Progressive myoclonus epilepsy and ceroidolipofuscinosis 14: The multifaceted phenotypic spectrum of KCTD7-related disorders

Mario Mastrangelo, Stefano Sartori, Alessandro Simonati, Mario Brinciotti, Francesca Moro, Margherita Nosadini, Francesco Pezzini, Stefano Doccini, Filippo Maria Santorelli, Vincenzo Leuzzi

Research output: Contribution to journalArticle

Abstract

Background: Mutations in the KCTD7 gene have been associated with progressive myoclonus epilepsy and, in a single patient, with the so-called “Neuronal Ceroid Lipofuscinosis 14” (characterised by myoclonic seizures, cognitive regression, optic atrophy leading to visual loss, and progressive cortical and cerebellar atrophy). Clinical reports: We describe two new patients carrying two novel pathogenic mutations in the KCTD7 gene. Patient 1 (NM_153033.4: c.[533C > T], NP_694578: p.[(Ala178Val)]) was a 17-year-old girl who presented with early-onset epilepsy resembling epilepsia partialis continua (responsive to intravenous corticosteroids and immunoglobulins), and later developed myoclonic seizures and atypical absences, photosensitivity to very low frequencies and progressive seizures-related neurocognitive and motor deterioration. Patient 2 (NM_153033.4: c.[172G>A], NP_694578: p.[(Gly58Arg)]) presented with early neurological regression, myoclonic seizures and lysosomal storage material which was consistent with a neuronal ceroid lipofuscinosis (NCL) at skin biopsy. Both patients had non epileptic myoclonus. Conclusions: The two reported patients carrying novel pathogenic variants in KCTD7 gene presented with a remarkable phenotypic heterogeneity including: a) progressive myoclonus epilepsy without NCL-type lysosomal storages; b) progressive myoclonus epilepsy with lysosomal storages resembling NCL pattern (NCL14); c) progressive myoclonus epilepsy with epilepsia partialis continua.

Original languageEnglish
JournalEuropean Journal of Medical Genetics
DOIs
Publication statusAccepted/In press - Jan 1 2018

Keywords

  • Developmental encephalopathies
  • Epilepsia partialis continua
  • Epileptic encephalopathies
  • Neuronal ceroidolipofuscinosis
  • Progressive myoclonus epilepsy

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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    Mastrangelo, M., Sartori, S., Simonati, A., Brinciotti, M., Moro, F., Nosadini, M., Pezzini, F., Doccini, S., Santorelli, F. M., & Leuzzi, V. (Accepted/In press). Progressive myoclonus epilepsy and ceroidolipofuscinosis 14: The multifaceted phenotypic spectrum of KCTD7-related disorders. European Journal of Medical Genetics. https://doi.org/10.1016/j.ejmg.2018.11.025