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The official name of this gene is “glial fibrillary acidic protein.”
GFAP is the gene's official symbol. The GFAP gene is also known by other names, listed below.
The GFAP gene provides instructions for making a protein called glial fibrillary acidic protein. This protein is a member of the intermediate filament family of proteins. Intermediate filaments form networks that provide support and strength to cells. Several molecules of glial fibrillary acidic protein bind together to form the type of intermediate filament found in astroglial cells. Astroglial cells support and nourish cells in the brain and spinal cord. If brain or spinal cord cells are injured through trauma or disease, astroglial cells react by rapidly producing more glial fibrillary acidic protein.
Although its function is not fully understood, glial fibrillary acidic protein is probably involved in controlling the shape, movement, and function of astroglial cells. Some researchers have suggested that astroglial cells play an important role in the functioning of other cells, including specialized cells that surround nerves (oligodendrocytes) and are involved in the production and long-term maintenance of myelin. Myelin is the fatty substance that forms a protective coating around certain nerve cells and ensures the rapid transmission of nerve impulses. Additionally, astroglial cells may assist in maintaining the protective barrier that allows only certain substances to pass between blood vessels and the brain (the blood-brain barrier).
Researchers have identified more than 50 GFAP mutations that cause Alexander disease. Most of these mutations change one of the building blocks (amino acids) used to make glial fibrillary acidic protein. A few mutations add or remove two amino acids in the protein. All of these changes alter the structure of glial fibrillary acidic protein. The altered protein probably disturbs the formation of normal intermediate filaments. As a result, the abnormal glial fibrillary acidic protein may accumulate in astroglial cells, contributing to the formation of Rosenthal fibers, which impair cell function. It is not well understood how impaired astroglial cells contribute to the abnormal maintenance of myelin, causing the signs and symptoms of Alexander disease.
Cytogenetic Location: 17q21
Molecular Location on chromosome 17: base pairs 44,905,625 to 44,915,551
The GFAP gene is located on the long (q) arm of chromosome 17 at position 21.
More precisely, the GFAP gene is located from base pair 44,905,625 to base pair 44,915,551 on chromosome 17.
See How do geneticists indicate the location of a gene? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genelocation) in the Handbook.
You and your healthcare professional may find the following resources about GFAP helpful.
You may also be interested in these resources, which are designed for genetics professionals and researchers.
See How are genetic conditions and genes named? (http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/naming) in the Handbook.
acids ; blood-brain barrier ; cell ; fibrillary ; gene ; intermediate filaments ; oligodendrocytes ; protein ; trauma
You may find definitions for these and many other terms in the Genetics Home Reference Glossary (http://ghr.nlm.nih.gov/glossary).
The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.