GOSR2: a progressive myoclonus epilepsy gene

Area of Science:

• Genetics
• Neuroscience
• Cell Biology

Background:

• GOSR2-associated progressive myoclonic epilepsy (PME) is a rare genetic disorder.
• It is characterized by a specific homozygous mutation in the GOSR2 gene, which encodes a Golgi vesicle transport protein.

Purpose of the Study:

• To detail the genetic basis and functional consequences of the GOSR2 mutation.
• To describe the clinical phenotype and disease course of GOSR2-associated PME.
• To contribute to the understanding of this rare condition.

Main Methods:

• Genetic analysis to identify the GOSR2 mutation (c.430G>T, p.Gly144Trp).
• Functional studies to assess the impact of the mutation on GOSR2 protein localization and function.
• Clinical case description and analysis of patient data.

Main Results:

• The identified GOSR2 mutation leads to a loss-of-function, preventing protein localization to the cis-Golgi.
• Key clinical features include early-onset ataxia, areflexia, action myoclonus, seizures, scoliosis, and elevated creatine kinase.
• Patients exhibit relative cognitive preservation until late stages, with a relentless disease progression and severe photosensitive myoclonus.

Conclusions:

• The homozygous GOSR2 mutation is causative for this PME subtype.
• Understanding the GOSR2 protein's role in Golgi transport is crucial for PME pathogenesis.
• Further patient identification is needed to expand the known phenotype and genotype spectrum of GOSR2-associated PME.