke, Andreas R., Zavadakova, Petra, Chrast, Roman, Rivolta, Carlo, Zuchner, Stephan, Antonellis, Anthony, Beg, Asim A., De Jonghe, Peter, Senderek, Jan, Seeman, Pavel, and Baets, Jonathan

Published
2015
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22. Recessive loss-of-function mutations in AP4S1 cause mild fever-sensitive seizures, developmental delay and spastic paraplegia through loss of AP-4 complex assembly

Author

Hardies, Katia, May, Patrick, Djémié, Tania, Tarta-Arsene, Oana, Deconinck, Tine, Craiu, Dana, Helbig, Ingo, Suls, Arvid, Balling, Rudy, Weckhuysen, Sarah, De Jonghe, Peter, Hirst, Jennifer, Afawi, Zaid, Barisic, Nina, Baulac, Stéphanie, Caglayan, Hande, Depienne, Christel, De Kovel, Carolien G.F., Dimova, Petia, Guerrero-López, Rosa, Guerrini, Renzo, Hjalgrim, Helle, Hoffman-Zacharska, Dorota, Jahn, Johanna, Klein, Karl Martin, Koeleman, Bobby P.C., Leguern, Eric, Lehesjoki, Anna-Elina, Lemke, Johannes, Lerche, Holger, Marini, Carla, Muhle, Hiltrud, Rosenow, Felix, Serratosa, Jose M., Møller, Rikke S., Stephani, Ulrich, Striano, Pasquale, Talvik, Tiina, Von Spiczak, Sarah, Weber, Yvonne, and Zara, Federico

Published
2015
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23. Characterization of HNRNPA1 mutations defines diversity in pathogenic mechanisms and clinical presentation

Author

Beijer, Danique, primary, Kim, Hong Joo, additional, Guo, Lin, additional, O’Donovan, Kevin, additional, Mademan, Inès, additional, Deconinck, Tine, additional, Van Schil, Kristof, additional, Fare, Charlotte M., additional, Drake, Lauren E., additional, Ford, Alice F., additional, Kochański, Andrzej, additional, Kabzińska, Dagmara, additional, Dubuisson, Nicolas, additional, Van den Bergh, Peter, additional, Voermans, Nicol C., additional, Lemmers, Richard J.L.F., additional, van der Maarel, Silvère M., additional, Bonner, Devon, additional, Sampson, Jacinda B., additional, Wheeler, Matthew T., additional, Mehrabyan, Anahit, additional, Palmer, Steven, additional, De Jonghe, Peter, additional, Shorter, James, additional, Taylor, J. Paul, additional, and Baets, Jonathan, additional

Published
2021
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25. Characterization of HNRNPA1 mutations defines diversity in pathogenic mechanisms and clinical presentation.

Author

UCL - (SLuc) Service de neurologie, UCL - SSS/IREC/EDIN - Pôle d'endocrinologie, diabète et nutrition, UCL - (SLuc) Centre de référence neuromusculaire, Beijer, Danique, Kim, Hong Joo, Guo, Lin, O'Donovan, Kevin, Mademan, Inès, Deconinck, Tine, Van Schil, Kristof, Fare, Charlotte M, Drake, Lauren E, Ford, Alice F, Kochański, Andrzej, Kabzińska, Dagmara, Dubuisson, Nicolas, Van den Bergh, Peter, Voermans, Nicol C, Lemmers, Richard Jlf, van der Maarel, Silvère M, Bonner, Devon, Sampson, Jacinda B, Wheeler, Matthew T, Mehrabyan, Anahit, Palmer, Steven, De Jonghe, Peter, Shorter, James, Taylor, J Paul, Baets, Jonathan, UCL - (SLuc) Service de neurologie, UCL - SSS/IREC/EDIN - Pôle d'endocrinologie, diabète et nutrition, UCL - (SLuc) Centre de référence neuromusculaire, Beijer, Danique, Kim, Hong Joo, Guo, Lin, O'Donovan, Kevin, Mademan, Inès, Deconinck, Tine, Van Schil, Kristof, Fare, Charlotte M, Drake, Lauren E, Ford, Alice F, Kochański, Andrzej, Kabzińska, Dagmara, Dubuisson, Nicolas, Van den Bergh, Peter, Voermans, Nicol C, Lemmers, Richard Jlf, van der Maarel, Silvère M, Bonner, Devon, Sampson, Jacinda B, Wheeler, Matthew T, Mehrabyan, Anahit, Palmer, Steven, De Jonghe, Peter, Shorter, James, Taylor, J Paul, and Baets, Jonathan

Abstract

Mutations in HNRNPA1 encoding heterogeneous nuclear ribonucleoprotein (hnRNP) A1 are a rare cause of amyotrophic lateral sclerosis (ALS) and multisystem proteinopathy (MSP). hnRNPA1 is part of the group of RNA-binding proteins (RBPs) that assemble with RNA to form RNPs. hnRNPs are concentrated in the nucleus and function in pre-mRNA splicing, mRNA stability, and the regulation of transcription and translation. During stress, hnRNPs, mRNA, and other RBPs condense in the cytoplasm to form stress granules (SGs). SGs are implicated in the pathogenesis of (neuro-)degenerative diseases, including ALS and inclusion body myopathy (IBM). Mutations in RBPs that affect SG biology, including FUS, TDP-43, hnRNPA1, hnRNPA2B1, and TIA1, underlie ALS, IBM, and other neurodegenerative diseases. Here, we characterize 4 potentially novel HNRNPA1 mutations (yielding 3 protein variants: *321Eext*6, *321Qext*6, and G304Nfs*3) and 2 known HNRNPA1 mutations (P288A and D262V), previously connected to ALS and MSP, in a broad spectrum of patients with hereditary motor neuropathy, ALS, and myopathy. We establish that the mutations can have different effects on hnRNPA1 fibrillization, liquid-liquid phase separation, and SG dynamics. P288A accelerated fibrillization and decelerated SG disassembly, whereas *321Eext*6 had no effect on fibrillization but decelerated SG disassembly. By contrast, G304Nfs*3 decelerated fibrillization and impaired liquid phase separation. Our findings suggest different underlying pathomechanisms for HNRNPA1 mutations with a possible link to clinical phenotypes.

