Have you ever felt like you were walking out of control, your limbs were numb, or your words were slurred when you spoke? While these things may seem like normal things, they can sometimes be signs of a medical condition. Today we are going to talk about a condition that is a bit complicated, but very important to know about. That is Machado-Joseph Disease (MJD) .
What is Machado-Joseph disease (MJD)?
Simply put, Machado-Joseph disease (MJD) is an inherited condition that affects our nervous system . It falls into a category called ataxia . "Ataxia" may be a new word to you. It means that our body's ability to control muscles gradually decreases. Think of it like losing coordination. This can cause us to lose balance and lose control of our limbs.
In MJD, in particular, there is a gradual loss of coordination in our arms and legs. This causes patients to walk in a distinctive, staggered manner. Some people may also have difficulty swallowing and speaking.
This MJD disease has another name, which is Spinocerebellar Ataxia type 3. In fact, this MJD is the most common type of this group of diseases called spinocerebellar ataxia.
Are there different types of Machado-Joseph disease (MJD)?
Yes, Machado-Joseph disease can be divided into three main types. These classifications are based on the age of onset and the severity of symptoms.
- Type I (MJD-I): This type usually begins between the ages of 10 and 30. Symptoms can be very severe and progress rapidly .
- Type II (MJD-II): This usually begins between the ages of 20 and 50. Symptoms gradually worsen over time.
- Type III (MJD-III): This type begins between the ages of 40 and 70. Symptoms gradually worsen over time .
Now you probably understand that the onset of symptoms and their nature are different for each of these three types.
What are the symptoms of Machado-Joseph disease (MJD)?
The symptoms you experience depend on which type of MJD you have.
Type I (MJD-I) symptoms
Symptoms of this type are severe and develop rapidly. They may include:
- Uncontrolled muscle contractions in the arms and legs (dystonia) .
- Muscle stiffness (rigidity) .
- Having too much muscle tone (hypertonia) .
- Abnormal, uncontrolled body movements (ataxia) .
- Staggering, lurching gait.
- Slurred speech, slurred speech.
- Difficulty swallowing food (dysphagia) .
- Protruding eyes (proptosis) .
Type II (MJD-II) symptoms
Symptoms of this type gradually worsen over time. They may include:
- Uncontrolled, continuous muscle contractions (spasticity) .
- Difficulty walking due to muscle contraction (spastic gait).
- Weakening of reflexes.
- Difficulty coordinating movements of the arms and legs (ataxia) .
Type III (MJD-III) symptoms
Symptoms of this type also tend to get worse over time. They may include:
- Muscle twitching.
- Numbness, tingling, pain, and numbness in the hands, feet, legs, and feet (neuropathy) .
- Muscle wasting (loss of muscle tissue - atrophy ).
- Unsteady gait.
Other common symptoms
In addition to these types, MJD patients may experience several other symptoms:
- Double vision (diplopia) .
- Inability to control eye movements (nystagmus) .
- Hand trembling.
- Problems with balance and coordination.
- Tongue or facial twitching.
- Sleep disorders.
- Chronic low back pain.
Important: When these symptoms occur together, you may wonder if they are signs of another neurological condition, such as multiple sclerosis or Parkinson's disease . Therefore, if you develop new symptoms or if an existing symptom gets worse, especially if they affect your movement and use of your body, see a doctor immediately.
What causes Machado-Joseph disease (MJD)?
The main cause of this disease is a mutation in our genes . It's like a small mistake in a computer code that can mess up the entire program.
Specifically, this mutation occurs in a gene called ATXN3 on our chromosome 14. In a section of DNA in this gene, something called "CAG" trinucleotide repeats is repeated several times in an unusual manner. CAG stands for the three chemical compounds Cytosine-Adenine-Guanine.
In the DNA of someone without MJD, this CAG repeat is repeated between 12 and 43 times. However, in the DNA of someone with MJD, this CAG repeat is repeated between 56 and 86 times. The age at which you start to develop symptoms and the severity of the disease are directly related to the number of CAG repeats.
The condition is inherited in an autosomal dominant manner . This means that a child needs only one parent to have the gene for the disease to develop. If you have MJD, your child has a 50% chance of inheriting the disease.
Who is at higher risk of developing Machado-Joseph disease (MJD)?
MJD is most common in people of Azorean or Portuguese descent . On the island of Flores in the Azores, it is reported that one in every 140 people has the disease. However, this does not mean that other ethnic groups are not affected. It can affect people of any ethnic group.
How is Machado-Joseph disease (MJD) diagnosed?
When you see a doctor, he or she will ask about your symptoms and do a physical examination. Since this condition runs in families, it is important to talk about your biological family history. If anyone else in your family has these symptoms, it is also important to ask about when their symptoms started and how quickly they progressed.
To confirm the diagnosis, your doctor may recommend genetic testing for Machado-Joseph disease . This genetic test can look for the number of suspicious CAG triplet repeats on your chromosome 14.
How is Machado-Joseph disease (MJD) treated?
Unfortunately, there is no cure for Machado-Joseph disease. Treatment for MJD is aimed at managing the symptoms you have. Medications may include:
- Medications such as Baclofen (Lioresal®) or Botulinum toxin (Botox®) help reduce the aforementioned dystonia and muscle spasms.
- Levodopa therapy helps reduce slowness and stiffness in body movements.
In addition, physical therapy and assistive equipment can help patients perform daily activities and move around. For vision problems, prism glasses can help reduce double vision or blurred vision.
Ask your doctor about clinical trials being conducted for this disease.
What is the life expectancy of someone with Machado-Joseph disease (MJD)?
The life expectancy of someone with MJD depends on which type of the disease they have. People with type I may have a shorter lifespan, perhaps in their mid-30s. However, people with type II or type III usually live a normal life span.
Can Machado-Joseph disease (MJD) be prevented?
Because MJD is a genetic disease, it is not preventable. If you are concerned that your children may inherit the disease, it is important to talk to a genetic counselor before planning a pregnancy. There may be ways to prevent MJD from being passed on to your children through genetic testing with In Vitro Fertilization (IVF) .
When should I see a doctor?
If you have any symptoms of Machado-Joseph disease, see a doctor. If someone in your family has the disease, it's a good idea to talk to your doctor about your risk of developing the disease.
What questions should I ask my doctor?
If you are diagnosed with MJD, you may want to ask your doctor questions like:
- What type of disease do I have?
- Will my symptoms get worse over time?
- What kind of treatment do you recommend?
- Will my children inherit MJD from me?
It's normal to have a lot of questions and feelings when you receive a diagnosis like Machado-Joseph disease (MJD). Ask for support from those closest to you. Also, be an active participant in your treatment - keep your appointments, follow your doctor's instructions, and ask questions. You can also talk to a mental health counselor to learn how to cope with this condition. Don't suppress your feelings. Talk to friends, a counselor, or a support group. Remember, you are not alone.
Take-Home Message
Machado-Joseph disease (MJD) is an inherited disease that affects our nervous system. It can affect things like balance and muscle control. Symptoms vary depending on the type of disease.
Although there is no cure for this yet, there are treatments that can help manage the symptoms. Things like physical therapy and assistive devices can make life easier. If you have these symptoms, or if someone in your family has this condition, it is best to seek medical advice as soon as possible. Remember, with the right information and support, you can cope with this condition.
` Machado-Joseph disease, MJD, spinocerebellar ataxia, ataxia, neurological diseases, genetic diseases, hereditary diseases
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