Is this an increase in ammonia in your body? Let's learn about OTC Deficiency!

You've probably heard that if our bodies are deficient in certain things, big problems can arise. That's what this OTC deficiency is all about. Imagine what would happen if your liver was deficient in an enzyme that is needed to function properly? While this is a serious story, there are good treatments. Let's talk about this in more detail, shall we?

What exactly is this OTC deficiency?

Simply put, OTC deficiency means that your liver is unable to properly produce an enzyme called Ornithine Transcarbamylase (OTC). This OTC enzyme is very important because it helps remove a toxic substance called ammonia from our blood. So when this enzyme is low, ammonia starts to build up in the body. This is actually a urea cycle disorder .

Now let's see how this happens. When we eat protein, the bacteria in our intestines break down the protein and produce ammonia as a waste product. Then our liver takes this ammonia and converts it into urea in a process called the urea cycle. That's what the OTC enzyme is for. Then our kidneys filter this urea from the blood and excrete it as urine. Do you understand? So when OTC is gone, this whole process goes haywire.

What are the main types of this condition?

OTC deficiency is mainly divided into three types, depending on the time it takes for symptoms to appear:

• Neonatal type: This is the most severe type. Symptoms appear within the first 30 days of birth. These babies need immediate treatment.
• Intermediate type: This usually affects children from one month to about 16 years of age.
• Late-onset type: This can appear after the age of 16, sometimes as late as the age of 60. This is the least severe of the other two types.

Who is more likely to develop OTC deficiency?

OTC deficiency is actually a very rare disease . However, it is the most common of the urea cycle disorders. According to researchers, it can affect one in 14,000 or one in 80,000 people worldwide. What's more, this condition affects boys more often and more severely .

What are the symptoms of OTC deficiency?

The symptoms of this disease vary depending on the time of onset. In newborns, the symptoms are most severe. These symptoms are most common after eating a protein-rich food.

Symptoms in newborn babies

If a baby has this condition, you may see things like this:

• They refuse to eat or drink, and they don't drink milk.
• Frequent vomiting.
• Very anxious, always crying.
• Always feeling sleepy and lifeless (`Lethargy`).
• Seizures may occur.
• Lifeless body, like a piece of cloth (`Hypotonia`).
• The liver may become swollen and enlarged (`Hepatomegaly`).

Imagine how scared a mother would be if something like this happened to a newborn baby. That's why it's so important to be aware of these symptoms.

Symptoms in children from one month to 16 years of age

Children over one month old and under 16 years old may also experience the symptoms mentioned above. In addition, you may also see these:

• Confusion, a state of mental confusion.
• Delirium, such as hallucinations.
• Loss of balance and inability to walk properly (`Ataxia`).

Symptoms in adults

If this condition occurs in an adult, additional symptoms may occur, in addition to the symptoms in young children mentioned earlier:

• Nausea.
• Headaches like migraines.
• Difficulty speaking, slurred speech (Dysarthria).
• Hallucinations are seeing or hearing things that are not there.
• Blurred vision or other visual disturbances.

Why does this OTC deficiency occur? What are the causes?

OTC deficiency is a genetic disorder . This means that it is caused by changes in our DNA. Researchers have so far identified about 400 DNA changes that can cause this disease. However, in some cases (about 20 percent of cases), it can also be caused by a DNA change that cannot be detected by tests.

There are two main ways in which these DNA (`DNA`) changes can occur:

• Inherited: A baby can inherit this DNA mutation from their mother. If this happens, a boy will have the disease. If a girl is a carrier, she will be affected. This varies from country to country, but it is usually between 36% and 80% of cases.
• Noninherited (de novo) type: In this case, the baby does not inherit the DNA change. This means that the change occurred randomly while the baby was developing in the mother's womb.

Inherited OTC deficiency is an X-linked condition . This means that only females are carriers and do not develop the full disease. However, they can still develop symptoms. Research has shown that between 10% and 20% of female carriers will develop symptoms at some point in their lives.

What complications can occur due to OTC deficiency?

OTC deficiency can cause high levels of ammonia in the blood. This high level of ammonia in the blood (Hyperammonemia) is toxic to the brain . This can lead to metabolic encephalopathy.If this becomes severe or lasts for a long time, serious complications can occur, such as:

• Intellectual disability and developmental delays.
• Neurological disorders like cerebral palsy.
• To fall into a coma means to lose consciousness.
• Unfortunately, even death can occur.

These complications are most common, and are more severe, in newborns with OTC deficiency.

OTC deficiency can be very dangerous during pregnancy. However, it is possible to manage the condition during pregnancy and have a healthy baby. If you have OTC deficiency, or if someone in your family has a history of this condition, it is a good idea to talk to your obstetrician and gynecologist (`Ob/Gyn`). They can then work with the doctors who treat your OTC deficiency to coordinate the care you need.

How do doctors detect (diagnose) OTC deficiency?

OTC deficiency is mainly diagnosed through laboratory tests, especially blood tests and urine tests. In many cases, it can be detected before a baby is born through DNA tests. However, even though OTC deficiency is a genetic condition, these tests may not be able to detect all the DNA changes that can cause it. This is because there are a wide variety of DNA changes that can cause it.

