Spontaneous seizure and partial lethality of juvenile Shank3-overexpressing mice in C57BL/6 J background

Chunmei Jin, Yinhua Zhang, Shinhyun Kim, Yoonhee Kim, Yeunkum Lee, Kihoon Han

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The SH3 and multiple ankyrin repeat domains 3 (SHANK3) gene encodes core scaffolds in neuronal excitatory postsynapses. SHANK3 duplications have been identified in patients with hyperkinetic disorders and early-onset generalized tonic-clonic seizures. Consistently, Shank3 transgenic (TG) mice, which mildly overexpress Shank3 proteins exhibit hyperkinetic behavior and spontaneous seizures. However, the seizure phenotype of Shank3 TG mice has only been investigated in adults of the seizure-sensitive strain FVB/N. Therefore, it remains unknown if spontaneous seizures occur in Shank3 TG mice from the early postnatal stages onward, or even in seizure-resistant strains. Clinically, generalized tonic-clonic seizures are the critical risk factor for epilepsy-associated mortality. However, the potential association between Shank3 overexpression and mortality, at least in mice, has not been investigated in detail. In the present study, we backcrossed Shank3 TG mice in seizure-resistant C57BL/6 J strain and monitored their home-cage activities at 3 weeks of age. Of the 15 Shank3 TG mice monitored, two exhibited spontaneous tonic-clonic seizures, and one died immediately after the seizure event. Based on this observation, we determined the survival rate of the Shank3 TG mice from 3 to 12 weeks of age. We found that approximately 40-45% of the Shank3 TG mice, both males and females, died before reaching 12 weeks of age. Notably, 53% and 70% of the total deaths in male and female Shank3 TG mice, respectively, occurred in the juvenile stages. These results suggest spontaneous seizure and partial lethality of juvenile Shank3 TG mice in seizure-resistant background, further supporting the validity of this model.

Original languageEnglish
Article number57
JournalMolecular brain
Volume11
Issue number1
DOIs
Publication statusPublished - 2018 Oct 10

Keywords

  • Juvenile stage
  • Lethality
  • Shank3 overexpression
  • Spontaneous seizure

ASJC Scopus subject areas

  • Molecular Biology
  • Cellular and Molecular Neuroscience

Fingerprint Dive into the research topics of 'Spontaneous seizure and partial lethality of juvenile Shank3-overexpressing mice in C57BL/6 J background'. Together they form a unique fingerprint.

  • Cite this