Search

Your search keyword '"Osaka H"' showing total 10 results
Start Over Author "Osaka H" Database OAIster
10 results on '"Osaka H"'

1. On operators which attain their norm on every reducing subspace

Author

Ramesh, G., Osaka, H., Ramesh, G., and Osaka, H.

Abstract

In this article, first, we study the spectral properties of operators which attain their norm on every reducing subspace and then we study the structure of normal and quasinormal operators in this class. At the end we give a description of paranormal operators whose adjoint is also paranormal. This gives a direct proof of the fact that an operator is normal if and only if the operator and its adjoint are paranormal. © 2022, Tusi Mathematical Research Group (TMRG).

Published
2022

2. On operators which attain their norm on every reducing subspace

Author

Ramesh, G., Osaka, H., Ramesh, G., and Osaka, H.

Abstract

In this article, first, we study the spectral properties of operators which attain their norm on every reducing subspace and then we study the structure of normal and quasinormal operators in this class. At the end we give a description of paranormal operators whose adjoint is also paranormal. This gives a direct proof of the fact that an operator is normal if and only if the operator and its adjoint are paranormal. © 2022, Tusi Mathematical Research Group (TMRG).

Published
2022

3. On operators which attain their norm on every reducing subspace

Author

Ramesh, G., Osaka, H., Ramesh, G., and Osaka, H.

Abstract

In this article, first, we study the spectral properties of operators which attain their norm on every reducing subspace and then we study the structure of normal and quasinormal operators in this class. At the end we give a description of paranormal operators whose adjoint is also paranormal. This gives a direct proof of the fact that an operator is normal if and only if the operator and its adjoint are paranormal. © 2022, Tusi Mathematical Research Group (TMRG).

Published
2022

4. Safety and efficacy of once-daily risdiplam in type 2 and non-ambulant type 3 spinal muscular atrophy (SUNFISH part 2): a phase 3, double-blind, randomised, placebo-controlled trial

