Fabry Disease

Also known as: Alpha-galactosidase A deficiency, Anderson-Fabry disease, Angiokeratoma corporis diffusum, Angiokeratoma diffuse, Ceramide trihexosidase deficiency, Fabry’s disease, GLA deficiency, Hereditary dystopic lipidosis, FD

What is it?

If there is an enzyme deficit in the lysosomes, it causes a class of hereditary metabolic diseases (lysosomal storage disorders) and Fabery Disease is one of those ailments. There is widespread distribution of lysosomes in all the body cells. Commonly speaking, they are called the digestive system cells. These cells are responsible for breaking the substances down for recycling or elimination from the body. The faulty GLA gene causes Fabry Disease. The requirement of the GLA gene is to give guidelines for the alpha-galactosidase A which simplifies globotriaosylceramide. A problematic GLA genes signify that an insufficient amount of the enzyme is produced which leads to inability to break down globotriaosylceramide. Consequently, the matter builds up in the lysosomes and causes cell problems notably in the kidneys, heart and nervous system. Then it triggers this disorder. If the enzyme is partially absent then the symptoms of this disorder are moderate while a complete deficit means something more extreme. But do not make the mistake of undermining the moderate form of the disorder for it still causes significant problems to important body organs such as the heart or the kidney.

How common is it?

Fabry Disease is supposed to affect one in every one thousand to nine thousand people. Although it impacts every ethnicity, the men are the ones who remain the most affected. The rare phenotype is less common than the late-onset type. One X chromosome from the mother and one Y chromosome from the father is inherited by men. The inheritance of the women works in getting one X chromosome from the father and one X chromosome from the mother. If a man has a problematic X chromosome, there are high chances of symptoms manifesting themselves. The men rely totally on the single X chromosome that they have for working of the gene. However, the women are less likely to show signs of the disorder. They have two X chromosomes which if one is faulty is compensated completely by the other efficient X chromosome. There are very rare cases in which a woman has been known to carry two X chromosomes both of which are flawed. Unlike other X-Linked conditions, Fabry Disease can cause significant health problems in females and they may be affected by the classic signs of this disorder. In some cases, they may be milder or present later in life, but this is not always the case.


Signs & Symptoms

Common signs and symptoms include: • Hypohidrosis or the incapacity to or minimal sweating • Acroparesthesias is the bursts of acute discomfort, particularly in the hands and feet • Gradual kidney deterioration which may cause renal failure • Cardiac and/or cerebrovascular disease • The front portion of your eyes becomes cloudy • Deformities of the nervous system • Deafness(tinnitus) or constant ringing sensation in the ears • Abdominal unease • Regular bowel movements • Dark red spots on the skin, commonly found in areas between the belly button and your knees (also known as angiokeratomas) • A low red blood cell count or haemoglobin (also known as anaemia) The triggers deteriorate with time in this disease, as it is a progressive disorder. The red flags can cause severe degradation to the brain, heart and kidneys. The results may be extremely fatal such as kidney breakdown, heart attack and stroke. Most individuals are not diagnosed until adulthood when the symptoms of this condition present. Later in life can in some affected individuals appear the milder form of the disease. It only involves problems with the heart, kidneys, or blood vessels in the brain.

Causes and Inheritance

The problematic GLA gene causes a major deficiency of the enzyme alpha-galactosidase A. Fabry Disease is inherited in an X-linked chromosomal manner. This means that one of the X linked sex chromosomes that you inherited has the disorder upon it. With males who only have one of the X sex-linked chromosomes, one altered copy of the GLA gene is enough for symptoms to present. Whereas with females who have two copies of the GLA gene on the two copies of the X sex-linked chromosomes, the person may have a non-functioning GLA gene on one of the chromosomes, but the other X chromosome may be able to provide instructions to make the enzyme and thereby the symptoms would not present or be less severe. Men who are afflicted with the Fabry disease pass down the X chromosomes to their girl children. In this manner, every daughter of a man having this disorder will bear the gene for this disorder. his is assuming paternity is not of concern or in question. However, symptoms may not present as the X chromosome inherited from the mother may be able to make up for the non-functioning or absent one. Every time a female has a child there is a 50% chance that they will pass the metabolic condition onto their daughter and a 50% chance that you will not. Fathers do not pass the gene onto their sons as they only inherit the Y chromosome from their father. After the diagnosis is confirmed, a genetic counsellor is recommended. You will be informed of how you acquired this disorder of Fabry disease. You will be guided about genetic testing for the entire family. The genetic counsellors may offer suitable guidelines and encouragement if you are considering having your own offspring.

