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382 results on '"Bakhtiari, S."'

1. Standoff Through-the-Wall Sensing at Ka-Band Microwave

Author

Liao, S., Elmer, T., Bakhtiari, S., Gopalsami, N., Cox, N., Wiencek, J., and Raptis, A. C.

Subjects
Electrical Engineering and Systems Science - Systems and Control, Physics - Applied Physics
Abstract

Conventional microwave remote sensing/imaging of through-the-wall objects made of different materials is usually performed at frequencies below 3 GHz that provide relatively low spatial resolution. In this paper, we evaluate the ability and sensitivity of high-frequency microwave or millimeter wave standoff sensing of through-the-wall objects to achieve high spatial resolution. The target under study is a sandwich structure consisting of different object materials placed between two wall blocks. An Agilent PNA-X series (model N5245A) vector network analyzer is used to sweep over the entire Ka-band (26.5 GHz to 40 GHz). The beam is then directed to a standard rectangular horn antenna and collimated by a 6-inch-diameter Gaussian lens towards the sandwich structure (wall block/object/wall block). The reflected electromagnetic wave is picked up by the same system as the complex S-parameter S11. Both amplitude and phase of the reflected signal are used to recognize different materials sandwiched between the cement blocks. The experimental results are compared with the theoretical calculations, which show satisfactory agreement for the cases evaluated in this work., Comment: 15 pages, 7 figures, more references added to a paper to Materials Evaluation

Published
2020

2. Ultrasonic and Electromagnetic Sensors for Downhole Reservoir Characterization

Author

Wang, K., Chien, H. T., Liao, S., Yuan, L. P., Sheen, S. H., Bakhtiari, S., and Raptis, A. C.

Subjects
Physics - Applied Physics, Electrical Engineering and Systems Science - Systems and Control
Abstract

The current work covers the evaluation of ultrasonic and electromagnetic (EM) techniques applied to temperature measurement and flow characterization for Enhanced Geothermal System (EGS). We have evaluated both ultrasonic techniques and microwave radiometry for temperature gradient and profile measurements. A waveguide-based ultrasonic probe was developed to measure the temperature gradient. A statistic approach on estimating the average grain size via spectral analysis of the scattered ultrasonic signals is introduced. For directional temperature measurement, different microwave antenna designs are compared numerically and an array loop antenna design is selected for further development. Finally techniques to characterize the porosity and permeability of a hot dry rock resource are presented., Comment: 7 pages, 5 figures

Published
2020

3. Millimeter Wave Doppler Sensor for Nondestructive Evaluation of Materials

Author

Liao, S., Bakhtiari, S., Elmer, T., Lawrence, B., Koehl, E. R., Gopalsami, N., and Raptis, A.

Subjects
Physics - Applied Physics, Electrical Engineering and Systems Science - Systems and Control
Abstract

Resonance modes are intrinsic characteristics of objects when excited at those frequencies. Probing the resonance signatures can reveal useful information about material composition, geometry, presence of defects, and other characteristics of the object under test. Vibration spectra can be measured remotely with high degree of sensitivity using a millimeter wave (mmW) Doppler sensor and a remote excitation source. This novel nondestructive evaluation (NDE) method can work in a non-contact manner as an alternative or complementary approach to conventional NDE methods such as those based on acoustic/ultrasonic and optical techniques. Millimeter wave vibrometry can be used for a wide range of civil and national security applications. Examples include detection of defects and degradation for diagnostics and prognostics of materials components and rapid standoff inspection of shielded/sealed containers for contraband. In this paper, we evaluate the performance of a compact mmW vibrometer developed at Argonne. Our 94 GHz I-Q Doppler sensor monitors the mechanical vibration signature of the object under interrogation that is induced by continuous wave excitation. For proof-of-principle demonstrations, the test objects were mechanically excited by an electronically controlled shaker using sinusoidal waves at various frequencies ranging from DC to 200 Hz. We will present a number of laboratory test results and will discuss the method's applicability to some practical NDE applications., Comment: 10 pages, 10 figures

Published
2020

4. Perspective and Experience of Hospital Operating Room Nurses with the Concept of Excellence: A Qualitative Study

Author

Bakhtiari S, Sharif F, Shahriari M, and Rakhshan M

Subjects
excellence, professional values, nursing, operating room, positive psychology, content analysis, qualitative research, Public aspects of medicine, RA1-1270
Abstract

Soheila Bakhtiari,1,2 Farkhondeh Sharif,3 Mohsen Shahriari,4 Mahnaz Rakhshan5 1Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran; 2Operating Room Department, School of Nursing and Midwifery, Nursing and Midwifery Care Research Center, Isfahan University of Medical Sciences, Isfahan, Iran; 3Community Based Psychiatric Care Research Center, School of Nursing and Midwifery, Shiraz University of Medical Sciences, Shiraz, Iran; 4Department of Adult Health Nursing, School of Nursing and Midwifery, Nursing and Midwifery Care Research Center, Isfahan University of Medical Sciences, Isfahan, Iran; 5Community Based Psychiatric Care Research Center, School of Nursing and Midwifery, Shiraz University of Medical Sciences, Shiraz, IranCorrespondence: Mahnaz RakhshanCommunity Based Psychiatric Care Research Center, School of Nursing and Midwifery, Shiraz University of Medical Sciences, Shiraz, IranEmail mahnazrakhshan@yahoo.comIntroduction: The provision of care according to the code of ethics is of the highest priority in operating rooms (OR). However, the exposure of the surgical team to a high level of stress may result in unethical behavior and undermine their pursuit of excellence. Since the concept of excellence is complex and there are limited published studies in the nursing literature, there was a need for in-depth research.Objective: The present study aimed at evaluating the perspective and experience of OR nurses with the concept of excellence.Study Design: The conventional qualitative content analysis method was employed to explore the concept of excellence among OR nurses.Participants and Research Environment: The current study was conducted on 20 OR nurses in the elective and emergency operating rooms of hospitals affiliated to Isfahan University of Medical Sciences, Isfahan, Iran. The data were collected through in-depth semi-structured face-to-face interviews and field notes from April 2017 to June 2018.Findings: The four categories extracted from the interview data were “enhanced personality traits”, “growth and development”, “knowledge enhancement”, and “effective teamwork”. In addition, a total of 10 sub-categories were extracted.Discussion: The findings of the present study indicated that OR nurses can achieve personal, professional, organizational, and social excellence through enhancing personality traits, peer learning, teaching ethics to the surgical team members, and educating and training patients and family caregivers through effective teamwork. A close collaboration between OR nurses and nursing managers would develop a culture of pursuit for excellence.Conclusion: The findings of the present study provided a better understanding of the perception of OR nurses with the concept of excellence; based on which, optimal ethical care and an environment for the pursuit of excellence can be developed. The findings also provided evidence-based recommendations to nursing managers on how to gain the trust of patients and family caregivers, and promote the pursuit of personal, professional, organizational, and social excellence.Keywords: excellence, professional values, nursing, operating room, positive psychology, content analysis, qualitative research

Published
2020

13. Expanding SNX14-Associated Movement Disorders in a Genotype–Phenotype Spectrum.

Author

Toepffer, E. M., Ojeda, N. Meave, Bakhtiari, S., Efthymiou, S., Horvath, R., Lochmüller, H., Zaki, M. S., Azam, M., Ben-Omran, T., Karagoz, I., Kaiyrzhanov, R., Guliyeva, U., Gulieva, S., Salayev, K., Hiz, S., Hiatt, S. M., Kunstmann, E., Miryounesi, M., Hashemi-Gorji, F., and Cooper, G. M.

