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1. Comprehensive long‐term efficacy and safety of recombinant human alpha‐mannosidase (velmanase alfa) treatment in patients with alpha‐mannosidosis

Author

Lund, Allan M, Borgwardt, Line, Cattaneo, Federica, Ardigò, Diego, Geraci, Silvia, Gil‐Campos, Mercedes, De Meirleir, Linda, Laroche, Cécile, Dolhem, Philippe, Cole, Duncan, Tylki‐Szymanska, Anna, Lopez‐Rodriguez, Monica, Guillén‐Navarro, Encarna, Dali, Christine I, Héron, Bénédicte, Fogh, Jens, Muschol, Nicole, Phillips, Dawn, Van den Hout, JM Hannerieke, Jones, Simon A, Amraoui, Yasmina, Harmatz, Paul, and Guffon, Nathalie

Subjects
Biomedical and Clinical Sciences, Clinical Sciences, Clinical Trials and Supportive Activities, Clinical Research, 6.1 Pharmaceuticals, Evaluation of treatments and therapeutic interventions, Activities of Daily Living, Adolescent, Adult, Child, Enzyme Replacement Therapy, Europe, Female, Follow-Up Studies, Humans, Male, Quality of Life, Recombinant Proteins, Severity of Illness Index, Treatment Outcome, Young Adult, alpha-Mannosidase, alpha-Mannosidosis, Alpha-mannosidosis, Recombinant human alpha-mannosidase, Lysosomal storage disorder, Enzyme replacement therapy, Velmanase alfa, Integrated analysis, Genetics & Heredity, Genetics, Clinical sciences
Abstract

IntroductionLong-term outcome data provide important insights into the clinical utility of enzyme replacement therapies. Such data are presented for velmanase alfa in the treatment of alpha-mannosidosis (AM).MethodsPatient data (n = 33; 14 adults, 19 paediatric) from the clinical development programme for velmanase alfa were integrated in this prospectively-designed analysis of long-term efficacy and safety. Patients who participated in the phase I/II or phase III trials and were continuing to receive treatment after completion of the trials were invited to participate in a comprehensive evaluation visit to assess long-term outcomes. Primary endpoints were changes in serum oligosaccharide and the 3-minute stair climb test (3MSCT).ResultsMean (SD) treatment exposure was 29.3 (15.2) months. Serum oligosaccharide levels were significantly reduced in the overall population at 12 months (mean change: -72.7%, P

Published
2018

2. Biallelic mutations in the 3′ exonuclease TOE1 cause pontocerebellar hypoplasia and uncover a role in snRNA processing

Author

Lardelli, Rea M, Schaffer, Ashleigh E, Eggens, Veerle RC, Zaki, Maha S, Grainger, Stephanie, Sathe, Shashank, Van Nostrand, Eric L, Schlachetzki, Zinayida, Rosti, Basak, Akizu, Naiara, Scott, Eric, Silhavy, Jennifer L, Heckman, Laura Dean, Rosti, Rasim Ozgur, Dikoglu, Esra, Gregor, Anne, Guemez-Gamboa, Alicia, Musaev, Damir, Mande, Rohit, Widjaja, Ari, Shaw, Tim L, Markmiller, Sebastian, Marin-Valencia, Isaac, Davies, Justin H, de Meirleir, Linda, Kayserili, Hulya, Altunoglu, Umut, Freckmann, Mary Louise, Warwick, Linda, Chitayat, David, Blaser, Susan, Çağlayan, Ahmet Okay, Bilguvar, Kaya, Per, Huseyin, Fagerberg, Christina, Christesen, Henrik T, Kibaek, Maria, Aldinger, Kimberly A, Manchester, David, Matsumoto, Naomichi, Muramatsu, Kazuhiro, Saitsu, Hirotomo, Shiina, Masaaki, Ogata, Kazuhiro, Foulds, Nicola, Dobyns, William B, Chi, Neil C, Traver, David, Spaccini, Luigina, Bova, Stefania Maria, Gabriel, Stacey B, Gunel, Murat, Valente, Enza Maria, Nassogne, Marie-Cecile, Bennett, Eric J, Yeo, Gene W, Baas, Frank, Lykke-Andersen, Jens, and Gleeson, Joseph G

Subjects
Biological Sciences, Bioinformatics and Computational Biology, Genetics, Alleles, Animals, Cerebellar Diseases, Exonucleases, Female, Humans, Male, Mice, Mutation, Neurodegenerative Diseases, Nuclear Proteins, RNA, Messenger, RNA, Small Nuclear, Spliceosomes, Zebrafish, Medical and Health Sciences, Developmental Biology, Agricultural biotechnology, Bioinformatics and computational biology
Abstract

Deadenylases are best known for degrading the poly(A) tail during mRNA decay. The deadenylase family has expanded throughout evolution and, in mammals, consists of 12 Mg2+-dependent 3'-end RNases with substrate specificity that is mostly unknown. Pontocerebellar hypoplasia type 7 (PCH7) is a unique recessive syndrome characterized by neurodegeneration and ambiguous genitalia. We studied 12 human families with PCH7, uncovering biallelic, loss-of-function mutations in TOE1, which encodes an unconventional deadenylase. toe1-morphant zebrafish displayed midbrain and hindbrain degeneration, modeling PCH-like structural defects in vivo. Surprisingly, we found that TOE1 associated with small nuclear RNAs (snRNAs) incompletely processed spliceosomal. These pre-snRNAs contained 3' genome-encoded tails often followed by post-transcriptionally added adenosines. Human cells with reduced levels of TOE1 accumulated 3'-end-extended pre-snRNAs, and the immunoisolated TOE1 complex was sufficient for 3'-end maturation of snRNAs. Our findings identify the cause of a neurodegenerative syndrome linked to snRNA maturation and uncover a key factor involved in the processing of snRNA 3' ends.

Published
2017

6. Clinical, biochemical and genetic spectrum of 70 patients with ACAD9 deficiency: is riboflavin supplementation effective?

Author

Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, and Wortmann, Saskia

Published
2018
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10. Clinical, neuroradiological and genetic findings in pontocerebellar hypoplasia

Author

Namavar, Yasmin, Barth, Peter G., Kasher, Paul R., van Ruissen, Fred, Brockmann, Knut, Bernert, Günther, Writzl, Karin, Ventura, Karen, Cheng, Edith Y., Ferriero, Donna M., Basel-Vanagaite, Lina, Eggens, Veerle R. C., Krägeloh-Mann, Ingeborg, De Meirleir, Linda, King, Mary, Graham, John M., Jr, von Moers, Arpad, Knoers, Nine, Sztriha, Laszlo, Korinthenberg, Rudolf, Consortium, PCH, Dobyns, William B., Baas, Frank, and Poll-The, Bwee Tien

Published
2011
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11. Transatlantic combined and comparative data analysis of 1095 patients with urea cycle disorders-A successful strategy for clinical research of rare diseases

Author

Posset, Roland, Garbade, Sven F., Boy, Nikolas, Burlina, Alberto B., Dionisi-Vici, Carlo, Dobbelaere, Dries, Garcia-Cazorla, Angeles, de Lonlay, Pascale, Teles, Elisa Leao, Vara, Roshni, Mew, Nicholas Ah., Batshaw, Mark L., Baumgartner, Matthias R., McCandless, Shawn, Seminara, Jennifer, Summar, Marshall, Hoffmann, Georg F., Koelker, Stefan, Burgard, Peter, Bloxam, Sondra, Brody, Linnea, Caspi, Liora, Elsbecker, Sara, Fierro, Luca, Lynn, Audrey, Mullins, Mary, Mutze, Ulrike, Papaleo, Cassandra, Payan, Irma, Simpson, Kara, Singer, Rebecca, Wallis, Kimberly, Alber, Fabienne Dietrich, Babikian, Talin, Bender, Heidi, Boys, Christopher, Breiger, David, Buerger, Corinna, Caudle, Susan E., Nguyen-Driver, Mina, Kerr, Elizabeth, Mamak, Eva, Sanz, Jacqueline H., Tangen, Rachel, Wilkening, Greta, Cederbaum, Stephen, Feigenbaum, Annette, Kerr, Douglas S., Lichter-Konecki, Uta, Seashore, Margretta R., Berry, Susan A., Burrage, Lindsay, Coughlin, Curtis, Diaz, George A., Gallagher, Renata C., Gropman, Andrea, Harding, Cary O., Lee, Brendan, Le Mons, Cynthia, Merritt, J. Lawrence, II, Nagamani, Sandesh C. S., Schulze, Andreas, Stricker, Tamar, Tuchman, Mendel, Waisbren, Susan, Weisfeld-Adams, James, Wong, Derek, Yudkoff, Marc, Arnoux, Jean-Baptiste, Baric, Ivo, Bosch, Annet M., Chabrol, Brigitte, Chakrapani, Anupam, Cortes-Saladefont, Elisenda, Couce, Maria L., Eyskens, François, de Laet, Corine, de Meirleir, Linda, Freisinger, Peter, Gleich, Florian, Grunewald, Stephanie, Haberle, Johannes, Hwu, Wuh-Liang, Jalan, Anil, Karall, Daniela, Lindner, Martin, Lund, Allan M., Martinelli, Diego, Murphy, Elaine, Muehlhausen, Chris, Olivieri, Giorgia, Ottolenghi, Chris, Rodrigues, Esmeralda, Rubert, Laura, Sarajlija, Adrijan, Schiff, Manuel, Sokal, Etienne, Sykut-Cegielska, Jolanta, Walter, John H., Williams, Monique, Zeman, Jiri, Pediatric surgery, Clinical chemistry, AGEM - Endocrinology, metabolism and nutrition, AGEM - Inborn errors of metabolism, Amsterdam Reproduction & Development (AR&D), Pediatrics, Paediatric Metabolic Diseases, University of Zurich, Burgard, Peter, UCL - SSS/IREC/PEDI - Pôle de Pédiatrie, UCL - (SLuc) Service de gastro-entérologie et hépatologie pédiatrique, UCDC, and E-IMD Consortium

