Are you aware of Alexander Disease? Let's talk about this rare condition!

Have you ever heard of Alexander Disease? You probably haven't even heard of it. The reason is that it is a very, very rare neurological condition in the world. But, it's worth it to have some knowledge about diseases like this, right? Especially since we are always concerned about the health and development of our children, it is important to be aware of things like this.

What is Alexander Disease? Let's understand it simply!

Okay, let's see what Alexander Disease is. Simply put, it's a disease that affects our nervous system, the system that carries messages throughout the body . Specifically, it affects the "white matter" in our brain. This white matter is the part of the brain that is made up of many nerve fibers.

This disease belongs to a group of diseases called leukodystrophy . Although this word may sound a bit complicated, it refers to diseases that damage the white matter of the brain.

In Alexander disease, the main damage is to a part called myelin . Myelin is a protective covering around our nerve fibers. Think of it like the plastic sheath around an electrical wire. This myelin sheath is what allows nerve messages to travel smoothly and quickly. So, when this myelin is damaged, the process of nerve message transmission is disrupted.

As a result, a person with Alexander syndrome may experience various problems, such as developmental delays and seizures . Unfortunately, this disease is a progressive, sometimes life-threatening condition. There is currently no cure for it.

How common is this disease?

Alexander disease is an extremely rare disease. It is estimated that this disease occurs in approximately one in a million births . The disease was first identified in 1949 by Dr. W. Stewart Alexander , an Australian physician. That is why it is called Alexander disease.

Are there types of Alexander disease?

Yes, doctors classify this disease according to the age at which symptoms begin to appear. There are several main types:

• Neonatal type: This is very rare. Symptoms appear within the first month of life.
• Infantile type: This type accounts for about 80% of Alexander syndrome diagnoses. Symptoms usually begin before the age of 2 years .
• Juvenile type: Symptoms can appear between the ages of 2 and 13. However, they are most common between the ages of 4 and 10. About 14% of all diagnoses fall into this type.
• Adult type: This is also not very common. Symptoms are usually mild. The condition can occur at any age after adolescence . About 6% of diagnoses fall into this type.

What is the cause of Alexander disease?

In 95% of cases of Alexander disease, a mutation occurs in a gene . This gene helps to make a protein called Glial Fibrillary Acidic Protein (GFAP) . Unfortunately, the cause of the remaining 5% of cases is still unknown.

Normally, these GFAP proteins join together to form long chains (filaments). These chains provide strength and support to the cells of our nervous system.

However, in people with Alexander disease, this GFAP protein is not produced properly. Instead, abnormal protein clumps called Rosenthal fibers accumulate in places inside cells where they shouldn't be. These Rosenthal fibers are what damage the myelin mentioned earlier.

Who is at higher risk of developing this disease?

In fact, anyone can develop this disease. Most of the time, the gene change occurs randomly, for no apparent reason. It is very rare for a child to inherit this genetic change from their parents. This means that most people have no family history of this disease.

What are the symptoms of Alexander disease?

The symptoms of this disease can vary from person to person. Also, the symptoms vary depending on the age (type) at which the disease begins.

Neonatal symptoms:

These symptoms become apparent within the first month of life.

• Hydrocephalus: This is a buildup of fluid in a child's brain. This can cause the head to become enlarged.
• Megalencephaly: Abnormal enlargement of the brain and head.
• Seizures/Epilepsy: Frequent seizure-like conditions.
• Spasticity: Muscle stiffness, decreased flexibility.
• Developmental delays: A child's failure to develop at an age-appropriate rate. For example, neck strength, rolling over, and sitting up may be delayed.
• Failure to thrive or gain weight properly.

Infantile symptoms:

These symptoms usually begin within the first six months, but can sometimes start as late as 24 months, or about two years. The symptoms are largely similar to those seen in the newborn period.

Juvenile-onset symptoms:

These symptoms usually appear between the ages of 4 and 10.

• Difficulty swallowing and speaking.
• Ataxia: This refers to problems with balance, coordination, and movement, such as being unable to walk or having difficulty grasping objects.
• Muscle problems: things like muscle stiffness (spasticity), muscle pain, muscle spasms.
• Frequent vomiting.

