title: Infantile Alexander disease: spectrum of GFAP mutations and genotype-phenotype correlation.
abstract: Heterozygous, de novo mutations in the glial fibrillary acidic protein (GFAP) gene have recently been reported in 12 patients affected by neuropathologically proved Alexander disease. We searched for GFAP mutations in a series of patients who had heterogeneous clinical symptoms but were candidates for Alexander disease on the basis of suggestive neuroimaging abnormalities. Missense, heterozygous, de novo GFAP mutations were found in exons 1 or 4 for 14 of the 15 patients analyzed, including patients without macrocephaly. Nine patients carried arginine mutations (four had R79H; four had R239C; and one had R239H) that have been described elsewhere, whereas the other five had one of four novel mutations, of which two affect arginine (2R88C and 1R88S) and two affect nonarginine residues (1L76F and 1N77Y). All mutations were located in the rod domain of GFAP, and there is a correlation between clinical severity and the affected amino acid. These results confirm that GFAP mutations are a reliable molecular marker for the diagnosis of infantile Alexander disease, and they also form a basis for the recommendation of GFAP analysis for prenatal diagnosis to detect potential cases of germinal mosaicism.
authors.affiliation: Laboratoire de Neurogénétique Moléculaire, INSERM U546, Université Paris VI, France. Diana.Rodriguez@snv.jussieu.fr
authors.forename: D
authors.initials: D
authors.lastname: Rodriguez
authors.forename: F
authors.initials: F
authors.lastname: Gauthier
authors.forename: E
authors.initials: E
authors.lastname: Bertini
authors.forename: M
authors.initials: M
authors.lastname: Bugiani
authors.forename: M
authors.initials: M
authors.lastname: Brenner
authors.forename: S
authors.initials: S
authors.lastname: N'guyen
authors.forename: C
authors.initials: C
authors.lastname: Goizet
authors.forename: A
authors.initials: A
authors.lastname: Gelot
authors.forename: R
authors.initials: R
authors.lastname: Surtees
authors.forename: J M
authors.initials: JM
authors.lastname: Pedespan
authors.forename: X
authors.initials: X
authors.lastname: Hernandorena
authors.forename: M
authors.initials: M
authors.lastname: Troncoso
authors.forename: G
authors.initials: G
authors.lastname: Uziel
authors.forename: A
authors.initials: A
authors.lastname: Messing
authors.forename: G
authors.initials: G
authors.lastname: Ponsot
authors.forename: D
authors.initials: D
authors.lastname: Pham-Dinh
authors.forename: A
authors.initials: A
authors.lastname: Dautigny
authors.forename: O
authors.initials: O
authors.lastname: Boespflug-Tanguy
mesh_terms: D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D001483:Base Sequence; D001921:Brain / Q000002:abnormalities / Q000378:metabolism; D001927:Brain Diseases / Q000235:genetics* / Q000401:mortality / Q000473:pathology / Q000503:physiopathology*; D002648:Child; D002675:Child, Preschool; D005091:Exons / Q000235:genetics; D005838:Genotype; D005904:Glial Fibrillary Acidic Protein / Q000737:chemistry / Q000235:genetics*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008279:Magnetic Resonance Imaging; D009030:Mosaicism / Q000235:genetics; D009154:Mutation / Q000235:genetics*; D010641:Phenotype; D017434:Protein Structure, Tertiary; D012640:Seizures / Q000150:complications / Q000235:genetics / Q000473:pathology / Q000503:physiopathology
chemical_list: D005904:Glial Fibrillary Acidic Protein