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2 results on '"Christensen, KM"'

1. De Novo and Bi-allelic Pathogenic Variants in NARS1 Cause Neurodevelopmental Delay Due to Toxic Gain-of-Function and Partial Loss-of-Function Effects

Author

Manole, A, Efthymiou, S, O'Connor, E, Mendes, MI, Jennings, M, Maroofian, R, Davagnanam, I, Mankad, K, Lopez, MR, Salpietro, V, Harripaul, R, Badalato, L, Walia, J, Francklyn, CS, Athanasiou-Fragkouli, A, Sullivan, R, Desai, S, Baranano, K, Zafar, F, Rana, N, Ilyas, M, Horga, A, Kara, M, Mattioli, F, Goldenberg, A, Griffin, H, Piton, A, Henderson, LB, Kara, B, Aslanger, AD, Raaphorst, J, Pfundt, R, Portier, R, Shinawi, M, Kirby, A, Christensen, KM, Wang, L, Rosti, RO, Paracha, SA, Sarwar, MT, Jenkins, D, SYNAPS Study Group, Ahmed, J, Santoni, FA, Ranza, E, Iwaszkiewicz, J, Cytrynbaum, C, Weksberg, R, Wentzensen, IM, Guillen Sacoto, MJ, Si, Y, Telegrafi, A, Andrews, MV, Baldridge, D, Gabriel, H, Mohr, J, Oehl-Jaschkowitz, B, Debard, S, Senger, B, Fischer, F, van Ravenwaaij, C, Fock, AJM, Stevens, SJC, Bähler, J, Nasar, A, Mantovani, JF, Manzur, A, Sarkozy, A, Smith, DEC, Salomons, GS, Ahmed, ZM, Riazuddin, S, Usmani, MA, Seibt, A, Ansar, M, Antonarakis, SE, Vincent, JB, Ayub, M, Grimmel, M, Jelsig, AM, Hjortshøj, TD, Karstensen, HG, Hummel, M, Haack, TB, Jamshidi, Y, Distelmaier, F, Horvath, R, Gleeson, JG, Becker, H, Mandel, J-L, Koolen, DA, and Houlden, H

Abstract

Aminoacyl-tRNA synthetases (ARSs) are ubiquitous, ancient enzymes that charge amino acids to cognate tRNA molecules, the essential first step of protein translation. Here, we describe 32 individuals from 21 families, presenting with microcephaly, neurodevelopmental delay, seizures, peripheral neuropathy, and ataxia, with de novo heterozygous and bi-allelic mutations in asparaginyl-tRNA synthetase (NARS1). We demonstrate a reduction in NARS1 mRNA expression as well as in NARS1 enzyme levels and activity in both individual fibroblasts and induced neural progenitor cells (iNPCs). Molecular modeling of the recessive c.1633C>T (p.Arg545Cys) variant shows weaker spatial positioning and tRNA selectivity. We conclude that de novo and bi-allelic mutations in NARS1 are a significant cause of neurodevelopmental disease, where the mechanism for de novo variants could be toxic gain-of-function and for recessive variants, partial loss-of-function.

Published
2020

2. Phenotypic spectrum and transcriptomic profile associated with germline variants in TRAF7

Author

Castilla-Vallmanya L, Selmer KK, Dimartino C, Raquel Rabionet Janssen, Blanco-Sánchez B, Yang S, Reijnders MRF, van Essen AJ, Oufadem M, Vigeland MD, Stadheim B, Houge G, Cox H, Kingston H, Clayton-Smith J, Innis JW, Iascone M, Cereda A, Gabbiadini S, Chung WK, Sanders V, Charrow J, Bryant E, Millichap J, Vitobello A, Thauvin C, Mau-Them FT, Faivre L, Lesca G, Labalme A, Rougeot C, Chatron N, Sanlaville D, Christensen KM, Kirby A, Lewandowski R, Gannaway R, Aly M, Lehman A, Clarke L, Graul-Neumann L, Zweier C, Lessel D, Lozic B, Aukrust I, Peretz R, Stratton R, Smol T, Dieux-Coëslier A, Meira J, Wohler E, Sobreira N, Beaver EM, Heeley J, Briere LC, High FA, Sweetser DA, Walker MA, Keegan CE, Jayakar P, Shinawi M, Kerstjens-Frederikse WS, Earl DL, Siu VM, Reesor E, Yao T, Hegele RA, Vaske OM, Rego S, Undiagnosed Diseases Network, Care4Rare Canada Consortium, Shapiro KA, Wong B, Gambello MJ, McDonald M, Karlowicz D, Colombo R, Serretti A, Pais L, O'Donnell-Luria A, Wray A, Sadedin S, Chong B, Tan TY, Christodoulou J, White SM, Slavotinek A, Barbouth D, Morel Swols D, Parisot M, Bole-Feysot C, Nitschké P, Pingault V, Munnich A, Cho MT, Cormier-Daire V, Balcells S, Lyonnet S, Grinberg-Vaisman DR, Amiel J, Urreizti R, and Gordon CT

Subjects
craniofacial development, patent ductus arteriosus, TRAF7, intellectual disability, blepharophimosis
Abstract

PURPOSE: Somatic variants in tumor necrosis factor receptor-associated factor 7 (TRAF7) cause meningioma, while germline variants have recently been identified in seven patients with developmental delay and cardiac, facial, and digital anomalies. We aimed to define the clinical and mutational spectrum associated with TRAF7 germline variants in a large series of patients, and to determine the molecular effects of the variants through transcriptomic analysis of patient fibroblasts. METHODS: We performed exome, targeted capture, and Sanger sequencing of patients with undiagnosed developmental disorders, in multiple independent diagnostic or research centers. Phenotypic and mutational comparisons were facilitated through data exchange platforms. Whole-transcriptome sequencing was performed on RNA from patient- and control-derived fibroblasts. RESULTS: We identified heterozygous missense variants in TRAF7 as the cause of a developmental delay-malformation syndrome in 45 patients. Major features include a recognizable facial gestalt (characterized in particular by blepharophimosis), short neck, pectus carinatum, digital deviations, and patent ductus arteriosus. Almost all variants occur in the WD40 repeats and most are recurrent. Several differentially expressed genes were identified in patient fibroblasts. CONCLUSION: We provide the first large-scale analysis of the clinical and mutational spectrum associated with the TRAF7 developmental syndrome, and we shed light on its molecular etiology through transcriptome studies.

Published
2020

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