Subjects
0301 basic medicine, Male, Data Analysis, Urea Cycle Disorders, Delayed Diagnosis, medicine.medical_treatment, 030105 genetics & heredity, Liver transplantation, Neurodegenerative, Cohort Studies, 0302 clinical medicine, Urea, Genetics(clinical), Urea Cycle Disorders, Inborn, Genetics (clinical), Ornithine transcarbamylase deficiency, Pediatric, Genetics & Heredity, screening and diagnosis, diagnostic methods, international registry and database, Europe, Detection, Urea cycle Disorders, Urea cycle, Female, medicine.symptom, Cohort study, 4.2 Evaluation of markers and technologies, medicine.medical_specialty, 2716 Genetics (clinical), Clinical Sciences, Late onset, 610 Medicine & health, Asymptomatic, Article, 03 medical and health sciences, Rare Diseases, Neonatal Screening, 1311 Genetics, Clinical Research, Internal medicine, medicine, Genetics, Humans, Newborn screening, business.industry, Infant, Newborn, Infant, Additional individual contributors of the UCDC and the E-IMD consortium, medicine.disease, Newborn, Ornithine Carbamoyltransferase Deficiency Disease, Clinical research, Inborn, Good Health and Well Being, 10036 Medical Clinic, North America, Human medicine, business, Digestive Diseases, 030217 neurology & neurosurgery
Abstract

ollaborators: Bloxam S, Brody L, Caspi L, Elsbecker S, Fierro L, Lynn A, Mullins M, Mütze U, Papaleo C, Payan I, Seminara J, Simpson K, Singer R, Wallis K, Alber FD, Babikian T, Bender H, Boys C, Breiger D, Buerger C, Caudle SE, NguyenDriver M, Kerr E, Mamak E, Sanz JH, Tangen R, Wilkening G, Cederbaum S, Feigenbaum A, Kerr DS, LichterKonecki U, Seashore MR, Berry SA, Burrage L, Coughlin C, Diaz GA, Gallagher RC, Gropman A, Harding CO, Lee B, Le Mons C, Lawrence Merritt J 2nd, Nagamani SCS, Schulze A, Stricker T, Tuchman M, Waisbren S, WeisfeldAdams J, Wong D, Yudkoff M, Arnoux J, Bari Cacute I, Bosch AM, Chabrol B, Chakrapani A, CortèsSaladefont E, Couce ML, Eyskens F, de Laet C, de Meirleir L, Freisinger P, Gleich F, Grünewald S, Häberle J, Hwu W, Jalan A, Karall D, Lindner M, Lund AM, Martinelli D, Murphy E, Mühlhausen C, Olivieri G, Ottolenghi C, Rodrigues E, Rubert L, Sarajlija A, Schiff M, Sokal E, SykutCegielska J, Walter JH, Williams M, Zeman J. BACKGROUND: To improve our understanding of urea cycle disorders (UCDs) prospectively followed by two North American (NA) and European (EU) patient cohorts. AIMS: Description of the NA and EU patient samples and investigation of the prospects of combined and comparative analyses for individuals with UCDs. METHODS: Retrieval and comparison of the data from 1095 individuals (NA: 620, EU: 475) from two electronic databases. RESULTS: The proportion of females with ornithine transcarbamylase deficiency (fOTC-D), particularly those being asymptomatic (asfOTC-D), was higher in the NA than in the EU sample. Exclusion of asfOTC-D resulted in similar distributions in both samples. The mean age at first symptoms was higher in NA than in EU patients with late onset (LO), but similar for those with early (≤ 28 days) onset (EO) of symptoms. Also, the mean age at diagnosis and diagnostic delay for EO and LO patients were similar in the NA and EU cohorts. In most patients (including fOTC-D), diagnosis was made after the onset of symptoms (59.9%) or by high-risk family screening (24.7%), and less often by newborn screening (8.9%) and prenatal testing (3.7%). Analysis of clinical phenotypes revealed that EO patients presented with more symptoms than LO individuals, but that numbers of symptoms correlated with plasma ammonium concentrations in EO patients only. Liver transplantation was reported for 90 NA and 25 EU patients. CONCLUSIONS: Combined analysis of databases drawn from distinct populations opens the possibility to increase sample sizes for natural history questions, while comparative analysis utilizing differences in approach to treatment can evaluate therapeutic options and enhance long-term outcome studies.

Published
2019

12. Parenteral hydroxocobalamin dose intensification in five patients with different types of early onset intracellular cobalamin defects : Clinical and biochemical responses

Author

Scalais, Emmanuel, Osterheld, Elise, Geron, Christine, Pierron, Charlotte, Chafai, Ronit, Schlesser, Vincent, Borde, Patricia, Regal, Luc, Laeremans, Hilde, van Gassen, Koen L I, van den Heuvel, L Bert, De Meirleir, Linda, Scalais, Emmanuel, Osterheld, Elise, Geron, Christine, Pierron, Charlotte, Chafai, Ronit, Schlesser, Vincent, Borde, Patricia, Regal, Luc, Laeremans, Hilde, van Gassen, Koen L I, van den Heuvel, L Bert, and De Meirleir, Linda

Published
2019

13. Research activity and capability in the European reference network MetabERN

Author

Heard, Jean Michel, Bellettato, Cinzia, Van Lingen, Corine, Scarpa, Maurizio, Debray, François Guillaume, Nassogne, Marie Cécile, Van Coster, Rudy, De Meirleir, Linda, Eyskens, François, Morava, Eva, Baric, Ivo, Kozich, Viktor, Lund, Allan Meldgaard, Germain, Dominique, Belmatoug, Nadia, Guffon, Nathalie, Labrune, Philippe, Gouya, Laurent, De Lonlay, Pascale, Schiff, Manuel, Dobbelaere, Dries, Chabrol, Brigitte, Das, Anihb Martin, Spiekerkoetter, Ute, Rutsch, Frank, Ploeckinger, Ursula, Mohnike, Klaus, Hahn, Andreas, Kölker, Stefan, Ullrich, Kurt, Balogh, István, Bembi, Bruno, Donati, Maria Alice, Gasperini, Serena, Parenti, Giancarlo, Salviati, Alessandro, Vici, Carlo Dionisi, Di Rocco, Maja, Cefalo, Graziella, Burlina, Alberto, Ceccarini, Giovanni, Federico, Antonio, Van Der Ploeg, Ans, Rubio-Gozalbo, Maria Estela, Van Spronsen, Francian, Visser, Gepke, Bosch, Annet, Tangeraas, Trine, Sanderberg, Sverre, Kieć-Wilk, Beata, Heard, Jean Michel, Bellettato, Cinzia, Van Lingen, Corine, Scarpa, Maurizio, Debray, François Guillaume, Nassogne, Marie Cécile, Van Coster, Rudy, De Meirleir, Linda, Eyskens, François, Morava, Eva, Baric, Ivo, Kozich, Viktor, Lund, Allan Meldgaard, Germain, Dominique, Belmatoug, Nadia, Guffon, Nathalie, Labrune, Philippe, Gouya, Laurent, De Lonlay, Pascale, Schiff, Manuel, Dobbelaere, Dries, Chabrol, Brigitte, Das, Anihb Martin, Spiekerkoetter, Ute, Rutsch, Frank, Ploeckinger, Ursula, Mohnike, Klaus, Hahn, Andreas, Kölker, Stefan, Ullrich, Kurt, Balogh, István, Bembi, Bruno, Donati, Maria Alice, Gasperini, Serena, Parenti, Giancarlo, Salviati, Alessandro, Vici, Carlo Dionisi, Di Rocco, Maja, Cefalo, Graziella, Burlina, Alberto, Ceccarini, Giovanni, Federico, Antonio, Van Der Ploeg, Ans, Rubio-Gozalbo, Maria Estela, Van Spronsen, Francian, Visser, Gepke, Bosch, Annet, Tangeraas, Trine, Sanderberg, Sverre, and Kieć-Wilk, Beata

Published
2019

14. Parenteral hydroxocobalamin dose intensification in five patients with different types of early onset intracellular cobalamin defects: Clinical and biochemical responses

Author

Genetica Sectie Genoomdiagnostiek, Child Health, Scalais, Emmanuel, Osterheld, Elise, Geron, Christine, Pierron, Charlotte, Chafai, Ronit, Schlesser, Vincent, Borde, Patricia, Regal, Luc, Laeremans, Hilde, van Gassen, Koen L I, van den Heuvel, L Bert, De Meirleir, Linda, Genetica Sectie Genoomdiagnostiek, Child Health, Scalais, Emmanuel, Osterheld, Elise, Geron, Christine, Pierron, Charlotte, Chafai, Ronit, Schlesser, Vincent, Borde, Patricia, Regal, Luc, Laeremans, Hilde, van Gassen, Koen L I, van den Heuvel, L Bert, and De Meirleir, Linda

Published
2019

15. Research activity and capability in the European reference network MetabERN

Author

Metabole ziekten patientenzorg, Heard, Jean Michel, Bellettato, Cinzia, Van Lingen, Corine, Scarpa, Maurizio, Debray, François Guillaume, Nassogne, Marie Cécile, Van Coster, Rudy, De Meirleir, Linda, Eyskens, François, Morava, Eva, Baric, Ivo, Kozich, Viktor, Lund, Allan Meldgaard, Germain, Dominique, Belmatoug, Nadia, Guffon, Nathalie, Labrune, Philippe, Gouya, Laurent, De Lonlay, Pascale, Schiff, Manuel, Dobbelaere, Dries, Chabrol, Brigitte, Das, Anihb Martin, Spiekerkoetter, Ute, Rutsch, Frank, Ploeckinger, Ursula, Mohnike, Klaus, Hahn, Andreas, Kölker, Stefan, Ullrich, Kurt, Balogh, István, Bembi, Bruno, Donati, Maria Alice, Gasperini, Serena, Parenti, Giancarlo, Salviati, Alessandro, Vici, Carlo Dionisi, Di Rocco, Maja, Cefalo, Graziella, Burlina, Alberto, Ceccarini, Giovanni, Federico, Antonio, Van Der Ploeg, Ans, Rubio-Gozalbo, Maria Estela, Van Spronsen, Francian, Visser, Gepke, Bosch, Annet, Tangeraas, Trine, Sanderberg, Sverre, Kieć-Wilk, Beata, Metabole ziekten patientenzorg, Heard, Jean Michel, Bellettato, Cinzia, Van Lingen, Corine, Scarpa, Maurizio, Debray, François Guillaume, Nassogne, Marie Cécile, Van Coster, Rudy, De Meirleir, Linda, Eyskens, François, Morava, Eva, Baric, Ivo, Kozich, Viktor, Lund, Allan Meldgaard, Germain, Dominique, Belmatoug, Nadia, Guffon, Nathalie, Labrune, Philippe, Gouya, Laurent, De Lonlay, Pascale, Schiff, Manuel, Dobbelaere, Dries, Chabrol, Brigitte, Das, Anihb Martin, Spiekerkoetter, Ute, Rutsch, Frank, Ploeckinger, Ursula, Mohnike, Klaus, Hahn, Andreas, Kölker, Stefan, Ullrich, Kurt, Balogh, István, Bembi, Bruno, Donati, Maria Alice, Gasperini, Serena, Parenti, Giancarlo, Salviati, Alessandro, Vici, Carlo Dionisi, Di Rocco, Maja, Cefalo, Graziella, Burlina, Alberto, Ceccarini, Giovanni, Federico, Antonio, Van Der Ploeg, Ans, Rubio-Gozalbo, Maria Estela, Van Spronsen, Francian, Visser, Gepke, Bosch, Annet, Tangeraas, Trine, Sanderberg, Sverre, and Kieć-Wilk, Beata

Published
2019

16. Clinical implementation of gene panel testing for lysosomal storage diseases

Author

Gheldof, Alexander, Seneca, Sara, Stouffs, Katrien, Lissens, Willy, Jansen, Anna C M A.C., Laeremans, Hilde, Verloo, Patrick, Schoonjans, An Sofie, Meuwissen, Marije E C, Barca, Diana, Martens, Geert A, De Meirleir, Linda, Gheldof, Alexander, Seneca, Sara, Stouffs, Katrien, Lissens, Willy, Jansen, Anna C M A.C., Laeremans, Hilde, Verloo, Patrick, Schoonjans, An Sofie, Meuwissen, Marije E C, Barca, Diana, Martens, Geert A, and De Meirleir, Linda