Published
2021

26. Mutations in the ER-shaping protein reticulon 2 cause the axon-degenerative disorder hereditary spastic paraplegia type 12

Author

Montenegro, Gladys, Rebelo, Adriana P., Connell, James, Allison, Rachel, Babalini, Carla, D'Aloia, Michela, Montieri, Pasqua, Schule, Rebecca, Ishiura, Hiroyuki, Price, Justin, Strickland, Alleene, Gonzalez, Michael A., Baumbach-Reardon, Lisa, Deconinck, Tine, Huang, Jia, Bernardi, Giorgio, Vance, Jeffery M., Rogers, Mark T., Tsuji, Shoji, Jonghe, Peter De, Pericak-Vance, Margaret A., Schols, Ludger, Orlacchio, Antonio, Reid, Evan, and Zuchner, Stephan

Subjects
Gene mutations -- Health aspects, Heat shock proteins -- Physiological aspects -- Genetic aspects -- Research, Paralysis, Spastic -- Genetic aspects -- Risk factors -- Research, Health care industry
Abstract

Hereditary spastic paraplegias (HSPs) are a group of genetically heterogeneous neurodegenerative conditions. They are characterized by progressive spastic paralysis of the legs as a result of selective, length-dependent degeneration of the axons of the corticospinal tract. Mutations in 3 genes encoding proteins that work together to shape the ER into sheets and tubules--receptor accessory protein 1 (REEP1), atlastin-1 (ATL1), and spastin (SPAST)--have been found to underlie many cases of HSP in Northern Europe and North America. Applying Sanger and exome sequencing, we have now identified 3 mutations in reticulon 2 (RTN2), which encodes a member of the reticulon family of prototypic ER-shaping proteins, in families with spastic paraplegia 12 (SPG12). These autosomal dominant mutations included a complete deletion of RTN2 and a frameshift mutation predicted to produce a highly truncated protein. Wild-type reticulon 2, but not the truncated protein potentially encoded by the frameshift allele, localized to the ER. RTN2 interacted with spastin, and this interaction required a hydrophobic region in spastin that is involved in ER localization and that is predicted to form a curvature-inducing/sensing hairpin loop domain. Our results directly implicate a reticulon protein in axonopathy, show that this protein participates in a network of interactions among HSP proteins involved in ER shaping, and further support the hypothesis that abnormal ER morphogenesis is a pathogenic mechanism in HSP., Introduction The ER is a continuous membrane system comprising the nuclear envelope and a dynamic network of proximal sheets and peripheral tubules. Proteins of 2 classes--the reticulons and the REEP/DP1/yop1p [...]

Published
2012
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27. 16p11.2 600 kb Duplications confer risk for typical and atypical Rolandic epilepsy

Author

Reinthaler, Eva M., Lal, Dennis, Lebon, Sebastien, Hildebrand, Michael S., Dahl, Hans-Henrik M., Regan, Brigid M., Feucht, Martha, Steinböck, Hannelore, Neophytou, Birgit, Ronen, Gabriel M., Roche, Laurian, Gruber-Sedlmayr, Ursula, Geldner, Julia, Haberlandt, Edda, Hoffmann, Per, Herms, Stefan, Gieger, Christian, Waldenberger, Melanie, Franke, Andre, Wittig, Michael, Schoch, Susanne, Becker, Albert J., Hahn, Andreas, Männik, Katrin, Toliat, Mohammad R., Winterer, Georg, Lerche, Holger, Nürnberg, Peter, Mefford, Heather, Scheffer, Ingrid E., Berkovic, Samuel F., Beckmann, Jacques S., Sander, Thomas, Jacquemont, Sebastien, Reymond, Alexandre, Zimprich, Fritz, Neubauer, Bernd A., Reinthaler, Eva M., Zimprich, Fritz, Feucht, Martha, Steinböck, Hannelore, Neophytou, Birgit, Geldner, Julia, Gruber-Sedlmayr, Ursula, Haberlandt, Edda, Ronen, Gabriel M., Roche, Laurian, Lal, Dennis, Nürnberg, Peter, Sander, Thomas, Lerche, Holger, Neubauer, Bernd, Zimprich, Fritz, Mörzinger, Martina, Feucht, Martha, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S, Klitten, Laura L., Hjalgrim, Helle, Møller, Rikke S, Campus, Kiel, Helbig, Ingo, Muhle, Hiltrud, Ostertag, Philipp, von Spiczak, Sarah, Stephani, Ulrich, Nürnberg, Peter, Sander, Thomas, Trucks, Holger, Elger, Christian E., Kleefu-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Sander, Thomas, Schmitz, Bettina, Rosenow, Felix, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Becker, Felicitas, Weber, Yvonne, Lerche, Holger, Koeleman, Bobby P.C., de Kovel, Carolien, Lindhout, Dick, Lindhout, Dick, Ameil, Agnès, Andrieux, Joris, Bouquillon, Sonia, Boute, Odile, de Flandre, Jeanne, Cuisset, Jean Marie, Cuvellier, Jean-Christophe, Salengro, Roger, David, Albert, de Vries, Bert, Delrue, Marie-Ange, Doco-Fenzy, Martine, Fernandez, Bridget A., Heron, Delphine, Keren, Boris, Lebel, Robert, Leheup, Bruno, Lewis, Suzanne, Mencarelli, Maria Antonietta, Mignot, Cyril, Minet, Jean-Claude, Moerman, Alexandre, Morice-Picard, Fanny, Mucciolo, Mafalda, Ounap, Katrin, Pasquier, Laurent, Petit, Florence, Ragona, Francesca, Rajcan-Separovic, Evica, Renieri, Alessandra, Rieubland, Claudine, Sanlaville, Damien, Sarrazin, Elisabeth, Shen, Yiping, van Haelst, Mieke, and Silfhout, Anneke Vulto-van

Published
2014
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28. Sensory neuropathy with bone destruction due to a mutation in the membrane-shaping atlastin GTPase 3

Author

Kornak, Uwe, Mademan, Inès, Schinke, Marte, Voigt, Martin, Krawitz, Peter, Hecht, Jochen, Barvencik, Florian, Schinke, Thorsten, Gieelmann, Sebastian, Beil, F. Timo, Pou-Serradell, Adolf, Vílchez, Juan J., Beetz, Christian, Deconinck, Tine, Timmerman, Vincent, Kaether, Christoph, De Jonghe, Peter, Hübner, Christian A., Gal, Andreas, Amling, Michael, Mundlos, Stefan, Baets, Jonathan, and Kurth, Ingo

Published
2014
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29. De Novo and Dominantly Inherited SPTAN1 Mutations Cause Spastic Paraplegia and Cerebellar Ataxia.

