Introduction
Lysosomal storage disorders are a group of heterogeneous diseases caused by compromised enzyme function leading to multiple organ failure [1]. Fabry disease is a rare X-linked deficiency of α-galactosidase activity in lysosomes that results in the accumulation of globotriaosylceramide and related neutral glycosphingolipids [2]. This article presents a brief literature overview of the disease with a clinical case of classic Fabry disease in a resident of Transcarpathia (Ukraine).
The purpose of the study: we aimed to provide a narrative literature overview of Fabry disease with a clinical case presentation.
Materials and methods
We have provided a comprehensive clinical, neurological, laboratory, and instrumental analysis of Fabry disease in a young white adult admitted to the Regional Clinical Center of Neurosurgery and Neurology (Uzhhorod, Ukraine).
Results and discussion
Lysosomal storage diseases are a group of nearly 60 inherited disorders characterized by inappropriate lipid accumulation in lysosomes due to specific enzyme deficiencies. Gaucher disease was the first of these disorders to be described in 1882 [3], followed by Fabry disease in 1898 [4–6]. Pompe disease (also known as glycogen storage disease type II) was the first disease to be identified as a lysosomal storage disease in 1963 [7–9]. Most lysosomal storage diseases are characte-rized by progressive course, often resulting in severe manifestations and early death. Lysosomal storage diseases should be considered in the differential diagnosis of patients with neurologic, muscular, renal degeneration, unexplained hepatomegaly, splenomegaly, cardiomyopathy, or skeletal dysplasias and deformities [10–17].
Definition
Fabry disease, or Anderson-Fabry disease, is an inherited disorder belonging to the group of lysosomal storage diseases caused by a significant decrease in the activity or absence of α-galactosidase A enzyme due to mutations in the GLA gene [1, 18]. Deficiency of α-galactosidase A leads to the accumulation of globotriaosylceramide and related glycophospholipids in the lysosomes of cells of various organs, including the heart, kidneys, nervous system, and vascular endothelium [19, 20]. Fabry disease is inherited by a recessive X-linked type. Hemizygous men have a single mutant X chromosome that they pass on only to their daughters, not sons, which determines the classical phenotype of the disease.
Epidemiology
The prevalence of the disease in different countries varies widely (from 1 per 117,000 to 1 per 476,000 population) [21]. The International Fabry Disease Genotype-Phenotype Database is constantly updated and contains information on approximately 1,200 patients. According to the Okhmatdyt Clinic, in 2019, twenty patients (18 adults and 2 children) were diagnosed in Ukraine; according to the world statistics, the potential number of patients in Ukraine is 800.
History
English dermatologist William Anderson and German dermatologist Johannes Fabry first described the disease in 1898, independently of each other.
In 1898 in England, Fabry described a 13-year-old patient affected by nodular purpura and subsequent albuminuria and he classified this clinical case as angiokeratoma corporis diffusum. That same year in Germany Anderson described a clinical case of a patient aged 39 with angiokeratomas, proteinuria, finger deformity, varicose veins, and lymphedema and suggested this was a case of systemic disorder [22].
In childhood, the disease is manifested itself in pain in the hands and feet, angiokeratomas, hypohidrosis, asthenia; in older age, abdominal pain, lung, kidney, heart damage appear; there is a risk of transient ischemic attacks and stroke [21, 23]. The disease is progressive, accompanied by a decrease in the qua-lity of life and life expectancy. The death of patients usually occurs in the fourth decade of life due to cardiovascular, cerebrovascular complications, or renal failure [24].
Clinical case
A twenty-four-year-old man presented to his primary care physician complained of the following:
— constant intense burning pain in the hands and feet, which is exacerbated by exercise;
— hypothermia, and overheating;
— episodic tinnitus;
— hearing loss in the right ear;
— episodes of diarrhea;
— dry skin;
— rapid fatigue.
From the age of eight, the patient had attacks of burning intense pain in the feet, which were provoked by hypothermia, overheating, and physical activity. Gradually, over the next two years, the pain became constant, and significantly disrupted the normal functioning of the patient. At the age of 20, the first complaints of burning pain in the hands, provoked by exercise, appeared.
Based on clinical data, a genetic disease was suspected. The results of routine hematological tests were within normal limits. Electromyoneurography showed no pathological changes either. In the plan of diagnostic search, taking into account the patient’s complaints, a genetic study was carried out, a molecular diagnosis of the GLA gene was performed, which revealed a mutation of p.560T>A (r.M187K) in the hemizygous state. There were no signs of damage to vital organs and systems characteristic of Fabry disease: proteinuria and signs of chronic kidney disease, heart disease according to electrocardiography and echocardiography, as well as cerebrovascular manifestations.
The patient was diagnosed with a hereditary metabolic disorder from the group of lysosomal storage disorders: Fabry-Anderson disease, X-linked type of inheritance (E75.2). He was referred to the Center for Orphan Diseases for enzyme replacement therapy. The patient receives a lifetime course of fabrazyme at a dose of 1 mg/kg every 2 weeks.
Family history: parents refused genetic testing.
Conclusions
Our case presents a late diagnosis of Fabry disease at the age of 20 with the participation of specialist physicians (neurologist, geneticist). In Transcarpathia, selective screening is actively conducted among children and adults at high clinical risk. Early diagnosis of the disease and enzyme replacement therapy significantly improve the state of patients, delaying disease progression and the development of complications as when patients reach 30–40 years of age, they can develop kidney disease, heart disease, and stroke.
Received 18.05.2021
Revised 31.05.2021
Accepted 08.06.2021
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