Hereditary Hyperekplexia in Saudi Arabia.

Area of Science:

• Genetics
• Neurology
• Epidemiology

Background:

• Hyperekplexia is a rare neurological disorder causing exaggerated startle responses, apnea, and stiffness.
• Limited research exists on hyperekplexia in consanguineous populations.

Purpose of the Study:

• To investigate the epidemiology and clinical characteristics of hereditary hyperekplexia in Saudi patients.
• To classify genetic subtypes and determine carrier frequencies in the Saudi population.

Main Methods:

• Retrospective review of genetically confirmed hereditary hyperekplexia cases in Saudi Arabia.
• Data collected via questionnaires from nine major referral hospitals.
• Molecular studies to classify patients into subtypes based on genetic variants.

Main Results:

• 22 Saudi patients from 20 families were identified with hereditary hyperekplexia.
• Subtypes identified: SLC6A5 (54.5%), GLRB (31.8%), and GLRA1 (13.7%) variants.
• Carrier frequency for founder mutations is 10.9 per 10,000, with a disease burden of 13 per 1,000,000.

Conclusions:

• This study offers comprehensive epidemiologic data and prevalence figures for hereditary hyperekplexia in a large Saudi cohort.
• Provides essential clinical characteristics and genetic subtype information for hereditary hyperekplexia.