Author

Van de Vondel, Liedewei, De Winter, Jonathan, Beijer, Danique, Coarelli, Giulia, Wayand, Melanie, Palvadeau, Robin, Pauly, Martje G., Klein, Katrin, Rautenberg, Maren, Guillot‐Noël, Léna, Deconinck, Tine, Vural, Atay, Ertan, Sibel, Dogu, Okan, Uysal, Hilmi, Brankovic, Vesna, Herzog, Rebecca, Brice, Alexis, Durr, Alexandra, and Klebe, Stephan

Abstract

Background: Pathogenic variants in SPTAN1 have been linked to a remarkably broad phenotypical spectrum. Clinical presentations include epileptic syndromes, intellectual disability, and hereditary motor neuropathy. Objectives: We investigated the role of SPTAN1 variants in rare neurological disorders such as ataxia and spastic paraplegia. Methods: We screened 10,000 NGS datasets across two international consortia and one local database, indicative of the level of international collaboration currently required to identify genes causative for rare disease. We performed in silico modeling of the identified SPTAN1 variants. Results: We describe 22 patients from 14 families with five novel SPTAN1 variants. Of six patients with cerebellar ataxia, four carry a de novo SPTAN1 variant and two show a sporadic inheritance. In this group, one variant (p.Lys2083del) is recurrent in four patients. Two patients have novel de novo missense mutations (p.Arg1098Cys, p.Arg1624Cys) associated with cerebellar ataxia, in one patient accompanied by intellectual disability and epilepsy. We furthermore report a recurrent missense mutation (p.Arg19Trp) in 15 patients with spastic paraplegia from seven families with a dominant inheritance pattern in four and a de novo origin in one case. One further patient carrying a de novo missense mutation (p.Gln2205Pro) has a complex spastic ataxic phenotype. Through protein modeling we show that mutated amino acids are located at crucial interlinking positions, interconnecting the three‐helix bundle of a spectrin repeat. Conclusions: We show that SPTAN1 is a relevant candidate gene for ataxia and spastic paraplegia. We suggest that for the mutations identified in this study, disruption of the interlinking of spectrin helices could be a key feature of the pathomechanism. © 2022 International Parkinson and Movement Disorder Society [ABSTRACT FROM AUTHOR]

Published
2022
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30. Peripheral nerve demyelination caused by a mutant Rho GTPase guanine nucleotide exchange factor, frabin/FGD4

Author

Stendel, Claudia, Roos, Andreas, Deconinck, Tine, Pereira, Jorge, Castagner, Francois, Niemann, Axel, Kirschner, Jandernd, Korinthenberg, Rudolf, Ketelsen, Uwe-Peter, Battaloglu, Esra, Parman, Yesim, Nicholson, Garth, Ouvrier, Robert, Seeger, Jurgen, De Jonghe, Peter, Weis, Joachim, Kruttgen, Alexander, Rudnik-Schoneborn, Sabine, Bergmann, Carsten, Suter, Ueli, Zerres, Klaus, Timmerman, Vincent, Relvas, Joao B., and Senderek, Jan

Subjects
Cell division -- Research, Gene mutations -- Research, Peripheral nerve diseases -- Research, Biological sciences
Abstract

The disruption of frabin/FGD4, a guanine nucleotide exchange factor (GEF) for the Rho GTPase cell-division cycle 42 (Cdc42), has caused peripheral nerve demyelination in patients with autosomal recessive Charcot-Marie-Tooth (CMT) neuropathy. Fabrin's ability to induce Cdc42-mediated cell-shape changes in transfected Schwann cells has indicated that Rho GTPase signaling is necessary for proper myelination of the peripheral nervous system.

Published
2007

31. De Novo and Inherited Variants in GBF1 are Associated with Axonal Neuropathy Caused by Golgi Fragmentation

Author

Mendoza-Ferreira, Natalia, Karakaya, Mert, Cengiz, Nur, Beijer, Danique, Brigatti, Karlla W., Gonzaga-Jauregui, Claudia, Fuhrmann, Nico, Hoelker, Irmgard, Thelen, Maximilian P., Zetzsche, Sebastian, Rombo, Roman, Puffenberger, Erik G., De Jonghe, Peter, Deconinck, Tine, Zuchner, Stephan, Strauss, Kevin A., Carson, Vincent, Schrank, Bertold, Wunderlich, Gilbert, Baets, Jonathan, Wirth, Brunhilde, Mendoza-Ferreira, Natalia, Karakaya, Mert, Cengiz, Nur, Beijer, Danique, Brigatti, Karlla W., Gonzaga-Jauregui, Claudia, Fuhrmann, Nico, Hoelker, Irmgard, Thelen, Maximilian P., Zetzsche, Sebastian, Rombo, Roman, Puffenberger, Erik G., De Jonghe, Peter, Deconinck, Tine, Zuchner, Stephan, Strauss, Kevin A., Carson, Vincent, Schrank, Bertold, Wunderlich, Gilbert, Baets, Jonathan, and Wirth, Brunhilde

Abstract

Distal hereditary motor neuropathies (HMNs) and axonal Charcot-Marie-Tooth neuropathy (CMT2) are clinically and genetically heterogeneous diseases characterized primarily by motor neuron degeneration and distal weakness. The genetic cause for about half of the individuals affected by HMN/CMT2 remains unknown. Here, we report the identification of pathogenic variants in GBF1 (Golgi brefeldin A-resistant guanine nucleotide exchange factor 1) in four unrelated families with individuals affected by sporadic or dominant HMN/CMT2. Genomic sequencing analyses in seven affected individuals uncovered four distinct heterozygous GBF1 variants, two of which occurred de novo. Other known HMN/CMT2-implicated genes were excluded. Affected individuals show HMN/CMT2 with slowly progressive distal muscle weakness and musculoskeletal deformities. Electrophysiological studies confirmed axonal damage with chronic neurogenic changes. Three individuals had additional distal sensory loss. GBF1 encodes a guanine-nucleotide exchange factor that facilitates the activation of members of the ARF (ADP-ribosylation factor) family of small GTPases. GBF1 is mainly involved in the formation of coatomer protein complex (COPI) vesicles, maintenance and function of the Golgi apparatus, and mitochondria migration and positioning. We demonstrate that GBF1 is present in mouse spinal cord and muscle tissues and is particularly abundant in neuropathologically relevant sites, such as the motor neuron and the growth cone. Consistent with the described role of GBF1 in Golgi function and maintenance, we observed marked increase in Golgi fragmentation in primary fibroblasts derived from all affected individuals in this study. Our results not only reinforce the existing link between Golgi fragmentation and neurodegeneration but also demonstrate that pathogenic variants in GBF1 are associated with HMN/CMT2.

