Gene/Protein Disease Symptom Drug Enzyme Compound
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Fabry's disease is an X-linked lysosomal storage disorder caused by abnormalities in the GLA gene, which leads to a deficiency in alpha-galactosidase A. The consequent abnormal accumulation of glycosphingolipids results in several clinical signs and symptoms and substantial morbidity and mortality. This review covers all basic aspects of the disease such as epidemiology, pathophysiology, clinical presentation by systems, diagnosis, management, prevention, and repercussions on quality of life. With the development of enzyme replacement therapy in the past few years, early initiation of treatment is key for improvement in major affected organs with decreased cardiac mass and stabilisation of kidney function, and improvement in neuropathic pain, sweating, gastrointestinal symptoms, hearing loss, and pulmonary symptoms. However, treatment of individual symptoms in addition to enzyme replacement therapy seems to be needed for many patients, especially those who have had some degree of organ dysfunction. Additional data are needed to document long-term treatment outcomes.
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PMID:Fabry's disease. 1894 Apr 66

Fabry disease is a rare inherited lysosomal storage disorder caused by the partial or complete deficiency of the lysosomal enzyme alpha galactosidase A (alpha-Gal A), resulting in excess cellular glycosphingolipid deposition. Accumulation of the neutral glycosphingolipid globotriaosyl-ceramide predominates and involves small blood vessels, nerves, dorsal root ganglia, renal glomerular, and tubular epithelial cells and cardiomyocytes. Disease transmission is X-linked, therefore it predominantly affects males and females as asymptomatic carriers. However, females may also develop symptomatic disease of varying severity. Glycosphingolipid deposition in various tissues leads to episodic pain crises and acroparesthesias, gastrointestinal disturbances, angiokeratomas, corneal, and lenticular opacities, and eventually in the third to fifth decades of life, the kidney, heart and central nervous system are involved. Cardiac involvement is usually part of the multisystem disorder and presents in the fourth decade with other organ manifestations; however, a variant of Fabry disease with predominant cardiac manifestations has also been recognized. Patients may present with angina pectoris, dyspnea, palpitations, or syncope, and these symptoms are due to vascular, endothelial, myocardial (with increase in left ventricular mass), and conduction system involvement. Advanced cardiac disease may require a permanent pacemaker and cardiac transplant. Substrate inhibition with enzyme replacement therapy and gene therapy instituted early in the disease course might slow progression of the cardiac manifestations.
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PMID:Fabry disease: cardiac manifestations and therapeutic options. 1909 68

Fabry disease is a rare, X-linked inborn error of glycosphingolipid catabolism caused by a deficiency in the activity of the lysosomal enzyme, alpha-galactosidase A. In affected patients, the enzyme substrate, globotriaosylceramide (Gb3), accumulates in cells of various tissues and organs. Lysosomal accumulation of Gb3 begins in utero, and signs and symptoms of Fabry disease emerge in childhood and adolescence. The earliest presenting symptoms are typically neuropathic pain and gastrointestinal problems, which can have a substantial impact on health-related quality of life. Life-threatening major organ involvement is rare in young patients, but signs of kidney dysfunction (e.g., proteinuria), left ventricular hypertrophy, and stroke have been reported in children. There are two enzyme preparations for therapy: agalsidase alfa and beta. In two clinical trials of enzyme replacement therapy (ERT) with agalsidase alfa, including 37 children, boys demonstrated reductions in plasma Gb3 levels, and both boys and girls reported reductions in neuropathic pain and in the use of neuropathic pain medications. Heart rate variability, which is reduced in boys with Fabry disease, was statistically significantly improved with 6 months of agalsidase alfa treatment. In a single clinical study of agalsidase beta in children (n =16), skin Gb3 deposits and plasma Gb3 levels were reduced in boys. Differences exist in the administration and the safety profile of these two enzyme formulations. Follow-up of these cohorts and additional studies will be necessary to fully evaluate long-term efficacy of ERT in children with Fabry disease.
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PMID:Fabry disease in children and the effects of enzyme replacement treatment. 1924 21

Fabry disease is a X-linked lysosomal storage disorder. Two preparations of the enzyme alpha-galactosidase A are available in Europe since 2001: agalsidase alpha and agalsidase beta. Clinical evidence of efficacy are mandatory considering the absence of a robust biomarker. A literature review was performed to assess the clinical efficacy of these two enzyme replacement therapies. Only open or randomised controlled trials were considered. No unflawed direct comparison exists between the two drugs. Significant clinical benefits have been demonstrated with enzyme replacement therapy (ERT), mainly at an early phase of the disease, with positive effects on heart, kidneys, pain, and quality of life. Further prospective studies are required to confirm the long term clinical benefits of ERT. More specific studies are also needed in women or with ERT earlier in the course of Fabry disease to assess prevention of organ damage.
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PMID:[Clinical efficacy of enzyme replacement therapy in Fabry disease. A critical review]. 1952 34