Subjects
MOVEMENT disorders, GENETIC counseling, SKELETAL abnormalities, PATIENTS' families, DIAGNOSTIC imaging, ATAXIA
Abstract

This article, published in the journal Neuropediatrics, explores the genotype-phenotype spectrum of SNX14-associated movement disorders. SNX14 is a protein involved in vesicular tethering and trafficking in cells. The study collected clinical and imaging data from 62 patients with biallelic SNX14 variants, including 22 previously unreported cases. The findings reveal a wide clinical spectrum of symptoms, including ataxia, global neurodevelopmental delay, and skeletal abnormalities. The study also identifies novel phenotypes with movement disorders and provides important information for genetic counseling and support for patients and families. [Extracted from the article]

Published
2023
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16. List of contributors

Author

Bahn, C.B., primary, Bakhtiari, S., additional, Carroll, L.B., additional, de Curieres, I., additional, Drexler, A., additional, Gorman, J.A., additional, Hassan, M., additional, Huang, M., additional, Khumsa-Ang, K., additional, Kreider, M., additional, Laroche, S., additional, Majumdar, S., additional, McKay, A., additional, Murphy, E.L., additional, Obrutsky, L., additional, Papp, L., additional, Riznic, J., additional, Smith, J.C., additional, Sollier, T., additional, Turner, C.W., additional, Vacek, J., additional, Varrin, Robert D., additional, White, G., additional, and Zeng, Z., additional

Published
2017
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17. Variants in Mitochondrial ATP Synthase Cause Variable Neurologic Phenotypes

Author

Zech, M., Kopajtich, R., Steinbrücker, K., Bris, C., Gueguen, N., Feichtinger, R.G., Achleitner, M.T., Duzkale, N., Périvier, M., Koch, J., Engelhardt, H., Freisinger, P., Wagner, M., Brunet, T., Berutti, R., Smirnov, D., Navaratnarajah, T., Rodenburg, R.J.T., Pais, L.S., Austin-Tse, C., O'Leary, M., Boesch, S., Jech, R., Bakhtiari, S., Jin, S.C., Wilbert, F., Kruer, M.C., Wortmann, S.B., Eckenweiler, M., Mayr, J.A., Distelmaier, F., Steinfeld, R., Winkelmann, J., Prokisch, H., Zech, M., Kopajtich, R., Steinbrücker, K., Bris, C., Gueguen, N., Feichtinger, R.G., Achleitner, M.T., Duzkale, N., Périvier, M., Koch, J., Engelhardt, H., Freisinger, P., Wagner, M., Brunet, T., Berutti, R., Smirnov, D., Navaratnarajah, T., Rodenburg, R.J.T., Pais, L.S., Austin-Tse, C., O'Leary, M., Boesch, S., Jech, R., Bakhtiari, S., Jin, S.C., Wilbert, F., Kruer, M.C., Wortmann, S.B., Eckenweiler, M., Mayr, J.A., Distelmaier, F., Steinfeld, R., Winkelmann, J., and Prokisch, H.

Abstract

Item does not contain fulltext, OBJECTIVE: ATP synthase (ATPase) is responsible for the majority of ATP production. Nevertheless, disease phenotypes associated with mutations in ATPase subunits are extremely rare. We aimed at expanding the spectrum of ATPase-related diseases. METHODS: Whole-exome sequencing in cohorts with 2,962 patients diagnosed with mitochondrial disease and/or dystonia and international collaboration were used to identify deleterious variants in ATPase-encoding genes. Findings were complemented by transcriptional and proteomic profiling of patient fibroblasts. ATPase integrity and activity were assayed using cells and tissues from 5 patients. RESULTS: We present 10 total individuals with biallelic or de novo monoallelic variants in nuclear ATPase subunit genes. Three unrelated patients showed the same homozygous missense ATP5F1E mutation (including one published case). An intronic splice-disrupting alteration in compound heterozygosity with a nonsense variant in ATP5PO was found in one patient. Three patients had de novo heterozygous missense variants in ATP5F1A, whereas another 3 were heterozygous for ATP5MC3 de novo missense changes. Bioinformatics methods and populational data supported the variants' pathogenicity. Immunohistochemistry, proteomics, and/or immunoblotting revealed significantly reduced ATPase amounts in association to ATP5F1E and ATP5PO mutations. Diminished activity and/or defective assembly of ATPase was demonstrated by enzymatic assays and/or immunoblotting in patient samples bearing ATP5F1A-p.Arg207His, ATP5MC3-p.Gly79Val, and ATP5MC3-p.Asn106Lys. The associated clinical profiles were heterogeneous, ranging from hypotonia with spontaneous resolution (1/10) to epilepsy with early death (1/10) or variable persistent abnormalities, including movement disorders, developmental delay, intellectual disability, hyperlactatemia, and other neurologic and systemic features. Although potentially reflecting an ascertainment bias, dystonia was common (7/10). INTERPRETA

Published
2022

18. SLITRK2 variants associated with neurodevelopmental disorders impair excitatory synaptic function and cognition in mice

Author

Chehadeh, Salima El, Han, Kyung Ah, Kim, Dongwook, Jang, Gyubin, Bakhtiari, S., Lim, Dongseok, Brouwer, A.P.M. de, Vulto-van Silfhout, A.T., Piton, A., Um, Ji Won, Chehadeh, Salima El, Han, Kyung Ah, Kim, Dongwook, Jang, Gyubin, Bakhtiari, S., Lim, Dongseok, Brouwer, A.P.M. de, Vulto-van Silfhout, A.T., Piton, A., and Um, Ji Won

Abstract

Contains fulltext : 253358.pdf (Publisher’s version ) (Open Access)

Published
2022

19. Clinical Performance of the Consensus Immunoscore in Colon Cancer in the Asian Population from the Multicenter International SITC Study