Published
2020

33. KCNQ2 encephalopathy: Emerging phenotype of a neonatal epileptic encephalopathy

Author

Weckhuysen, Sarah, Mandelstam, Simone, Suls, Arvid, Audenaert, Dominique, Deconinck, Tine, Claes, Lieve R.F., Deprez, Liesbet, Smets, Katrien, Hristova, Dimitrina, Yordanova, Iglika, Jordanova, Albena, Ceulemans, Berten, Jansen, An, Hasaerts, Danièle, Roelens, Filip, Lagae, Lieven, Yendle, Simone, Stanley, Thorsten, Heron, Sarah E., Mulley, John C., Berkovic, Samuel F., Scheffer, Ingrid E., and Peter de Jonghe

Published
2012
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34. Genetic spectrum of hereditary neuropathies with onset in the first year of life

Author

Baets, Jonathan, Deconinck, Tine, De Vriendt, Els, Zimoń, Magdalena, Yperzeele, Laetitia, Van Hoorenbeeck, Kim, Peeters, Kristien, Spiegel, Ronen, Parman, Yesim, Ceulemans, Berten, Van Bogaert, Patrick, Pou-Serradell, Adolf, Bernert, Günther, Dinopoulos, Argirios, Auer-Grumbach, Michaela, Sallinen, Satu-Leena, Fabrizi, Gian Maria, Pauly, Fernand, Van den Bergh, Peter, Bilir, Birdal, Battaloglu, Esra, Madrid, Ricardo E., Kabzińska, Dagmara, Kochanski, Andrzej, Topaloglu, Haluk, Miller, Geoffrey, Jordanova, Albena, Timmerman, Vincent, and De Jonghe, Peter

Published
2011
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35. De Novo and Inherited Variants in GBF1 are Associated with Axonal Neuropathy Caused by Golgi Fragmentation

Author

Mendoza-Ferreira, Natalia, primary, Karakaya, Mert, additional, Cengiz, Nur, additional, Beijer, Danique, additional, Brigatti, Karlla W., additional, Gonzaga-Jauregui, Claudia, additional, Fuhrmann, Nico, additional, Hölker, Irmgard, additional, Thelen, Maximilian P., additional, Zetzsche, Sebastian, additional, Rombo, Roman, additional, Puffenberger, Erik G., additional, De Jonghe, Peter, additional, Deconinck, Tine, additional, Zuchner, Stephan, additional, Strauss, Kevin A., additional, Carson, Vincent, additional, Schrank, Bertold, additional, Wunderlich, Gilbert, additional, Baets, Jonathan, additional, and Wirth, Brunhilde, additional

Published
2020
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38. Diagnostic implications of genetic copy number variation in epilepsy plus

Author

Coppola, Antonietta, Cellini, Elena, Stamberger, Hannah, Saarentaus, Elmo, Cetica, Valentina, Lal, Dennis, Djemie, Tania, Bartnik-Glaska, Magdalena, Ceulemans, Berten, Cross, J. Helen, Deconinck, Tine, De Masi, Salvatore, Dorn, Thomas, Guerrini, Renzo, Hoffman-Zacharska, Dorotha, Kooy, Frank, Lagae, Lieven, Lench, Nicholas, Lemke, Johannes R., Lucenteforte, Ersilia, Madia, Francesca, Mefford, Heather C., Morrogh, Deborah, Nuernberg, Peter, Palotie, Aarno, Schoonjans, An-Sofie, Striano, Pasquale, Szczepanik, Elzbieta, Tostevin, Anna, Vermeesch, Joris R., Van Esch, Hilde, Van Paesschen, Wim, Waters, Jonathan J., Weckhuysen, Sarah, Zara, Federico, Jonghe, Peter De, Sisodiya, Sanjay M., Marini, Carla, Moller, Rikke S., and Hjalgrim, Helle

Subjects
epilepsy genes, Phenotype, Genotype, DNA Copy Number Variations, mental disorders, array CGH, Humans, Genetic Predisposition to Disease, Comorbidity, SNP array, Epilepsy/complications, copy number variants
Abstract

Objective: Copy number variations (CNVs) represent a significant genetic risk for several neurodevelopmental disorders including epilepsy. As knowledge increases, reanalysis of existing data is essential. Reliable estimates of the contribution of CNVs to epilepsies from sizeable populations are not available. Methods: We assembled a cohort of 1255 patients with preexisting array comparative genomic hybridization or single nucleotide polymorphism array based CNV data. All patients had “epilepsy plus,” defined as epilepsy with comorbid features, including intellectual disability, psychiatric symptoms, and other neurological and nonneurological features. CNV classification was conducted using a systematic filtering workflow adapted to epilepsy. Results: Of 1097 patients remaining after genetic data quality control, 120 individuals (10.9%) carried at least one autosomal CNV classified as pathogenic; 19 individuals (1.7%) carried at least one autosomal CNV classified as possibly pathogenic. Eleven patients (1%) carried more than one (possibly) pathogenic CNV. We identified CNVs covering recently reported (HNRNPU) or emerging (RORB) epilepsy genes, and further delineated the phenotype associated with mutations of these genes. Additional novel epilepsy candidate genes emerge from our study. Comparing phenotypic features of pathogenic CNV carriers to those of noncarriers of pathogenic CNVs, we show that patients with nonneurological comorbidities, especially dysmorphism, were more likely to carry pathogenic CNVs (odds ratio = 4.09, confidence interval = 2.51-6.68; P = 2.34 × 10 −9). Meta-analysis including data from published control groups showed that the presence or absence of epilepsy did not affect the detected frequency of CNVs. Significance: The use of a specifically adapted workflow enabled identification of pathogenic autosomal CNVs in 10.9% of patients with epilepsy plus, which rose to 12.7% when we also considered possibly pathogenic CNVs. Our data indicate that epilepsy with comorbid features should be considered an indication for patients to be selected for a diagnostic algorithm including CNV detection. Collaborative large-scale CNV reanalysis leads to novel declaration of pathogenicity in unexplained cases and can promote discovery of promising candidate epilepsy genes.

Published
2019

39. Hereditary Spastic Paraplegia 3A Associated With Axonal Neuropathy

Author

Ivanova, Neviana, Claeys, Kristl G., Deconinck, Tine, Litvinenko, Ivan, Jordanova, Albena, Auer-Grumbach, Michaela, Haberlova, Jana, Löfgren, Ann, Smeyers, Gisele, Nelis, Eva, Mercelis, Rudy, Plecko, Barbara, Priller, Josef, Zámečník, Josef, Ceulemans, Berten, Erichsen, Anne Kjersti, Björck, Erik, Nicholson, Garth, Sereda, Michael W., Seeman, Pavel, Kremensky, Ivo, Mitev, Vanio, and De Jonghe, Peter

Published
2007

40. Biallelic VARS variants cause developmental encephalopathy with microcephaly that is recapitulated in vars knockout zebrafish

