Hyperekplexia in Patients With CTNNB1 Mutation

Completed

• Conditions: Hyperekplexia; CTNNB1 Gene Mutation
• Interventions: Other: Questionnaire

• Registration Number: NCT05168969
• Lead Sponsor: Centre Hospitalier Universitaire de Saint Etienne

Brief Summary

A few years ago, a new genetic disorder (OMIM # 615075) has been associated with loss-of-function variations in the CTNNB1 gene. The clinical features include a delayed psychomotor development usually leading to severe intellectual disability with or without autistic spectrum disorders, progressive spastic diplegia, and various visual defects. Among over 30 cases described worldwide, 2 were reported with an exaggerated startle response to sudden stimulus corresponding to a very rare neurological phenomenon called hyperekplexia. The investigators also have a 3rd patient carrying a CTNNB1 syndrome associated with hyperekplexia.

Detailed Description

Hyperekplexia can impair daily life because the affected person will fall unexpectedly and stiffly, causing repeated head- or body- wounds. It may be treated empirically by various drugs. Hyperekplexia has so far not been associated with CTNNB1 variations.

In this study, we aim to describe the prevalence and clinical characteristics of hyperekplexia in CTNNB1 syndrome carriers, in order to improve diagnosis and thus treatment.

The investigators will recruit CTNNB1 subjects through health care providers and also by contacting the families through dedicated social media and databases. The families and health care providers will be invited to fill in a questionnaire related to hyperekplexia (clinical, pharmacological, and genetic data).

Study Timeline

• Study First Submitted: 2021-12-10
• Study First Submitted QC: 2021-12-10
• Study First Posted: 2021-12-23
• Study Start: 2022-07-02
• Primary Completion: 2022-12-10
• Study Completion: 2022-12-10
• Status Verified: 2023-04
• Last Update Submitted: 2023-04-24
• Last Update Posted: 2023-04-25

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 10

Inclusion Criteria

• Patient carrying a CTNNB1 syndrome showing an exaggerated startle response
• child whose parents have signed a consent form to participate in the study

Exclusion Criteria

• Absence of molecular diagnosis
• Refusal to participate

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Patient carrying a CTNNB1 syndrome	Questionnaire	Recruitment of subjects with CTNNB1 syndrome will be done through health care providers, but also by contacting families through social media and specialized databases.

Primary Outcome Measures

Name	Time	Method
Prevalence of hyperekplexia in CTNNB1 subjects	on the day of filling in the questionnaire	Number of children with hyperekplexia and CTNNB1 syndrome

Secondary Outcome Measures

Name	Time	Method
Clinical features of hyperekplexia	on the day of filling in the questionnaire	Clinical features (developmental, neurological, and visual disorders) of hyperekplexia in CTNNB1 syndrome

Trial Locations

Locations (1)

Chu Saint-Etienne; 🇫🇷 Saint-Étienne, France