Author

Mlecnik, B., Torigoe, T., Bindea, G., Popivanova, B., Xu, M., Fujita, T., Hazama, S., Suzuki, N., Nagano, H., Okuno, K., Hirohashi, Y., Furuhata, T., Takemasa, I., Patel, P., Vora, H., Shah, B., Patel, J.B., Rajvik, K.N., Pandya, S.J., Shukla, S.N., Wang, Yili, Zhang, G., Yoshino, T., Taniguchi, H., Bifulco, C., Lugli, A., Lee, J.J., Zlobec, I., Rau, T.T., Berger, M.D., Nagtegaal, I.D., Vink-Borger, Elisa, Hartmann, A., Geppert, C.I., Kolwelter, J., Merkel, S., Grützmann, R., Eynde, M. Van den, Jouret-Mourin, A., Kartheuser, A., Léonard, D., Remue, C., Wang, J., Bavi, P., Roehrl, M.H.A., Ohashi, P.S., Nguyen, L.T., Han, S., MacGregor, H.L., Hafezi-Bakhtiari, S., Wouters, B.G., Masucci, G.V., Andersson, E., Zavadova, E., Vocka, M., Spacek, J., Petruzelka, L., Konopasek, B., Dundr, P., Skalova, H., Nemejcova, K., Botti, G., Tatangelo, F., Delrio, P., Ciliberto, G., Maio, M, Laghi, L., Grizzi, F., Marliot, F., Fredriksen, T., Buttard, B., Lafontaine, L., Maby, P., Majdi, A., Hijazi, A., Sissy, C. El, Kirilovsky, A., Berger, A., Lagorce, C., Paustian, C., Ballesteros-Merino, C., Dijkstra, J.R., Water, C. van de, Lent-van Vliet, S. van, Knijn, N., Mușină, A.M., Scripcariu, D.V., Marincola, F.M., Ascierto, P.A., Fox, B.A., Pagès, F., Kawakami, Y., Galon, J., Mlecnik, B., Torigoe, T., Bindea, G., Popivanova, B., Xu, M., Fujita, T., Hazama, S., Suzuki, N., Nagano, H., Okuno, K., Hirohashi, Y., Furuhata, T., Takemasa, I., Patel, P., Vora, H., Shah, B., Patel, J.B., Rajvik, K.N., Pandya, S.J., Shukla, S.N., Wang, Yili, Zhang, G., Yoshino, T., Taniguchi, H., Bifulco, C., Lugli, A., Lee, J.J., Zlobec, I., Rau, T.T., Berger, M.D., Nagtegaal, I.D., Vink-Borger, Elisa, Hartmann, A., Geppert, C.I., Kolwelter, J., Merkel, S., Grützmann, R., Eynde, M. Van den, Jouret-Mourin, A., Kartheuser, A., Léonard, D., Remue, C., Wang, J., Bavi, P., Roehrl, M.H.A., Ohashi, P.S., Nguyen, L.T., Han, S., MacGregor, H.L., Hafezi-Bakhtiari, S., Wouters, B.G., Masucci, G.V., Andersson, E., Zavadova, E., Vocka, M., Spacek, J., Petruzelka, L., Konopasek, B., Dundr, P., Skalova, H., Nemejcova, K., Botti, G., Tatangelo, F., Delrio, P., Ciliberto, G., Maio, M, Laghi, L., Grizzi, F., Marliot, F., Fredriksen, T., Buttard, B., Lafontaine, L., Maby, P., Majdi, A., Hijazi, A., Sissy, C. El, Kirilovsky, A., Berger, A., Lagorce, C., Paustian, C., Ballesteros-Merino, C., Dijkstra, J.R., Water, C. van de, Lent-van Vliet, S. van, Knijn, N., Mușină, A.M., Scripcariu, D.V., Marincola, F.M., Ascierto, P.A., Fox, B.A., Pagès, F., Kawakami, Y., and Galon, J.

Abstract

Contains fulltext : 283495.pdf (Publisher’s version ) (Open Access), BACKGROUND: In this study, we evaluated the prognostic value of Immunoscore in patients with stage I-III colon cancer (CC) in the Asian population. These patients were originally included in an international study led by the Society for Immunotherapy of Cancer (SITC) on 2681 patients with AJCC/UICC-TNM stages I-III CC. METHODS: CD3+ and cytotoxic CD8+ T-lymphocyte densities were quantified in the tumor and invasive margin by digital pathology. The association of Immunoscore with prognosis was evaluated for time to recurrence (TTR), disease-free survival (DFS), and overall survival (OS). RESULTS: Immunoscore stratified Asian patients (n = 423) into different risk categories and was not impacted by age. Recurrence-free rates at 3 years were 78.5%, 85.2%, and 98.3% for a Low, Intermediate, and High Immunoscore, respectively (HR[Low-vs-High] = 7.26 (95% CI 1.75-30.19); p = 0.0064). A High Immunoscore showed a significant association with prolonged TTR, OS, and DFS (p < 0.05). In Cox multivariable analysis stratified by center, Immunoscore association with TTR was independent (HR[Low-vs-Int+High] = 2.22 (95% CI 1.10-4.55) p = 0.0269) of the patient's gender, T-stage, N-stage, sidedness, and MSI status. A significant association of a High Immunoscore with prolonged TTR was also found among MSS (HR[Low-vs-Int+High] = 4.58 (95% CI 2.27-9.23); p ≤ 0.0001), stage II (HR[Low-vs-Int+High] = 2.72 (95% CI 1.35-5.51); p = 0.0052), low-risk stage-II (HR[Low-vs-Int+High] = 2.62 (95% CI 1.21-5.68); p = 0.0146), and high-risk stage II patients (HR[Low-vs-Int+High] = 3.11 (95% CI 1.39-6.91); p = 0.0055). CONCLUSION: A High Immunoscore is significantly associated with the prolonged survival of CC patients within the Asian population.