Author

Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], Luxembourg Centre for Systems Biomedicine (LCSB): Experimental Neurobiology (Balling Group) [research center], University of Luxembourg: High Performance Computing - ULHPC [research center], Siekierska, Aleksandra, Stamberger, Hannah, Deconinck, Tine, Oprescu, Stephanie N., Partoens, Michèle, Sourbron, Jo, Zhang, Yifan, Adriaenssens, Elias, Mullen, Patrick, Wiencek, Patrick, Hardies, Katja, Lee, Jeong-Soo, Giong, Hoi-Khoanh, Distelmaier, Felix, Elpeleg, Orly, Helbig, Katherine L., Hersh, Joseph, Isikay, Sedat, Jordan, Elizabeth, Karaca, Ender, Kecskes, Angela, Lupski, James R., Kovacs-Nagy, Reka, May, Patrick, Narayanan, Vinodh, Pendziwiat, Manuela, Ramsey, Keri, Rangasamy, Sampathkumar, Shinde, Deepali, Spiegel, Ronan, Timmerman, Vincent, Von Spiczak, Sarah, Helbig, Ingo, CARCD Research Group, EuroEPINOMICS RES AR working group, Balling, Rudi, Weckhuysen, Sarah, Francklyn, Christopher, Antonellis, Anthony, de Witte, Peter, De Jonghe, Peter, Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], Luxembourg Centre for Systems Biomedicine (LCSB): Experimental Neurobiology (Balling Group) [research center], University of Luxembourg: High Performance Computing - ULHPC [research center], Siekierska, Aleksandra, Stamberger, Hannah, Deconinck, Tine, Oprescu, Stephanie N., Partoens, Michèle, Sourbron, Jo, Zhang, Yifan, Adriaenssens, Elias, Mullen, Patrick, Wiencek, Patrick, Hardies, Katja, Lee, Jeong-Soo, Giong, Hoi-Khoanh, Distelmaier, Felix, Elpeleg, Orly, Helbig, Katherine L., Hersh, Joseph, Isikay, Sedat, Jordan, Elizabeth, Karaca, Ender, Kecskes, Angela, Lupski, James R., Kovacs-Nagy, Reka, May, Patrick, Narayanan, Vinodh, Pendziwiat, Manuela, Ramsey, Keri, Rangasamy, Sampathkumar, Shinde, Deepali, Spiegel, Ronan, Timmerman, Vincent, Von Spiczak, Sarah, Helbig, Ingo, CARCD Research Group, EuroEPINOMICS RES AR working group, Balling, Rudi, Weckhuysen, Sarah, Francklyn, Christopher, Antonellis, Anthony, de Witte, Peter, and De Jonghe, Peter

Abstract

Aminoacyl tRNA synthetases (ARSs) link specific amino acids with their cognate transfer RNAs in a critical early step of protein translation. Mutations in ARSs have emerged as a cause of recessive, often complex neurological disease traits. Here we report an allelic series consisting of seven novel and two previously reported biallelic variants in valyl-tRNA synthetase (VARS) in ten patients with a developmental encephalopathy with microcephaly, often associated with early-onset epilepsy. In silico, in vitro, and yeast complementation assays demonstrate that the underlying pathomechanism of these mutations is most likely a loss of protein function. Zebrafish modeling accurately recapitulated some of the key neurological disease traits. These results provide both genetic and biological insights into neurodevelopmental disease and pave the way for further in-depth research on ARS related recessive disorders and precision therapies.

Published
2019

41. Biallelic VARS variants cause developmental encephalopathy with microcephaly that is recapitulated in vars knockout zebrafish

Author

Siekierska, Aleksandra, Stamberger, Hannah, Deconinck, Tine, Oprescu, Stephanie N., Partoens, Michèle, Zhang, Yifan, Sourbron, Jo, Adriaenssens, Elias, Mullen, Patrick, Wiencek, Patrick, Hardies, Katia, Lee, Jeong-Soo, Giong, Hoi-Khoanh, Distelmaier, Felix, Elpeleg, Orly, Helbig, Katherine L., Hersh, Joseph, Isikay, Sedat, Jordan, Elizabeth, Karaca, Ender, Kecskes, Angela, Lupski, James R., Kovacs-Nagy, Reka, May, Patrick, Narayanan, Vinodh, Pendziwiat, Manuela, Ramsey, Keri, Rangasamy, Sampathkumar, Shinde, Deepali N., Spiegel, Ronen, Timmerman, Vincent, von Spiczak, Sarah, Helbig, Ingo, Weckhuysen, Sarah, Francklyn, Christopher, Antonellis, Anthony, de Witte, Peter, Partoens, Michele, Balak, Chris, Belnap, Newell, Claasen, Ana, Courtright, Amanda, de Both, Matt, Huentelman, Matthew J., Naymik, Marcus, Richholt, Ryan, Siniard, Ashley L., Szelinger, Szabolcs, Craig, David W., Schrauwen, Isabelle, Afawi, Zaid, Balling, Rudi, Baulac, Stephanie, Barisic, Nina, Caglayan, Hande S., Craiu, Dana, Guerrero-Lopez, Rosa, Guerrini, Renzo, Hjalgrim, Helle, Jahn, Johanna, Klein, Karl Martin, Leguern, Eric, Lemke, Johannes R., Lerche, Holger, Marini, Carla, Moller, Rikke S., Muhle, Hiltrud, Rosenow, Felix, Serratosa, Jose, Suls, Arvid, Stephani, Ulrich, Sterbova, Katalin, Striano, Pasquale, Zara, Federico, De Jonghe, Peter, C4RCD Research Group, AR working group of the EuroEPINOMICS RES Consortium, and HKÜ, Sağlık Bilimleri Yüksekokulu, Fizyoterapi ve Rehabilitasyon Bölümü

Subjects
0301 basic medicine, Male, Models, Molecular, Microcephaly, TRANSFER-RNA-SYNTHETASE, ILAE COMMISSION, MUTATIONS CAUSE, ONSET, GENES, HYPOMYELINATION, BIOGENESIS, PHENOTYPE, TRNA(VAL), MECHANISM, General Physics and Astronomy, 02 engineering and technology, chemistry.chemical_compound, Gene Knockout Techniques, Loss of Function Mutation, lcsh:Science, Zebrafish, Genetics, Brain Diseases, Multidisciplinary, biology, 021001 nanoscience & nanotechnology, Phenotype, 3. Good health, Pedigree, ddc, Complementation, Female, 0210 nano-technology, Engineering sciences. Technology, Valine-tRNA Ligase, In silico, Science, General Biochemistry, Genetics and Molecular Biology, Article, Cell Line, 03 medical and health sciences, Prosencephalon, medicine, Animals, Humans, Genetic Predisposition to Disease, Allele, Gene, Biology, Alleles, AR working group of the EuroEPINOMICS RES Consortium, Epilepsy, Aminoacyl tRNA synthetase, fungi, General Chemistry, Fibroblasts, biology.organism_classification, medicine.disease, Disease Models, Animal, 030104 developmental biology, chemistry, C4RCD Research Group, Neurodevelopmental Disorders, lcsh:Q, Human medicine
Abstract

Aminoacyl tRNA synthetases (ARSs) link specific amino acids with their cognate transfer RNAs in a critical early step of protein translation. Mutations in ARSs have emerged as a cause of recessive, often complex neurological disease traits. Here we report an allelic series consisting of seven novel and two previously reported biallelic variants in valyl-tRNA synthetase (VARS) in ten patients with a developmental encephalopathy with microcephaly, often associated with early-onset epilepsy. In silico, in vitro, and yeast complementation assays demonstrate that the underlying pathomechanism of these mutations is most likely a loss of protein function. Zebrafish modeling accurately recapitulated some of the key neurological disease traits. These results provide both genetic and biological insights into neurodevelopmental disease and pave the way for further in-depth research on ARS related recessive disorders and precision therapies., tRNAs are linked with their cognate amino acid by aminoacyl tRNA synthetases (ARS). Here, the authors report a developmental encephalopathy associated with biallelic VARS variants (valyl-tRNA synthetase) that lead to loss of function, as determined by several in vitro assays and a vars knockout zebrafish model.

