DYNC1H1 variant associated with epilepsy: Expanding the phenotypic spectrum

Area of Science:

• Genetics
• Neurology
• Molecular Biology

Background:

• The DYNC1H1 gene encodes a component of the cytoplasmic dynein motor complex, crucial for intracellular transport.
• DYNC1H1 variants are primarily known for causing peripheral neuropathy and brain abnormalities, leading to neurodevelopmental delay.
• The association between DYNC1H1 variants and epilepsy remains under-explored.

Observation:

• A case of drug-resistant focal epilepsy was identified in association with a pathogenic DYNC1H1 variant.
• A literature review was conducted to collate clinical, genetic, and neuroimaging data from patients with DYNC1H1 variant-associated epilepsy.
• The study observed that DYNC1H1-related epilepsy often presents with early onset.

Findings:

• Pathogenic DYNC1H1 variants can manifest as early-onset epilepsy, frequently co-occurring with neurodevelopmental delay and intellectual disability.
• Malformations of cortical development are a common neuroimaging finding in patients with DYNC1H1 variant-associated epilepsy.
• Associated clinical features include neuromuscular, ophthalmic, and orthopedic involvement, broadening the phenotypic spectrum.

Implications:

• This research expands the understanding of DYNC1H1-related disorders, specifically identifying epilepsy as a significant clinical manifestation.
• The findings suggest that genetic testing for DYNC1H1 variants should be considered in individuals with early-onset epilepsy and neurodevelopmental abnormalities.
• Further research into the molecular mechanisms linking DYNC1H1 dysfunction to epileptogenesis is warranted.