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A clinical case of SYNGAP1-associated encephalopathy in a girl with epilepsy, intellectual disability, and autism

https://doi.org/10.14412/2074-2711-2018-1S-62-65

Abstract

This paper describes a female patient aged 3 years 6 months with SYNGAP1-associated encephalopathy manifesting with symptomatic epilepsy, intellectual disability, and autism. There were difficulties in  differential diagnosis, since in addition to SYNGAP1 mutation (c2214_2217deltgag), heterozygous BCKDHB gene mutation  (chr6: 80910740G>a, rs3834233) and microduplication of a segment of chromosome 22 were found de novo. The features of the course and  treatment of epilepsy in SYNGAP1 are discussed. A combination of  valproic acid and oxcarbazepine was the most effective treatment for epilepsy.

About the Authors

N. N. Savelieva
V.D. Seredavin Samara Regional Clinical Hospital Samara State Medical University, Ministry of Health of Russia
Russian Federation

159, Tashkentskaya St., Samara 443095

89, Chapaevskaya St., Samara 443099



A. V. Yakunina
Samara State Medical University, Ministry of Health of Russia
Russian Federation
89, Chapaevskaya St., Samara 443099


I. E. Poverennova
Samara State Medical University, Ministry of Health of Russia
Russian Federation
89, Chapaevskaya St., Samara 443099


References

1. Hamdan FF, Gauthier J, Spiegelman D, et al. Mutations in SYNGAP1 in autosomal nonsyndromic mental retardation. N Engl J Med. 2009;360(6):599-605. doi: 10.1056/NEJMoa0805392

2. Berryer MH, Hamdan FF, Klitten LL, et al. Mutations in SYNGAP1 cause intellectual disability, autism, and a specific form of epilepsy by inducing haploinsufficiency. Hum Mutat. 2013 Feb;34(2):385-94. doi: 10.1002/humu.22248

3. Parker MJ, Fryer AE, Shears DJ, et al. De novo, heterozygous, loss-of-function mutations in SYNGAP1 cause a syndromic form of intellectual disability. Am J Med Genet A. 2015 Oct;167A(10):2231-7. doi: 10.1002/ajmg.a.37189

4. Von Stü lpnagel C, Funke C, Haberl C, et al. SYNGAP1 Mutation in Focal and Generalized Epilepsy: A Literature Overview and A Case Report with Special Aspects of the EEG. Neuropediatrics. 2015 Aug;46(4):287-91. doi: 10.1055/s-0035-1554098

5. Mignot C, von Stü lpnagel C, Nava C, et al. Genetic and neurodevelopmental spectrum of SYNGAP1-assotiated intellectual disability and epilepsy. J Med Genet. 2016 Aug;53(8):511- 22. doi: 10.1136/jmedgenet-2015-103451

6. Prchalova D, Havlovicova M, Sterbova K. Analysis of 31-year-old patient with SYNGAP1 gene defect points to importance of variants in broader splice regions and reveals developmental trajectory of SYNGAP1-associated phenotype: case report. BMC Med Genet. 2017 Jun 2;18(1):62. doi: 10.1186/s12881-017-0425-4

7. Hamdan FF, Daoud H, Piton A, et al. De novo SYNGAP1 mutations in nonsyndromic intellectual disability and autism. Biol Psychiatry. 2011;69(9):898-901. doi: 10.1016/j.biopsych.2010.11.015

8. Carvill GL, Heavin SB, Yendle SC, et al. Targeted resequencing in epileptic encephalopathies identifies de novo mutations in CHD2 and SYNGAP1. Nat Genet. 2013;45(7):825-30. doi: 10.1038/ng.2646

9. Clement JP, Aceti M, Creson TK, et al. Pathogenic SYNGAP1 mutations impair cognitive development by disrupting maturation of dendritic spine synapses. Cell. 2012;151(4):709-23. doi: 10.1016/j.cell.2012.08.045

10. Weldon M, Kilinc M, Holder JL. The first international conference on SYNGAP1-related brain disorders: a stakeholder meeting of families, researchers, clinicians, and regulators. J Neurodev Disord. 2018 Feb 5;10(1):6. doi: 10.1186/s11689-018-9225-1

11. Бобылова МЮ, Миронов МБ, Куликов АВ и др. Клинический случай мутации гена SYNGAP1, с2214_2217delTGAG de novo у девочки с эпилепсией, умственной отсталостью, аутизмом и двигательными нарушениями. Неврология, нейропсихиатрия, психосоматика. 2014;(2):34-40 [Bobylova MYu, Mironov MB, Kulikov AV, et al. A clinical case of SYNGAP1, с2214_2217delTGAG de novo gene mutations in a girl with epilepsy, mental retardation, autism, and movement disorders. Nevrologiya, Neiropsihiatriya, Psyhosomatika = Neurology, Neuropsychiatry, Psychosomatics. 2014;6(2):34-40 (In Russ.)]. doi: 10.14412/2074-2711-2014-2-34-40

12. Whiteley P, Shattock P, Knivsberg AM, et al. Gluten- and casein-free dietary intervention for autism spectrum conditions. Front Hum Neurosci. 2013 Jan 4;6:344. doi: 10.3389/fnhum.2012.00344


Review

For citations:


Savelieva NN, Yakunina AV, Poverennova IE. A clinical case of SYNGAP1-associated encephalopathy in a girl with epilepsy, intellectual disability, and autism. Nevrologiya, neiropsikhiatriya, psikhosomatika = Neurology, Neuropsychiatry, Psychosomatics. 2018;10(1S):62-65. (In Russ.) https://doi.org/10.14412/2074-2711-2018-1S-62-65

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ISSN 2074-2711 (Print)
ISSN 2310-1342 (Online)