Have you ever wondered how the things we eat and drink give our bodies energy and build our bodies? It's a very amazing process, isn't it? But sometimes, small flaws in this process, that is, defects, can occur from birth. That's what we're going to talk about today. Don't worry, this may seem like a complicated topic, but I'll explain it in a simple way that you can understand.
What are these so-called Inborn Errors of Metabolism (IEM)?
Simply put, metabolism is the chemical process that converts the food we eat into energy and removes waste products. It's like a little factory inside our bodies. For this factory to work properly, it needs to have everything it needs.
Now, Inborn Errors of Metabolism (IEM) , sometimes called inherited metabolic diseases, are a group of conditions where the chemical process I mentioned is not carried out properly. It's like when a machine in a factory, or a person working on it, is not working properly. This happens because certain enzymes , which are special proteins that help these chemical processes, are not produced properly, or because they don't work properly.
What types of errors are there?
In fact, there are hundreds of types of inborn errors of metabolism. Often, these diseases are named after the enzyme that is not working properly. Let's look at some of the more common types:
- Lysosomal storage disorders: Imagine that our bodies have little factories that process waste. Sometimes, in diseases called ``Lysosomal storage disorders,'' those factories don't work properly. Then, toxic waste that should be removed accumulates in the body. It's like garbage accumulating in your house if the garbage truck doesn't come. For example, diseases like ``Hurler syndrome,'' ``Gaucher disease,'' and ``Tay-Sachs disease,'' fall into this category.
- Maple syrup urine disease: This is a condition in which amino acids, the basic building blocks of proteins, build up in the body. This can damage the nervous system and cause the urine to smell like maple syrup. This is how the disease got its name.
- Glycogen storage disease: This is when the body is unable to properly store the sugar (glucose) from the food we eat. This can lead to low blood sugar.
- Mitochondrial diseases: Mitochondria are the tiny structures in our body that help cells produce energy. In these diseases, these mitochondria do not function properly, preventing the cells from producing the energy they need. This can affect the function of many important organs, such as the brain, muscles, liver, and kidneys.
- Peroxisomal disorders: This is similar to lysosomal storage diseases. Here, harmful toxins accumulate in the body.
- Metal metabolism disorders: Our bodies contain small amounts of various metals. However, in these diseases, some metals accumulate in the body and become toxic. For example, in a condition called ``Wilson disease``, copper accumulates excessively, and in ``hemochromatosis``, iron accumulates excessively.
- Urea cycle disorder: This is when the body is unable to properly remove a toxic substance called ammonia, which builds up in the blood and causes problems.
Who is most affected by these conditions?
Anyone can develop these inborn errors of metabolism (IEMs). This is because they are caused by changes in our genes, or DNA. The genetic causes that affect each type of IEM are different. However, if someone in your family has this condition, you are at a slightly higher risk of developing something like this.
How common are these?
Worldwide, it's estimated that about one in every 2,500 babies born may have this type of congenital metabolic defect. This means that these are not that rare.
How does this metabolic disorder affect the body?
These IEM conditions mainly affect the ability to properly utilize the following nutrients that we get from the foods we eat and drink:
- Carbohydrates (starches and sugars)
- Sugar (glucose)
- Protein
- Fats
Therefore, the symptoms of these diseases can affect various organ systems in the body. They can also affect a child's growth, intellectual development, and ability to perform daily tasks .
What are the symptoms of this?
The symptoms of these congenital metabolic disorders can vary from person to person. The severity of the disease also varies from person to person. Some common symptoms include:
- Developmental delays : This means that intellectual and physical abilities do not develop in a way that is appropriate for age.
- Weight loss or weight gain.
- Not being tall enough (Growth challenges).
- Seizures : This means seizure-like conditions.
- Poor appetite .
- Lethargic, constantly tired .
- Unusual odors from urine, sweat, or breath .
- Abdominal pain, vomiting .
Remember, don't assume that you have a medical condition just because you have one or two of these symptoms. However, if these symptoms persist, especially in a young child, it's important to seek medical advice. Some of these conditions can be life-threatening if not treated properly.
What are the reasons for this?
The main cause of these congenital metabolic defects (IEMs) is a genetic mutation . This occurs during the embryonic stage, that is, when the baby is in the womb, when cells divide and form new ones.
Some of the genes in our bodies instruct proteins to carry out the chemical reactions necessary for the metabolic process after we eat. Special proteins called enzymes carry out these chemical reactions.
Now, in the body of someone with this IEM condition, those enzymes don't get the instructions they need to do their job properly. That's why these symptoms occur.
How do you recognize these?