Published
2018

42. Truncating SLC5A7 mutations underlie a spectrum of dominant hereditary motor neuropathies

Author

Salter, Claire G., Beijer, Danique, Hardy, Holly, Barwick, Katy E. S., Bower, Matthew, Mademan, Inès, De Jonghe, Peter, Deconinck, Tine, Russell, Mark A., McEntagart, Meriel M., Chioza, Barry A., Blakely, Randy D., Chilton, John K., De Bleecker, Jan, Baets, Jonathan, Baple, Emma L., Walk, David, and Crosby, Andrew H.

Subjects
CONGENITAL MYASTHENIC SYNDROMES, Medicine and Health Sciences, LOCALIZATION, Human medicine, AFFINITY CHOLINE TRANSPORTER, NEUROMUSCULAR-JUNCTION
Abstract

Objective : To identify the genetic cause of disease in 2 previously unreported families with forms of distal hereditary motor neuropathies (dHMNs). Methods : The first family comprises individuals affected by dHMN type V, which lacks the cardinal clinical feature of vocal cord paralysis characteristic of dHMN-VII observed in the second family. Next-generation sequencing was performed on the proband of each family. Variants were annotated and filtered, initially focusing on genes associated with neuropathy. Candidate variants were further investigated and confirmed by dideoxy sequence analysis and cosegregation studies. Thorough patient phenotyping was completed, comprising clinical history, examination, and neurologic investigation. Results : dHMNs are a heterogeneous group of peripheral motor neuron disorders characterized by length-dependent neuropathy and progressive distal limb muscle weakness and wasting. We previously reported a dominant-negative frameshift mutation located in the concluding exon of the SLC5A7 gene encoding the choline transporter (CHT), leading to protein truncation, as the likely cause of dominantly-inherited dHMN-VII in an extended UK family. In this study, our genetic studies identified distinct heterozygous frameshift mutations located in the last coding exon of SLC5A7, predicted to result in the truncation of the CHT C-terminus, as the likely cause of the condition in each family. Conclusions : This study corroborates C-terminal CHT truncation as a cause of autosomal dominant dHMN, confirming upper limb predominating over lower limb involvement, and broadening the clinical spectrum arising from CHT malfunction.

Published
2018

43. Nonsense mutations in alpha-II spectrin in three families with juvenile onset hereditary motor neuropathy

Author

Beijer, Danique, primary, Deconinck, Tine, additional, De Bleecker, Jan L, additional, Dotti, Maria Teresa, additional, Malandrini, Alessandro, additional, Urtizberea, J Andoni, additional, Zulaica, Miren, additional, López de Munain, Adolfo, additional, Asselbergh, Bob, additional, De Jonghe, Peter, additional, and Baets, Jonathan, additional

Published
2019
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44. FAHN/SPG35: a narrow phenotypic spectrum across disease classifications

Author

Rattay, Tim W, primary, Lindig, Tobias, additional, Baets, Jonathan, additional, Smets, Katrien, additional, Deconinck, Tine, additional, Söhn, Anne S, additional, Hörtnagel, Konstanze, additional, Eckstein, Kathrin N, additional, Wiethoff, Sarah, additional, Reichbauer, Jennifer, additional, Döbler-Neumann, Marion, additional, Krägeloh-Mann, Ingeborg, additional, Auer-Grumbach, Michaela, additional, Plecko, Barbara, additional, Münchau, Alexander, additional, Wilken, Bernd, additional, Janauschek, Marc, additional, Giese, Anne-Katrin, additional, De Bleecker, Jan L, additional, Ortibus, Els, additional, Debyser, Martine, additional, Lopez de Munain, Adolfo, additional, Pujol, Aurora, additional, Bassi, Maria Teresa, additional, D’Angelo, Maria Grazia, additional, De Jonghe, Peter, additional, Züchner, Stephan, additional, Bauer, Peter, additional, Schöls, Ludger, additional, and Schüle, Rebecca, additional

Published
2019
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45. Loss of paraplegin drives spasticity rather than ataxia in a cohort of 241 patients with SPG7

Author

Coarelli, Giulia, Schule, Rebecca, van de Warrenburg, Bart P C, De Jonghe, Peter, Ewenczyk, Claire, Martinuzzi, Andrea, Synofzik, Matthis, Hamer, Elisa E.G., Baets, Jonathan, Anheim, Mathieu, Schöls, Lüdger, Deconinck, Tine, Masrori, Pegah, Fontaine, Bertrand, Klockgether, Thomas, D'Angelo, Maria Grazia, Monin, Marie Lorraine, De Bleecker, Jan, Migeotte, Isabelle, Charles, Perrine, Bassi, Maria Teresa, Klopstock, Thomas, Mochel, Fanny, Ollagnon-Roman, Elisabeth, D'Hooghe, Marc, Kamm, Christoph, Kurzwelly, Delia, Papin, Melanie, Davoine, Claire Sophie, Banneau, Guillaume, du Montcel, Sophie Tezenas, Seilhean, Danielle, Brice, Alexis, Duyckaerts, Charles, Stevanin, Giovanni, Dürr, Alexandra, Coarelli, Giulia, Schule, Rebecca, van de Warrenburg, Bart P C, De Jonghe, Peter, Ewenczyk, Claire, Martinuzzi, Andrea, Synofzik, Matthis, Hamer, Elisa E.G., Baets, Jonathan, Anheim, Mathieu, Schöls, Lüdger, Deconinck, Tine, Masrori, Pegah, Fontaine, Bertrand, Klockgether, Thomas, D'Angelo, Maria Grazia, Monin, Marie Lorraine, De Bleecker, Jan, Migeotte, Isabelle, Charles, Perrine, Bassi, Maria Teresa, Klopstock, Thomas, Mochel, Fanny, Ollagnon-Roman, Elisabeth, D'Hooghe, Marc, Kamm, Christoph, Kurzwelly, Delia, Papin, Melanie, Davoine, Claire Sophie, Banneau, Guillaume, du Montcel, Sophie Tezenas, Seilhean, Danielle, Brice, Alexis, Duyckaerts, Charles, Stevanin, Giovanni, and Dürr, Alexandra

