ZFIN ID: ZDB-PUB-170909-11
Aggregation-prone GFAP mutation in Alexander disease validated using a zebrafish model
Lee, S.H., Nam, T.S., Kim, K.H., Kim, J.H., Yoon, W., Heo, S.H., Kim, M.J., Shin, B.A., Perng, M.D., Choy, H.E., Jo, J., Kim, M.K., Choi, S.Y.
Date: 2017
Source: BMC neurology   17: 175 (Journal)
Registered Authors: Choi, Seok-Yong, Kim, Min Jung, Lee, So-Hyun
Keywords: Alexander disease, Astrocyte, GFAP, Glial fibrillary acidic protein, Leukodystrophy, Rosenthal fibers, Zebrafish
MeSH Terms:
  • Aged
  • Alexander Disease/genetics*
  • Animals
  • Astrocytes
  • Glial Fibrillary Acidic Protein/genetics*
  • Glial Fibrillary Acidic Protein/metabolism
  • Humans
  • Male
  • Mutation
  • Zebrafish
PubMed: 28882119 Full text @ BMC Neurol
Alexander disease (AxD) is an astrogliopathy that predominantly affects the white matter of the central nervous system (CNS), and is caused by a mutation in the gene encoding the glial fibrillary acidic protein (GFAP), an intermediate filament primarily expressed in astrocytes and ependymal cells. The main pathologic feature of AxD is the presence of Rosenthal fibers (RFs), homogeneous eosinophilic inclusions found in astrocytes. Because of difficulties in procuring patient' CNS tissues and the presence of RFs in other pathologic conditions, there is a need to develop an in vivo assay that can determine whether a mutation in the GFAP results in aggregation and is thus disease-causing.
We found a GFAP mutation (c.382G > A, p.Asp128Asn) in a 68-year-old man with slowly progressive gait disturbance with tendency to fall. The patient was tentatively diagnosed with AxD based on clinical and radiological findings. To develop a vertebrate model to assess the aggregation tendency of GFAP, we expressed several previously reported mutant GFAPs and p.Asp128Asn GFAP in zebrafish embryos.
The most common GFAP mutations in AxD, p.Arg79Cys, p.Arg79His, p.Arg239Cys and p.Arg239His, and p.Asp128Asn induced a significantly higher number of GFAP aggregates in zebrafish embryos than wild-type GFAP.
The p.Asp128Asn GFAP mutation is likely to be a disease-causing mutation. Although it needs to be tested more extensively in larger case series, the zebrafish assay system presented here would help clinicians determine whether GFAP mutations identified in putative AxD patients are disease-causing.