Author

Mercuri, Eugenio Maria, Deconinck, N., Mazzone, Elena Stacy, Nascimento, A., Oskoui, M., Saito, K., Vuillerot, C., Baranello, Giovanni, Boespflug-Tanguy, O., Goemans, N., Kirschner, J., Kostera-Pruszczyk, A., Servais, L., Gerber, M., Gorni, K., Khwaja, O., Kletzl, H., Scalco, R. S., Staunton, H., Yeung, W. Y., Martin, Craig, Fontoura, P., Day, J. W., Volpe, J. J., Posner, J., Kellner, U., Quinlivan, R., Fuerst-Recktenwald, S., Marquet, A., Mulhardt, N., Trundell, D., Daron, A., Delstanche, S., Romain, B., Dal Farra, F., Schneider, O., Balikova, I., Delbeke, P., Joniau, I., Tahon, V., Wittevrongel, S., De Vos, E., Casteels, I., De Waele, L., Cassiman, C., Prove, L., Kinoo, D., Vancampenhout, L., Van Den Hauwe, M., Van Impe, A., Prufer de Queiroz Campos Araujo, A., Chacon Pereira, A., Nardes, F., Haefeli, L., Rossetto, J., Almeida Pereira, J., Ferreira Rebel, M., Campbell, C., Sharan, S., Mcdonald, W., Scholtes, C., Mah, J., Sframeli, M., Chiu, A., Hagel, J., Beneish, R., Pham, C., Toffoli, D., Arpin, S., Turgeon Desilets, S., Wang, Y., Hu, C., Huang, J., Qian, C., Shen, L., Xiao, Y., Zhou, Z., Li, H., Wang, S., Xiong, H., Chang, X., Dong, H., Liu, Y., Sang, T., Wei, C., Wen, J., Cao, Y., Lv, X., Zhao, J., Li, W., Qin, L., Barisic, N., Galiot Delic, M., Ivkic, P. K., Vukojevic, N., Kern, I., Najdanovic, B., Skugor, M., Gidaro, T., Seferian, A., De Lucia, Sara Sofia, Barreau, E., Mnafek, N., Momtchilova, M. M., Peche, H., Valherie, C., Grange, A., Lilien, C., Milascevic, D., Tachibana, S., Ravelli, C., Cardas, R., Vanden Brande, L., Davion, J. -B., Coopman, S., Bouacha, I., Debruyne, P., Defoort, S., Derlyn, G., Leroy, F., Danjoux, L., Guilbaud, J., Desguerre, I., Barnerias, C., Semeraro, M., Bremond-Gignac, D., Bruere, L., Rateaux, M., Deladriere, E., Germa, V., Pereon, Y., Magot, A., Mercie, S., Billaud, F., Le Goff, L., Letellier, G., Portefaix, A., Fontaine, S., De-Montferrand, C., Le-Goff, L., Saidi, M., Bouzid, N., Barriere, A., Tinat, M., Dreesbach, M., Lagreze, W., Michaelis, B., Molnar, F., Seger, D., Vogt, S., Bertini, Enrico Silvio, D'Amico, Adele, Petroni, S., Bonetti, A. M., Carlesi, A., Mizzoni, I., Bruno, C., Priolo, E., Rao, G., Morando, S., Tacchetti, P., Zuffi, A., Comi, G. P., Brusa, R., Corti, Serafino, Daniele, V., Govoni, A., Magri, F., Minorini, V., Osnaghi, S. G., Abbati, F., Fassini, F., Foa, M., Lopopolo, A., Meneri, M., Zoppas, F., Parente, V., Masson, R., Bianchi Marzoli, Stefania, Santarsiero, Rocco Domenico, Garcia Sierra, M., Tremolada, G., Arnoldi, M. T., Vigano, M., Zanin, Renata, Amorelli, Giulia Maria, Barresi, C., D'Amico, Guglielmo, Orazi, Lorenzo, Coratti, Giorgia, Haginoya, K., Kato, A., Morishita, Y., Kira, R., Akiyama, K., Goto, M., Mori, Y., Okamoto, M., Tsutsui, S., Takatsuji, Y., Tanaka, A., Komaki, H., Suzuki, I., Takeuchi, M., Todoroki, D., Watanabe, S., Omori, M., Matsubayashi, T., Inakazu, E., Nagura, H., Suzuki, A., Osaka, H., Ohashi, M., Ishikawa, N., Harada, Y., Fudeyasu, K., Hirata, K., Michiue, K., Ueda, K., Yashiro, S., Seki, M., Sano, N., Uemura, A., Fukuyama, K., Matsumoto, Y., Miyazaki, H., Shibata, M., Kobayashi, K., Nakamura, Y., Takeshima, Y., Kuma, M., Fraczek, A., Jedrzejowska, M., Lusakowska, A., Czeszyk-Piotrowicz, A., Hautz, W., Rakusiewicz, K., Burlewicz, M., Gierlak-Wojcicka, Z., Kepa, M., Sikorski, A., Sobieraj, M., Mazurkiewicz-Beldzinska, M., Lemska, A., Modrzejewska, S., Koberda, M., Stodolska-Koberda, U., Waskowska, A., Kolendo, J., Sobierajska-Rek, A., Steinborn, B., Dalz, M., Grabowska, J., Hajduk, W., Janasiewicz-Karachitos, J., Klimas, M., Stopa, M., Gajewska, E., Pusz, B., Vlodavets, D., Melnik, E., Leppenen, N., Yupatova, N., Monakhova, A., Papina, Y., Shidlovsckaia, O., Milic Rasic, V., Brankovic, V., Kosac, A., Djokic, O., Jaksic, V., Pepic, A., Martinovic, J., Munell Casadesus, F., Tizzano, E., Martin Begue, N., Wolley Dod, C., Subira, O., Planas Pascual, B., Toro Tamargo, E., Madruga Garrido, M., Medina Romero, J. D., Salinas, M. P., Nascimento Osorio, A., Diaz Cortes, A., Jimenez Ganan, E., Suh, S. D., Medina Cantillo, J., Moya, O., Padros, N., Roca Urraca, S., Gonzalez Valdivia, H., Pascual Pascual, S., de Manuel, S., Noval Martin, S., Burnham, P., Espinosa Garcia, S., Martinez Moreno, M., Topaloglu, H., Oncel, I., Eroglu Ertugrul, N., Konuskan, B., Eldem, B., Kadayifcilar, S., Alemdaroglu, I., Ayse Karaduman, A., Tunca Yilmaz, O., Bilgin, N., Sari, S., Chiriboga, C., Kane, S., Lee, J., Rome-Martin, D., Beres, S., Duong, T., Gee, R., Dunaway Young, S., Mercuri E. (ORCID:0000-0002-9851-5365), Mazzone E. S., Baranello G., Martin C., De Lucia S., Bertini E., D'Amico A., Corti S., Bianchi Marzoli S., Santarsiero D., Zanin R., Amorelli G. M., D'Amico G., Orazi L., Coratti G. (ORCID:0000-0001-6666-5628), Mercuri, Eugenio