Abstract

Background: The diagnostic workup in patients with a clinical suspicion of lysosomal storage diseases (LSD) is often difficult due to the variability in the clinical phenotype. The gold standard for diagnosis of LSDs consists of enzymatic testing. However, due to the sequential nature of this methodology and inconsistent genotype–phenotype correlations of certain LSDs, finding a diagnosis can be challenging. Method: We developed and clinically implemented a gene panel covering 50 genes known to cause LSDs when mutated. Over a period of 18 months, we analyzed 150 patients who were referred for LSD testing and compared these results with the data of patients who were previously enrolled in a scheme of classical biochemical testing. Results: Our panel was able to determine the molecular cause of the disease in 22 cases (15%), representing an increase in diagnostic yield compared to biochemical tests developed for 21 LSDs (4.6%). We were furthermore able to redirect the diagnosis of a mucolipidosis patient who was initially suspected to be affected with galactosialidosis. Several patients were identified as being affected with neuronal ceroid lipofuscinosis, which cannot readily be detected by enzyme testing. Finally, several carriers of pathogenic mutations in LSD genes related to the disease phenotype were identified as well, thus potentially increasing the diagnostic yield of the panel as heterozygous deletions cannot be detected. Conclusion: We show that the implementation of a gene panel for LSD diagnostics results in an increased yield in comparison to classical biochemical testing. As the panel is able to cover a wider range of diseases, we propose to implement this methodology as a first-tier test in cases of an aspecific LSD presentation, while enzymatic testing remains the first choice in patients with a more distinctive clinical presentation. Positive panel results should however still be enzymatically confirmed whenever possible., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2019

18. Delineating the GRIN1 phenotypic spectrum

Author

Lemke, Johannes R., Geider, Kirsten, Helbig, Katherine L., Heyne, Henrike O., Schütz, Hannah, Hentschel, Julia, Courage, Carolina, Depienne, Christel, Nava, Caroline, Heron, Delphine, Møller, Rikke S., Hjalgrim, Helle, Lal, Dennis, Neubauer, Bernd A., Nürnberg, Peter, Thiele, Holger, Kurlemann, Gerhard, Arnold, Georgianne L., Bhambhani, Vikas, Bartholdi, Deborah, Pedurupillay, Christeen Ramane J., Misceo, Doriana, Frengen, Eirik, Strømme, Petter, Dlugos, Dennis J., Doherty, Emily S., Bijlsma, Emilia K., Ruivenkamp, Claudia A., Hoffer, Mariette J.V., Goldstein, Amy, Rajan, Deepa S., Narayanan, Vinodh, Ramsey, Keri, Belnap, Newell, Schrauwen, Isabelle, Richholt, Ryan, Koeleman, Bobby P.C., Sá, Joaquim, Mendonça, Carla, de Kovel, Carolien G.F., Weckhuysen, Sarah, Hardies, Katia, De Jonghe, Peter, De Meirleir, Linda, Milh, Mathieu, Badens, Catherine, Lebrun, Marine, Busa, Tiffany, Francannet, Christine, Piton, Amélie, Riesch, Erik, Biskup, Saskia, Vogt, Heinrich, Dorn, Thomas, Helbig, Ingo, Michaud, Jacques L., Laube, Bodo, and Syrbe, Steffen

Subjects
Heterozygote, Movement Disorders, Homozygote, Nerve Tissue Proteins, Receptors, N-Methyl-D-Aspartate, Article, Cohort Studies, Consanguinity, Xenopus laevis, Phenotype, Seizures, Intellectual Disability, Mutation, Oocytes, Animals, Humans
Abstract

Objective: To determine the phenotypic spectrum caused by mutations in GRIN1 encoding the NMDA receptor subunit GluN1 and to investigate their underlying functional pathophysiology. Methods: We collected molecular and clinical data from several diagnostic and research cohorts. Functional consequences of GRIN1 mutations were investigated in Xenopus laevis oocytes. Results: We identified heterozygous de novo GRIN1 mutations in 14 individuals and reviewed the phenotypes of all 9 previously reported patients. These 23 individuals presented with a distinct phenotype of profound developmental delay, severe intellectual disability with absent speech, muscular hypotonia, hyperkinetic movement disorder, oculogyric crises, cortical blindness, generalized cerebral atrophy, and epilepsy. Mutations cluster within transmembrane segments and result in loss of channel function of varying severity with a dominant-negative effect. In addition, we describe 2 homozygous GRIN1 mutations (1 missense, 1 truncation), each segregating with severe neurodevelopmental phenotypes in consanguineous families. Conclusions: De novo GRIN1 mutations are associated with severe intellectual disability with cortical visual impairment as well as oculomotor and movement disorders being discriminating phenotypic features. Loss of NMDA receptor function appears to be the underlying disease mechanism. The identification of both heterozygous and homozygous mutations blurs the borders of dominant and recessive inheritance of GRIN1-associated disorders.

Published
2016

19. Parenteral hydroxocobalamin dose intensification in five patients with different types of early onset intracellular cobalamin defects: Clinical and biochemical responses

Author

Scalais, Emmanuel, primary, Osterheld, Elise, additional, Geron, Christine, additional, Pierron, Charlotte, additional, Chafai, Ronit, additional, Schlesser, Vincent, additional, Borde, Patricia, additional, Regal, Luc, additional, Laeremans, Hilde, additional, van Gassen, Koen L. I., additional, van den Heuvel, L. Bert, additional, and De Meirleir, Linda, additional

Published
2019
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20. Mucopolysaccharidosis type II: European recommendations for the diagnosis and multidisciplinary management of a rare disease

Author

Scarpa Maurizio, Almássy Zsuzsanna, Beck Michael, Bodamer Olaf, Bruce Iain A, De Meirleir Linda, Guffon Nathalie, Guillén-Navarro Encarna, Hensman Pauline, Jones Simon, Kamin Wolfgang, Kampmann Christoph, Lampe Christina, Lavery Christine A, Leão Teles Elisa, Link Bianca, Lund Allan M, Malm Gunilla, Pitz Susanne, Rothera Michael, Stewart Catherine, Tylki-Szymańska Anna, van der Ploeg Ans, Walker Robert, Zeman Jiri, and Wraith James E

Subjects
Medicine
Abstract

Abstract Mucopolysaccharidosis type II (MPS II) is a rare, life-limiting, X-linked recessive disease characterised by deficiency of the lysosomal enzyme iduronate-2-sulfatase. Consequent accumulation of glycosaminoglycans leads to pathological changes in multiple body systems. Age at onset, signs and symptoms, and disease progression are heterogeneous, and patients may present with many different manifestations to a wide range of specialists. Expertise in diagnosing and managing MPS II varies widely between countries, and substantial delays between disease onset and diagnosis can occur. In recent years, disease-specific treatments such as enzyme replacement therapy and stem cell transplantation have helped to address the underlying enzyme deficiency in patients with MPS II. However, the multisystem nature of this disorder and the irreversibility of some manifestations mean that most patients require substantial medical support from many different specialists, even if they are receiving treatment. This article presents an overview of how to recognise, diagnose, and care for patients with MPS II. Particular focus is given to the multidisciplinary nature of patient management, which requires input from paediatricians, specialist nurses, otorhinolaryngologists, orthopaedic surgeons, ophthalmologists, cardiologists, pneumologists, anaesthesiologists, neurologists, physiotherapists, occupational therapists, speech therapists, psychologists, social workers, homecare companies and patient societies. Take-home message Expertise in recognising and treating patients with MPS II varies widely between countries. This article presents pan-European recommendations for the diagnosis and management of this life-limiting disease.

Published
2011
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21. Clinical implementation of gene panel testing for lysosomal storage diseases

Author

Gheldof, Alexander, primary, Seneca, Sara, additional, Stouffs, Katrien, additional, Lissens, Willy, additional, Jansen, Anna, additional, Laeremans, Hilde, additional, Verloo, Patrick, additional, Schoonjans, An‐Sofie, additional, Meuwissen, Marije, additional, Barca, Diana, additional, Martens, Geert, additional, and De Meirleir, Linda, additional

Published
2018
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24. The phenotypic spectrum of organic acidurias and urea cycle disorders. Part 2: the evolving clinical phenotype

Author

Kölker, Stefan, Valayannopoulos, Vassili, Burlina, Alberto B, Sykut-Cegielska, Jolanta, Wijburg, Frits A, Teles, Elisa Leão, Zeman, Jiří, Dionisi-Vici, Carlo, Barić, Ivo, Karall, Daniela, Arnoux, Jean-Baptiste, Avram, Paula, Baumgartner, Matthias R, Blasco-Alonso, Javier, Boy, S P Nikolas, Rasmussen, Marlene Bøgehus, Burgard, Peter, Chabrol, Brigitte, Chakrapani, Anupam, Chapman, Kimberly, Cortès I Saladelafont, Elisenda, Couce, Maria L, De Meirleir, Linda, Dobbelaere, Dries, Furlan, Francesca, Gleich, Florian, González, Maria Julieta, Gradowska, Wanda, Grünewald, Stephanie, Honzík, Tomáš, Hörster, Friederike, Ioannou, Hariklea, Jalan, Anil, Häberle, Johannes, Haege, Gisela, Langereis, Eveline, De Lonlay, Pascale, Martinelli, Diego, Matsumoto, Shirou, Mühlhausen, Chris, Murphy, Elaine, de Baulny, Hélène Ogier, Ortez, Carlos, Pedrón, Consuelo C, Pintos-Morell, Guillem, Pena-Quintana, Luis, Ramadža, Danijela Petković, Rodrigues, Esmeralda, Scholl-Bürgi, Sabine, Sokal, Etienne, Summar, Marshall L, Thompson, Nicholas, Vara, Roshni, Pinera, Inmaculada Vives, Walter, John H, Williams, Monique, Lund, Allan M, Garcia-Cazorla, Angeles, Garcia Cazorla, Angeles, Reproduction and Genetics, Neurogenetics, Clinical sciences, AGEM - Amsterdam Gastroenterology Endocrinology Metabolism, Paediatric Metabolic Diseases, Other departments, and Pediatrics

Subjects
Adult, Male, congenital, hereditary, and neonatal diseases and abnormalities, Propionic Acidemia, Urea cycle disorder, Adolescent, Argininosuccinic Aciduria, Kaplan-Meier Estimate, Biology, Bioinformatics, Disease course, Young Adult, Neonatal Screening, Genetics, medicine, Humans, Glutaryl-CoA dehydrogenase deficiency, Registries, Clinical phenotype, Child, Amino Acid Metabolism, Inborn Errors, Urea Cycle Disorders, Inborn, Genetics (clinical), Aged, Glutaryl-CoA Dehydrogenase, Brain Diseases, Metabolic, Infant, Newborn, nutritional and metabolic diseases, Infant, Optic nerve atrophy, Middle Aged, medicine.disease, Phenotype, 3. Good health, Ornithine Carbamoyltransferase Deficiency Disease, Europe, Biochemistry, Liver, Urea cycle, Child, Preschool, Chronic renal failure, Kidney Failure, Chronic, Female
Abstract

BACKGROUND: The disease course and long-term outcome of patients with organic acidurias (OAD) and urea cycle disorders (UCD) are incompletely understood. AIMS: To evaluate the complex clinical phenotype of OAD and UCD patients at different ages. RESULTS: Acquired microcephaly and movement disorders were common in OAD and UCD highlighting that the brain is the major organ involved in these diseases. Cardiomyopathy [methylmalonic (MMA) and propionic aciduria (PA)], prolonged QTc interval (PA), optic nerve atrophy [MMA, isovaleric aciduria (IVA)], pancytopenia (PA), and macrocephaly [glutaric aciduria type 1 (GA1)] were exclusively found in OAD patients, whereas hepatic involvement was more frequent in UCD patients, in particular in argininosuccinate lyase (ASL) deficiency. Chronic renal failure was often found in MMA, with highest frequency in mut(0) patients. Unexpectedly, chronic renal failure was also observed in adolescent and adult patients with GA1 and ASL deficiency. It had a similar frequency in patients with or without a movement disorder suggesting different pathophysiology. Thirteen patients (classic OAD: 3, UCD: 10) died during the study interval, ten of them during the initial metabolic crisis in the newborn period. Male patients with late-onset ornithine transcarbamylase deficiency were presumably overrepresented in the study population. CONCLUSIONS: Neurologic impairment is common in OAD and UCD, whereas the involvement of other organs (heart, liver, kidneys, eyes) follows a disease-specific pattern. The identification of unexpected chronic renal failure in GA1 and ASL deficiency emphasizes the importance of a systematic follow-up in patients with rare diseases.

