Hypomyelinating leukodystrophy associated with a deleterious mutation in the ATRN gene

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• Hypomyelinating leukodystrophies are neurodevelopmental disorders impacting central nervous system myelin sheath formation.
• Clinical features include developmental delay, hypotonia, spasticity, and intellectual disability.

Purpose of the Study:

• To investigate the molecular basis of hypomyelinating leukodystrophy in a consanguineous family.
• To identify the specific gene mutation responsible for the disorder in affected siblings.

Main Methods:

• Whole exome sequencing was performed on two affected siblings.
• Homozygous mutation analysis was conducted to pinpoint the genetic cause.

Main Results:

• A homozygous mutation (c.3068+5G>A) was identified in the ATRN gene.
• This mutation leads to intronic sequence insertion and predicted premature termination of the Attractin (ATRN) polypeptide.
• ATRN is crucial for central nervous system myelination, and its dysfunction is linked to impaired myelination in rodent models.

Conclusions:

• ATRN is implicated as a causative gene for hypomyelinating leukodystrophy.
• The identified mutation provides new insight into the genetic heterogeneity of these disorders.
• Further long-term follow-up is necessary to fully understand the disease course in patients.