Fabry disease is an X-linked inherited lysosomal disorder with dysfunction of the lysosomal enzyme alpha-galactosidase A causing accumulation of glycolipids in multiple organs including the nervous system. Pain and somatosensory disturbances are prominent manifestations of this disease. Until recently disease manifestations in female carriers of Fabry disease have been questioned. To explore the frequency of symptoms and the functional and structural involvement of the nervous system in female patients we examined the presence of pain, manifestations of peripheral neuropathy and nerve density in skin biopsies in 19 female patients with Fabry disease and 19 sex- and age-matched controls. Diaries, quantitative sensory testing, neurophysiologic tests and skin biopsies were performed. Daily pain was present in 63% of patients, with a median VAS score of 4.0. Tactile detection threshold and pressure pain threshold were lower and cold detection thresholds increased in patients. Sensory nerve action potential amplitude and maximal sensory conduction velocity were not different, whereas there was a highly significant reduction in intraepidermal nerve fiber density. We found no correlation between pain VAS score, quantitative sensory testing and intraepidermal nerve fiber density. Our study demonstrates that careful evaluation of symptoms in female Fabry patients is important as small fiber disease manifestations are present, which in some cases is only detected by skin biopsy.
Pain 2009 Sep
PMID:Functional and structural nerve fiber findings in heterozygote patients with Fabry disease. 1966 44

Fabry disease is an X-linked lysosomal disorder that results from a deficiency of the lysosomal enzyme alpha-galactosidase A leading to accumulation of glycolipids, mainly globotriaosylceramide in the cells from different tissues. Classical Fabry disease affects various organs. Clinical manifestations start at early age and include angiokeratoma, acroparesthesia, hypohydrosis, heat/exercise intolerance, gastrointestinal pain, diarrhea, and fever. The main complications of Fabry disease are more prominent after the age of 30 when kidney, heart, and/or cerebrovascular disorders appear. Most of the heterozygous females are symptomatic. Enzyme replacement therapy (ERT) is the only specific treatment for Fabry disease. The beneficial effect of ERT on different organs/systems has been extensively evaluated. Quality of life of patients receiving ERT is improved. Enzyme replacement stabilizes or slows the decline in renal function and reduces left ventricular hypertrophy. Fabry disease may be underdiagnosed because of nonspecific and multiorgan symptoms. Different screening strategies have been carried out in different at-risk populations in order to detect undiagnosed Fabry patients. An increasing knowledge about Fabry disease within the medical community increases the chances of patients to receive a timely diagnosis and, consequently, to access the appropriate therapy.
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PMID:Fabry disease: treatment and diagnosis. 1985 78

The Minnesota Muliphasic Personality Inventory (MMPI-2) is widely used in chronic illness and chronic pain populations to assess psychological functioning. We report the results of the first investigation using the MMPI-2 to assess psychological aspects of patients with Fabry disease. Fabry disease, an X-linked lysosomal storage disorder, is a multisystem progressive disease affecting the kidney, heart, and central nervous system, and is particularly associated with chronic symptoms including pain. In this study, 28 patients with Fabry disease completed the MMPI-2 and a background questionnaire. Fabry disease patients scored significantly higher than the MMPI-2 normative sample on seven clinical scales (Hs, D, Hy, Pd, Pa, Pt, Sc) and two validity scales (L, F). Individuals with elevated scores on the Hs, D, and Hy scales tend to have somatic complaints, sadness, and emotional distress. Under stress, they may experience an increase in physical symptoms. Elevated Pd, Pa, Pt, and Sc scales suggest social maladjustment, suspiciousness, and feelings of isolation. An elevated L scale suggests defensiveness; a high score on F suggests emotional turmoil. When compared with cohorts of patients with Gaucher disease (GD), chronic heart disease (CRHD), and chronic pain, the Fabry disease patients had significantly higher scores than GD patients and CRHD patients on numerous clinical (Hs, D, Si), and validity (F) scales underscoring the relative amount of suffering and pain experienced by Fabry disease patients. No significant differences on any MMPI-2 scales were found between the Fabry disease patients and the pain patients, suggesting that Fabry disease patients may be comparable to pain patient populations.
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PMID:Psychological aspects of patients with Fabry disease. 1992 64

