Alexander Disease: A Literature Review for Clinicians

Area of Science:

• Neurogenetics
• Molecular Neurology
• Rare Diseases

Background:

• Alexander disease (ALEXD) is a rare, fatal leukodystrophy characterized by mutations in the Glial Fibrillary Acidic Protein (GFAP) gene.
• It presents a wide spectrum of clinical heterogeneity, with phenotypes ranging from neonatal to adult-onset forms.

Purpose of the Study:

• To provide an updated review of Alexander disease, covering clinical, radiologic, genetic, and molecular aspects.
• To highlight the diagnostic challenges and evolving therapeutic strategies for ALEXD.

Main Methods:

• Literature review of Alexander disease clinical presentations, genetic basis, and molecular mechanisms.
• Analysis of diagnostic criteria, including neuroimaging and genetic testing.
• Overview of current supportive care and emerging gene-targeted therapies.

Main Results:

• Over 100 GFAP mutations are linked to ALEXD, causing astrocyte dysfunction and Rosenthal fiber formation.
• Diagnosis relies on characteristic MRI findings and GFAP mutation confirmation, though genotype-phenotype correlations are still being established.
• Elevated GFAP levels in cerebrospinal fluid are a potential biomarker, requiring further investigation.

Conclusions:

• Alexander disease exhibits significant phenotypic variability, complicating diagnosis due to overlap with other neurological disorders.
• Emerging gene therapies, such as antisense oligonucleotides and AAV-mediated gene silencing, offer potential for targeted treatment.
• Continued research is crucial for refining diagnostic accuracy and developing effective therapies for ALEXD.