Published
2015
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25. Biallelic mutations in RTTN are associated with microcephaly, short stature and a wide range of brain malformations.

Author

UCL - SSS/IREC/MONT - Pôle Mont Godinne, UCL - (MGD) Neuropédiatrie, Stouffs, Katrien, Moortgat, Stéphanie, Vanderhasselt, Tim, Vandervore, Laura, Dica, Alice, Mathot, Mikaël, Keymolen, Kathelijn, Seneca, Sara, Gheldof, Alexander, De Meirleir, Linda, Jansen, Anna C, UCL - SSS/IREC/MONT - Pôle Mont Godinne, UCL - (MGD) Neuropédiatrie, Stouffs, Katrien, Moortgat, Stéphanie, Vanderhasselt, Tim, Vandervore, Laura, Dica, Alice, Mathot, Mikaël, Keymolen, Kathelijn, Seneca, Sara, Gheldof, Alexander, De Meirleir, Linda, and Jansen, Anna C

Abstract

Biallelic mutations in the RTTN gene have been reported in association with microcephaly, short stature, developmental delay and malformations of cortical development. RTTN mutations have previously shown to link aberrant ciliary function with abnormal development and organization of the human cerebral cortex. We here report three individuals from two unrelated families with novel mutations in the RTTN gene. The phenotype consisted of microcephaly, short stature, pachygyria or polymicrogyria, colpocephaly, hypoplasia of the corpus callosum and superior vermis. These findings provide further confirmation of the phenotype related to pathogenic variants in RTTN.

Published
2018

26. Clinical, biochemical and genetic spectrum of 70 patients with ACAD9 deficiency: is riboflavin supplementation effective?

Author

UCL - SSS/IONS - Institute of NeuroScience, UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - (SLuc) Service de neurologie pédiatrique, Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cécile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, Wortmann, Saskia, UCL - SSS/IONS - Institute of NeuroScience, UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - (SLuc) Service de neurologie pédiatrique, Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cécile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, and Wortmann, Saskia

Abstract

BACKGROUND: Mitochondrial acyl-CoA dehydrogenase family member 9 (ACAD9) is essential for the assembly of mitochondrial respiratory chain complex I. Disease causing biallelic variants in ACAD9 have been reported in individuals presenting with lactic acidosis and cardiomyopathy. RESULTS: We describe the genetic, clinical and biochemical findings in a cohort of 70 patients, of whom 29 previously unpublished. We found 34 known and 18 previously unreported variants in ACAD9. No patients harbored biallelic loss of function mutations, indicating that this combination is unlikely to be compatible with life. Causal pathogenic variants were distributed throughout the entire gene, and there was no obvious genotype-phenotype correlation. Most of the patients presented in the first year of life. For this subgroup the survival was poor (50% not surviving the first 2 years) comparing to patients with a later presentation (more than 90% surviving 10 years). The most common clinical findings were cardiomyopathy (85%), muscular weakness (75%) and exercise intolerance (72%). Interestingly, severe intellectual deficits were only reported in one patient and severe developmental delays in four patients. More than 70% of the patients were able to perform the same activities of daily living when compared to peers. CONCLUSIONS: Our data show that riboflavin treatment improves complex I activity in the majority of patient-derived fibroblasts tested. This effect was also reported for most of the treated patients and is mirrored in the survival data. In the patient group with disease-onset below 1 year of age, we observed a statistically-significant better survival for patients treated with riboflavin.

Published
2018

27. Clinical, biochemical and genetic spectrum of 70 patients with ACAD9 deficiency: Is riboflavin supplementation effective?

Author

Repp, B, Mastantuono, E, Alston, C, Schiff, M, Haack, T, Rötig, A, Ardissone, A, Lombès, A, Catarino, C, Diodato, D, Schottmann, G, Poulton, J, Burlina, A, Jonckheere, A, Munnich, A, Rolinski, B, Ghezzi, D, Rokicki, D, Wellesley, D, Martinelli, D, Wenhong, D, Lamantea, E, Ostergaard, E, Pronicka, E, Pierre, G, Smeets, H, Wittig, I, Scurr, I, De Coo, I, Moroni, I, Smet, J, Mayr, J, Dai, L, De Meirleir, L, Schuelke, M, Zeviani, M, Morscher, R, Mcfarland, R, Seneca, S, Klopstock, T, Meitinger, T, Wieland, T, Strom, T, Herberg, U, Ahting, U, Sperl, W, Nassogne, M, Ling, H, Fang, F, Freisinger, P, Van Coster, R, Strecker, V, Taylor, R, Häberle, J, Vockley, J, Prokisch, H, Wortmann, S, Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, De Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, De Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, Wortmann, Saskia, Repp, B, Mastantuono, E, Alston, C, Schiff, M, Haack, T, Rötig, A, Ardissone, A, Lombès, A, Catarino, C, Diodato, D, Schottmann, G, Poulton, J, Burlina, A, Jonckheere, A, Munnich, A, Rolinski, B, Ghezzi, D, Rokicki, D, Wellesley, D, Martinelli, D, Wenhong, D, Lamantea, E, Ostergaard, E, Pronicka, E, Pierre, G, Smeets, H, Wittig, I, Scurr, I, De Coo, I, Moroni, I, Smet, J, Mayr, J, Dai, L, De Meirleir, L, Schuelke, M, Zeviani, M, Morscher, R, Mcfarland, R, Seneca, S, Klopstock, T, Meitinger, T, Wieland, T, Strom, T, Herberg, U, Ahting, U, Sperl, W, Nassogne, M, Ling, H, Fang, F, Freisinger, P, Van Coster, R, Strecker, V, Taylor, R, Häberle, J, Vockley, J, Prokisch, H, Wortmann, S, Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, De Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, De Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, and Wortmann, Saskia

Abstract

Background: Mitochondrial acyl-CoA dehydrogenase family member 9 (ACAD9) is essential for the assembly of mitochondrial respiratory chain complex I. Disease causing biallelic variants in ACAD9 have been reported in individuals presenting with lactic acidosis and cardiomyopathy. Results: We describe the genetic, clinical and biochemical findings in a cohort of 70 patients, of whom 29 previously unpublished. We found 34 known and 18 previously unreported variants in ACAD9. No patients harbored biallelic loss of function mutations, indicating that this combination is unlikely to be compatible with life. Causal pathogenic variants were distributed throughout the entire gene, and there was no obvious genotype-phenotype correlation. Most of the patients presented in the first year of life. For this subgroup the survival was poor (50% not surviving the first 2 years) comparing to patients with a later presentation (more than 90% surviving 10 years). The most common clinical findings were cardiomyopathy (85%), muscular weakness (75%) and exercise intolerance (72%). Interestingly, severe intellectual deficits were only reported in one patient and severe developmental delays in four patients. More than 70% of the patients were able to perform the same activities of daily living when compared to peers. Conclusions: Our data show that riboflavin treatment improves complex I activity in the majority of patient-derived fibroblasts tested. This effect was also reported for most of the treated patients and is mirrored in the survival data. In the patient group with disease-onset below 1 year of age, we observed a statistically-significant better survival for patients treated with riboflavin.

Published
2018

28. Phenotype-genotype correlations in Leigh syndrome:new insights from a multicentre study of 96 patients

Author

Sofou, Kalliopi, de Coo, Irenaeus F M, Østergaard, Elsebet, Isohanni, Pirjo, Naess, Karin, De Meirleir, Linda, Tzoulis, Charalampos, Uusimaa, Johanna, Lönnqvist, Tuula, Bindoff, Laurence Albert, Tulinius, Már, Darin, Niklas, Sofou, Kalliopi, de Coo, Irenaeus F M, Østergaard, Elsebet, Isohanni, Pirjo, Naess, Karin, De Meirleir, Linda, Tzoulis, Charalampos, Uusimaa, Johanna, Lönnqvist, Tuula, Bindoff, Laurence Albert, Tulinius, Már, and Darin, Niklas

Abstract

BACKGROUND: Leigh syndrome is a phenotypically and genetically heterogeneous mitochondrial disorder. While some genetic defects are associated with well-described phenotypes, phenotype-genotype correlations in Leigh syndrome are not fully explored.OBJECTIVE: We aimed to identify phenotype-genotype correlations in Leigh syndrome in a large cohort of systematically evaluated patients.METHODS: We studied 96 patients with genetically confirmed Leigh syndrome diagnosed and followed in eight European centres specialising in mitochondrial diseases.RESULTS: We found that ataxia, ophthalmoplegia and cardiomyopathy were more prevalent among patients with mitochondrial DNA defects. Patients with mutations in MT-ND and NDUF genes with complex I deficiency shared common phenotypic features, such as early development of central nervous system disease, followed by high occurrence of cardiac and ocular manifestations. The cerebral cortex was affected in patients with NDUF mutations significantly more often than the rest of the cohort. Patients with the m.8993T>G mutation in MT-ATP6 gene had more severe clinical and radiological manifestations and poorer disease outcome compared with patients with the m.8993T>C mutation.CONCLUSION: Our study provides new insights into phenotype-genotype correlations in Leigh syndrome and particularly in patients with complex I deficiency and with defects in the mitochondrial ATP synthase.

Published
2018

29. Clinical, biochemical and genetic spectrum of 70 patients with ACAD9 deficiency:is riboflavin supplementation effective?

Author

Repp, Birgit M, Mastantuono, Elisa, Alston, Charlotte L, Schiff, Manuel, Haack, Tobias B, Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B, Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J M, Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F M, Moroni, Isabella, Smet, Joél, Mayr, Johannes A, Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J, McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M, Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W, Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, Wortmann, Saskia, Repp, Birgit M, Mastantuono, Elisa, Alston, Charlotte L, Schiff, Manuel, Haack, Tobias B, Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B, Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J M, Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F M, Moroni, Isabella, Smet, Joél, Mayr, Johannes A, Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J, McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M, Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W, Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, and Wortmann, Saskia

Abstract

BACKGROUND: Mitochondrial acyl-CoA dehydrogenase family member 9 (ACAD9) is essential for the assembly of mitochondrial respiratory chain complex I. Disease causing biallelic variants in ACAD9 have been reported in individuals presenting with lactic acidosis and cardiomyopathy.RESULTS: We describe the genetic, clinical and biochemical findings in a cohort of 70 patients, of whom 29 previously unpublished. We found 34 known and 18 previously unreported variants in ACAD9. No patients harbored biallelic loss of function mutations, indicating that this combination is unlikely to be compatible with life. Causal pathogenic variants were distributed throughout the entire gene, and there was no obvious genotype-phenotype correlation. Most of the patients presented in the first year of life. For this subgroup the survival was poor (50% not surviving the first 2 years) comparing to patients with a later presentation (more than 90% surviving 10 years). The most common clinical findings were cardiomyopathy (85%), muscular weakness (75%) and exercise intolerance (72%). Interestingly, severe intellectual deficits were only reported in one patient and severe developmental delays in four patients. More than 70% of the patients were able to perform the same activities of daily living when compared to peers.CONCLUSIONS: Our data show that riboflavin treatment improves complex I activity in the majority of patient-derived fibroblasts tested. This effect was also reported for most of the treated patients and is mirrored in the survival data. In the patient group with disease-onset below 1 year of age, we observed a statistically-significant better survival for patients treated with riboflavin.

