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Your search keyword '"Elbendary, H.M."' showing total 6 results
Start Over Author "Elbendary, H.M." Publication Year Range Last 10 years
6 results on '"Elbendary, H.M."'

2. In-depth characterization of neuroradiological findings in a large sample of individuals with autism spectrum disorder and controls

Author

Ambrosino, S., Elbendary, H.M., Lequin, M., Rijkelijkhuizen, Dominique, Banaschewski, Tobias, Baron-Cohen, S., Buitelaar, J.K., Moessnang, C., Murphy, Declan, Durston, Sarah, Ambrosino, S., Elbendary, H.M., Lequin, M., Rijkelijkhuizen, Dominique, Banaschewski, Tobias, Baron-Cohen, S., Buitelaar, J.K., Moessnang, C., Murphy, Declan, and Durston, Sarah

Abstract

Contains fulltext : 253164.pdf (Publisher’s version ) (Open Access)

Published
2022

3. Clinico-radiological features, molecular spectrum, and identification of prognostic factors in developmental and epileptic encephalopathy due to inosine triphosphate pyrophosphatase (ITPase) deficiency

Author

Scala, M., Wortmann, S.B., Kaya, N., Stellingwerff, M.D., Pistorio, A., Glamuzina, E., Karnebeek, C.D. van, Skrypnyk, C., Iwanicka-Pronicka, K., Piekutowska-Abramczuk, D., Ciara, E., Tort, F., Sheidley, B., Poduri, A., Jayakar, P., Jayakar, A., Upadia, J., Walano, N., Haack, T.B., Prokisch, H., Aldhalaan, H., Karimiani, E.G., Yildiz, Y., Ceylan, A.C., Santiago-Sim, T., Dameron, A., Yang, H., Toosi, M.B., Ashrafzadeh, F., Akhondian, J., Imannezhad, S., Mirzadeh, H.S., Maqbool, S., Farid, A., Al-Muhaizea, M.A., Alshwameen, M.O., Aldowsari, L., Alsagob, M., Alyousef, A., Almass, R., AlHargan, A., Alwadei, A.H., AlRasheed, M.M., Colak, D., Alqudairy, H., Khan, S., Lines, M.A., Cazorla, M., Ribes, A., Morava, E., Bibi, F., Haider, S., Ferla, M.P., Taylor, J.C., Alsaif, H.S., Firdous, A., Hashem, M., Shashkin, C., Koneev, K., Kaiyrzhanov, R., Efthymiou, S., Genomics, Q.S., Schmitt-Mechelke, T., Ziegler, A., Issa, M.Y., Elbendary, H.M., Striano, P., Alkuraya, F.S., Zaki, M.S., Gleeson, J.G., Barakat, T.S., Bierau, J., Knaap, M.S. van der, Maroofian, R., Houlden, H., Scala, M., Wortmann, S.B., Kaya, N., Stellingwerff, M.D., Pistorio, A., Glamuzina, E., Karnebeek, C.D. van, Skrypnyk, C., Iwanicka-Pronicka, K., Piekutowska-Abramczuk, D., Ciara, E., Tort, F., Sheidley, B., Poduri, A., Jayakar, P., Jayakar, A., Upadia, J., Walano, N., Haack, T.B., Prokisch, H., Aldhalaan, H., Karimiani, E.G., Yildiz, Y., Ceylan, A.C., Santiago-Sim, T., Dameron, A., Yang, H., Toosi, M.B., Ashrafzadeh, F., Akhondian, J., Imannezhad, S., Mirzadeh, H.S., Maqbool, S., Farid, A., Al-Muhaizea, M.A., Alshwameen, M.O., Aldowsari, L., Alsagob, M., Alyousef, A., Almass, R., AlHargan, A., Alwadei, A.H., AlRasheed, M.M., Colak, D., Alqudairy, H., Khan, S., Lines, M.A., Cazorla, M., Ribes, A., Morava, E., Bibi, F., Haider, S., Ferla, M.P., Taylor, J.C., Alsaif, H.S., Firdous, A., Hashem, M., Shashkin, C., Koneev, K., Kaiyrzhanov, R., Efthymiou, S., Genomics, Q.S., Schmitt-Mechelke, T., Ziegler, A., Issa, M.Y., Elbendary, H.M., Striano, P., Alkuraya, F.S., Zaki, M.S., Gleeson, J.G., Barakat, T.S., Bierau, J., Knaap, M.S. van der, Maroofian, R., and Houlden, H.

