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Journal of Neurology

, Volume 266, Issue 6, pp 1439–1448 | Cite as

Screening of SLC2A1 in a large cohort of patients suspected for Glut1 deficiency syndrome: identification of novel variants and associated phenotypes

  • Barbara Castellotti
  • Francesca Ragona
  • Elena Freri
  • Roberta Solazzi
  • Stefano Ciardullo
  • Giovanni Tricomi
  • Anna Venerando
  • Barbara Salis
  • Laura Canafoglia
  • Flavio Villani
  • Silvana Franceschetti
  • Nardo Nardocci
  • Cinzia Gellera
  • Jacopo C. DiFrancescoEmail author
  • Tiziana GranataEmail author
Original Communication

Abstract

Glucose transporter type 1 deficiency syndrome (Glut1 DS) is a rare neurological disorder caused by impaired glucose delivery to the brain. The clinical spectrum of Glut1 DS mainly includes epilepsy, paroxysmal dyskinesia (PD), developmental delay and microcephaly. Glut1 DS diagnosis is based on the identification of hypoglycorrhachia and pathogenic mutations of the SLC2A1 gene. Here, we report the molecular screening of SLC2A1 in 354 patients clinically suspected for Glut1 DS. From this cohort, we selected 245 patients for whom comprehensive clinical and laboratory data were available. Among them, we identified 19 patients carrying nucleotide variants of pathological significance, 5 of which were novel. The symptoms of onset, which varied from neonatal to adult age, included epilepsy, PD or non-epileptic paroxysmal manifestations. The comparison of the clinical features between the 19 SLC2A1 mutated and the 226 non-mutated patients revealed that the onset of epilepsy within the first year of life (when associated with developmental delay or other neurological manifestations), the association of epilepsy with PD and acquired microcephaly are more common in mutated subjects. Taken together, these data confirm the variability of expression of the phenotypes associated with mutation of SLC2A1 and provide useful clinical tools for the early identification of subjects highly suspected for the disease.

Keywords

Glut1 deficiency SLC2A1 Hypoglycorrhachia Epilepsy Movement disorder Intellectual disability Developmental delay 

Notes

Acknowledgements

The authors are deeply grateful to: Drs Francesca Darra (Child Neuropsychiatry, University of Verona), Stefania Bergamoni (Azienda Ospedaliera Ospedale Niguarda Ca’ Granda, Milano), Monica Lodi (Centro Regionale per l’Epilessia, Asst Fatebenefratelli Sacco, Milano) and Carmen Bonino (Torino) for referring patients and to Dr. Sara Matricardi (Department of Neuropsychiatry, Children’s Hospital “G. Salesi”, Ospedali Riuniti, Ancona) for her help with statistical analysis.

Author contributions

Genetic screening and analysis, writing of the manuscript (BC, AV, CG); selection of patients, collection and analysis of clinical data (FR, EF, SC, RS, GT, BS, NN, TG); selection of patients, collection of clinical and EEG data (LC, FV, SF); clinical and genetic data analysis, writing of the manuscript (BC, FR, JCD); clinical and genetic data analysis, writing of the manuscript, coordination of the selection of patients, final supervision of the manuscript and submission (CG, TG).

Funding

The present work was supported by the Bando Cariplo 2010 per la ricerca Biomedica no. 2010.0759, the Italian Ministry of Health Ricerca Finalizzata Giovani Ricercatori 2010 (Project GR-2010-2304834 to JCD) and Ricerca Finalizzata Giovani Ricercatori 2016 (Project GR-2016-02363337 to JCD), and Grants from the Pierfranco and Luisa Mariani Foundation (to TG).

Compliance with ethical standards

Conflicts of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

Supplementary material

415_2019_9280_MOESM1_ESM.pdf (294 kb)
Supplementary material 1 (PDF 293 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Unit of Genetics of Neurodegenerative and Metabolic DiseasesFondazione IRCCS Istituto Neurologico Carlo BestaMilanItaly
  2. 2.Department of Pediatric NeuroscienceFondazione IRCCS Istituto Neurologico Carlo BestaMilanItaly
  3. 3.Unit of Infancy and Adolescence NeuropsychiatryAzienda Unità Sanitaria Locale della RomagnaCesenaItaly
  4. 4.Clinical Neurophysiology and Epilepsy CenterFondazione IRCCS Istituto Neurologico Carlo BestaMilanItaly
  5. 5.Clinical and Experimental EpileptologyFondazione IRCCS Istituto Neurologico Carlo BestaMilanItaly
  6. 6.Department of NeurologySan Gerardo Hospital, University of Milano-BicoccaMonzaItaly

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