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DHDDS and NUS1: A Converging Pathway and Common Phenotype.
Williams, Laura J; Waller, Sophie; Qiu, Jessica; Innes, Emily; Elserafy, Noha; Procopis, Peter; Sampaio, Hugo; Mahant, Neil; Tchan, Michel C; Mohammad, Shekeeb S; Morales-Briceño, Hugo; Fung, Victor S C.
Afiliación
  • Williams LJ; Movement Disorder Unit, Department of Neurology, Westmead Hospital, Westmead, New South Wales, Australia.
  • Waller S; Movement Disorder Unit, Department of Neurology, Westmead Hospital, Westmead, New South Wales, Australia.
  • Qiu J; Movement Disorder Unit, Department of Neurology, Westmead Hospital, Westmead, New South Wales, Australia.
  • Innes E; TY Nelson Department of Neurology and Neurosurgery, The Children's Hospital at Westmead, Westmead, New South Wales, Australia.
  • Elserafy N; School of Medicine Sydney, The University of Notre Dame, Sydney, New South Wales, Australia.
  • Procopis P; Department of Genomic Medicine, Westmead Hospital, Westmead, New South Wales, Australia.
  • Sampaio H; TY Nelson Department of Neurology and Neurosurgery, The Children's Hospital at Westmead, Westmead, New South Wales, Australia.
  • Mahant N; The Children's Hospital at Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia.
  • Tchan MC; Department of Neurology, Sydney Children's Hospital, Randwick, New South Wales, Australia.
  • Mohammad SS; School of Women's and Children's Health, University of New South Wales, Sydney, New South Wales, Australia.
  • Morales-Briceño H; Movement Disorder Unit, Department of Neurology, Westmead Hospital, Westmead, New South Wales, Australia.
  • Fung VSC; Department of Genomic Medicine, Westmead Hospital, Westmead, New South Wales, Australia.
Mov Disord Clin Pract ; 11(1): 76-85, 2024 Jan.
Article en En | MEDLINE | ID: mdl-38291835
ABSTRACT

BACKGROUND:

Variants in dehydrodolichol diphosphate synthetase (DHDDS) and nuclear undecaprenyl pyrophosphate synthase 1 (NUS1) cause a neurodevelopmental disorder, classically with prominent epilepsy. Recent reports suggest a complex movement disorder and an overlapping phenotype has been postulated due to their combined role in dolichol synthesis. CASES We describe three patients with heterozygous variants in DHDDS and five with variants affecting NUS1. They bear a remarkably similar phenotype of a movement disorder dominated by multifocal myoclonus. Diagnostic clues include myoclonus exacerbated by action and facial involvement, and slowly progressive or stable, gait ataxia with disproportionately impaired tandem gait. Myoclonus is confirmed with neurophysiology, including EMG of facial muscles. LITERATURE REVIEW Ninety-eight reports of heterozygous variants in DHDDS, NUS1 and chromosome 6q22.1 structural alterations spanning NUS1, confirm the convergent phenotype of hypotonia at birth, developmental delay, multifocal myoclonus, ataxia, dystonia and later parkinsonism with or without generalized epilepsy. Other features include periodic exacerbations, stereotypies, anxiety, and dysmorphisms. Although their gene products contribute to dolichol biosynthesis, a key step in N-glycosylation, transferrin isoform profiles are typically normal. Imaging is normal or non-specific.

CONCLUSIONS:

Recognition of their shared phenotype may expedite diagnosis through chromosomal microarray and by including DHDDS/NUS1 in movement disorder gene panels.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Trastornos del Movimiento / Mioclonía Límite: Humans / Newborn Idioma: En Revista: Mov Disord Clin Pract Año: 2024 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Trastornos del Movimiento / Mioclonía Límite: Humans / Newborn Idioma: En Revista: Mov Disord Clin Pract Año: 2024 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Estados Unidos