Abstract

Contains fulltext : 283128.pdf (Publisher’s version ) (Open Access), Developmental and epileptic encephalopathy 35 (DEE 35) is a severe neurological condition caused by biallelic variants in ITPA, encoding inosine triphosphate pyrophosphatase, an essential enzyme in purine metabolism. We delineate the genotypic and phenotypic spectrum of DEE 35, analyzing possible predictors for adverse clinical outcomes. We investigated a cohort of 28 new patients and reviewed previously described cases, providing a comprehensive characterization of 40 subjects. Exome sequencing was performed to identify underlying ITPA pathogenic variants. Brain MRI (magnetic resonance imaging) scans were systematically analyzed to delineate the neuroradiological spectrum. Survival curves according to the Kaplan-Meier method and log-rank test were used to investigate outcome predictors in different subgroups of patients. We identified 18 distinct ITPA pathogenic variants, including 14 novel variants, and two deletions. All subjects showed profound developmental delay, microcephaly, and refractory epilepsy followed by neurodevelopmental regression. Brain MRI revision revealed a recurrent pattern of delayed myelination and restricted diffusion of early myelinating structures. Congenital microcephaly and cardiac involvement were statistically significant novel clinical predictors of adverse outcomes. We refined the molecular, clinical, and neuroradiological characterization of ITPase deficiency, and identified new clinical predictors which may have a potentially important impact on diagnosis, counseling, and follow-up of affected individuals.

Published
2022

4. Biallelic loss of function variants in SYT2 cause a treatable congenital onset presynaptic myasthenic syndrome

Author

Donkervoort, S., Mohassel, P., Laugwitz, L., Zaki, M.S., Kamsteeg, E.J., Maroofian, R., Chao, K.R., Verschuuren-Bemelmans, C.C., Horber, V., Fock, A.J.M., McCarty, R.M., Jain, M.S., Biancavilla, V., McMacken, G., Nalls, M., Voermans, N.C., Elbendary, H.M., Snyder, M., Cai, C., Lehky, T.J., Stanley, V., Iannaccone, S.T., Foley, A.R., Lochmüller, H., Gleeson, J., Houlden, H., Haack, T.B., Horvath, R., Bönnemann, C.G., Donkervoort, S., Mohassel, P., Laugwitz, L., Zaki, M.S., Kamsteeg, E.J., Maroofian, R., Chao, K.R., Verschuuren-Bemelmans, C.C., Horber, V., Fock, A.J.M., McCarty, R.M., Jain, M.S., Biancavilla, V., McMacken, G., Nalls, M., Voermans, N.C., Elbendary, H.M., Snyder, M., Cai, C., Lehky, T.J., Stanley, V., Iannaccone, S.T., Foley, A.R., Lochmüller, H., Gleeson, J., Houlden, H., Haack, T.B., Horvath, R., and Bönnemann, C.G.

Abstract

Contains fulltext : 229372.pdf (Publisher’s version ) (Closed access), Synaptotagmins are integral synaptic vesicle membrane proteins that function as calcium sensors and regulate neurotransmitter release at the presynaptic nerve terminal. Synaptotagmin-2 (SYT2), is the major isoform expressed at the neuromuscular junction. Recently, dominant missense variants in SYT2 have been reported as a rare cause of distal motor neuropathy and myasthenic syndrome, manifesting with stable or slowly progressive distal weakness of variable severity along with presynaptic NMJ impairment. These variants are thought to have a dominant-negative effect on synaptic vesicle exocytosis, although the precise pathomechanism remains to be elucidated. Here we report seven patients of five families, with biallelic loss of function variants in SYT2, clinically manifesting with a remarkably consistent phenotype of severe congenital onset hypotonia and weakness, with variable degrees of respiratory involvement. Electrodiagnostic findings were consistent with a presynaptic congenital myasthenic syndrome (CMS) in some. Treatment with an acetylcholinesterase inhibitor pursued in three patients showed clinical improvement with increased strength and function. This series further establishes SYT2 as a CMS-disease gene and expands its clinical and genetic spectrum to include recessive loss-of-function variants, manifesting as a severe congenital onset presynaptic CMS with potential treatment implications.

Published
2020

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