Depending on the laws and regulations of the country you live in, there may be a system in place to test every newborn for OTC deficiency. In such places, the chances of detecting the disease early are higher.

However, in places where such standard testing methods are not available, it can be difficult for even experienced doctors to diagnose the condition after the baby is born. This is because the symptoms are very vague in the early stages and can resemble those of any other illness. In the most severe cases, ammonia poisoning can cause brain damage before doctors even detect the condition.

What are the treatments for OTC deficiency?

The good news is that there are good treatments for OTC deficiency. There are a few key points to keep in mind when treating this:

• Reducing ammonia levels in the blood: In an emergency, dialysis can quickly remove ammonia from the blood.
• Alternative pathways therapy: There are nitrogen-scavenging medications. These work by capturing nitrogen, processing it in other ways, and preventing the formation of ammonia. Examples include drugs like Sodium Phenylacetate and Sodium Benzoate.
• Dietary changes: Reducing and managing protein intake is important to keep blood ammonia levels at a safe level.To do this, you need to prioritize getting calories from carbohydrates (`carbs`) and fats (`fats`).
• Supplementation: Essential amino acids that cannot be obtained from protein must be taken as supplements.
• Monitoring blood ammonia levels: Regular blood tests can help detect ammonia levels in the blood before they become dangerously high.

If the OTC deficiency is detected before the baby is born, it may be possible to start treatment for the baby in the womb. Giving the mother these alternative medicines shortly before the baby is born can help keep the baby's ammonia levels at a safe level after birth.

Can OTC deficiency be completely cured?

Yes, there is a way to cure OTC deficiency. That is a liver transplant . In this, your diseased liver is removed and a healthy liver is transplanted. That liver can make the OTC enzyme. After the liver transplant, you can eat a normal, nutritious diet and will not need to take ammonia-lowering medications.

Unfortunately, liver transplants are not very common for this disease for a variety of reasons. Also, people who have had a liver transplant must take immunosuppressants for the rest of their lives to prevent rejection of the transplanted organ. Your doctor can tell you more about liver transplants and how they can affect you.

Gene therapy for OTC deficiency is also currently being investigated. This treatment may be a future alternative to liver transplantation for the disease.

What can you expect when living with OTC deficiency?

What you can expect with OTC deficiency varies depending on the severity of the condition. The more severe the condition, the less protein you can safely consume. Many people with OTC deficiency prefer a vegetarian diet even before they are diagnosed, because it is easier for them. Your doctor will guide you on how much protein you can consume and how to monitor it.

Overall, having an OTC deficiency can have a significant impact on your life. Increased levels of ammonia in the blood can increase the risk of complications such as intellectual disability. That's why it's so important to keep ammonia levels low.

However, with monitoring, treatment, and a low-protein diet, OTC deficiency is a largely manageable condition . It is important to monitor your blood ammonia levels regularly to ensure they do not become elevated. If your blood ammonia levels are elevated, treatment can help lower them.

How long does an OTC deficiency last?

OTC deficiency is a congenital condition , meaning you are born with it, and it lasts a lifetime. A liver transplant is the only cure available.

What is the future of someone with OTC deficiency?

The prognosis for someone with OTC deficiency depends largely on when symptoms first appear. 2020 research suggests that patients who present in middle-aged and older age have a better prognosis. Their mortality rate ranges from 8% to 13%.

Newborns are usually the most serious cases, and the mortality rate is also high. However, that mortality rate is much lower now than in previous years. A 30-year study conducted from 1971 to 2011 found that the mortality rate of newborns was 74%. However, a subsequent study conducted from 2001 to 2013 found that the mortality rate had decreased to 43%. This shows how much of a difference there has been with the advancement of medical science.

Is there a way to prevent OTC deficiency?

There is no way to prevent OTC deficiency. However, you can get genetic counseling before you have children. While this cannot prevent the disease, it can help you understand the chances of your children inheriting it.

At what time do you need to go to the hospital?

If you or your child have symptoms of high blood ammonia (`ammonia`), you should go to a hospital or emergency room immediately . The longer the blood ammonia (`ammonia`) remains high, the greater the risk of permanent brain damage. So it's not a good idea to delay.

What are the important questions to ask your doctor?

When you see your doctor, it's a good idea to ask some questions like these:

• Is my OTC deficiency caused by a currently identified genetic mutation?
• Should any other members of my family be tested for OTC deficiency?
• What is the maximum amount of protein I can take in a day?
• What treatment do I need?
• What supplements should I take?
• What are the symptoms that require emergency treatment?

Finally, a few things to keep in mind

Whether this disease affects you or your child, it's normal to experience a range of emotions when you learn that this is a lifelong genetic condition. You may feel fear, anxiety, and anger. All of these feelings are understandable.

But you need to remember, OTC deficiency is not your fault , and it is often caused by factors beyond your control.

Although OTC deficiency is a serious condition, advances in medical science have made it much more treatable than it was a few decades ago. With regular monitoring and treatment, the condition can be largely managed. There is also growing evidence that a liver transplant can cure the disease. If you have any questions or need help along the way, don't forget to rely on your medical team. They are always there to guide and support you.

` OTC deficiency, ammonia, liver, urea cycle, genetic diseases, protein, pediatric diseases