Published
2022

20. Genomic and phenotypic characterization of 404 individuals with neurodevelopmental disorders caused by CTNNB1 variants

Author

Kayumi, S, Perez-Jurado, LA, Palomares, M, Rangu, S, Sheppard, SE, Chung, WK, Kruer, MC, Kharbanda, M, Amor, DJ, McGillivray, G, Cohen, JS, Garcia-Minaur, S, van Eyk, CL, Harper, K, Jolly, LA, Webber, DL, Barnett, CP, Santos-Simarro, F, Pacio-Miguez, M, del Pozo, A, Bakhtiari, S, Deardorff, M, Dubbs, HA, Izumi, K, Grand, K, Gray, C, Mark, PR, Bhoj, EJ, Li, D, Ortiz-Gonzalez, XR, Keena, B, Zackai, EH, Goldberg, EM, de Nanclares, GP, Pereda, A, Llano-Rivas, I, Arroyo, I, Fernandez-Cuesta, MA, Thauvin-Robinet, C, Faivre, L, Garde, A, Mazel, B, Bruel, A-L, Tress, ML, Brilstra, E, Fine, AS, Crompton, KE, Stegmann, APA, Sinnema, M, Stevens, SCJ, Nicolai, J, Lesca, G, Lion-Francois, L, Haye, D, Chatron, N, Piton, A, Nizon, M, Cogne, B, Srivastava, S, Bassetti, J, Muss, C, Gripp, KW, Procopio, RA, Millan, F, Morrow, MM, Assaf, M, Moreno-De-Luca, A, Joss, S, Hamilton, MJ, Bertoli, M, Foulds, N, McKee, S, MacLennan, AH, Gecz, J, Corbett, MA, Kayumi, S, Perez-Jurado, LA, Palomares, M, Rangu, S, Sheppard, SE, Chung, WK, Kruer, MC, Kharbanda, M, Amor, DJ, McGillivray, G, Cohen, JS, Garcia-Minaur, S, van Eyk, CL, Harper, K, Jolly, LA, Webber, DL, Barnett, CP, Santos-Simarro, F, Pacio-Miguez, M, del Pozo, A, Bakhtiari, S, Deardorff, M, Dubbs, HA, Izumi, K, Grand, K, Gray, C, Mark, PR, Bhoj, EJ, Li, D, Ortiz-Gonzalez, XR, Keena, B, Zackai, EH, Goldberg, EM, de Nanclares, GP, Pereda, A, Llano-Rivas, I, Arroyo, I, Fernandez-Cuesta, MA, Thauvin-Robinet, C, Faivre, L, Garde, A, Mazel, B, Bruel, A-L, Tress, ML, Brilstra, E, Fine, AS, Crompton, KE, Stegmann, APA, Sinnema, M, Stevens, SCJ, Nicolai, J, Lesca, G, Lion-Francois, L, Haye, D, Chatron, N, Piton, A, Nizon, M, Cogne, B, Srivastava, S, Bassetti, J, Muss, C, Gripp, KW, Procopio, RA, Millan, F, Morrow, MM, Assaf, M, Moreno-De-Luca, A, Joss, S, Hamilton, MJ, Bertoli, M, Foulds, N, McKee, S, MacLennan, AH, Gecz, J, and Corbett, MA

Abstract

PURPOSE: Germline loss-of-function variants in CTNNB1 cause neurodevelopmental disorder with spastic diplegia and visual defects (NEDSDV; OMIM 615075) and are the most frequent, recurrent monogenic cause of cerebral palsy (CP). We investigated the range of clinical phenotypes owing to disruptions of CTNNB1 to determine the association between NEDSDV and CP. METHODS: Genetic information from 404 individuals with collectively 392 pathogenic CTNNB1 variants were ascertained for the study. From these, detailed phenotypes for 52 previously unpublished individuals were collected and combined with 68 previously published individuals with comparable clinical information. The functional effects of selected CTNNB1 missense variants were assessed using TOPFlash assay. RESULTS: The phenotypes associated with pathogenic CTNNB1 variants were similar. A diagnosis of CP was not significantly associated with any set of traits that defined a specific phenotypic subgroup, indicating that CP is not additional to NEDSDV. Two CTNNB1 missense variants were dominant negative regulators of WNT signaling, highlighting the utility of the TOPFlash assay to functionally assess variants. CONCLUSION: NEDSDV is a clinically homogeneous disorder irrespective of initial clinical diagnoses, including CP, or entry points for genetic testing.

Published
2022

21. SEMA6B variants cause intellectual disability and alter dendritic spine density and axon guidance

Author

Cordovado, A., Schaettin, M., Jeanne, M., Panasenkava, V., Denomme-Pichon, A. -S., Keren, B., Mignot, C., Doco-Fenzy, M., Rodan, L., Ramsey, K., Narayanan, V., Jones, J. R., Prijoles, E. J., Mitchell, W. G., Ozmore, J. R., Juliette, K., Torti, E., Normand, E. A., Granger, L., Petersen, A. K., Au, M. G., Matheny, J. P., Phornphutkul, C., Chambers, M. -K., Fernandez-Ramos, J. -A., Lopez-Laso, E., Kruer, M. C., Bakhtiari, S., Zollino, Marcella, Morleo, M., Marangi, Giuseppe, Mei, D., Pisano, T., Guerrini, R., Louie, R. J., Childers, A., Everman, D. B., Isidor, B., Audebert-Bellanger, S., Odent, S., Bonneau, D., Gilbert-Dussardier, B., Redon, R., Bezieau, S., Laumonnier, F., Stoeckli, E. T., Toutain, A., Vuillaume, M. -L., Zollino M. (ORCID:0000-0003-4871-9519), Marangi G. (ORCID:0000-0002-6898-8882), Cordovado, A., Schaettin, M., Jeanne, M., Panasenkava, V., Denomme-Pichon, A. -S., Keren, B., Mignot, C., Doco-Fenzy, M., Rodan, L., Ramsey, K., Narayanan, V., Jones, J. R., Prijoles, E. J., Mitchell, W. G., Ozmore, J. R., Juliette, K., Torti, E., Normand, E. A., Granger, L., Petersen, A. K., Au, M. G., Matheny, J. P., Phornphutkul, C., Chambers, M. -K., Fernandez-Ramos, J. -A., Lopez-Laso, E., Kruer, M. C., Bakhtiari, S., Zollino, Marcella, Morleo, M., Marangi, Giuseppe, Mei, D., Pisano, T., Guerrini, R., Louie, R. J., Childers, A., Everman, D. B., Isidor, B., Audebert-Bellanger, S., Odent, S., Bonneau, D., Gilbert-Dussardier, B., Redon, R., Bezieau, S., Laumonnier, F., Stoeckli, E. T., Toutain, A., Vuillaume, M. -L., Zollino M. (ORCID:0000-0003-4871-9519), and Marangi G. (ORCID:0000-0002-6898-8882)

Abstract

Intellectual disability (ID) is a neurodevelopmental disorder frequently caused by monogenic defects. In this study, we collected 14 SEMA6B heterozygous variants in 16 unrelated patients referred for ID to different centers. Whereas, until now, SEMA6B variants have mainly been reported in patients with progressive myoclonic epilepsy, our study indicates that the clinical spectrum is wider and also includes non-syndromic ID without epilepsy or myoclonus. To assess the pathogenicity of these variants, selected mutated forms of Sema6b were overexpressed in Human Embryonic Kidney 293T (HEK293T) cells and in primary neuronal cultures. shRNAs targeting Sema6b were also used in neuronal cultures to measure the impact of the decreased Sema6b expression on morphogenesis and synaptogenesis. The overexpression of some variants leads to a subcellular mislocalization of SEMA6B protein in HEK293T cells and to a reduced spine density owing to loss of mature spines in neuronal cultures. Sema6b knockdown also impairs spine density and spine maturation. In addition, we conducted in vivo rescue experiments in chicken embryos with the selected mutated forms of Sema6b expressed in commissural neurons after knockdown of endogenous SEMA6B. We observed that expression of these variants in commissural neurons fails to rescue the normal axon pathway. In conclusion, identification of SEMA6B variants in patients presenting with an overlapping phenotype with ID and functional studies highlight the important role of SEMA6B in neuronal development, notably in spine formation and maturation and in axon guidance. This study adds SEMA6B to the list of ID-related genes.

