Have you ever heard of something called 'Refsum Disease'? Perhaps this name is a little new to many people. Because it is a very rare, that is, a genetic disease that is rarely seen. But it is very valuable to be a little aware of things like this. Today, we will talk about Refsum Disease simply, in a way that you can understand.
What exactly is Refsum Disease?
Simply put, Refsum disease is a genetic disorder that affects two different organs. One is Infantile Refsum Disease , and the other is Adult Refsum Disease . Both belong to a large group of diseases called ``Peroxisomal disorders.'' What happens in this is that due to certain changes (we call these ``mutations'') in the genes in our body, some types of fats cannot be broken down properly, that is, they cannot be digested. If you have this condition, your body loses the enzymes that help break down a type of fat called ``Phytanic acid.'' What happens is that ``Phytanic acid'' starts to accumulate in the body. Think of it like a little bit of garbage in our house and causes problems.
What is the difference between adult Refsum and infant Refsum?
In both types of Refsum disease, you can see the loss of vision and the accumulation of `(Phytanic acid)` in the body that I mentioned earlier. But these two conditions occur because of changes (`(mutations)`) in two different genes before we are even born.
- Infantile Refsum Disease: This is one of a group of conditions called Zellweger spectrum disorders. It causes symptoms in infants and young children. For example, floppy muscle tone , poor feeding , seizures , developmental delays , and liver disease . Infantile Refsum is a more serious condition than adult Refsum. The survival time for babies with this condition can vary, but it can ultimately be fatal.
- Adult Refsum Disease: This usually appears in late childhood or later. It mainly causes vision loss , loss of smell , numbness or weakness in the limbs , and hearing loss . Unlike infantile Refsum, this does not affect the brain. Therefore, seizures or developmental delays are not usually seen. However, there is a risk of serious heart problems later in life.
How common is Refsum disease?
Refsum disease is actually a very rare condition. Infantile Refsum disease occurs in about one in a hundred thousand people. Adult Refsum disease is even rarer, occurring in about one in a million. So you can imagine how rare this is.
What are the symptoms of Refsum disease?
The symptoms of Refsum disease vary depending on the age at which you start experiencing symptoms.
Infantile Refsum
If your baby has Refsum's disease, they may be very floppy at birth, as if they are lifeless. They may also have difficulty breastfeeding . Their symptoms depend on the severity of the disease. They may have seizures, or they may have abnormalities in these organs:
- Kidneys (`(Kidneys)`)
- Liver (`(Liver)`)
- Bones (especially long bones)
Babies with severe cases of the disease can sometimes die within the first year of life.
Older children may experience things like:
- Developmental disabilities
- Poor growth
- Vision and hearing problems
Adult Refsum
The first symptom of adult Refsum disease is usually a loss of night vision . This is caused by a condition called `(Retinitis pigmentosa)`. Your child may notice this loss of night vision during their teenage years, around the age of thirteen or fourteen. Or they may not show any symptoms until they are adults. As they get older, this `(Retinitis pigmentosa)` condition can cause a loss of peripheral vision and eventually lead to complete blindness .
Other adult Refsum symptoms include:
- Loss of sense of smell (`(Anosmia)`)
- Numbness or burning sensation in the limbs
- Hearing loss
- Balance issues
- Ichthyosis (rough, scaly patches on the skin)
- Blurred vision, as if cataracts were forming in the eyes (`(Cataracts)`)
- Severe heart disease, for example, irregular heartbeat (arrhythmia) or heart failure (heart failure)
What are the complications of Refsum disease?
Refsum in infants is a very serious and debilitating condition. Children have severe problems with eating, seizures, vision and hearing. Their lifespan is shortened due to respiratory complications.
In adult Refsum, your vision gradually worsens over time. Weakness, loss of sensation, and balance problems also gradually increase. Sometimes, during physical stress, such as when you have a major illness or undergo surgery , the levels of `(Phytanic acid)` that I mentioned can become very high. Then the heartbeat can become irregular or there can be extreme weakness. If left untreated, these heart rhythm irregularities (`(Arrhythmias)`) can even be life-threatening.
What causes Refsum disease?
Refsum disease is caused by a change (mutation) in a gene that you have at birth. You can get this mutation from your mother, your father, or both.
There are more than twelve genes that can cause infantile Refsum. Of these, the most common are `(PEX1)` (about 60%), `(PEX6)` (about 15%), `(PEX12)` (about 7.6%) and `(PEX26)` (about 4.2%).