Adult-onset symptoms:

These symptoms can appear at any time during adulthood. They are often similar to those seen in childhood, but tremors may also occur. Sometimes these symptoms can mimic those of other conditions, such as Parkinson's disease or multiple sclerosis , so it is important to get an accurate diagnosis.

How is Alexander disease diagnosed?

Your doctor will first carefully examine you or your child's symptoms. In addition, they may also do tests such as:

• MRI scan (MRI - Magnetic Resonance Imaging): This can look for any changes in the brain. In particular, MRI can show changes in the white matter, such as signs of Rosenthal fibers.
• Genetic test: This is a blood test that can confirm whether there is a mutation in the GFAP gene that causes Alexander syndrome.

How is this disease treated? How is it managed?

Unfortunately, there is still no cure for Alexander's disease. Current treatments mainly aim to control symptoms and slow the progression of the disease .

However, scientists are continuing to conduct clinical trials to find new treatments for this disease. You can talk to your doctor about whether this type of trial is right for you or your child.

Depending on the symptoms, the following treatments may be used:

• Anti-seizure medications.
• Physical therapy, occupational therapy, and speech therapy. These help improve a child's movement, ability to perform daily tasks, and speech.
• For hydrocephalus, a condition where fluid builds up in the brain, shunt surgery can be performed. This removes the excess fluid from the brain.

What are the complications of Alexander disease?

The symptoms of Alexander syndrome may gradually worsen over time. Therefore, the patient may need things like:

• Devices that help with walking, such as wheelchairs or walkers.
• To obtain adequate nutrition, tube feeding ( enteral nutrition ) may be necessary.

What is the future (prognosis) for people with this disease?

Predicting the future of people with Alexander syndrome is a bit complicated, as it varies from person to person . As the disease progresses, symptoms can get worse over time, especially in children. The nature and duration of symptoms vary depending on the type of disease:

• Babies with the neonatal form are usually severely disabled, and many die before the age of two .
• Children with the infantile type may live for about five to ten years .
• Children with the juvenile-onset type can sometimes live into their 30s or 40s .
• Some people with the adult-onset form have very mild symptoms, or may even be asymptomatic. In most cases, the disease does not affect their lifespan.

It's normal to feel sad when you hear these things. But knowing this information will help you understand the disease.

Can Alexander disease be prevented?

In most cases, even experts can't say exactly why the gene change that causes Alexander syndrome occurs. Therefore, in most cases, there is no way to prevent this disease.

However, if someone in your family has Alexander disease or another type of leukodystrophy, it is a good idea to talk to a genetic counselor . This will help you understand the risk of your future children inheriting the disease. You may also want to consider a procedure called Preimplantation Genetic Diagnosis (PGD) . This involves selecting healthy embryos that do not have the GFAP gene mutation that causes Alexander disease and implanting them in the uterus through in vitro fertilization (IVF) .

What time should I see a doctor?

If you or your child has Alexander disease, see a doctor immediately if you experience any of these symptoms:

• Difficulty with balance or walking.
• Difficulty breathing, swallowing, eating, or speaking.
• Nausea and vomiting.
• Seizures.

What questions should I ask my doctor?

You can ask the doctor questions like these:

• What type of Alexander disease do I (or my child) have?
• What is the best treatment?
• Is it a good idea to get genetic testing for Alexander syndrome for other family members?
• What signs of complications should I look out for?

Finally, take-home message

Alexander Disease is a lifelong, progressive condition. It is very rare and can sometimes run in families. Genetic tests can identify the genetic variation that causes the disease.

Although there is no cure, there are treatments that can help relieve symptoms and improve quality of life. Scientists are continuing to research to find better treatments for this rare disease.

I hope that being aware of this information will help you understand the disease and seek medical advice quickly if necessary. Always remember, you are not alone, and you can get the help you need.

` Alexander Disease, Neurological Disease, Genetic Disease, Myelin, Leukodystrophy, Pediatric Disease