Most of the time, doctors identify these congenital metabolic disorders either before the baby is born (prenatal screening) or during newborn screening . In Sri Lanka, all newborns are tested for some of these diseases. For some people, symptoms may appear even after they are adults, and that is when the disease is identified.
What tests are being done for this?
Because there are many types of IEM, various tests are required to accurately diagnose the disease. Some of them are:
- Metabolic testing: This involves taking a sample of blood or urine and looking at patterns in amino acids (the building blocks of proteins), fats, and glucose (sugar) levels. This can help predict the type of disease.
- Genetic testing: Here, a blood sample or a sample of saliva from inside the mouth is taken and tested for changes in genes.
- Amniocentesis: This is a test done during pregnancy. A small sample of the amniotic fluid surrounding the baby in the womb is taken and checked for genetic abnormalities.
- Glucose testing: This is done to check your blood sugar levels. This is done if you have symptoms such as frequent fatigue, feeling weak, or having fits.
- Eye exam: Some IEM conditions can affect vision, so an eye exam is recommended.
What are the treatments for this?
Treatment for congenital metabolic disorders varies depending on the type of disease. The main treatments include:
- Dietary changes: Since the body cannot properly utilize the nutrients in certain foods, eliminating those foods from the diet can help control symptoms. This can sometimes be a lifelong process.
- Medication: Your doctor may prescribe certain medications to help regulate your metabolism. These may be enzyme replacements or other chemical replacements.
- Dialysis: This is a procedure that removes toxins from the blood. It may be necessary in some emergencies.
- Organ transplant: In some severe cases of IEM, a liver transplant, for example, may be necessary.
Types of medications given
The types of medications given vary depending on the type of disease. Some examples are:
- Glucose solution `(Glucose solution)`
- Insulin `(Insulin)`
- Sodium benzoate or sodium phenylacetate
- Amino acid supplements
- Enzyme replacement
- Dietary supplements
What are the possible side effects if left untreated?
If these congenital metabolic defects are not managed properly, the body cannot properly utilize some food components, and toxic substances can accumulate in the blood, leading to serious conditions such as:
- Having a fit (Seizures)
- Organ failure (e.g. liver, kidneys)
- Brain damage
That is why it is so important to identify these diseases quickly and treat them properly.
How to live with the symptoms?
When living with these IEM conditions, you may sometimes feel tired and lethargic. When symptoms worsen, it can be difficult to perform daily tasks. The most important thing is to follow the treatment plan your doctor gives you. It is very important to only eat foods that are suitable for your body and that you can process properly.
Sometimes, it can be difficult to stick to your doctor's diet, especially if it's a very restrictive diet. In such cases, talk to your doctor or a nutritionist for help adjusting to this new eating pattern.
Can these be prevented?
In fact, these birth defects are not preventable because they are caused by genetic changes. However, if you are planning to start a family, you can talk to your doctor about genetic counseling and, if necessary , genetic testing . This will help you understand your risk of having a child with this genetic condition.
What will life be like with this situation?
There is no cure for these congenital metabolic disorders (IEMs). The severity of your symptoms will determine your future. Some IEM conditions can be very dangerous if toxins build up in the blood that the body cannot eliminate.
However, if the disease is recognized early, treated properly, and the necessary lifestyle changes are made, most people can live normal, happy lives.
When should you see a doctor?
If your symptoms worsen despite following your doctor's recommended treatment plan, be sure to see a doctor. If you are pregnant, ask your doctor about prenatal and newborn screenings that can help check for these birth defects in your baby.
Most importantly: If you or your child has a seizure, go to the nearest hospital emergency room immediately.
Questions to ask your doctor/doctor
If you find out that you or someone in your family has this type of hereditary metabolic disease, you can ask your doctor questions like:
- What kind of hereditary metabolic disease do I/my child have?
- What will life be like with this disease?
- What will my treatment plan include?
- What complications should I be especially concerned about?
- How does this affect my daily life?
- Are there support groups where you can meet other people with rare diseases like this?
Finally, a few things to remember
Okay, so let's remind you again of some of the things we talked about that you think are most important.
- Inborn errors of metabolism (IEM) are conditions caused by genetic factors that interfere with the process of converting the food we eat into energy and removing waste products.
- There are hundreds of types of diseases like this, each with different symptoms and treatments.
- Early diagnosis and proper treatment are key, as this can help many people live a better life.
- Dietary changes, medications, and sometimes other specific treatments can help manage these diseases.
- If you have any doubts or questions, don't be afraid to talk to your doctor.
I hope this information is helpful to you. Remember, you are not alone. There are doctors, nutritionists, and support groups to help those living with these conditions.
` Metabolic disorders, genetic diseases, enzymes, digestion, childhood diseases, genetic testing, metabolism
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