Related Experiment Video
Updated: Aug 30, 2026
Experimental Approaches for Biochemical Analysis of Glial Fibrillary Acidic Protein and Its Disease-associated Variants
Published on: November 28, 2025
Alexander's disease: clinical, pathologic, and genetic features
Anne B Johnson1, Michael Brenner
1Department of Pathology-K604, Albert Einstein College of Medicine, 1300 Morris Park Ave., Bronx, NY 10461, USA. abminkoff@att.net
Insights
Alexander disease is a rare neurological disorder affecting all ages, characterized by developmental issues and seizures in infants. Genetic mutations in the glial fibrillary acidic protein gene are now a key diagnostic marker.
Area of Science:
- Neuroscience
- Genetics
- Pediatric Neurology
Background:
- Alexander disease is a rare, fatal central nervous system disorder.
- It presents with varied symptoms across different age groups, from infancy to adulthood.
- Characteristic neuropathological findings include Rosenthal fibers in brain tissue.
Purpose of the Study:
- To summarize the clinical manifestations and diagnostic features of Alexander disease.
- To highlight the role of genetic mutations in the diagnosis and understanding of the disease.
- To provide an overview of Alexander disease across different age demographics.
Main Methods:
- Review of clinical case presentations across infants, children, and adults.
- Analysis of neuroimaging findings, particularly magnetic resonance imaging (MRI).
- Examination of neuropathological hallmarks, specifically Rosenthal fibers.
- Genetic analysis to identify mutations in the glial fibrillary acidic protein (GFAP) gene.
Main Results:
- Infantile and juvenile forms present with developmental delay, psychomotor retardation, seizures, and often megalencephaly.
- Adult forms exhibit variable symptoms, sometimes mimicking multiple sclerosis, and may include palatal myoclonus.
- Consistently identified are Rosenthal fibers in brain tissue across all age groups.
- Heterozygous missense point mutations in the GFAP gene are found in nearly all cases, serving as a diagnostic tool.
Conclusions:
- Alexander disease is a genetically defined disorder linked to GFAP mutations.
- The identification of GFAP mutations provides a significant diagnostic advancement.
- Understanding the varied clinical presentations is crucial for accurate diagnosis and management.
Abstract:
Alexander's disease, a rare and fatal disorder of the central nervous system, most commonly affects infants and young children but can also occur in older children and sometimes adults. In infants and young children, it causes developmental delay, psychomotor retardation, paraparesis, feeding problems, usually megalencephaly, often seizures, and sometimes hydrocephalus. Juvenile cases often do not have megalencephaly and tend to have predominant pseudobulbar and bulbar signs. In both groups, characteristic magnetic resonance imaging findings have been described. In adult cases, the signs are variable, can resemble multiple sclerosis, and might include palatal myoclonus. In all cases, the examination of brain tissue shows the presence of widely distributed Rosenthal fibers. Almost all cases have recently been found to have a heterozygous, missense, point mutation in the gene for glial fibrillary acidic protein, which provides a new diagnostic tool. In most cases, the mutation appears to occur de novo, not being present in either parent, but some adult cases are familial.
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