Published
2022

25. Ultrasonic Link Model Development

Author

Heifetz, A., primary, Ponciroli, R., additional, Huang, X., additional, Wang, Boyang, additional, Saniie, Jafar, additional, Bakhtiari, S., additional, and Vilim, R. B., additional

Published
2018
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28. Keyed hash functions

Author

Bakhtiari, S., Safavi-Naini, R., Pieprzyk, J., Goos, Gerhard, editor, Hartmanis, Juris, editor, van Leeuwen, Jan, editor, Dawson, Ed, editor, and Golić, Jovan, editor

Published
1996
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31. Biallelic variants in HPDL cause pure and complicated hereditary spastic paraplegia

Author

Wiessner, M., Maroofian, R., Ni, M.Y., Pedroni, A., Müller, J.S., Stucka, R., Beetz, C., Efthymiou, S., Santorelli, F.M., Alfares, A.A., Zhu, C., Meszarosova, A. Uhrova, Alehabib, E., Bakhtiari, S., Janecke, A.R., Otero, M.G., Chen, J.Y., Peterson, J.T., Strom, T.M., Jonghe, P. De, Deconinck, T., Ridder, W. De, Winter, J., Pasquariello, R., Ricca, I., Alfadhel, M., Warrenburg, B.P.C. van de, Portier, R., Bergmann, C., Firouzabadi, S. Ghasemi, Jin, S.C., Bilguvar, K., Hamed, S., Abdelhameed, M., Haridy, N.A., Maqbool, S., Rahman, F., Anwar, N., Carmichael, J., Pagnamenta, A., Wood, N.W., Mau-Them, F. Tran, Haack, T., Rocco, M. Di, Ceccherini, I., Iacomino, M., Zara, F., Salpietro, V., Scala, M., Rusmini, M., Xu, Y., Wang, Y., Suzuki, Y., Koh, K., Nan, H., Ishiura, H., Tsuji, S., Lambert, L., Schmitt, E., Lacaze, E., Küpper, H., Dredge, D., Skraban, C., Goldstein, A., Willis, M.J.H., Grand, K., Graham, J.M., Lewis, R.A., Millan, F., Duman, Ö., Dündar, N., Uyanik, G., Schöls, L., Nürnberg, P., Nürnberg, G., Bordes, A. Catala, Seeman, P., Kuchar, M., Darvish, H., Rebelo, A., Bouçanova, F., Medard, J.J., Chrast, R., Auer-Grumbach, M., Alkuraya, F.S., Shamseldin, H., Tala, S. Al, Varaghchi, J. Rezazadeh, Najafi, Maryam, Deschner, S., Gläser, D., Hüttel, W., Kruer, M.C., Kamsteeg, E.J., Takiyama, Y., Züchner, S., Baets, J., Synofzik, M., Schüle, R., Horvath, R., Pierson, T.M., Senderek, J., Wiessner, M., Maroofian, R., Ni, M.Y., Pedroni, A., Müller, J.S., Stucka, R., Beetz, C., Efthymiou, S., Santorelli, F.M., Alfares, A.A., Zhu, C., Meszarosova, A. Uhrova, Alehabib, E., Bakhtiari, S., Janecke, A.R., Otero, M.G., Chen, J.Y., Peterson, J.T., Strom, T.M., Jonghe, P. De, Deconinck, T., Ridder, W. De, Winter, J., Pasquariello, R., Ricca, I., Alfadhel, M., Warrenburg, B.P.C. van de, Portier, R., Bergmann, C., Firouzabadi, S. Ghasemi, Jin, S.C., Bilguvar, K., Hamed, S., Abdelhameed, M., Haridy, N.A., Maqbool, S., Rahman, F., Anwar, N., Carmichael, J., Pagnamenta, A., Wood, N.W., Mau-Them, F. Tran, Haack, T., Rocco, M. Di, Ceccherini, I., Iacomino, M., Zara, F., Salpietro, V., Scala, M., Rusmini, M., Xu, Y., Wang, Y., Suzuki, Y., Koh, K., Nan, H., Ishiura, H., Tsuji, S., Lambert, L., Schmitt, E., Lacaze, E., Küpper, H., Dredge, D., Skraban, C., Goldstein, A., Willis, M.J.H., Grand, K., Graham, J.M., Lewis, R.A., Millan, F., Duman, Ö., Dündar, N., Uyanik, G., Schöls, L., Nürnberg, P., Nürnberg, G., Bordes, A. Catala, Seeman, P., Kuchar, M., Darvish, H., Rebelo, A., Bouçanova, F., Medard, J.J., Chrast, R., Auer-Grumbach, M., Alkuraya, F.S., Shamseldin, H., Tala, S. Al, Varaghchi, J. Rezazadeh, Najafi, Maryam, Deschner, S., Gläser, D., Hüttel, W., Kruer, M.C., Kamsteeg, E.J., Takiyama, Y., Züchner, S., Baets, J., Synofzik, M., Schüle, R., Horvath, R., Pierson, T.M., and Senderek, J.