Published
2018

30. Quantifying activity changes of neuromuscular patients using the ACTIVLIM questionnaire: a 5-years longitudinal study

Author

Bleyenheuft, Corinne, Goemans, Nathalie, Wanyama, S, Van Damme, Philip, De Bleecker, Jan, Van Coster, Rudy, De Jonghe, Peter, Beysens, D., Van den Bergh, Peter, Paquay, Stéphanie, Servais, Laurent, Maertens de Noordhout, Alain, Haan, J, De Meirleir, Linda, Remiche, Gauthier, Deconinck, Nicolas, Arnould, Carlyne, Bleyenheuft, Corinne, Goemans, Nathalie, Wanyama, S, Van Damme, Philip, De Bleecker, Jan, Van Coster, Rudy, De Jonghe, Peter, Beysens, D., Van den Bergh, Peter, Paquay, Stéphanie, Servais, Laurent, Maertens de Noordhout, Alain, Haan, J, De Meirleir, Linda, Remiche, Gauthier, Deconinck, Nicolas, and Arnould, Carlyne

Abstract

info:eu-repo/semantics/published

Published
2018

31. Quantifying the changes in activity level of neuromuscular patients using the ACTIVLIM questionnaire: A 5-years study

Author

Bleyenheuft, Corinne, Wanyama, S, Van Damme, Philip, Goemans, Nathalie, De Bleecker, Jan, Van Coster, Rudy, de Jonghe, Peter, Beysens, D., Van Den Bergh, Peter, Paquay, Stéphanie, Servais, Laurent, Maertens de Noordhout, Alain, Haan, J, De Meirleir, Linda, Remiche, Gauthier, Deconinck, Nicolas, Arnould, Carlyne, BNMDR, Study group, Bleyenheuft, Corinne, Wanyama, S, Van Damme, Philip, Goemans, Nathalie, De Bleecker, Jan, Van Coster, Rudy, de Jonghe, Peter, Beysens, D., Van Den Bergh, Peter, Paquay, Stéphanie, Servais, Laurent, Maertens de Noordhout, Alain, Haan, J, De Meirleir, Linda, Remiche, Gauthier, Deconinck, Nicolas, Arnould, Carlyne, and BNMDR, Study group

Abstract

info:eu-repo/semantics/published

Published
2018

32. Clinical, biochemical and genetic spectrum of 70 patients with ACAD9 deficiency: is riboflavin supplementation effective?

Author

Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rotig, Agnes, Ardissone, Anna, Lombes, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Ding, Wenhong, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joel, Mayr, Johannes A., Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Haberle, Johannes, Vockley, Jerry, Prokisch, Holger, Wortmann, Saskia, UCL - SSS/IONS - Institute of NeuroScience, UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - (SLuc) Service de neurologie pédiatrique, Repp, B, Mastantuono, E, Alston, C, Schiff, M, Haack, T, Rötig, A, Ardissone, A, Lombès, A, Catarino, C, Diodato, D, Schottmann, G, Poulton, J, Burlina, A, Jonckheere, A, Munnich, A, Rolinski, B, Ghezzi, D, Rokicki, D, Wellesley, D, Martinelli, D, Wenhong, D, Lamantea, E, Ostergaard, E, Pronicka, E, Pierre, G, Smeets, H, Wittig, I, Scurr, I, De Coo, I, Moroni, I, Smet, J, Mayr, J, Dai, L, De Meirleir, L, Schuelke, M, Zeviani, M, Morscher, R, Mcfarland, R, Seneca, S, Klopstock, T, Meitinger, T, Wieland, T, Strom, T, Herberg, U, Ahting, U, Sperl, W, Nassogne, M, Ling, H, Fang, F, Freisinger, P, Van Coster, R, Strecker, V, Taylor, R, Häberle, J, Vockley, J, Prokisch, H, Wortmann, S, Apollo - University of Cambridge Repository, Reproduction and Genetics, Neurogenetics, Clinical sciences, Pediatrics, Medical Genetics, Neurology, RS: GROW - R4 - Reproductive and Perinatal Medicine, Klinische Genetica, and RS: FHML MaCSBio

Subjects
Electron Transport Complex I/metabolism, Male, Mitochondrial Diseases, genetics [Mitochondrial Diseases], PHENOTYPIC SPECTRUM, Riboflavin, therapeutic use [Riboflavin], lcsh:Medicine, Acidosis/genetics, Heart transplantation, OXIDATION, Acyl-CoA Dehydrogenase, drug therapy [Muscle Weakness], Neonatal, Activities Of Daily Living, Cardiomyopathy, Complex I, Heart Transplantation, Lactic Acidosis, Mitochondrial Disorder, Prognosis, Treatment, Vitamin, Activities of Daily Living, Medicine and Health Sciences, Genetics(clinical), Pharmacology (medical), Amino Acid Metabolism, Inborn Errors/genetics, Genetics (clinical), Cardiomyopathy, Hypertrophic/genetics, Muscle Weakness, genetics [Cardiomyopathy, Hypertrophic], Lactic acidosis, Inborn Errors, Activities of daily living, Riboflavin/therapeutic use, Mitochondrial disorder, metabolism [Acidosis], Lactic acidosi, metabolism [Mitochondrial Diseases], Acidosis, Amino Acid Metabolism, Inborn Errors, Cardiomyopathy, Hypertrophic, Electron Transport Complex I, Female, Humans, genetics [Muscle Weakness], SKELETAL-MUSCLE, pathology [Cardiomyopathy, Hypertrophic], pathology [Amino Acid Metabolism, Inborn Errors], DISORDERS, Prognosi, metabolism [Cardiomyopathy, Hypertrophic], pathology [Acidosis], Mitochondrial Diseases/genetics, DIAGNOSIS, metabolism [Acyl-CoA Dehydrogenase], Muscle Weakness/drug therapy, genetics [Amino Acid Metabolism, Inborn Errors], ddc:610, metabolism [Electron Transport Complex I], pathology [Muscle Weakness], MUTATIONS, deficiency [Acyl-CoA Dehydrogenase], Research, lcsh:R, Biology and Life Sciences, metabolism [Muscle Weakness], BEZAFIBRATE, Acyl-CoA Dehydrogenase/deficiency, metabolism [Amino Acid Metabolism, Inborn Errors], PAGE, Amino Acid Metabolism, pathology [Mitochondrial Diseases], Hypertrophic, CELLS, COMPLEX-I DEFICIENCY, genetics [Acidosis], Human medicine, genetics [Acyl-CoA Dehydrogenase]
Abstract

Background Mitochondrial acyl-CoA dehydrogenase family member 9 (ACAD9) is essential for the assembly of mitochondrial respiratory chain complex I. Disease causing biallelic variants in ACAD9 have been reported in individuals presenting with lactic acidosis and cardiomyopathy. Results We describe the genetic, clinical and biochemical findings in a cohort of 70 patients, of whom 29 previously unpublished. We found 34 known and 18 previously unreported variants in ACAD9. No patients harbored biallelic loss of function mutations, indicating that this combination is unlikely to be compatible with life. Causal pathogenic variants were distributed throughout the entire gene, and there was no obvious genotype-phenotype correlation. Most of the patients presented in the first year of life. For this subgroup the survival was poor (50% not surviving the first 2 years) comparing to patients with a later presentation (more than 90% surviving 10 years). The most common clinical findings were cardiomyopathy (85%), muscular weakness (75%) and exercise intolerance (72%). Interestingly, severe intellectual deficits were only reported in one patient and severe developmental delays in four patients. More than 70% of the patients were able to perform the same activities of daily living when compared to peers. Conclusions Our data show that riboflavin treatment improves complex I activity in the majority of patient-derived fibroblasts tested. This effect was also reported for most of the treated patients and is mirrored in the survival data. In the patient group with disease-onset below 1 year of age, we observed a statistically-significant better survival for patients treated with riboflavin. Electronic supplementary material The online version of this article (10.1186/s13023-018-0784-8) contains supplementary material, which is available to authorized users.

Published
2017

35. Health Related Quality of Life, Disability, and Pain in Alpha Mannosidosis

Author

Borgwardt, Line, primary, Guffon, Nathalie, additional, Amraoui, Yasmina, additional, Jones, Simon A., additional, De Meirleir, Linda, additional, Lund, Allan M., additional, Gil-Campos, Mercedes, additional, Van den Hout, Johanna M. P., additional, Tylki-Szymanska, Anna, additional, Geraci, Silvia, additional, Ardigò, Diego, additional, Cattaneo, Federica, additional, Harmatz, Paul, additional, and Phillips, Dawn, additional

Published
2018
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36. Biallelic mutations in the 3' exonuclease TOE1 cause pontocerebellar hypoplasia and uncover a role in snRNA processing.

Author

UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - (SLuc) Service de neurologie pédiatrique, Lardelli, Rea M, Schaffer, Ashleigh E, Eggens, Veerle R C, Zaki, Maha S, Grainger, Stephanie, Sathe, Shashank, Van Nostrand, Eric L, Schlachetzki, Zinayida, Rosti, Basak, Akizu, Naiara, Scott, Eric, Silhavy, Jennifer L, Heckman, Laura Dean, Rosti, Rasim Ozgur, Dikoglu, Esra, Gregor, Anne, Guemez-Gamboa, Alicia, Musaev, Damir, Mande, Rohit, Widjaja, Ari, Shaw, Tim L, Markmiller, Sebastian, Marin-Valencia, Isaac, Davies, Justin H, de Meirleir, Linda, Kayserili, Hulya, Altunoglu, Umut, Freckmann, Mary Louise, Warwick, Linda, Chitayat, David, Blaser, Susan, Çağlayan, Ahmet Okay, Bilguvar, Kaya, Per, Huseyin, Fagerberg, Christina, Christesen, Henrik T, Kibaek, Maria, Aldinger, Kimberly A, Manchester, David, Matsumoto, Naomichi, Muramatsu, Kazuhiro, Saitsu, Hirotomo, Shiina, Masaaki, Ogata, Kazuhiro, Foulds, Nicola, Dobyns, William B, Chi, Neil C, Traver, David, Spaccini, Luigina, Bova, Stefania Maria, Gabriel, Stacey B, Gunel, Murat, Valente, Enza Maria, Nassogne, Marie-Cécile, Bennett, Eric J, Yeo, Gene W, Baas, Frank, Lykke-Andersen, Jens, Gleeson, Joseph G, UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - (SLuc) Service de neurologie pédiatrique, Lardelli, Rea M, Schaffer, Ashleigh E, Eggens, Veerle R C, Zaki, Maha S, Grainger, Stephanie, Sathe, Shashank, Van Nostrand, Eric L, Schlachetzki, Zinayida, Rosti, Basak, Akizu, Naiara, Scott, Eric, Silhavy, Jennifer L, Heckman, Laura Dean, Rosti, Rasim Ozgur, Dikoglu, Esra, Gregor, Anne, Guemez-Gamboa, Alicia, Musaev, Damir, Mande, Rohit, Widjaja, Ari, Shaw, Tim L, Markmiller, Sebastian, Marin-Valencia, Isaac, Davies, Justin H, de Meirleir, Linda, Kayserili, Hulya, Altunoglu, Umut, Freckmann, Mary Louise, Warwick, Linda, Chitayat, David, Blaser, Susan, Çağlayan, Ahmet Okay, Bilguvar, Kaya, Per, Huseyin, Fagerberg, Christina, Christesen, Henrik T, Kibaek, Maria, Aldinger, Kimberly A, Manchester, David, Matsumoto, Naomichi, Muramatsu, Kazuhiro, Saitsu, Hirotomo, Shiina, Masaaki, Ogata, Kazuhiro, Foulds, Nicola, Dobyns, William B, Chi, Neil C, Traver, David, Spaccini, Luigina, Bova, Stefania Maria, Gabriel, Stacey B, Gunel, Murat, Valente, Enza Maria, Nassogne, Marie-Cécile, Bennett, Eric J, Yeo, Gene W, Baas, Frank, Lykke-Andersen, Jens, and Gleeson, Joseph G

Abstract

Deadenylases are best known for degrading the poly(A) tail during mRNA decay. The deadenylase family has expanded throughout evolution and, in mammals, consists of 12 Mg(2+)-dependent 3'-end RNases with substrate specificity that is mostly unknown. Pontocerebellar hypoplasia type 7 (PCH7) is a unique recessive syndrome characterized by neurodegeneration and ambiguous genitalia. We studied 12 human families with PCH7, uncovering biallelic, loss-of-function mutations in TOE1, which encodes an unconventional deadenylase. toe1-morphant zebrafish displayed midbrain and hindbrain degeneration, modeling PCH-like structural defects in vivo. Surprisingly, we found that TOE1 associated with small nuclear RNAs (snRNAs) incompletely processed spliceosomal. These pre-snRNAs contained 3' genome-encoded tails often followed by post-transcriptionally added adenosines. Human cells with reduced levels of TOE1 accumulated 3'-end-extended pre-snRNAs, and the immunoisolated TOE1 complex was sufficient for 3'-end maturation of snRNAs. Our findings identify the cause of a neurodegenerative syndrome linked to snRNA maturation and uncover a key factor involved in the processing of snRNA 3' ends.