Maria, Deconinck, N., Mazzone, Elena Stacy, Nascimento, A., Oskoui, M., Saito, K., Vuillerot, C., Baranello, Giovanni, Boespflug-Tanguy, O., Goemans, N., Kirschner, J., Kostera-Pruszczyk, A., Servais, L., Gerber, M., Gorni, K., Khwaja, O., Kletzl, H., Scalco, R. S., Staunton, H., Yeung, W. Y., Martin, Craig, Fontoura, P., Day, J. W., Volpe, J. J., Posner, J., Kellner, U., Quinlivan, R., Fuerst-Recktenwald, S., Marquet, A., Mulhardt, N., Trundell, D., Daron, A., Delstanche, S., Romain, B., Dal Farra, F., Schneider, O., Balikova, I., Delbeke, P., Joniau, I., Tahon, V., Wittevrongel, S., De Vos, E., Casteels, I., De Waele, L., Cassiman, C., Prove, L., Kinoo, D., Vancampenhout, L., Van Den Hauwe, M., Van Impe, A., Prufer de Queiroz Campos Araujo, A., Chacon Pereira, A., Nardes, F., Haefeli, L., Rossetto, J., Almeida Pereira, J., Ferreira Rebel, M., Campbell, C., Sharan, S., Mcdonald, W., Scholtes, C., Mah, J., Sframeli, M., Chiu, A., Hagel, J., Beneish, R., Pham, C., Toffoli, D., Arpin, S., Turgeon Desilets, S., Wang, Y., Hu, C., Huang, J., Qian, C., Shen, L., Xiao, Y., Zhou, Z., Li, H., Wang, S., Xiong, H., Chang, X., Dong, H., Liu, Y., Sang, T., Wei, C., Wen, J., Cao, Y., Lv, X., Zhao, J., Li, W., Qin, L., Barisic, N., Galiot Delic, M., Ivkic, P. K., Vukojevic, N., Kern, I., Najdanovic, B., Skugor, M., Gidaro, T., Seferian, A., De Lucia, Sara Sofia, Barreau, E., Mnafek, N., Momtchilova, M. M., Peche, H., Valherie, C., Grange, A., Lilien, C., Milascevic, D., Tachibana, S., Ravelli, C., Cardas, R., Vanden Brande, L., Davion, J. -B., Coopman, S., Bouacha, I., Debruyne, P., Defoort, S., Derlyn, G., Leroy, F., Danjoux, L., Guilbaud, J., Desguerre, I., Barnerias, C., Semeraro, M., Bremond-Gignac, D., Bruere, L., Rateaux, M., Deladriere, E., Germa, V., Pereon, Y., Magot, A., Mercie, S., Billaud, F., Le Goff, L., Letellier, G., Portefaix, A., Fontaine, S., De-Montferrand, C., Le-Goff, L., Saidi, M., Bouzid, N., Barriere, A., Tinat, M., Dreesbach, M., Lagreze, W., Michaelis, B., Molnar, F., Seger, D., Vogt, S., Bertini, Enrico Silvio, D'Amico, Adele, Petroni, S., Bonetti, A. M., Carlesi, A., Mizzoni, I., Bruno, C., Priolo, E., Rao, G., Morando, S., Tacchetti, P., Zuffi, A., Comi, G. P., Brusa, R., Corti, Serafino, Daniele, V., Govoni, A., Magri, F., Minorini, V., Osnaghi, S. G., Abbati, F., Fassini, F., Foa, M., Lopopolo, A., Meneri, M., Zoppas, F., Parente, V., Masson, R., Bianchi Marzoli, Stefania, Santarsiero, Rocco Domenico, Garcia Sierra, M., Tremolada, G., Arnoldi, M. T., Vigano, M., Zanin, Renata, Amorelli, Giulia Maria, Barresi, C., D'Amico, Guglielmo, Orazi, Lorenzo, Coratti, Giorgia, Haginoya, K., Kato, A., Morishita, Y., Kira, R., Akiyama, K., Goto, M., Mori, Y., Okamoto, M., Tsutsui, S., Takatsuji, Y., Tanaka, A., Komaki, H., Suzuki, I., Takeuchi, M., Todoroki, D., Watanabe, S., Omori, M., Matsubayashi, T., Inakazu, E., Nagura, H., Suzuki, A., Osaka, H., Ohashi, M., Ishikawa, N., Harada, Y., Fudeyasu, K., Hirata, K., Michiue, K., Ueda, K., Yashiro, S., Seki, M., Sano, N., Uemura, A., Fukuyama, K., Matsumoto, Y., Miyazaki, H., Shibata, M., Kobayashi, K., Nakamura, Y., Takeshima, Y., Kuma, M., Fraczek, A., Jedrzejowska, M., Lusakowska, A., Czeszyk-Piotrowicz, A., Hautz, W., Rakusiewicz, K., Burlewicz, M., Gierlak-Wojcicka, Z., Kepa, M., Sikorski, A., Sobieraj, M., Mazurkiewicz-Beldzinska, M., Lemska, A., Modrzejewska, S., Koberda, M., Stodolska-Koberda, U., Waskowska, A., Kolendo, J., Sobierajska-Rek, A., Steinborn, B., Dalz, M., Grabowska, J., Hajduk, W., Janasiewicz-Karachitos, J., Klimas, M., Stopa, M., Gajewska, E., Pusz, B., Vlodavets, D., Melnik, E., Leppenen, N., Yupatova, N., Monakhova, A., Papina, Y., Shidlovsckaia, O., Milic Rasic, V., Brankovic, V., Kosac, A., Djokic, O., Jaksic, V., Pepic, A., Martinovic, J., Munell Casadesus, F., Tizzano, E., Martin Begue, N., Wolley Dod, C., Subira, O., Planas Pascual, B., Toro Tamargo, E., Madruga Garrido, M., Medina Romero, J. D., Salinas, M. P., Nascimento Osorio, A., Diaz Cortes, A., Jimenez Ganan, E., Suh, S. D., Medina Cantillo, J., Moya, O., Padros, N., Roca Urraca, S., Gonzalez Valdivia, H., Pascual Pascual, S., de Manuel, S., Noval Martin, S., Burnham, P., Espinosa Garcia, S., Martinez Moreno, M., Topaloglu, H., Oncel, I., Eroglu Ertugrul, N., Konuskan, B., Eldem, B., Kadayifcilar, S., Alemdaroglu, I., Ayse Karaduman, A., Tunca Yilmaz, O., Bilgin, N., Sari, S., Chiriboga, C., Kane, S., Lee, J., Rome-Martin, D., Beres, S., Duong, T., Gee, R., Dunaway Young, S., Mercuri E. (ORCID:0000-0002-9851-5365), Mazzone E. S., Baranello G., Martin C., De Lucia S., Bertini E., D'Amico A., Corti S., Bianchi Marzoli S., Santarsiero D., Zanin R., Amorelli G. M., D'Amico G., Orazi L., and Coratti G. (ORCID:0000-0001-6666-5628)

