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Browsing by Author "Wevers, RA"

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  • MEGDEL Syndrome: Expanding the Phenotype and New Mutations
    Publication . Sequeira, S; Rodrigues, M; Jacinto, S; Wevers, RA; Wortmann, SB
    2017Journal article Open access Show more
  • Mutations in SELENBP1, encoding a novel human methanethiol oxidase, cause extraoral halitosis
    Publication . Pol, A; Renkema, GH; Tangerman, A; Winkel, EG; Engelke, UF; de Brouwer, AM; Lloyd, KC; Araiza, RS; van den Heuvel, L; Omran, H; Olbrich, H; Oude Elberink, M; Gilissen, C; Rodenburg, R; Sass, JO; Schwab, KO; Schäfer, H; Venselaar, H; Sequeira, JS; Op den Camp, HM; Wevers, RA
    Selenium-binding protein 1 (SELENBP1) has been associated with several cancers, although its exact role is unknown. We show that SELENBP1 is a methanethiol oxidase (MTO), related to the MTO in methylotrophic bacteria, that converts methanethiol to H2O2, formaldehyde, and H2S, an activity not previously known to exist in humans. We identified mutations in SELENBP1 in five patients with cabbage-like breath odor. The malodor was attributable to high levels of methanethiol and dimethylsulfide, the main odorous compounds in their breath. Elevated urinary excretion of dimethylsulfoxide was associated with MTO deficiency. Patient fibroblasts had low SELENBP1 protein levels and were deficient in MTO enzymatic activity; these effects were reversed by lentivirus-mediated expression of wild-type SELENBP1. Selenbp1-knockout mice showed biochemical characteristics similar to those in humans. Our data reveal a potentially frequent inborn error of metabolism that results from MTO deficiency and leads to a malodor syndrome.
    2018-01Journal article Open access Show more
  • Progressive Deafness-Dystonia due to SERAC1 Mutations: A Study of 67 cases
    Publication . Maas, RR; Iwanicka-Pronicka, K; Kalkan Ucar, S; Alhaddad, B; AlSayed, M; Al-Owain, MA; Al-Zaidan, HI; Balasubramaniam, S; Barić, I; Bubshait, DK; Burlina, A; Christodoulou, J; Chung, WK; Colombo, R; Darin, N; Freisinger, P; Garcia Silva, MT; Grunewald, S; Haack, TB; van Hasselt, PM; Hikmat, O; Hörster, F; Isohanni, P; Ramzan, K; Kovacs-Nagy, R; Krumina, Z; Martin-Hernandez, E; Mayr, JA; McClean, P; De Meirleir, L; Naess, K; Ngu, LH; Pajdowska, M; Rahman, S; Riordan, G; Riley, L; Roeben, B; Rutsch, F; Santer, R; Schiff, M; Seders, M; Sequeira, S; Sperl, W; Staufner, C; Synofzik, M; Taylor, RW; Trubicka, J; Tsiakas, K; Unal, O; Wassmer, E; Wedatilake, Y; Wolff, T; Prokisch, H; Morava, E; Pronicka, E; Wevers, RA; de Brouwer, AP; Wortmann, SB
    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
    2017-12Journal article Open access Show more