Published
2017

37. Progressive deafness-dystonia due to SERAC1 mutations: A study of 67 cases

Author

Maas, Roeltje R., Iwanicka-Pronicka, Katarzyna, Kalkan Ucar, Sema, Alhaddad, Bader, Alsayed, Moeenaldeen, Al-Owain, Mohammed A., Al-Zaidan, Hamad I., Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K., Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Nikla, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M., Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A., Mcclean, Patricia, De Meirleir, Linda, Naess, Karin, Ngu, Lock H., Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthi, Taylor, Robert W., Trubicka, Joanna, Tsiakas, Konstantino, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P., Wortmann, Saskia B., Colombo, Roberto (ORCID:0000-0003-0482-7542), Maas, Roeltje R., Iwanicka-Pronicka, Katarzyna, Kalkan Ucar, Sema, Alhaddad, Bader, Alsayed, Moeenaldeen, Al-Owain, Mohammed A., Al-Zaidan, Hamad I., Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K., Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Nikla, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M., Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A., Mcclean, Patricia, De Meirleir, Linda, Naess, Karin, Ngu, Lock H., Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthi, Taylor, Robert W., Trubicka, Joanna, Tsiakas, Konstantino, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P., Wortmann, Saskia B., and Colombo, Roberto (ORCID:0000-0003-0482-7542)

Abstract

Objective: 3-Methylglutaconic aciduria, dystonia–deafness, hepatopathy, encephalopathy, Leigh-like syndrome (MEGDHEL) syndrome is caused by biallelic variants in SERAC1. Methods: This multicenter study addressed the course of disease for each organ system. Metabolic, neuroradiological, and genetic findings are reported. Results: Sixty-seven individuals (39 previously unreported) from 59 families were included (age range = 5 days–33.4 years, median age = 9 years). A total of 41 different SERAC1 variants were identified, including 20 that have not been reported before. With the exception of 2 families with a milder phenotype, all affected individuals showed a strikingly homogeneous phenotype and time course. Severe, reversible neonatal liver dysfunction and hypoglycemia were seen in >40% of all cases. Starting at a median age of 6 months, muscular hypotonia (91%) was seen, followed by progressive spasticity (82%, median onset = 15 months) and dystonia (82%, 18 months). The majority of affected individuals never learned to walk (68%). Seventy-nine percent suffered hearing loss, 58% never learned to speak, and nearly all had significant intellectual disability (88%). Magnetic resonance imaging features were accordingly homogenous, with bilateral basal ganglia involvement (98%); the characteristic “putaminal eye” was seen in 53%. The urinary marker 3-methylglutaconic aciduria was present in virtually all patients (98%). Supportive treatment focused on spasticity and drooling, and was effective in the individuals treated; hearing aids or cochlear implants did not improve communication skills. Interpretation: MEGDHEL syndrome is a progressive deafness–dystonia syndrome with frequent and reversible neonatal liver involvement and a strikingly homogenous course of disease. Ann Neurol 2017;82:1004–1015.

Published
2017

38. A BCOR VARIANT IN A MALE

Author

De Rademaeker, Marjan, De Meirleir, Linda, Houtman, Anne Cees, Stouffs, Katrien, Van Dooren, Sonia, Croes, Didier, Keymolen, Kathelijn, Reproduction and Genetics, Clinical sciences, Neurogenetics, Neuroprotection & Neuromodulation, and Faculty of Medicine and Pharmacy

Subjects
Health Professions(all), dysmorphology, eye diseases
Abstract

We report on a boy born at 32 weeks after a pregnancy complicated with preeclampsia and intrauterine growth retardation. He presented dysmorphism and urogenital anomalies (cryptorchidism and hypospadias). Neonatal period was complicated by a persistent ductus arteriosus with severe pulmonary hypertension, pyloric stenosis MCOPS1 and severe feeding problems. At the age of 5 years the boy presents dysmorphism (small eyes, bilateral epicanthus, synophris, long philtrum, thin upper lip, teeth abnormalities, clubbing finger nails and clinodactyly of the toes, radioulnar synostosis). He has intellectual disability. Cerebral MRI shows a thin corpus callosum, colpocephaly and some white matter disturbances. Feeding difficulties are still present and he is partially fed by a duodenal tube. He has a growth retardation. A new variant in BCL6 corepressor gene (BCOR gene) was demonstrated. It is inherited from the mother. The BCOR gene on chromosome Xp11.4 is causative for the X linked dominant oculo-facio-cardio-dental syndrome (OFCD, Microphthalmia syndromic 2, MOCPS2).The phenotype is characterised by an ocular phenotype(such as microphthalmia), facial anomalies cardiac defects, dental irregularities and skeletal anomalies such as radioulnar synostosis seldom intellectual disability is associated. Pathogenic variants are deletions, truncating mutations and frame shift mutations with lethality in males. Lenz microphtalmia syndrome is a X linked recessive condition. It comprises ocular anomalies (microphthalmia), facial dysmorphism, genitourinary and skeletal defects as well as developmental delay. The NAA10 gene on X q28 (MCOPS1) and BCOR are the two genes associated with the syndrome. Three male patients with a Lenz microphthalmia phenotype were previously reported having a missense mutation in BCOR. Here we might present a fourth male patient with Lenz microphthalmia and a new missense variant in the BCOR gene. This is compatible with the earlier suggested hypothesis that females carrying mutations that result in a premature termination codon have OFCD and males carrying a missense mutation have Lenz microphthalmia syndrome. Our patient presented a radioulnar synostosis, a feature associated in females with OFCD and seen in one boy with a mutation BCOR. When a male patient with ocular and urogenital anomalies and intellectual disability has radioulnar synostosis one should think of BCOR mutation analysis.

Published
2016

39. Phenotype-genotype correlations in Leigh syndrome: new insights from a multicentre study of 96 patients

Author

Sofou, Kalliopi, primary, de Coo, Irenaeus F M, additional, Ostergaard, Elsebet, additional, Isohanni, Pirjo, additional, Naess, Karin, additional, De Meirleir, Linda, additional, Tzoulis, Charalampos, additional, Uusimaa, Johanna, additional, Lönnqvist, Tuula, additional, Bindoff, Laurence Albert, additional, Tulinius, Már, additional, and Darin, Niklas, additional

Published
2017
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40. The phenotypic spectrum of organic acidurias and urea cycle disorders. Part 1: the initial presentation (vol 38, pg 1041, 2015)

Author

Kölker, Stefan, Cazorla, Angeles Garcia, Valayannopoulos, Vassili, Lund, Allan M., Burlina, Alberto B., Sykut-Cegielska, Jolanta, Wijburg, Frits A., Teles, Elisa Leão, Zeman, Jiri, Dionisi-Vici, Carlo, Barić, Ivo, Karall, Daniela, Augoustides-Savvopoulou, Persephone, Aksglaede, Lise, Arnoux, Jean-Baptiste, Avram, Paula, Baumgartner, Matthias R., Blasco-Alonso, Javier, Chabrol, Brigitte, Chakrapani, Anupam, Chapman, Kimberly, I Saladelafont, Elisenda Cortès, Couce, Maria L., de Meirleir, Linda, Dobbelaere, Dries, Dvorakova, Veronika, Furlan, Francesca, Gleich, Florian, Gradowska, Wanda, Grünewald, Stephanie, Jalan, Anil, Häberle, Johannes, Haege, Gisela, Lachmann, Robin, Laemmle, Alexander, Langereis, Eveline, de Lonlay, Pascale, Martinelli, Diego, Matsumoto, Shirou, Mühlhausen, Chris, de Baulny, Hélène Ogier, Ortez, Carlos, Peña-Quintana, Luis, Ramadža, Danijela Petković, Rodrigues, Esmeralda, Scholl-Bürgi, Sabine, Sokal, Etienne, Staufner, Christian, Summar, Marshall L., Thompson, Nicholas, Vara, Roshni, Pinera, Inmaculada Vives, Walter, John H., Williams, Monique, Burgard, Peter, Amsterdam Gastroenterology Endocrinology Metabolism, Paediatric Metabolic Diseases, and Other departments

Published
2015

41. Genotype-phenotype Correlation in Late-onset Glycogen Storage Disease Type II, Early Diagnosis and Prognostic Determinants

Author

Pandolfo, Massimo, Comi, Giacomo Pietro, Casimir, Georges, Abramowicz, Marc, Goyens, Philippe, Heinrichs, Claudine, Van den Bergh, Peter, De Meirleir, Linda, Remiche, Gauthier, Pandolfo, Massimo, Comi, Giacomo Pietro, Casimir, Georges, Abramowicz, Marc, Goyens, Philippe, Heinrichs, Claudine, Van den Bergh, Peter, De Meirleir, Linda, and Remiche, Gauthier

Abstract

Glycogen storage disease type II (GSDII) is an autosomal recessive lysosomal storage disorder caused by acid alpha-1,4-glucosidase (GAA) deficiency. This study aimed to provide an in-depth description of a late-onset GSDII (LO-GSDII) cohort (n=36) and assess potential genotype-phenotype correlation. We performed a clinical record-based study, some patients (n= 19) were also followed prospectively. Phenotypes were highly variable. We focused our clinical assessment onrespiratory failure, as it is the most frequent cause of death in LO-GSDII. In addition to standard spirometric measures, in a subgroup of patients (n = 10) we utilized a new tool, optoelectronic plethysmography (OEP), to investigate the pathophysiology of respiratory muscle impairment.The GAA gene was sequenced in every patient, and pathogenic mutations were identified inall of them. Almost all (35/36) patients carried the same mutation on one allele, IVS1-32-13T>G, which was in compound heterozygosity with a variety of other GAA mutations. To investigate genotype-phenotype correlation, we divided the patient cohort in two groups, according to the severity of the mutation on the second allele. The respiratory function study focused on diaphragmatic weakness. According to the change in forced vital capacity in supine position (ΔFVC), we defined patients with ΔFVC>25% ashaving diaphragmatic weakness (DW) and those with ΔFVC<25% as without diaphragmatic weakness (noDW). We measured pulmonary function and chest wall volumes using OEP inboth groups. We found a good correlation between the supine abdominal contribution to tidal volume (%VAB) and ΔFVC. Patients showed reduced chest wall and abdominal inspiratory capacity and low abdominal expiratory reserve volume. In terms of genotype-phenotype correlation, we counted more subjects in the group with severe second mutations (n=21) who had severe motor disability and respiratory dysfunction. However, this finding remains preliminary because differences were not, Doctorat en Sciences médicales (Médecine), info:eu-repo/semantics/nonPublished