Abstract

Background: Risdiplam is an oral small molecule approved for the treatment of patients with spinal muscular atrophy, with approval for use in patients with type 2 and type 3 spinal muscular atrophy granted on the basis of unpublished data. The drug modifies pre-mRNA splicing of the SMN2 gene to increase production of functional SMN. We aimed to investigate the safety and efficacy of risdiplam in patients with type 2 or non-ambulant type 3 spinal muscular atrophy. Methods: In this phase 3, randomised, double-blind, placebo-controlled study, patients aged 2–25 years with confirmed 5q autosomal recessive type 2 or type 3 spinal muscular atrophy were recruited from 42 hospitals in 14 countries across Europe, North America, South America, and Asia. Participants were eligible if they were non-ambulant, could sit independently, and had a score of at least 2 in entry item A of the Revised Upper Limb Module. Patients were stratified by age and randomly assigned (2:1) to receive either daily oral risdiplam, at a dose of 5·00 mg (for individuals weighing ≥20 kg) or 0·25 mg/kg (for individuals weighing <20 kg), or daily oral placebo (matched to risdiplam in colour and taste). Randomisation was conducted by permutated block randomisation with a computerised system run by an external party. Patients, investigators, and all individuals in direct contact with patients were masked to treatment assignment. The primary endpoint was the change from baseline in the 32-item Motor Function Measure total score at month 12. All individuals who were randomly assigned to risdiplam or placebo, and who did not meet the prespecified missing item criteria for exclusion, were included in the primary efficacy analysis. Individuals who received at least one dose of risdiplam or placebo were included in the safety analysis. SUNFISH is registered with ClinicalTrials.gov, NCT02908685. Recruitment is closed; the study is ongoing. Findings: Between Oct 9, 2017, and Sept 4, 2018, 180 patients were rand