Diagnosis

Your health specialist or doctor will evaluate you medically for a proper diagnosis. However, as the symptoms are very common to other illnesses, more tests may be needed. A blood spot examination may be carried out by your doctor in case you are diagnosed with Fabry disease. A minor prick on your finger is made for a blood sample in order to review the enzyme level present within the body. The GLA genetic test can also be done for detecting the Fabry disease. The medical expert would remove a portion from your cheek or any other body part to examine your DNA for any faulty GLA genes. This diagnosis is done for Fabry disease. Other recommended tests by the doctor include MRI or biopsies. Due to the rarity and similarity of this condition to other medical conditions, Fabry Disease can often be misdiagnosed in young children.

Treatment

Treatment which is specifically aimed at managing the individual symptoms continues to play a key role in the management of this condition. The health care professional would prescribe specific drugs tailored to manage symptoms and signs as they appear. These drugs are as follows: • Fabrazyme (agalsidase beta) • Galafold (migalastat) • Low doses of diphenylhydantoin, carbamazepine, or Neurontin Fabrazyme (agalsidase beta), is a solution containing the active enzyme. Fabrazyme works by reducing deposits of globotriaosylceramide within the cells of the kidneys and various other vital organs. Extensive research regarding this treatment has been promising, as it has been suggested that by as early as 20 weeks of treatment there can be almost a complete clearance of the substance. Your specialist will prescribe this drug to you and it will be administered via intravenous drip (usually every 2 weeks). Management and dosage will be thoroughly examined and explained by your health care provider. Galafold is primarily given to individuals above the age of 16 and is generally administered every other day. This drug works by attaching itself to many unstable forms of the enzyme and transporting them to the lysosome where it should be active in. It can be administered in capsule form once prescribed by your health care professional. If you experience headaches once you have been administered Galafold, do not panic, this is one of the most common side effects of this treatment. Diphenylhydantoin, carbamazepine, or Neurontin may help to reduce the pain suffered in the hands and feet (acroparesthesia), other symptoms such as kidney problems should be treated symptomatically. Dietary wise, your specialist dietitian may prescribe a low-fat diet to help resolve any gastrointestinal problems that you experience. This means avoiding foods high in fat such as cheese, dairy products, coconut oil and other high fat containing foods, it is recommended to always check the label of the foods you consume if you do suffer with gastrointestinal problems with this condition. Chronic kidney problems or kidney failure would require hemodialysis and/or kidney transplant. Other symptomatic management may require rehabilitation, hearing aids or psychological support. An early treatment with the enzyme replacement therapy with or without chaperone therapy is advised to prevent or delay kidney, cardiac or cerebrovascular manifestations.

Disclaimer: The information provided here is for educational purposes only and should not be taken as medical advice. Always consult with a qualified healthcare professional for diagnosis and treatment. Information sourced from reliable medical databases.


Beyond Fabry Disease: The Rare Disease Landscape

While Fabry Disease has its unique clinical manifestations and genetic triggers, most Lysosomal Storage Disorders (LSDs) share a common biological mechanism: the accumulation of cellular waste due to enzyme deficiency.

In the Indian context, the diagnostic odyssey for rare genetic conditions often spans several years, involving multiple medical specialists before a definitive diagnosis is reached. Taraasha Foundation is committed to simplifying this journey through education and specialized support.

We advocate for early clinical intervention and universal newborn screening to detect these conditions before the onset of irreversible symptoms. Understanding the inheritance patterns and the biological basis of metabolic shifts is a vital step for affected families.

Through Enzyme Replacement Therapy (ERT) and emerging gene therapies, the goal of modern medicine remains the same: ensuring a sustainable quality of life and empowering patients to lead fulfilling lives despite their diagnosis.

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