Abstract

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

Published
2021

32. ALG13 X-linked intellectual disability: New variants, glycosylation analysis, and expanded phenotypes

Author

Alsharhan, H, He, M, Edmondson, AC, Daniel, EJP, Chen, J, Donald, T, Bakhtiari, S, Amor, DJ, Jones, EA, Vassallo, G, Vincent, M, Cogne, B, Deb, W, Werners, AH, Jin, SC, Bilguvar, K, Christodoulou, J, Webster, RI, Yearwood, KR, Ng, BG, Freeze, HH, Kruer, MC, Li, D, Raymond, KM, Bhoj, EJ, Sobering, AK, Alsharhan, H, He, M, Edmondson, AC, Daniel, EJP, Chen, J, Donald, T, Bakhtiari, S, Amor, DJ, Jones, EA, Vassallo, G, Vincent, M, Cogne, B, Deb, W, Werners, AH, Jin, SC, Bilguvar, K, Christodoulou, J, Webster, RI, Yearwood, KR, Ng, BG, Freeze, HH, Kruer, MC, Li, D, Raymond, KM, Bhoj, EJ, and Sobering, AK

Abstract

Pathogenic variants in ALG13 (ALG13 UDP-N-acetylglucosaminyltransferase subunit) cause an X-linked congenital disorder of glycosylation (ALG13-CDG) where individuals have variable clinical phenotypes that include developmental delay, intellectual disability, infantile spasms, and epileptic encephalopathy. Girls with a recurrent de novo c.3013C>T; p.(Asn107Ser) variant have normal transferrin glycosylation. Using a highly sensitive, semi-quantitative flow injection-electrospray ionization-quadrupole time-of-flight mass spectrometry (ESI-QTOF/MS) N-glycan assay, we report subtle abnormalities in N-glycans that normally account for <0.3% of the total plasma glycans that may increase up to 0.5% in females with the p.(Asn107Ser) variant. Among our 11 unrelated ALG13-CDG individuals, one male had abnormal serum transferrin glycosylation. We describe seven previously unreported subjects including three novel variants in ALG13 and report a milder neurodevelopmental course. We also summarize the molecular, biochemical, and clinical data for the 53 previously reported ALG13-CDG individuals. We provide evidence that ALG13 pathogenic variants may mildly alter N-linked protein glycosylation in both female and male subjects, but the underlying mechanism remains unclear.

Published
2021

34. Bi-allelic variants in SPATA5L1 lead to intellectual disability, spastic-dystonic cerebral palsy, epilepsy, and hearing loss

Author

Richard, E. M., Bakhtiari, S., Marsh, A. P. L., Kaiyrzhanov, R., Wagner, M., Shetty, S., Pagnozzi, A., Nordlie, S. M., Guida, B. S., Cornejo, P., Magee, H., Liu, J., Norton, B. Y., Webster, R. I., Worgan, L., Hakonarson, H., Li, J., Guo, Y., Jain, M., Blesson, A., Rodan, L. H., Abbott, M. -A., Comi, A., Cohen, J. S., Alhaddad, B., Meitinger, T., Lenz, D., Ziegler, A., Kotzaeridou, U., Brunet, T., Chassevent, A., Smith-Hicks, C., Ekstein, J., Weiden, T., Hahn, A., Zharkinbekova, N., Turnpenny, P., Tucci, A., Yelton, M., Horvath, R., Gungor, S., Hiz, S., Oktay, Y., Lochmuller, H., Zollino, M., Morleo, M., Marangi, G., Nigro, V., Torella, A., Pinelli, M., Amenta, S., Husain, R. A., Grossmann, B., Rapp, M., Steen, C., Marquardt, I., Grimmel, M., Grasshoff, U., Korenke, G. C., Owczarek-Lipska, M., Neidhardt, J., Radio, F. C., Mancini, C., Claps Sepulveda, D. J., McWalter, K., Begtrup, A., Crunk, A., Guillen Sacoto, M. J., Person, R., Schnur, R. E., Mancardi, M. M., Kreuder, F., Striano, P., Zara, F., Chung, W. K., Marks, W. A., van Eyk, C. L., Webber, D. L., Corbett, M. A., Harper, K., Berry, J. G., MacLennan, A. H., Gecz, J., Tartaglia, M., Salpietro, V., Christodoulou, J., Kaslin, J., Padilla-Lopez, S., Bilguvar, K., Munchau, A., Ahmed, Z. M., Hufnagel, R. B., Fahey, M. C., Maroofian, R., Houlden, H., Sticht, H., Mane, S. M., Rad, A., Vona, B., Jin, S. C., Haack, T. B., Makowski, C., Hirsch, Y., Riazuddin, S., Kruer, M. C., Zollino M. (ORCID:0000-0003-4871-9519), Marangi G. (ORCID:0000-0002-6898-8882), Richard, E. M., Bakhtiari, S., Marsh, A. P. L., Kaiyrzhanov, R., Wagner, M., Shetty, S., Pagnozzi, A., Nordlie, S. M., Guida, B. S., Cornejo, P., Magee, H., Liu, J., Norton, B. Y., Webster, R. I., Worgan, L., Hakonarson, H., Li, J., Guo, Y., Jain, M., Blesson, A., Rodan, L. H., Abbott, M. -A., Comi, A., Cohen, J. S., Alhaddad, B., Meitinger, T., Lenz, D., Ziegler, A., Kotzaeridou, U., Brunet, T., Chassevent, A., Smith-Hicks, C., Ekstein, J., Weiden, T., Hahn, A., Zharkinbekova, N., Turnpenny, P., Tucci, A., Yelton, M., Horvath, R., Gungor, S., Hiz, S., Oktay, Y., Lochmuller, H., Zollino, M., Morleo, M., Marangi, G., Nigro, V., Torella, A., Pinelli, M., Amenta, S., Husain, R. A., Grossmann, B., Rapp, M., Steen, C., Marquardt, I., Grimmel, M., Grasshoff, U., Korenke, G. C., Owczarek-Lipska, M., Neidhardt, J., Radio, F. C., Mancini, C., Claps Sepulveda, D. J., McWalter, K., Begtrup, A., Crunk, A., Guillen Sacoto, M. J., Person, R., Schnur, R. E., Mancardi, M. M., Kreuder, F., Striano, P., Zara, F., Chung, W. K., Marks, W. A., van Eyk, C. L., Webber, D. L., Corbett, M. A., Harper, K., Berry, J. G., MacLennan, A. H., Gecz, J., Tartaglia, M., Salpietro, V., Christodoulou, J., Kaslin, J., Padilla-Lopez, S., Bilguvar, K., Munchau, A., Ahmed, Z. M., Hufnagel, R. B., Fahey, M. C., Maroofian, R., Houlden, H., Sticht, H., Mane, S. M., Rad, A., Vona, B., Jin, S. C., Haack, T. B., Makowski, C., Hirsch, Y., Riazuddin, S., Kruer, M. C., Zollino M. (ORCID:0000-0003-4871-9519), and Marangi G. (ORCID:0000-0002-6898-8882)

Abstract

Spermatogenesis-associated 5 like 1 (SPATA5L1) represents an orphan gene encoding a protein of unknown function. We report 28 bi-allelic variants in SPATA5L1 associated with sensorineural hearing loss in 47 individuals from 28 (26 unrelated) families. In addition, 25/47 affected individuals (53%) presented with microcephaly, developmental delay/intellectual disability, cerebral palsy, and/or epilepsy. Modeling indicated damaging effect of variants on the protein, largely via destabilizing effects on protein domains. Brain imaging revealed diminished cerebral volume, thin corpus callosum, and periventricular leukomalacia, and quantitative volumetry demonstrated significantly diminished white matter volumes in several individuals. Immunofluorescent imaging in rat hippocampal neurons revealed localization of Spata5l1 in neuronal and glial cell nuclei and more prominent expression in neurons. In the rodent inner ear, Spata5l1 is expressed in the neurosensory hair cells and inner ear supporting cells. Transcriptomic analysis performed with fibroblasts from affected individuals was able to distinguish affected from controls by principal components. Analysis of differentially expressed genes and networks suggested a role for SPATA5L1 in cell surface adhesion receptor function, intracellular focal adhesions, and DNA replication and mitosis. Collectively, our results indicate that bi-allelic SPATA5L1 variants lead to a human disease characterized by sensorineural hearing loss (SNHL) with or without a nonprogressive mixed neurodevelopmental phenotype.