Published
2022

5. Phenotype and genotype in 101 males with X-linked creatine transporter deficiency

Author

UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - SSS/IREC - Institut de recherche expérimentale et clinique, UCL - (SLuc) Centre de génétique médicale UCL, UCL - (SLuc) Service de neurologie pédiatrique, van de Kamp, J M, Betsalel, O T, Mercimek-Mahmutoglu, S, Abulhoul, L, Grünewald, S, Anselm, I, Azzouz, H, Bratkovic, D, de Brouwer, A, Hamel, B, Kleefstra, T, Yntema, H, Campistol, J, Vilaseca, M A, Cheillan, D, D'Hooghe, M, Diogo, L, Garcia, P, Valongo, C, Fonseca, M, Frints, S, Wilcken, B, von der Haar, S, Meijers-Heijboer, H E, Hofstede, F, Johnson, D, Kant, S G, Lion-Francois, L, Pitelet, G, Longo, N, Maat-Kievit, J A, Monteiro, J P, Munnich, A, Muntau, A C, Nassogne, Marie-Cécile, Osaka, H, Ounap, K, Pinard, J M, Quijano-Roy, S, Poggenburg, I, Poplawski, N, Abdul-Rahman, O, Ribes, A, Arias, A, Yaplito-Lee, J, Schulze, A, Schwartz, C E, Schwenger, S, Soares, G, Sznajer, Yves, Valayannopoulos, V, Van Esch, H, Waltz, S, Wamelink, M M C, Pouwels, P J W, Errami, A, van der Knaap, M S, Jakobs, C, Mancini, G M, Salomons, G S, UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - SSS/IREC - Institut de recherche expérimentale et clinique, UCL - (SLuc) Centre de génétique médicale UCL, UCL - (SLuc) Service de neurologie pédiatrique, van de Kamp, J M, Betsalel, O T, Mercimek-Mahmutoglu, S, Abulhoul, L, Grünewald, S, Anselm, I, Azzouz, H, Bratkovic, D, de Brouwer, A, Hamel, B, Kleefstra, T, Yntema, H, Campistol, J, Vilaseca, M A, Cheillan, D, D'Hooghe, M, Diogo, L, Garcia, P, Valongo, C, Fonseca, M, Frints, S, Wilcken, B, von der Haar, S, Meijers-Heijboer, H E, Hofstede, F, Johnson, D, Kant, S G, Lion-Francois, L, Pitelet, G, Longo, N, Maat-Kievit, J A, Monteiro, J P, Munnich, A, Muntau, A C, Nassogne, Marie-Cécile, Osaka, H, Ounap, K, Pinard, J M, Quijano-Roy, S, Poggenburg, I, Poplawski, N, Abdul-Rahman, O, Ribes, A, Arias, A, Yaplito-Lee, J, Schulze, A, Schwartz, C E, Schwenger, S, Soares, G, Sznajer, Yves, Valayannopoulos, V, Van Esch, H, Waltz, S, Wamelink, M M C, Pouwels, P J W, Errami, A, van der Knaap, M S, Jakobs, C, Mancini, G M, and Salomons, G S

Abstract

BACKGROUND: Creatine transporter deficiency is a monogenic cause of X-linked intellectual disability. Since its first description in 2001 several case reports have been published but an overview of phenotype, genotype and phenotype--genotype correlation has been lacking. METHODS: We performed a retrospective study of clinical, biochemical and molecular genetic data of 101 males with X-linked creatine transporter deficiency from 85 families with a pathogenic mutation in the creatine transporter gene (SLC6A8). RESULTS AND CONCLUSIONS: Most patients developed moderate to severe intellectual disability; mild intellectual disability was rare in adult patients. Speech language development was especially delayed but almost a third of the patients were able to speak in sentences. Besides behavioural problems and seizures, mild to moderate motor dysfunction, including extrapyramidal movement abnormalities, and gastrointestinal problems were frequent clinical features. Urinary creatine to creatinine ratio proved to be a reliable screening method besides MR spectroscopy, molecular genetic testing and creatine uptake studies, allowing definition of diagnostic guidelines. A third of patients had a de novo mutation in the SLC6A8 gene. Mothers with an affected son with a de novo mutation should be counselled about a recurrence risk in further pregnancies due to the possibility of low level somatic or germline mosaicism. Missense mutations with residual activity might be associated with a milder phenotype and large deletions extending beyond the 3' end of the SLC6A8 gene with a more severe phenotype. Evaluation of the biochemical phenotype revealed unexpected high creatine levels in cerebrospinal fluid suggesting that the brain is able to synthesise creatine and that the cerebral creatine deficiency is caused by a defect in the reuptake of creatine within the neurones.