Abstract

Objective: We took advantage of a large multinational recruitment to delineate genotype-phenotype correlations in a large, trans-European multicenter cohort of patients with spastic paraplegia gene 7 (SPG7). Methods: We analyzed clinical and genetic data from 241 patients with SPG7, integrating neurologic follow-up data. One case was examined neuropathologically. Results: Patients with SPG7 had a mean age of 35.5 ± 14.3 years (n = 233) at onset and presented with spasticity (n = 89), ataxia (n = 74), or both (n = 45). At the first visit, patients with a longer disease duration (>20 years, n = 62) showed more cerebellar dysarthria (p < 0.05), deep sensory loss (p < 0.01), muscle wasting (p < 0.01), ophthalmoplegia (p < 0.05), and sphincter dysfunction (p < 0.05) than those with a shorter duration (<10 years, n = 93). Progression, measured by Scale for the Assessment and Rating of Ataxia evaluations, showed a mean annual increase of 1.0 ± 1.4 points in a subgroup of 30 patients. Patients homozygous for loss of function (LOF) variants (n = 65) presented significantly more often with pyramidal signs (p < 0.05), diminished visual acuity due to optic atrophy (p < 0.0001), and deep sensory loss (p < 0.0001) than those with at least 1 missense variant (n = 176). Patients with at least 1 Ala510Val variant (58%) were older (age 37.6 ± 13.7 vs 32.8 ± 14.6 years, p < 0.05) and showed ataxia at onset (p < 0.05). Neuropathologic examination revealed reduction of the pyramidal tract in the medulla oblongata and moderate loss of Purkinje cells and substantia nigra neurons. Conclusions: This is the largest SPG7 cohort study to date and shows a spasticity-predominant phenotype of LOF variants and more frequent cerebellar ataxia and later onset in patients carrying at least 1 Ala510Val variant., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2018

46. 16p11.2 600 kb Duplications confer risk for typical and atypical Rolandic epilepsy

Author

Reinthaler, Eva M., Lal, Dennis, Lebon, Sebastien, Hildebrand, Michael S., Dahl, Hans-Henrik M., Regan, Brigid M., Feucht, Martha, Steinböck, Hannelore, Neophytou, Birgit, Ronen, Gabriel M., Roche, Laurian, Gruber-Sedlmayr, Ursula, Geldner, Julia, Haberlandt, Edda, Hoffmann, Per, Herms, Stefan, Gieger, Christian, Waldenberger, Melanie, Franke, Andre, Wittig, Michael, Schoch, Susanne, Becker, Albert J., Hahn, Andreas, Männik, Katrin, Toliat, Mohammad R., Winterer, Georg, Lerche, Holger, Nürnberg, Peter, Mefford, Heather, Scheffer, Ingrid E., Berkovic, Samuel F., Beckmann, Jacques S., Sander, Thomas, Jacquemont, Sebastien, Reymond, Alexandre, Zimprich, Fritz, Neubauer, Bernd A., Neubauer, Bernd, Mörzinger, Martina, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Helbig, Ingo, Muhle, Hiltrud, Ostertag, Philipp, von Spiczak, Sarah, Stephani, Ulrich, Trucks, Holger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Rosenow, Felix, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Becker, Felicitas, Weber, Yvonne, Koeleman, Bobby P.C., de Kovel, Carolien, Lindhout, Dick, Ameil, Agnès, Andrieux, Joris, Bouquillon, Sonia, Boute, Odile, de Flandre, Jeanne, Cuisset, Jean Marie, Cuvellier, Jean-Christophe, Salengro, Roger, David, Albert, de Vries, Bert, Delrue, Marie-Ange, Doco-Fenzy, Martine, Fernandez, Bridget A., Heron, Delphine, Keren, Boris, Lebel, Robert, Leheup, Bruno, Lewis, Suzanne, Mencarelli, Maria Antonietta, Mignot, Cyril, Minet, Jean-Claude, Moerman, Alexandre, Morice-Picard, Fanny, Mucciolo, Mafalda, Ounap, Katrin, Pasquier, Laurent, Petit, Florence, Ragona, Francesca, Rajcan-Separovic, Evica, Renieri, Alessandra, Rieubland, Claudine, Sanlaville, Damien, Sarrazin, Elisabeth, Shen, Yiping, van Haelst, Mieke, and Silfhout, Anneke Vulto-van

Abstract

Rolandic epilepsy (RE) is the most common idiopathic focal childhood epilepsy. Its molecular basis is largely unknown and a complex genetic etiology is assumed in the majority of affected individuals. The present study tested whether six large recurrent copy number variants at 1q21, 15q11.2, 15q13.3, 16p11.2, 16p13.11 and 22q11.2 previously associated with neurodevelopmental disorders also increase risk of RE. Our association analyses revealed a significant excess of the 600 kb genomic duplication at the 16p11.2 locus (chr16: 29.5-30.1 Mb) in 393 unrelated patients with typical (n = 339) and atypical (ARE; n = 54) RE compared with the prevalence in 65 046 European population controls (5/393 cases versus 32/65 046 controls; Fisher's exact test P = 2.83 × 10−6, odds ratio = 26.2, 95% confidence interval: 7.9-68.2). In contrast, the 16p11.2 duplication was not detected in 1738 European epilepsy patients with either temporal lobe epilepsy (n = 330) and genetic generalized epilepsies (n = 1408), suggesting a selective enrichment of the 16p11.2 duplication in idiopathic focal childhood epilepsies (Fisher's exact test P = 2.1 × 10−4). In a subsequent screen among children carrying the 16p11.2 600 kb rearrangement we identified three patients with RE-spectrum epilepsies in 117 duplication carriers (2.6%) but none in 202 carriers of the reciprocal deletion. Our results suggest that the 16p11.2 duplication represents a significant genetic risk factor for typical and atypical RE

Published
2017

49. STUB1/CHIP mutations cause Gordon Holmes syndrome as part of a widespread multisystemic neurodegeneration: evidence from four novel mutations

Author

Hayer, Stefanie Nicole, Deconinck, Tine, Bender, Benjamin, Smets, Katrien, Züchner, Stephan, Reich, Selina, Schöls, Ludger, Schüle, Rebecca, De Jonghe, Peter, Baets, Jonathan, and Synofzik, Matthis