Published
2021

35. De novo CLTC variants are associated with a variable phenotype from mild to severe intellectual disability, microcephaly, hypoplasia of the corpus callosum, and epilepsy

Author

Nabais Sá, M.J., Venselaar, H., Wiel, L.J.M. van de, Trimouille, A., Lasseaux, E., Naudion, S., Lacombe, D., Piton, A., Vincent-Delorme, C., Zweier, C., Reis, A., Trollmann, R., Ruiz, A., Gabau, E., Vetro, A., Guerrini, R., Bakhtiari, S., Kruer, M.C., Amor, D.J., Cooper, M.S., Bijlsma, E.K., Barakat, T.S., Dooren, M.F. van, Slegtenhorst, M. van, Pfundt, R.P., Gilissen, C.F., Willemsen, M.A., Vries, B.B.A. de, Brouwer, A.P.M. de, Koolen, D.A., Nabais Sá, M.J., Venselaar, H., Wiel, L.J.M. van de, Trimouille, A., Lasseaux, E., Naudion, S., Lacombe, D., Piton, A., Vincent-Delorme, C., Zweier, C., Reis, A., Trollmann, R., Ruiz, A., Gabau, E., Vetro, A., Guerrini, R., Bakhtiari, S., Kruer, M.C., Amor, D.J., Cooper, M.S., Bijlsma, E.K., Barakat, T.S., Dooren, M.F. van, Slegtenhorst, M. van, Pfundt, R.P., Gilissen, C.F., Willemsen, M.A., Vries, B.B.A. de, Brouwer, A.P.M. de, and Koolen, D.A.

Abstract

Contains fulltext : 218155.pdf (Publisher’s version ) (Closed access), PURPOSE: To delineate the genotype-phenotype correlation in individuals with likely pathogenic variants in the CLTC gene. METHODS: We describe 13 individuals with de novo CLTC variants. Causality of variants was determined by using the tolerance landscape of CLTC and computer-assisted molecular modeling where applicable. Phenotypic abnormalities observed in the individuals identified with missense and in-frame variants were compared with those with nonsense or frameshift variants in CLTC. RESULTS: All de novo variants were judged to be causal. Combining our data with that of 14 previously reported affected individuals (n = 27), all had intellectual disability (ID), ranging from mild to moderate/severe, with or without additional neurologic, behavioral, craniofacial, ophthalmologic, and gastrointestinal features. Microcephaly, hypoplasia of the corpus callosum, and epilepsy were more frequently observed in individuals with missense and in-frame variants than in those with nonsense and frameshift variants. However, this difference was not significant. CONCLUSIONS: The wide phenotypic variability associated with likely pathogenic CLTC variants seems to be associated with allelic heterogeneity. The detailed clinical characterization of a larger cohort of individuals with pathogenic CLTC variants is warranted to support the hypothesis that missense and in-frame variants exert a dominant-negative effect, whereas the nonsense and frameshift variants would result in haploinsufficiency.

Published
2020

36. Loss of TNR causes a nonprogressive neurodevelopmental disorder with spasticity and transient opisthotonus

Author

Wagner, M., Levy, J., Jung-Klawitter, S., Bakhtiari, S., Monteiro, F., Maroofian, R., Bierhals, T., Hempel, M., Elmaleh-Berges, M., Kitajima, J.P., Kim, C.A., Salomao, J.G., Amor, D.J., Cooper, M.S., Perrin, L., Pipiras, E., Neu, A., Doosti, M., Karimiani, E.G., Toosi, M.B., Houlden, H., Jin, S.C., Si, Y.C., Rodan, L.H., Venselaar, H., Kruer, M.C., Kok, F., Hoffmann, G.F., Strom, T.M., Wortmann, S.B., Tabet, A.C., Opladen, T., Wagner, M., Levy, J., Jung-Klawitter, S., Bakhtiari, S., Monteiro, F., Maroofian, R., Bierhals, T., Hempel, M., Elmaleh-Berges, M., Kitajima, J.P., Kim, C.A., Salomao, J.G., Amor, D.J., Cooper, M.S., Perrin, L., Pipiras, E., Neu, A., Doosti, M., Karimiani, E.G., Toosi, M.B., Houlden, H., Jin, S.C., Si, Y.C., Rodan, L.H., Venselaar, H., Kruer, M.C., Kok, F., Hoffmann, G.F., Strom, T.M., Wortmann, S.B., Tabet, A.C., and Opladen, T.

Abstract

Contains fulltext : 220941.pdf (Publisher’s version ) (Closed access), PURPOSE: TNR, encoding Tenascin-R, is an extracellular matrix glycoprotein involved in neurite outgrowth and neural cell adhesion, proliferation and migration, axonal guidance, myelination, and synaptic plasticity. Tenascin-R is exclusively expressed in the central nervous system with highest expression after birth. The protein is crucial in the formation of perineuronal nets that ensheath interneurons. However, the role of Tenascin-R in human pathology is largely unknown. We aimed to establish TNR as a human disease gene and unravel the associated clinical spectrum. METHODS: Exome sequencing and an online matchmaking tool were used to identify patients with biallelic variants in TNR. RESULTS: We identified 13 individuals from 8 unrelated families with biallelic variants in TNR sharing a phenotype consisting of spastic para- or tetraparesis, axial muscular hypotonia, developmental delay, and transient opisthotonus. Four homozygous loss-of-function and four different missense variants were identified. CONCLUSION: We establish TNR as a disease gene for an autosomal recessive nonprogressive neurodevelopmental disorder with spasticity and transient opisthotonus and highlight the role of central nervous system extracellular matrix proteins in the pathogenicity of spastic disorders.