Published
2013

6. Phenotype and genotype in 101 males with x-linked creatine transporter deficiency

Author

van de Kamp, J.M. (Jiddeke M.), Betsalel, O.T. (Ofir), Mercimek-Mahmutoglu, S. (Saadet), Abulhoul, L. (L.), Grünewald, S. (Sonja), Anselm, I. (I.), Azzouz, H. (H.), Bratkovic, D. (D.), Brouwer, A.P.M. (Arjan) de, Hamel, B.C. (Ben), Kleefstra, T. (Tjitske), Yntema, H.G., Campistol, J.M., Vilaseca, M.A. (M.), Cheillan, D. (David), D'Hooghe, M. (M.), Diogo, L. (Luisa), Garcia, P. (Paula), Valongo, C. (C.), Fonseca, M. (M.), Frints, S.G.M. (Suzanna), Wilcken, B. (Bridget), Haar, S. (Sigrun) von der, Meijers-Heijboer, E.J. (Hanne), Hofstede, F.C. (Floris), Johnson, D. (David), Kant, S.G. (Sarina), Lion-Francois, L. (Laurence), Pitelet, G. (G.), Longo, N. (N.), Maat-Kievit, A.A. (Anneke), Monteiro, J.P. (J.), Munnich, A. (Arnold), Muntau, A.C. (A.), Nassogne, M.C. (M.), Osaka, H. (H.), Õunap, K. (Katrin), Pinard, J.M. (J.), Quijano-Roy, S. (S.), Poggenburg, I. (I.), Poplawski, N. (Nicola), Abdul-Rahman, O.A. (Omar), Ribes, A. (A.), Arias Pérez, J.I. (José Ignacio), Yaplito-Lee, J. (J.), Schulze, A. (A.), Schwartz, C.E., Schwenger, S. (S.), Soares, G. (G.), Sznajer, Y. (Yves), Valayannopoulos, V. (Vassili), Esch, H. (Hilde) van, Waltz, S. (S.), Wamelink, M.M.C. (Mirjam), Pouwels, P.J.W. (Petra), Errami, A. (Abdellatif), Knaap, M.S. (Marjo) van der, Jakobs, C. (Cornelis), Mancini, G.M.S. (Grazia), Salomons, G.S. (Gajja), van de Kamp, J.M. (Jiddeke M.), Betsalel, O.T. (Ofir), Mercimek-Mahmutoglu, S. (Saadet), Abulhoul, L. (L.), Grünewald, S. (Sonja), Anselm, I. (I.), Azzouz, H. (H.), Bratkovic, D. (D.), Brouwer, A.P.M. (Arjan) de, Hamel, B.C. (Ben), Kleefstra, T. (Tjitske), Yntema, H.G., Campistol, J.M., Vilaseca, M.A. (M.), Cheillan, D. (David), D'Hooghe, M. (M.), Diogo, L. (Luisa), Garcia, P. (Paula), Valongo, C. (C.), Fonseca, M. (M.), Frints, S.G.M. (Suzanna), Wilcken, B. (Bridget), Haar, S. (Sigrun) von der, Meijers-Heijboer, E.J. (Hanne), Hofstede, F.C. (Floris), Johnson, D. (David), Kant, S.G. (Sarina), Lion-Francois, L. (Laurence), Pitelet, G. (G.), Longo, N. (N.), Maat-Kievit, A.A. (Anneke), Monteiro, J.P. (J.), Munnich, A. (Arnold), Muntau, A.C. (A.), Nassogne, M.C. (M.), Osaka, H. (H.), Õunap, K. (Katrin), Pinard, J.M. (J.), Quijano-Roy, S. (S.), Poggenburg, I. (I.), Poplawski, N. (Nicola), Abdul-Rahman, O.A. (Omar), Ribes, A. (A.), Arias Pérez, J.I. (José Ignacio), Yaplito-Lee, J. (J.), Schulze, A. (A.), Schwartz, C.E., Schwenger, S. (S.), Soares, G. (G.), Sznajer, Y. (Yves), Valayannopoulos, V. (Vassili), Esch, H. (Hilde) van, Waltz, S. (S.), Wamelink, M.M.C. (Mirjam), Pouwels, P.J.W. (Petra), Errami, A. (Abdellatif), Knaap, M.S. (Marjo) van der, Jakobs, C. (Cornelis), Mancini, G.M.S. (Grazia), and Salomons, G.S. (Gajja)

Abstract

Background: Creatine transporter deficiency is a monogenic cause of X-linked intellectual disability. Since its first description in 2001 several case reports have been published but an overview of phenotype, genotype and phenotype-genotype correlation has been lacking. Methods: We performed a retrospective study of clinical, biochemical and molecular genetic data of 101 males with X-linked creatine transporter deficiency from 85 families with a pathogenic mutation in the creatine transporter gene (SLC6A8). Results and conclusions: Most patients developed moderate to severe intellectual disability; mild intellectual disability was rare in adult patients. Speech language development was especially delayed but almost a third of the patients were able to speak in sentences. Besides behavioural problems and seizures, mild to moderate motor dysfunction, including extrapyramidal movement abnormalities, and gastrointestinal problems were frequent clinical features. Urinary creatine to creatinine ratio proved to be a reliable screening method besides MR spectroscopy, molecular genetic testing and creatine uptake studies, allowing definition of diagnostic guidelines. A third of patients had a de novo mutation in the SLC6A8 gene. Mothers with an affected son with a de novo mutation should be counselled about a recurrence risk in further pregnancies due to the possibility of low level somatic or germline mosaicism. Missense mutations with residual activity might be associated with a milder phenotype and large deletions extending beyond the 30 end of the SLC6A8 gene with a more severe phenotype. Evaluation of the biochemical phenotype revealed unexpected high creatine levels in cerebrospinal fluid suggesting that the brain is able to synthesise creatine and that the cerebral creatine deficiency is caused by a defect in the reuptake of creatine within the neurones.

