Truncating GAS6 Variant Disrupts Neuroglial Homeostasis in a Childhood-Onset Demyelinating Disorder

Area of Science:

• Neuroscience
• Genetics
• Cell Biology

Background:

• Growth arrest-specific 6 (GAS6) is vital for cell survival via TAM receptor signaling.
• Demyelinating disorders can cause severe neurological deficits.

Purpose of the Study:

• Investigate a novel autosomal recessive demyelinating disorder in a pediatric patient.
• Identify the genetic cause and underlying molecular mechanisms of the disease.

Main Methods:

• Exome sequencing to identify genetic variants.
• Functional assays using patient fibroblasts and HOG oligodendrocytes.
• MRI analysis to characterize brain abnormalities.

Main Results:

• A homozygous stop-gain variant (c.444G>A; p.Trp148Ter) in GAS6 was identified.
• The variant led to GAS6 loss-of-function, affecting neurotrophic and myelin-related genes.
• Defective oligodendrocyte development and increased cell cycle arrest were observed.

Conclusions:

• GAS6 is crucial for neuro-glial homeostasis.
• GAS6 deficiency is the cause of this previously unreported childhood-onset demyelinating disease.