Published
2020

37. De novo CLTC variants are associated with a variable phenotype from mild to severe intellectual disability, microcephaly, hypoplasia of the corpus callosum, and epilepsy

Author

Sa, MJN, Venselaar, H, Wiel, L, Trimouille, A, Lasseaux, E, Naudion, S, Lacombe, D, Piton, A, Vincent-Delorme, C, Zweier, C, Reis, A, Trollmann, R, Ruiz, A, Gabau, E, Vetro, A, Guerrini, R, Bakhtiari, S, Kruer, MC, Amor, DJ, Cooper, MS, Bijlsma, EK, Barakat, TS, van Dooren, MF, van Slegtenhorst, M, Pfundt, R, Gilissen, C, Willemsen, MA, de Vries, BBA, de Brouwer, APM, Koolen, DA, Sa, MJN, Venselaar, H, Wiel, L, Trimouille, A, Lasseaux, E, Naudion, S, Lacombe, D, Piton, A, Vincent-Delorme, C, Zweier, C, Reis, A, Trollmann, R, Ruiz, A, Gabau, E, Vetro, A, Guerrini, R, Bakhtiari, S, Kruer, MC, Amor, DJ, Cooper, MS, Bijlsma, EK, Barakat, TS, van Dooren, MF, van Slegtenhorst, M, Pfundt, R, Gilissen, C, Willemsen, MA, de Vries, BBA, de Brouwer, APM, and Koolen, DA

Abstract

PURPOSE: To delineate the genotype-phenotype correlation in individuals with likely pathogenic variants in the CLTC gene. METHODS: We describe 13 individuals with de novo CLTC variants. Causality of variants was determined by using the tolerance landscape of CLTC and computer-assisted molecular modeling where applicable. Phenotypic abnormalities observed in the individuals identified with missense and in-frame variants were compared with those with nonsense or frameshift variants in CLTC. RESULTS: All de novo variants were judged to be causal. Combining our data with that of 14 previously reported affected individuals (n = 27), all had intellectual disability (ID), ranging from mild to moderate/severe, with or without additional neurologic, behavioral, craniofacial, ophthalmologic, and gastrointestinal features. Microcephaly, hypoplasia of the corpus callosum, and epilepsy were more frequently observed in individuals with missense and in-frame variants than in those with nonsense and frameshift variants. However, this difference was not significant. CONCLUSIONS: The wide phenotypic variability associated with likely pathogenic CLTC variants seems to be associated with allelic heterogeneity. The detailed clinical characterization of a larger cohort of individuals with pathogenic CLTC variants is warranted to support the hypothesis that missense and in-frame variants exert a dominant-negative effect, whereas the nonsense and frameshift variants would result in haploinsufficiency.

Published
2020

38. Damaging de novo missense variants in EEF1A2 lead to a developmental and degenerative epileptic-dyskinetic encephalopathy

Author

Carvill, GL, Helbig, KL, Myers, CT, Scala, M, Huether, R, Lewis, S, Kruer, TN, Guida, BS, Bakhtiari, S, Sebe, J, Tang, S, Stickney, H, Oktay, SU, Bhandiwad, AA, Ramsey, K, Narayanan, V, Feyma, T, Rohena, LO, Accogli, A, Severino, M, Hollingsworth, G, Gill, D, Depienne, C, Nava, C, Sadleir, LG, Caruso, PA, Lin, AE, Jansen, FE, Koeleman, B, Brilstra, E, Willemsen, MH, Kleefstra, T, Sa, J, Mathieu, M-L, Perrin, L, Lesca, G, Striano, P, Casari, G, Scheffer, IE, Raible, D, Sattlegger, E, Capra, V, Padilla-Lopez, S, Mefford, HC, Kruer, MC, Carvill, GL, Helbig, KL, Myers, CT, Scala, M, Huether, R, Lewis, S, Kruer, TN, Guida, BS, Bakhtiari, S, Sebe, J, Tang, S, Stickney, H, Oktay, SU, Bhandiwad, AA, Ramsey, K, Narayanan, V, Feyma, T, Rohena, LO, Accogli, A, Severino, M, Hollingsworth, G, Gill, D, Depienne, C, Nava, C, Sadleir, LG, Caruso, PA, Lin, AE, Jansen, FE, Koeleman, B, Brilstra, E, Willemsen, MH, Kleefstra, T, Sa, J, Mathieu, M-L, Perrin, L, Lesca, G, Striano, P, Casari, G, Scheffer, IE, Raible, D, Sattlegger, E, Capra, V, Padilla-Lopez, S, Mefford, HC, and Kruer, MC

Abstract

Heterozygous de novo variants in the eukaryotic elongation factor EEF1A2 have previously been described in association with intellectual disability and epilepsy but never functionally validated. Here we report 14 new individuals with heterozygous EEF1A2 variants. We functionally validate multiple variants as protein-damaging using heterologous expression and complementation analysis. Our findings allow us to confirm multiple variants as pathogenic and broaden the phenotypic spectrum to include dystonia/choreoathetosis, and in some cases a degenerative course with cerebral and cerebellar atrophy. Pathogenic variants appear to act via a haploinsufficiency mechanism, disrupting both the protein synthesis and integrated stress response functions of EEF1A2. Our studies provide evidence that EEF1A2 is highly intolerant to variation and that de novo pathogenic variants lead to an epileptic-dyskinetic encephalopathy with both neurodevelopmental and neurodegenerative features. Developmental features may be driven by impaired synaptic protein synthesis during early brain development while progressive symptoms may be linked to an impaired ability to handle cytotoxic stressors.

Published
2020

50. Genetic and phenotypic characterization of NKX6‐2 ‐related spastic ataxia and hypomyelination

Author

Chelban, V., primary, Alsagob, M., additional, Kloth, K., additional, Chirita‐Emandi, A., additional, Vandrovcova, J., additional, Maroofian, R., additional, Davagnanam, I., additional, Bakhtiari, S., additional, AlSayed, M. D., additional, Rahbeeni, Z., additional, AlZaidan, H., additional, Malintan, N. T., additional, Johannsen, J., additional, Efthymiou, S., additional, Ghayoor Karimiani, E., additional, Mankad, K., additional, Al‐Shahrani, S. A., additional, Beiraghi Toosi, M., additional, AlShammari, M., additional, Groppa, S., additional, Haridy, N. A., additional, AlQuait, L., additional, Qari, A., additional, Huma, R., additional, Salih, M. A., additional, Almass, R., additional, Almutairi, F. B., additional, Hamad, M. H., additional, Alorainy, I. A., additional, Ramzan, K., additional, Imtiaz, F., additional, Puiu, M., additional, Kruer, M. C., additional, Bierhals, T., additional, Wood, N. W., additional, Colak, D., additional, Houlden, H., additional, and Kaya, N., additional

Published
2019
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