Fabry disease

• Published in: Orphanet journal of rare diseases 2010-11, Vol.5 (1), p.30-30
• Main Author: Germain, Dominique P
• Format: Article
• Language: English
• Subjects: Adult; alpha-Galactosidase - analysis; alpha-Galactosidase - genetics; alpha-Galactosidase - therapeutic use; Cardiovascular Diseases - genetics; Cardiovascular Diseases - physiopathology; Care and treatment; Case studies; Child; Child, Preschool; Children & youth; Chromosomes, Human, X - genetics; Diagnosis; Enzyme Replacement Therapy; Fabry Disease - diagnosis; Fabry Disease - genetics; Fabry Disease - physiopathology; Fabry Disease - therapy; Fabry's disease; Family medical history; Female; Females; Fever; Genes; Genotype & phenotype; Humans; Irritable bowel syndrome; Kidney - pathology; Kidney Diseases - genetics; Kidney Diseases - pathology; Kidney Diseases - physiopathology; Male; Medical research; Medical screening; Mutation; Pain; Proteins; Quality of life; Randomized Controlled Trials as Topic; Rare diseases; Review; Risk factors; Standard deviation
• ISSN: 1750-1172; 1750-1172
• DOI: 10.1186/1750-1172-5-30

Fabry disease (FD) is a progressive, X-linked inherited disorder of glycosphingolipid metabolism due to deficient or absent lysosomal α-galactosidase A activity. FD is pan-ethnic and the reported annual incidence of 1 in 100,000 may underestimate the true prevalence of the disease. Classically affected hemizygous males, with no residual α-galactosidase A activity may display all the characteristic neurological (pain), cutaneous (angiokeratoma), renal (proteinuria, kidney failure), cardiovascular (cardiomyopathy, arrhythmia), cochleo-vestibular and cerebrovascular (transient ischemic attacks, strokes) signs of the disease while heterozygous females have symptoms ranging from very mild to severe. Deficient activity of lysosomal α-galactosidase A results in progressive accumulation of globotriaosylceramide within lysosomes, believed to trigger a cascade of cellular events. Demonstration of marked α-galactosidase A deficiency is the definitive method for the diagnosis of hemizygous males. Enzyme analysis may occasionnally help to detect heterozygotes but is often inconclusive due to random X-chromosomal inactivation so that molecular testing (genotyping) of females is mandatory. In childhood, other possible causes of pain such as rheumatoid arthritis and 'growing pains' must be ruled out. In adulthood, multiple sclerosis is sometimes considered. Prenatal diagnosis, available by determination of enzyme activity or DNA testing in chorionic villi or cultured amniotic cells is, for ethical reasons, only considered in male fetuses. Pre-implantation diagnosis is possible. The existence of atypical variants and the availability of a specific therapy singularly complicate genetic counseling. A disease-specific therapeutic option - enzyme replacement therapy using recombinant human α-galactosidase A - has been recently introduced and its long term outcome is currently still being investigated. Conventional management consists of pain relief with analgesic drugs, nephroprotection (angiotensin converting enzyme inhibitors and angiotensin receptors blockers) and antiarrhythmic agents, whereas dialysis or renal transplantation are available for patients experiencing end-stage renal failure. With age, progressive damage to vital organ systems develops and at some point, organs may start to fail in functioning. End-stage renal disease and life-threatening cardiovascular or cerebrovascular complications limit life-expectancy of untreated males and females with reductions of 2