Published
2013
Full Text
View/download PDF

7. Phenotype and genotype in 101 males with X-linked creatine transporter deficiency

Author

Kamp, J.M. van de, Betsalel, O.T., Mercimek-Mahmutoglu, S., Abulhoul, L., Grunewald, S., Anselm, I., Azzouz, H., Bratkovic, D., Brouwer, A., Hamel, B.C.J., Kleefstra, T., Yntema, H.G., Campistol, J., Vilaseca, M.A., Cheillan, D., D'Hooghe, M., Diogo, L., Garcia, P., Valongo, C., Fonseca, M., Frints, S., Wilcken, B., Haar, S. van der, Meijers-Heijboer, H.E., Hofstede, F., Johnson, D., Kant, S.G., Lion-Francois, L., Pitelet, G., Longo, N., Maat-Kievit, J.A., Monteiro, J.P., Munnich, A., Muntau, A.C., Nassogne, M.C., Osaka, H., Ounap, K., Pinard, J.M., Quijano-Roy, S., Poggenburg, I., Poplawski, N., Abdul-Rahman, O., Ribes, A., Arias Vasquez, A., Yaplito-Lee, J., Schulze, A., Schwartz, C.E., Schwenger, S., Soares, G., Sznajer, Y., Valayannopoulos, V., Esch, H. van, Waltz, S., Wamelink, M.M., Pouwels, P.J., Errami, A., Knaap, M.S. van der, Jakobs, C., Mancini, G.M.S., Salomons, G.S., Kamp, J.M. van de, Betsalel, O.T., Mercimek-Mahmutoglu, S., Abulhoul, L., Grunewald, S., Anselm, I., Azzouz, H., Bratkovic, D., Brouwer, A., Hamel, B.C.J., Kleefstra, T., Yntema, H.G., Campistol, J., Vilaseca, M.A., Cheillan, D., D'Hooghe, M., Diogo, L., Garcia, P., Valongo, C., Fonseca, M., Frints, S., Wilcken, B., Haar, S. van der, Meijers-Heijboer, H.E., Hofstede, F., Johnson, D., Kant, S.G., Lion-Francois, L., Pitelet, G., Longo, N., Maat-Kievit, J.A., Monteiro, J.P., Munnich, A., Muntau, A.C., Nassogne, M.C., Osaka, H., Ounap, K., Pinard, J.M., Quijano-Roy, S., Poggenburg, I., Poplawski, N., Abdul-Rahman, O., Ribes, A., Arias Vasquez, A., Yaplito-Lee, J., Schulze, A., Schwartz, C.E., Schwenger, S., Soares, G., Sznajer, Y., Valayannopoulos, V., Esch, H. van, Waltz, S., Wamelink, M.M., Pouwels, P.J., Errami, A., Knaap, M.S. van der, Jakobs, C., Mancini, G.M.S., and Salomons, G.S.

Abstract

Item does not contain fulltext, BACKGROUND: Creatine transporter deficiency is a monogenic cause of X-linked intellectual disability. Since its first description in 2001 several case reports have been published but an overview of phenotype, genotype and phenotype-genotype correlation has been lacking. METHODS: We performed a retrospective study of clinical, biochemical and molecular genetic data of 101 males with X-linked creatine transporter deficiency from 85 families with a pathogenic mutation in the creatine transporter gene (SLC6A8). RESULTS AND CONCLUSIONS: Most patients developed moderate to severe intellectual disability; mild intellectual disability was rare in adult patients. Speech language development was especially delayed but almost a third of the patients were able to speak in sentences. Besides behavioural problems and seizures, mild to moderate motor dysfunction, including extrapyramidal movement abnormalities, and gastrointestinal problems were frequent clinical features. Urinary creatine to creatinine ratio proved to be a reliable screening method besides MR spectroscopy, molecular genetic testing and creatine uptake studies, allowing definition of diagnostic guidelines. A third of patients had a de novo mutation in the SLC6A8 gene. Mothers with an affected son with a de novo mutation should be counselled about a recurrence risk in further pregnancies due to the possibility of low level somatic or germline mosaicism. Missense mutations with residual activity might be associated with a milder phenotype and large deletions extending beyond the 3' end of the SLC6A8 gene with a more severe phenotype. Evaluation of the biochemical phenotype revealed unexpected high creatine levels in cerebrospinal fluid suggesting that the brain is able to synthesise creatine and that the cerebral creatine deficiency is caused by a defect in the reuptake of creatine within the neurones.