Published
2016

42. Delineating the GRIN1 phenotypic spectrum: A distinct genetic NMDA receptor encephalopathy

Author

Lemke, Johannes R., Geider, Kirsten, Helbig, Katherine L., Heyne, Henrike O., Schutz, Hannah, Hentschel, Julia, Courage, Carolina, Depienne, Christel, Nava, Caroline, Heron, Delphine, Moller, Rikke S., Hjalgrim, Helle, Lal, Dennis, Neubauer, Bernd A., Nurnberg, Peter, Thiele, Holger, Kurlemann, Gerhard, Arnold, Georgianne L., Bhambhani, Vikas, Bartholdi, Deborah, Pedurupillay, Christeen Ramane J., Misceo, Doriana, Frengen, Eirik, Stromme, Petter, Dlugos, Dennis J., Doherty, Emily S., Bijlsma, Emilia K., Ruivenkamp, Claudia A., Hoffer, Mariette J. V., Goldstein, Amy, Rajan, Deepa S., Narayanan, Vinodh, Ramsey, Keri, Belnap, Newell, Schrauwen, Isabelle, Richholt, Ryan, Koeleman, Bobby P. C., Sa, Joaquim, Mendonca, Carla, de Kovel, Carolien G. F., Weckhuysen, Sarah, Hardies, Katia, De Jonghe, Peter, De Meirleir, Linda, Milh, Mathieu, Badens, Catherine, Lebrun, Marine, Busa, Tiffany, Francannet, Christine, Piton, Amelie, Riesch, Erik, Biskup, Saskia, Vogt, Heinrich, Dorn, Thomas, Helbig, Ingo, Michaud, Jacques L., Laube, Bodo, Syrbe, Steffen, Lemke, Johannes R., Geider, Kirsten, Helbig, Katherine L., Heyne, Henrike O., Schutz, Hannah, Hentschel, Julia, Courage, Carolina, Depienne, Christel, Nava, Caroline, Heron, Delphine, Moller, Rikke S., Hjalgrim, Helle, Lal, Dennis, Neubauer, Bernd A., Nurnberg, Peter, Thiele, Holger, Kurlemann, Gerhard, Arnold, Georgianne L., Bhambhani, Vikas, Bartholdi, Deborah, Pedurupillay, Christeen Ramane J., Misceo, Doriana, Frengen, Eirik, Stromme, Petter, Dlugos, Dennis J., Doherty, Emily S., Bijlsma, Emilia K., Ruivenkamp, Claudia A., Hoffer, Mariette J. V., Goldstein, Amy, Rajan, Deepa S., Narayanan, Vinodh, Ramsey, Keri, Belnap, Newell, Schrauwen, Isabelle, Richholt, Ryan, Koeleman, Bobby P. C., Sa, Joaquim, Mendonca, Carla, de Kovel, Carolien G. F., Weckhuysen, Sarah, Hardies, Katia, De Jonghe, Peter, De Meirleir, Linda, Milh, Mathieu, Badens, Catherine, Lebrun, Marine, Busa, Tiffany, Francannet, Christine, Piton, Amelie, Riesch, Erik, Biskup, Saskia, Vogt, Heinrich, Dorn, Thomas, Helbig, Ingo, Michaud, Jacques L., Laube, Bodo, and Syrbe, Steffen

Abstract

Objective:To determine the phenotypic spectrum caused by mutations in GRIN1 encoding the NMDA receptor subunit GluN1 and to investigate their underlying functional pathophysiology.Methods:We collected molecular and clinical data from several diagnostic and research cohorts. Functional consequences of GRIN1 mutations were investigated in Xenopus laevis oocytes.Results:We identified heterozygous de novo GRIN1 mutations in 14 individuals and reviewed the phenotypes of all 9 previously reported patients. These 23 individuals presented with a distinct phenotype of profound developmental delay, severe intellectual disability with absent speech, muscular hypotonia, hyperkinetic movement disorder, oculogyric crises, cortical blindness, generalized cerebral atrophy, and epilepsy. Mutations cluster within transmembrane segments and result in loss of channel function of varying severity with a dominant-negative effect. In addition, we describe 2 homozygous GRIN1 mutations (1 missense, 1 truncation), each segregating with severe neurodevelopmental phenotypes in consanguineous families.Conclusions:De novo GRIN1 mutations are associated with severe intellectual disability with cortical visual impairment as well as oculomotor and movement disorders being discriminating phenotypic features. Loss of NMDA receptor function appears to be the underlying disease mechanism. The identification of both heterozygous and homozygous mutations blurs the borders of dominant and recessive inheritance of GRIN1-associated disorders.

Published
2016

43. Effect of supporting 3D-garment on gait postural stability in children with bilateral spastic cerebral palsy

Author

Degelaen, Marc, De Borre, Ludo, Buyl, Ronald, Kerckhofs, Eric, De Meirleir, Linda, Dan, Bernard, Degelaen, Marc, De Borre, Ludo, Buyl, Ronald, Kerckhofs, Eric, De Meirleir, Linda, and Dan, Bernard

Abstract

BACKGROUND: Children with cerebral palsy show dysfunctional postural control which interferes with their functional performance and daily-life activities. OBJECTIVE: The aim of the study was to identify the effect of a 3D supporting garment on trunk postural control and interjoint coordination during gait in children with bilateral cerebral palsy. METHODS: We analyzed tridimensional trunk motion, trunk-thigh and interjoint coordination in 15 4-10 year-old children with bilateral spastic cerebral palsy (GMFCS I or II) and 16 4-10 year-old typically developing children while walking with or without a supporting garment. RESULTS: We found significantly changes in the coordination between trunk and lower limbs in children with cerebral palsy. Step velocity and cadence both increased significantly in children with cerebral palsy but in controls, the cadence remained unaltered. Interjoint coordination between hip-knee and knee-ankle was altered during the stance phase only in the subgroup of children with cerebral palsy without any limitations in ankle joint passive range of motion. CONCLUSION: 3D supporting garments improve trunk-thigh and lower limb interjoint coordination in walking in children with bilateral cerebral palsy., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2016

44. Database crossing allows better understanding of neuromuscular disorders epidemiology: The Belgian example

Author

Bleyenheuft, Corinne, Van Damme, Philip, Goemans, Nathalie, De Bleecker, Jan, Van Coster, Rudy, de Jonghe, Peter, Beysens, D., Van den Bergh, Peter, Christiaens, Florence, Maertens de Noordhout, Alain, Haan, J, De Meirleir, Linda, Remiche, Gauthier, Deconinck, Nicolas, Depuijdt, E, Servais, Laurent, Bleyenheuft, Corinne, Van Damme, Philip, Goemans, Nathalie, De Bleecker, Jan, Van Coster, Rudy, de Jonghe, Peter, Beysens, D., Van den Bergh, Peter, Christiaens, Florence, Maertens de Noordhout, Alain, Haan, J, De Meirleir, Linda, Remiche, Gauthier, Deconinck, Nicolas, Depuijdt, E, and Servais, Laurent

Abstract

info:eu-repo/semantics/published

Published
2016

45. Shwachman–Diamond syndrome presenting with early ichthyosis, associated dermal and epidermal intracellular lipid droplets, hypoglycemia, and later distinctive clinical SDS phenotype

Author

Scalais, Emmanuel, Connerotte, Anne-Catherine, Despontin, Karine, Biver, Armand, Ceuterick-De Groote, Chantal, Alders, Marielle, Kolivras, Athanassios, Hachem, Jean Pierre, De Meirleir, Linda, Scalais, Emmanuel, Connerotte, Anne-Catherine, Despontin, Karine, Biver, Armand, Ceuterick-De Groote, Chantal, Alders, Marielle, Kolivras, Athanassios, Hachem, Jean Pierre, and De Meirleir, Linda

Abstract

Shwachman–Diamond syndrome (SDS) is a recessive ribosomopathy, characterized by bone marrow failure and exocrine pancreatic insufficiency (ePI) often associated with neurodevelopmental and skeletal abnormalities. The aim of this report is to describe a SDS patient with early ichthyosis associated with dermal and epidermal intracellular lipid droplets (iLDs), hypoglycemia and later a distinctive clinical SDS phenotype. At 3 months of age, she had ichthyosis, growth retardation, and failure to thrive. She had not cytopenia. Ultrasonography (US) showed pancreatic diffuse high echogenicity. Subsequently fasting hypoketotic hypoglycemia occurred without permanent hepatomegaly or hyperlipidemia. Continuous gavage feeding was followed by clinical improvement including ichthyosis and hypoglycemia. After 14 months of age, she developed persistent neutropenia and ePI consistent with SDS. The ichthyotic skin biopsy, performed at 5 months of age, disclosed iLDs in all epidermal layers, in melanocytes, eccrine sweat glands, Schwann cells and dermal fibroblasts. These iLDs were reminiscent of those described in Dorfman–Chanarin syndrome (DCS) or Wolman's disease. Both LIPA and CGI-58 analysis did not revealed pathogenic mutation. By sequencing SBDS, a compound heterozygous for a previously reported gene mutation (c.258 + 2T>C) and a novel mutation (c.284T>G) were found. Defective SBDS may hypothetically interfere as in DCS, with neutral lipid metabolism and play a role in the SDS phenotype such as ichthyosis with dermal and epidermal iLDs and hypoglycemia. This interference with neutral lipid metabolism must most likely occur in the cytoplasm compartment as in DCS and not in the lysosomal compartment as in Wolman's disease. © 2016 Wiley Periodicals, Inc., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2016