Adult Refsum disease is also caused by a genetic mutation that is present at birth and passed down through generations. About nine out of ten people with adult Refsum disease have a mutation in the gene `(PHYH)`. Most others have a mutation in the gene `(PEX7)`.
Think of it like a small factory in our body where some important machine breaks down. Problems like these occur when those machines called genes don't work properly.
How is Refsum disease diagnosed?
Doctors use different tests to diagnose Refsum disease, depending on your age. They may also do genetic tests to look for genetic mutations that cause Refsum disease.
- For infant Refsum: The most common tests are to measure very long-chain fatty acids (`(very long-chain fatty acids)`), phytanic acid (`(phytanic acid)`), and pristanic acid (`(pristanic acid)`).
- For adult Refsum: Your doctor may first take a blood sample and test your `(Phytanic acid)` levels.
How is Refsum disease treated?
Treatment for Infantile Refsum
If your child has infantile Refsum disease, the doctor will decide on treatment based on the child's symptoms. This may include things like:
- Tube feeding
- Cataract removal (`(Cataract removal)`)
- Glasses
- Hearing aids (`(Hearing aids)`)
- Vitamins
- Anti-seizure medications
- Various therapies and early intervention services for developmental delays (`(therapies/early intervention services)`)
Treatment for Adult Refsum
When treating adult Refsum disease, you may need to limit foods that increase your body's levels of phytanic acid. For example:
- Beef and lamb
- Dairy products
- Oily fish, such as cod, tuna, or haddock.
Some people may also need a treatment called ``Plasmapheresis'' to control the accumulation of ``Phytanic acid''. In ``Plasmapheresis'', a doctor takes some of your blood, filters out the excess ``Phytanic acid'', and then gives that blood back to you. Although this is a somewhat complicated treatment, it is very beneficial for some people.
Does Refsum disease require treatment for heart disease?
In adults with Refsum disease, if you suddenly develop an irregular heartbeat, you may need treatment to control your heart rate. This may include:
- Medications: Medications such as `(Beta-blockers)`, `(Calcium channel blockers)` or `(Anticoagulants)` that reduce blood clotting are given to control heart rate or reduce the risk of stroke.
- Cardioversion: The administration of a controlled electrical shock to restore a normal heartbeat pattern.
- Implantable cardioverter defibrillator (ICD): This is a device that is implanted under your skin. It monitors and regulates your heartbeat.
- Catheter ablation: This is a minimally invasive procedure that involves deliberately damaging diseased heart tissue to interrupt an irregular heartbeat.
What can someone with Refsum disease expect?
Children with infantile Refsum usually have severe developmental delays and require extensive medical intervention. Sadly, despite the best care, the severity and nature of the condition shortens the lifespan of these children.
Many people with adult Refsum successfully manage their symptoms by limiting foods high in `(Phytanic acid)`. With treatment, symptoms such as dry skin and numbness often go away. However, you may have to live with long-term vision or hearing problems. Some people may never regain their lost sense of smell.
How to reduce the risk of Refsum disease?
Because Refsum disease is a genetic disorder, there is no way to prevent it.
If you have Refsum disease, or think you may be a carrier of the disease, you may want to consider genetic testing. Genetic testing can identify the gene mutation that causes Refsum disease. A genetic counselor can help you understand the test results and explain the chances that your children will inherit the genetic condition.
What should I ask my doctor?
If you have Refsum disease, or suspect you have it, you can ask your doctor questions like these:
- What are the first symptoms of Refsum disease?
- What tests are used to diagnose Refsum disease?
- What are the treatment options for Refsum disease?
- Should I get a genetic test for Refsum disease?
- What are the chances that my child will inherit Refsum disease?
It's normal to feel scared when you learn that you or your child has a rare genetic disease. However, getting a diagnosis is the first step to understanding what's going on.
In summary (Take-Home Message)
Refsum Disease is a rare and complex condition. However, with proper diagnosis and prompt treatment , especially in adults with Refsum disease, symptoms can be controlled and a good life can be achieved. Although Refsum disease in infants is more challenging, it is important to provide the child with the best care and support possible.
If you have any further questions about this, or if you suspect that someone in your family has these symptoms, never hesitate to seek medical advice. It can also be a great help to join support groups that help people with these rare diseases and their families. Although everyone's experience is different, talking to others can help you feel less alone.
` Refsum disease, Refsum disease, genetic diseases, phytic acid, vision problems, hearing impairment, infant Refsum, adult Refsum
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