Published
2013

8. Phenotype and genotype in 101 males with X-linked creatine transporter deficiency

Author

Kamp, J.M. van de, Betsalel, O.T., Mercimek-Mahmutoglu, S., Abulhoul, L., Grunewald, S., Anselm, I., Azzouz, H., Bratkovic, D., Brouwer, A.P.M. de, Hamel, B.C.J., Kleefstra, T., Yntema, H.G., Campistol, J., Vilaseca, M.A., Cheillan, D., D'Hooghe, M., Diogo, L., Garcia, P., Valongo, C., Fonseca, M., Frints, S., Wilcken, B., Haar, S. van der, Meijers-Heijboer, H.E., Hofstede, F., Johnson, D., Kant, S.G., Lion-Francois, L., Pitelet, G., Longo, N., Maat-Kievit, J.A., Monteiro, J.P., Munnich, A., Muntau, A.C., Nassogne, M.C., Osaka, H., Ounap, K., Pinard, J.M., Quijano-Roy, S., Poggenburg, I., Poplawski, N., Abdul-Rahman, O., Ribes, A., Arias Vasquez, A., Yaplito-Lee, J., Schulze, A., Schwartz, C.E., Schwenger, S., Soares, G., Sznajer, Y., Valayannopoulos, V., Esch, H. van, Waltz, S., Wamelink, M.M., Pouwels, P.J., Errami, A., Knaap, M.S. van der, Jakobs, C., Mancini, G.M.S., Salomons, G.S., Kamp, J.M. van de, Betsalel, O.T., Mercimek-Mahmutoglu, S., Abulhoul, L., Grunewald, S., Anselm, I., Azzouz, H., Bratkovic, D., Brouwer, A.P.M. de, Hamel, B.C.J., Kleefstra, T., Yntema, H.G., Campistol, J., Vilaseca, M.A., Cheillan, D., D'Hooghe, M., Diogo, L., Garcia, P., Valongo, C., Fonseca, M., Frints, S., Wilcken, B., Haar, S. van der, Meijers-Heijboer, H.E., Hofstede, F., Johnson, D., Kant, S.G., Lion-Francois, L., Pitelet, G., Longo, N., Maat-Kievit, J.A., Monteiro, J.P., Munnich, A., Muntau, A.C., Nassogne, M.C., Osaka, H., Ounap, K., Pinard, J.M., Quijano-Roy, S., Poggenburg, I., Poplawski, N., Abdul-Rahman, O., Ribes, A., Arias Vasquez, A., Yaplito-Lee, J., Schulze, A., Schwartz, C.E., Schwenger, S., Soares, G., Sznajer, Y., Valayannopoulos, V., Esch, H. van, Waltz, S., Wamelink, M.M., Pouwels, P.J., Errami, A., Knaap, M.S. van der, Jakobs, C., Mancini, G.M.S., and Salomons, G.S.

Abstract

Item does not contain fulltext, BACKGROUND: Creatine transporter deficiency is a monogenic cause of X-linked intellectual disability. Since its first description in 2001 several case reports have been published but an overview of phenotype, genotype and phenotype-genotype correlation has been lacking. METHODS: We performed a retrospective study of clinical, biochemical and molecular genetic data of 101 males with X-linked creatine transporter deficiency from 85 families with a pathogenic mutation in the creatine transporter gene (SLC6A8). RESULTS AND CONCLUSIONS: Most patients developed moderate to severe intellectual disability; mild intellectual disability was rare in adult patients. Speech language development was especially delayed but almost a third of the patients were able to speak in sentences. Besides behavioural problems and seizures, mild to moderate motor dysfunction, including extrapyramidal movement abnormalities, and gastrointestinal problems were frequent clinical features. Urinary creatine to creatinine ratio proved to be a reliable screening method besides MR spectroscopy, molecular genetic testing and creatine uptake studies, allowing definition of diagnostic guidelines. A third of patients had a de novo mutation in the SLC6A8 gene. Mothers with an affected son with a de novo mutation should be counselled about a recurrence risk in further pregnancies due to the possibility of low level somatic or germline mosaicism. Missense mutations with residual activity might be associated with a milder phenotype and large deletions extending beyond the 3' end of the SLC6A8 gene with a more severe phenotype. Evaluation of the biochemical phenotype revealed unexpected high creatine levels in cerebrospinal fluid suggesting that the brain is able to synthesise creatine and that the cerebral creatine deficiency is caused by a defect in the reuptake of creatine within the neurones.

Published
2013

Catalog

Books, media, physical & digital resources
See catalog results