47. The phenotypic spectrum of organic acidurias and urea cycle disorders. Part 1: the initial presentation.

Author

UCL - SSS/IREC/PEDI - Pôle de Pédiatrie, UCL - (SLuc) Service de gastro-entérologie et hépatologie pédiatrique, Kölker, Stefan, Garcia-Cazorla, Angeles, Cazorla, Angeles Garcia, Valayannopoulos, Vassili, Lund, Allan M, Burlina, Alberto B, Sykut-Cegielska, Jolanta, Wijburg, Frits A, Teles, Elisa Leão, Zeman, Jiri, Dionisi-Vici, Carlo, Barić, Ivo, Karall, Daniela, Augoustides-Savvopoulou, Persephone, Aksglaede, Lise, Arnoux, Jean-Baptiste, Avram, Paula, Baumgartner, Matthias R, Blasco-Alonso, Javier, Chabrol, Brigitte, Chakrapani, Anupam, Chapman, Kimberly, I Saladelafont, Elisenda Cortès, Couce, Maria L, de Meirleir, Linda, Dobbelaere, Dries, Dvorakova, Veronika, Furlan, Francesca, Gleich, Florian, Gradowska, Wanda, Grünewald, Stephanie, Jalan, Anil, Häberle, Johannes, Haege, Gisela, Lachmann, Robin, Laemmle, Alexander, Langereis, Eveline, de Lonlay, Pascale, Martinelli, Diego, Matsumoto, Shirou, Mühlhausen, Chris, de Baulny, Hélène Ogier, Ortez, Carlos, Peña-Quintana, Luis, Ramadža, Danijela Petković, Rodrigues, Esmeralda, Scholl-Bürgi, Sabine, Sokal, Etienne, Staufner, Christian, Summar, Marshall L, Thompson, Nicholas, Vara, Roshni, Pinera, Inmaculada Vives, Walter, John H, Williams, Monique, Burgard, Peter, UCL - SSS/IREC/PEDI - Pôle de Pédiatrie, UCL - (SLuc) Service de gastro-entérologie et hépatologie pédiatrique, Kölker, Stefan, Garcia-Cazorla, Angeles, Cazorla, Angeles Garcia, Valayannopoulos, Vassili, Lund, Allan M, Burlina, Alberto B, Sykut-Cegielska, Jolanta, Wijburg, Frits A, Teles, Elisa Leão, Zeman, Jiri, Dionisi-Vici, Carlo, Barić, Ivo, Karall, Daniela, Augoustides-Savvopoulou, Persephone, Aksglaede, Lise, Arnoux, Jean-Baptiste, Avram, Paula, Baumgartner, Matthias R, Blasco-Alonso, Javier, Chabrol, Brigitte, Chakrapani, Anupam, Chapman, Kimberly, I Saladelafont, Elisenda Cortès, Couce, Maria L, de Meirleir, Linda, Dobbelaere, Dries, Dvorakova, Veronika, Furlan, Francesca, Gleich, Florian, Gradowska, Wanda, Grünewald, Stephanie, Jalan, Anil, Häberle, Johannes, Haege, Gisela, Lachmann, Robin, Laemmle, Alexander, Langereis, Eveline, de Lonlay, Pascale, Martinelli, Diego, Matsumoto, Shirou, Mühlhausen, Chris, de Baulny, Hélène Ogier, Ortez, Carlos, Peña-Quintana, Luis, Ramadža, Danijela Petković, Rodrigues, Esmeralda, Scholl-Bürgi, Sabine, Sokal, Etienne, Staufner, Christian, Summar, Marshall L, Thompson, Nicholas, Vara, Roshni, Pinera, Inmaculada Vives, Walter, John H, Williams, Monique, and Burgard, Peter

Abstract

BACKGROUND: The clinical presentation of patients with organic acidurias (OAD) and urea cycle disorders (UCD) is variable; symptoms are often non-specific. AIMS/METHODS: To improve the knowledge about OAD and UCD the E-IMD consortium established a web-based patient registry. RESULTS: We registered 795 patients with OAD (n = 452) and UCD (n = 343), with ornithine transcarbamylase (OTC) deficiency (n = 196), glutaric aciduria type 1 (GA1; n = 150) and methylmalonic aciduria (MMA; n = 149) being the most frequent diseases. Overall, 548 patients (69 %) were symptomatic. The majority of them (n = 463) presented with acute metabolic crisis during (n = 220) or after the newborn period (n = 243) frequently demonstrating impaired consciousness, vomiting and/or muscular hypotonia. Neonatal onset of symptoms was most frequent in argininosuccinic synthetase and lyase deficiency and carbamylphosphate 1 synthetase deficiency, unexpectedly low in male OTC deficiency, and least frequently in GA1 and female OTC deficiency. For patients with MMA, propionic aciduria (PA) and OTC deficiency (male and female), hyperammonemia was more severe in metabolic crises during than after the newborn period, whereas metabolic acidosis tended to be more severe in MMA and PA patients with late onset of symptoms. Symptomatic patients without metabolic crises (n = 94) often presented with a movement disorder, mental retardation, epilepsy and psychiatric disorders (the latter in UCD only). CONCLUSIONS: The initial presentation varies widely in OAD and UCD patients. This is a challenge for rapid diagnosis and early start of treatment. Patients with a sepsis-like neonatal crisis and those with late-onset of symptoms are both at risk of delayed or missed diagnosis.

Published
2015

48. The phenotypic spectrum of organic acidurias and urea cycle disorders. Part 2: the evolving clinical phenotype.

Author

UCL - SSS/IREC/PEDI - Pôle de Pédiatrie, UCL - (SLuc) Service de gastro-entérologie et hépatologie pédiatrique, Kölker, Stefan, Valayannopoulos, Vassili, Burlina, Alberto B, Sykut-Cegielska, Jolanta, Wijburg, Frits A, Teles, Elisa Leão, Zeman, Jiri, Dionisi-Vici, Carlo, Barić, Ivo, Karall, Daniela, Arnoux, Jean-Baptiste, Avram, Paula, Baumgartner, Matthias R, Blasco-Alonso, Javier, Boy, S P Nikolas, Rasmussen, Marlene Bøgehus, Burgard, Peter, Chabrol, Brigitte, Chakrapani, Anupam, Chapman, Kimberly, Cortès I Saladelafont, Elisenda, Couce, Maria L, de Meirleir, Linda, Dobbelaere, Dries, Furlan, Francesca, Gleich, Florian, González, Maria Julieta, Gradowska, Wanda, Grünewald, Stephanie, Honzik, Tomas, Hörster, Friederike, Ioannou, Hariklea, Jalan, Anil, Häberle, Johannes, Haege, Gisela, Langereis, Eveline, de Lonlay, Pascale, Martinelli, Diego, Matsumoto, Shirou, Mühlhausen, Chris, Murphy, Elaine, de Baulny, Hélène Ogier, Ortez, Carlos, Pedrón, Consuelo C, Pintos-Morell, Guillem, Pena-Quintana, Luis, Ramadža, Danijela Petković, Rodrigues, Esmeralda, Scholl-Bürgi, Sabine, Sokal, Etienne, Summar, Marshall L, Thompson, Nicholas, Vara, Roshni, Pinera, Inmaculada Vives, Walter, John H, Williams, Monique, Lund, Allan M, Garcia-Cazorla, Angeles, Garcia Cazorla, Angeles, UCL - SSS/IREC/PEDI - Pôle de Pédiatrie, UCL - (SLuc) Service de gastro-entérologie et hépatologie pédiatrique, Kölker, Stefan, Valayannopoulos, Vassili, Burlina, Alberto B, Sykut-Cegielska, Jolanta, Wijburg, Frits A, Teles, Elisa Leão, Zeman, Jiri, Dionisi-Vici, Carlo, Barić, Ivo, Karall, Daniela, Arnoux, Jean-Baptiste, Avram, Paula, Baumgartner, Matthias R, Blasco-Alonso, Javier, Boy, S P Nikolas, Rasmussen, Marlene Bøgehus, Burgard, Peter, Chabrol, Brigitte, Chakrapani, Anupam, Chapman, Kimberly, Cortès I Saladelafont, Elisenda, Couce, Maria L, de Meirleir, Linda, Dobbelaere, Dries, Furlan, Francesca, Gleich, Florian, González, Maria Julieta, Gradowska, Wanda, Grünewald, Stephanie, Honzik, Tomas, Hörster, Friederike, Ioannou, Hariklea, Jalan, Anil, Häberle, Johannes, Haege, Gisela, Langereis, Eveline, de Lonlay, Pascale, Martinelli, Diego, Matsumoto, Shirou, Mühlhausen, Chris, Murphy, Elaine, de Baulny, Hélène Ogier, Ortez, Carlos, Pedrón, Consuelo C, Pintos-Morell, Guillem, Pena-Quintana, Luis, Ramadža, Danijela Petković, Rodrigues, Esmeralda, Scholl-Bürgi, Sabine, Sokal, Etienne, Summar, Marshall L, Thompson, Nicholas, Vara, Roshni, Pinera, Inmaculada Vives, Walter, John H, Williams, Monique, Lund, Allan M, Garcia-Cazorla, Angeles, and Garcia Cazorla, Angeles

Abstract

BACKGROUND: The disease course and long-term outcome of patients with organic acidurias (OAD) and urea cycle disorders (UCD) are incompletely understood. AIMS: To evaluate the complex clinical phenotype of OAD and UCD patients at different ages. RESULTS: Acquired microcephaly and movement disorders were common in OAD and UCD highlighting that the brain is the major organ involved in these diseases. Cardiomyopathy [methylmalonic (MMA) and propionic aciduria (PA)], prolonged QTc interval (PA), optic nerve atrophy [MMA, isovaleric aciduria (IVA)], pancytopenia (PA), and macrocephaly [glutaric aciduria type 1 (GA1)] were exclusively found in OAD patients, whereas hepatic involvement was more frequent in UCD patients, in particular in argininosuccinate lyase (ASL) deficiency. Chronic renal failure was often found in MMA, with highest frequency in mut(0) patients. Unexpectedly, chronic renal failure was also observed in adolescent and adult patients with GA1 and ASL deficiency. It had a similar frequency in patients with or without a movement disorder suggesting different pathophysiology. Thirteen patients (classic OAD: 3, UCD: 10) died during the study interval, ten of them during the initial metabolic crisis in the newborn period. Male patients with late-onset ornithine transcarbamylase deficiency were presumably overrepresented in the study population. CONCLUSIONS: Neurologic impairment is common in OAD and UCD, whereas the involvement of other organs (heart, liver, kidneys, eyes) follows a disease-specific pattern. The identification of unexpected chronic renal failure in GA1 and ASL deficiency emphasizes the importance of a systematic follow-up in patients with rare diseases.

Published
2015

49. Two siblings with homozygous pathogenic splice-site variant in mitochondrial asparaginyl-tRNA synthetase (NARS2)

Author

Vanlander, Arnaud Vincent, Smet, Joel, De Paepe, Boel, De Latter, Elien, Van Coster, Rudy, Menten, Björn, Sante, Tom, Vergult, Sarah, Vantomme, Lies, De Meirleir, Linda, Seneca, Sara, Pearce, Sarah S.F., Powell, Christopher C.A., Minczuk, Michal, Michotte, Alex, Vanlander, Arnaud Vincent, Smet, Joel, De Paepe, Boel, De Latter, Elien, Van Coster, Rudy, Menten, Björn, Sante, Tom, Vergult, Sarah, Vantomme, Lies, De Meirleir, Linda, Seneca, Sara, Pearce, Sarah S.F., Powell, Christopher C.A., Minczuk, Michal, and Michotte, Alex

Abstract

A homozygous missense mutation (c.822G>C) was found in the gene encoding the mitochondrial asparaginyl-tRNA synthetase (NARS2) in two siblings born to consanguineous parents. These siblings presented with different phenotypes: one had mild intellectual disability and epilepsy in childhood, whereas the other had severe myopathy. Biochemical analysis of the oxidative phosphorylation (OXPHOS) complexes in both siblings revealed a combined complex I and IV deficiency in skeletal muscle. In-gel activity staining after blue native-polyacrylamide gel electrophoresis confirmed the decreased activity of complex I and IV, and, in addition, showed the presence of complex V subcomplexes. Considering the consanguineous descent, homozygosity mapping and whole-exome sequencing were combined revealing the presence of one single missense mutation in the shared homozygous region. The c.822G>C variant affects the 3′ splice site of exon 7, leading to skipping of the whole exon 7 and a part of exon 8 in the NARS2 mRNA. In EBV-transformed lymphoblasts, a specific decrease in the amount of charged mt-tRNAAsn was demonstrated as compared with controls. This confirmed the pathogenic nature of the variant. To conclude, the reported variant in NARS2 results in a combined OXPHOS complex deficiency involving complex I and IV, making NARS2 a new member of disease-associated aaRS2., SCOPUS: ar.j, FLWIN, info:eu-repo/semantics/published

Published
2015

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