Fabry disease (FD) is an X-linked lysosomal storage disorder caused by the deficiency of alpha-galactosidase A. In addition to the debilitating physical symptoms of FD, there are also under-recognized and poorly characterized psychiatric features. As a first step toward characterizing psychiatric features of FD, we administered the Achenbach adult self report questionnaire to 30 FD patients and the Achenbach adult behavior checklist questionnaire to 28 partners/parents/friends of FD patients. Data from at least one of the questionnaires were available on 33 subjects. Analysis focused on social-adaptive functioning in various aspects of daily life and on criteria related to the Diagnostic and statistical manual of mental disorders IV (DSM-IV). Adaptive functioning scale values, which primarily measure social and relationship functioning and occupational success, showed that eight FD patients (six female and two male) had mean adaptive functioning deficits as compared to population norms. Greater rates of depression (P < 0.01), anxiety (P = 0.05), depression and anxiety (P = 0.03), antisocial personality (P < 0.001), attention-deficit/hyperactivity (AD/H; P < 0.01), hyperactivity-impulsivity (P < 0.01), and aggressive behavior (P = 0.03) were associated with poorer adaptive functioning. Decreased social-adaptive functioning in this study was not statistically significantly associated to disease severity, pain, or level of vitality. This study shows for the first time that FD patients, particularly women, are affected by decreased social-adaptive functioning. Comprehensive treatment plans for FD should consider assessments and interventions to evaluate and improve social, occupational, and psychological functioning. Attention to the behavioral aspects of FD could lead to improved treatment outcome and improved quality of life. Individuals affected by Fabry disease exhibited social-adaptive functioning deficits that were significantly correlated with anxiety, depression, antisocial behavior, and AD/H problems in a sampling of our male and female patients aged between 18 years and 59 years.
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PMID:Social-adaptive and psychological functioning of patients affected by Fabry disease. 2008 63

Hemophilia A is an X-linked bleeding disorder, caused by deficient or defective blood coagulation factor VIII. The most characteristic symptoms of the severe forms of hemophilia A are joint and muscle bleeds. Intracranial hemorrhage occurs only in 3-10% of the patients. Spinal epidural hematomas are rarely seen. We describe a 13-month-old boy with hemophilia A who was admitted to the hospital because of irritability and unspecified pain for the past two days. There was no history of evident trauma, no fever. Physical investigation showed no skin lesions or hematomas and no obvious cause for the pain. Neurological examination showed a dysphoric toddler, mainly in the fetal position. No neurological abnormalities were found except for a miosis of the right pupil due to a suspected Horner syndrome. Magnetic resonance imaging of the spine showed an extensive epidural hematoma. The boy was successfully treated with intensive replacement therapy during three weeks and did not require surgical intervention. There was a rapid and complete clinical resolution. In conclusion, rare hematomas should be considered and searched for in children with bleeding disorders and not well understood complaints. Early diagnosis is important for the neurological outcome.
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PMID:Hemophilia a and spinal epidural hematoma in children. 2085 38

Fabry disease (FD) is an X-linked glycosphingolipid storage disorder caused by deficient activity of the lysosomal enzyme alpha-galactosidase A. This leads to a progressive accumulation of globotriaosylceramide (Gb3) in the lysosomes of different cells and tissues, causing principally ventricular hypertrophy, renal failure and cerebrovascular accidents, reducing lifespan both in hemizygous males and heterozygous females. Residual enzyme activity might lead to slow progression of the disease and result in the so-called cardiac or renal variants with delayed presentation. Two different forms of alpha-galactosidase A enzyme replacement therapies (ERT) are available for the treatment of FD, one genetically engineered in human cell line (agalsidase alfa, Replagal, Shire) and the other produced in a Chinese hamster ovary cell line (agalsidase beta, Fabrazyme, Genzyme). Although both proteins are structurally and functionally very similar, with the same amino acid sequence as the native human enzyme, they differ in the pattern of glycosilation of the protein depending on the originating cell line. Studies with both preparations have described a reduction in plasma, urinary sediment and tissue levels of Gb3, a decrease in the frequency of pain crisis and a reduction in left ventricular mass and improvement or stabilization of renal function. Studies have generally shown the greatest benefit when treatment is started at an early stage of the disease before extensive fibrosis or other irreversible tissue damage takes place. However, more data are needed to document long-term treatment outcomes. The aim of the present review is to provide an update overview of the two different forms of ERT for FD, their clinical effects in cardiac manifestations and their possible differences in terms of efficacy, side effects and safety profiles.
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PMID:Enzyme replacement therapy in Fabry disease: influence on cardiac manifestations. 2034 50


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