Subjects
Adult, Male, Cerebellar Ataxia, Ubiquitin-Protein Ligases, diagnostic imaging [Neurodegenerative Diseases], genetics [Hypogonadism], Neurodegenerative disease, Gonadotropin-Releasing Hormone, Magnetic resonance imaging, metabolism [Ubiquitin-Protein Ligases], Protein Domains, genetics [Gonadotropin-Releasing Hormone], Recessive ataxia, Humans, Genetics(clinical), Pharmacology (medical), ddc:610, Amino Acid Sequence, Neurodegeneration, STUB1 protein, human, Medicine(all), genetics [Ubiquitin-Protein Ligases], genetics [Cerebellar Ataxia], CHIP, Hypogonadism, Research, pathology [Neurodegenerative Diseases], Spastic ataxia, Neurodegenerative Diseases, deficiency [Gonadotropin-Releasing Hormone], Middle Aged, Pedigree, Early onset ataxia, Gordon Holmes syndrome, genetics [Neurodegenerative Diseases], Mutation, Early-onset dementia, Ataxia, Dementia, Female, Human medicine
Abstract

Background CHIP, the protein encoded by STUB1, is a central component of cellular protein homeostasis and interacts with several key proteins involved in the pathogenesis of manifold neurodegenerative diseases. This gives rise to the hypothesis that mutations in STUB1 might cause a far more multisystemic neurodegenerative phenotype than the previously reported cerebellar ataxia syndrome. Methods Whole exome sequencing data-sets from n = 87 index subjects of two ataxia cohorts were screened for individuals with STUB1 mutations. In-depth phenotyping by clinical evaluation and neuroimaging was performed in mutation carriers. Results We identified four novel STUB1 mutations in three affected subjects from two index families (frequency 2/87 = 2.3%). All three subjects presented with a severe multisystemic phenotype including severe dementia, spastic tetraparesis, epilepsy, and autonomic dysfunction in addition to cerebellar ataxia, plus hypogonadism in one index patient. Diffusion tensor imaging revealed degeneration of manifold supra- and infratentorial tracts. Conclusions Our findings provide clinical and imaging support for the notion that CHIP is a crucial converging point of manifold neurodegenerative processes, corresponding with its universal biological function in neurodegeneration. Further, our data reveal the second STUB1 family with ataxia plus hypogonadism reported so far, demonstrating that Gordon Holmes syndrome is indeed a recurrent manifestation of STUB1. However, it does not present in isolation, but as part of a broad multisystemic neurodegenerative process. This supports the notion that STUB1 disease should be conceptualized not by historical or clinical syndromic names, but as a variable multisystemic disease defined by disturbed function of the underlying STUB1 gene, which translates into a multidimensional gradual spectrum of variably associated clinical signs and symptoms. Electronic supplementary material The online version of this article (doi:10.1186/s13023-017-0580-x) contains supplementary material, which is available to authorized users.

Published
2017

50. Hereditary spastic paraplegia type 5: natural history, biomarkers and a randomized controlled trial

Author

Schoels, Ludger Rattay, Tim W. Martus, Peter Meisner, Christoph Baets, Jonathan Fischer, Imma Jaegle, Christine and Fraidakis, Matthew J. Martinuzzi, Andrea Saute, Jonas Alex and Scarlato, Marina Antenora, Antonella Stendel, Claudia and Hoeflinger, Philip Lourenco, Charles Marques Abreu, Lisa and Smets, Katrien Paucar, Martin Deconinck, Tine Bis, Dana M. and Wiethoff, Sarah Bauer, Peter Arnoldi, Alessia Marques, Wilson Jardim, Laura Bannach Hauser, Stefan Criscuolo, Chiara Filla, Alessandro Zuchner, Stephan Bassi, Maria Teresa Klopstock, Thomas De Jonghe, Peter Bjorkhem, Ingemar and Schuele, Rebecca

Subjects
polycyclic compounds, lipids (amino acids, peptides, and proteins)
Abstract

SPG5 is a rare subtype of Hereditary Spastic Paraplegia caused by mutations in the oxysterol-7 alpha-hydroxylase gene CYP7B1. Schols et al. study properties of lipid biomarkers in SPG5 and evaluate a treatment strategy targeting oxysterol accumulation in a randomized controlled trial (STOP-SPG5).Spastic paraplegia type 5 (SPG5) is a rare subtype of hereditary spastic paraplegia, a highly heterogeneous group of neurodegenerative disorders defined by progressive neurodegeneration of the corticospinal tract motor neurons. SPG5 is caused by recessive mutations in the gene CYP7B1 encoding oxysterol-7 alpha-hydroxylase. This enzyme is involved in the degradation of cholesterol into primary bile acids. CYP7B1 deficiency has been shown to lead to accumulation of neurotoxic oxysterols. In this multicentre study, we have performed detailed clinical and biochemical analysis in 34 genetically confirmed SPG5 cases from 28 families, studied dose-dependent neurotoxicity of oxysterols in human cortical neurons and performed a randomized placebo-controlled double blind interventional trial targeting oxysterol accumulation in serum of SPG5 patients. Clinically, SPG5 manifested in childhood or adolescence (median 13 years). Gait ataxia was a common feature. SPG5 patients lost the ability to walk independently after a median disease duration of 23 years and became wheelchair dependent after a median 33 years. The overall cross-sectional progression rate of 0.56 points on the Spastic Paraplegia Rating Scale per year was slightly lower than the longitudinal progression rate of 0.80 points per year. Biochemically, marked accumulation of CYP7B1 substrates including 27-hydroxycholesterol was confirmed in serum (n = 19) and cerebrospinal fluid (n = 17) of SPG5 patients. Moreover, 27-hydroxycholesterol levels in serum correlated with disease severity and disease duration. Oxysterols were found to impair metabolic activity and viability of human cortical neurons at concentrations found in SPG5 patients, indicating that elevated levels of oxysterols might be key pathogenic factors in SPG5. We thus performed a randomized placebo-controlled trial (EudraCT 2015-000978-35) with atorvastatin 40 mg/day for 9 weeks in 14 SPG5 patients with 27-hydroxycholesterol levels in serum as the primary outcome measure. Atorvastatin, but not placebo, reduced serum 27-hydroxycholesterol from 853 ng/ml [interquartile range (IQR) 683-1113] to 641 (IQR 507-694) (-31.5%, P = 0.001, Mann-Whitney U-test). Similarly, 25-hydroxycholesterol levels in serum were reduced. In cerebrospinal fluid 27-hydroxycholesterol was reduced by 8.4% but this did not significantly differ from placebo. As expected, no effects were seen on clinical outcome parameters in this short-term trial. In this study, we define the mutational and phenotypic spectrum of SPG5, examine the correlation of disease severity and progression with oxysterol concentrations, and demonstrate in a randomized controlled trial that atorvastatin treatment can effectively lower 27-hydroxycholesterol levels in serum of SPG5 patients. We thus demonstrate the first causal treatment strategy in hereditary spastic paraplegia.

Published
2017

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