Clinical and genetic characteristics of the early 66th type epileptic encephalopathy (literature review and own observation)

Cover Page

Cite item

Full Text

Abstract

Early epileptic encephalopathy-66 was first diagnosed in a male patient from Russia using whole-exome sequencing. Early epileptic encephalopathy- 66 is a unique disorder in the group of early epileptic encephalopathies. The same recurrent heterozygous variant of the nucleotide sequence was found in all known patients, but the severity of seizures and dysmorphic signs significantly vary between patients. The current study of a recurrent pathogenic variant in PACS2 gene expands the phenotype spectrum of early epileptic encephalopathy-66 and will improve the management of patients with that disorder in Russia in the future.

About the authors

T. V. Markova

Research Center of Medical Genetics named after academician N. P. Bochkov

Email: fake@neicon.ru
ORCID iD: 0000-0002-2672-6294
1 Moskvorech’e St., Moscow 115478, Russia Russian Federation

A. O. Borovikov

Research Center of Medical Genetics named after academician N. P. Bochkov

Email: fake@neicon.ru
ORCID iD: 0000-0001-5871-8005
1 Moskvorech’e St., Moscow 115478, Russia Russian Federation

E. R. Lozier

Independent Clinical Bioinformatics Laboratory

Email: fake@neicon.ru
ORCID iD: 0000-0003-2901-0539
Build. 1, 21 Katukova St., Moscow 123181, Russia Russian Federation

A. A. Isaev

Center for Genetics and Reproductive Medicine “Genetico”

Email: fake@neicon.ru
Build. 1, 3 Gubkina St., Moscow 119333, Russia Russian Federation

V. S. Kaimonov

Center for Genetics and Reproductive Medicine “Genetico”

Email: fake@neicon.ru
ORCID iD: 0000-0001-9024-0785
Build. 1, 3 Gubkina St., Moscow 119333, Russia Russian Federation

E. A. Pomerantseva

Center for Genetics and Reproductive Medicine “Genetico”

Email: fake@neicon.ru
Build. 1, 3 Gubkina St., Moscow 119333, Russia Russian Federation

F. A. Konovalov

Independent Clinical Bioinformatics Laboratory

Email: fake@neicon.ru
ORCID iD: 0000-0001-6414-436X
Build. 1, 21 Katukova St., Moscow 123181, Russia Russian Federation

O. A. Schagina

Research Center of Medical Genetics named after academician N. P. Bochkov

Email: fake@neicon.ru
ORCID iD: 0000-0003-4905-1303
Moskvorech’e St., Moscow 115478, Russia Russian Federation

E. L. Dadali

Research Center of Medical Genetics named after academician N. P. Bochkov

Author for correspondence.
Email: genclinic@yandex.ru
ORCID iD: 0000-0001-5602-2805
Moskvorech’e St., Moscow 115478, Russia Russian Federation

References

  1. Trump N., McTague A., Brittain H. et al. Improving diagnosis and broadening the phenotypes in early-onset seizure and severe developmental delay disorders through gene panel analysis. J Med Genet 2016;53(5):310–7. doi: 10.1136/jmedgenet-2015-103263. PMID: 26993267.
  2. Thevenon J., Duffourd Y., Masurel-Paulet A. et al. Diagnostic odyssey in severe neurodevelopmental disorders: toward clinical whole-exome sequencing as a first-line diagnostic test. Clin Genet 2016;89(6): 700–7. doi: 10.1111/cge.12732. PMID: 26757139.
  3. Olson H.E., Jean-Marcais N., Yang E. et al. A recurrent de novo PACS2 heterozygous missense variant causes neonatal-onset developmental epileptic encephalopathy, facial dysmorphism, and cerebellar dysgenesis. Am J Hum Genet 2018;103(4):631. doi: 10.1016/j.ajhg.2018.09.002. PMID: 30290155.
  4. Simmen T., Aslan J.E., Blagoveshchenskaya A.D. et al. PACS-2 controls endoplasmic reticulum-mitochondria communication and Bid-mediated apoptosis. EMBO J 2005;24(4):717–29. doi: 10.1038/sj.emboj.7600559. PMID: 15692567.
  5. Youker R.T., Shinde U., Day R. et al. At the crossroads of homoeostasis and disease: roles of the PACS proteins in membrane traffic and apoptosis. Biochem J 2009;421:1–15. doi: 10.1042/Bj20081016. PMID: 19505291.
  6. Perucca P., Perucca E. Identifying mutations in epilepsy genes: Impact on treatment selection. Epilepsy Res 2019;152:18–30. doi: 10.1016/j.eplepsyres.2019.03.001. PMID: 30870728.
  7. Dentici M.L., Barresi S., Niceta M. et al. Expanding the clinical spectrum associated with PACS2 mutations. Clin Genet 2019;95(4):525–31. doi: 10.1111/cge.13516. PMID: 30684285.
  8. Zollino M., Seminara L., Orteschi D. et al. The ring 14 syndrome: clinical and molecular definition. Am J Med Genet A 2009;149A(6):1116–24. doi: 10.1002/ajmg.a.32831. PMID: 19441122.
  9. Holder J.L.Jr., Lotze T.E., Bacino C., Cheung S.W. A child with an inherited 0.31 Mb microdeletion of chromosome 14q32.33: further delineation of a critical region for the 14q32 deletion syndrome. Am J Med Genet A 2012;158A(8):1962–6. doi: 10.1002/ajmg.a.35289. PMID: 22488736.
  10. Helbig I., Lopez-Hernandez T., Shor O. et al. A recurrent missense variant in AP2M1 impairs clathrin-mediated endocytosis and causes developmental and epileptic encephalopathy. Am J Hum Genet 2019;104(6):1060–72. doi: 10.1016/j.ajhg.2019.04.001. PMID: 31104773.

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2020 Markova T.V., Borovikov A.O., Lozier E.R., Isaev A.A., Kaimonov V.S., Pomerantseva E.A., Konovalov F.A., Schagina O.A., Dadali E.L.

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

СМИ зарегистрировано Федеральной службой по надзору в сфере связи, информационных технологий и массовых коммуникаций (Роскомнадзор).
Регистрационный номер и дата принятия решения о регистрации СМИ: серия ЭЛ № ФС 77 - 85909 от  25.08.2023.