Have you ever heard of a baby being born with a "smooth brain"? You may have been a little scared when you heard these words. Today, let's talk simply about what this condition called `Lissencephaly` actually is, why it happens, and how it affects the baby. Although this is a bit of a complicated topic, I will explain it in a way that you can understand.
What is `Lissencephaly`?
Simply put, `Lissencephaly` means ``smooth brain.`` This is a very rare and serious brain malformation. It develops while the baby is still in the womb.
Think about it, our brain is like a walnut, isn't it? It has many folds (gyri) and grooves (sulci). These folds and grooves are very important. They separate the different parts of the brain, and they increase the surface area of the brain, which helps us develop our intelligence and thinking ability.
Now, in a baby with `Lissencephaly`, these `gyri` and `sulci` do not develop properly in the brain. Then the brain looks very smooth. Like a smooth board. That's why it is called a "smooth brain" .
Lissencephaly can come in many forms. There are more than 20 main types. But most often these are divided into two main categories:
- Classic lissencephaly (Type 1)
- Cobblestone lissencephaly (Type 2 )
Although the symptoms of both groups are somewhat similar, the genetic mutations that cause them may differ.
Sometimes `Lissencephaly` occurs alone, that is, without other symptoms. We call this `isolated lissencephaly`. Other times, it can occur together with other conditions (`syndromes`) such as `Miller-Dieker syndrome` or `Walker-Warburg syndrome`.
Children with lissencephaly often have significant developmental delays and mental disabilities . However, this varies from child to child, depending on the severity of the condition.
Who gets Lissencephaly? How common is it?
Lissencephaly affects developing fetuses . It usually begins to develop between 12 and 24 weeks of pregnancy. It is most often caused by genetic mutations. However, in rare cases, it can also be caused by non-genetic causes.
This is a very rare condition . According to researchers, only one in 100,000 babies are born with Lissencephaly. So don't be alarmed by this, but it's worth being aware.
What are the symptoms of a baby with lissencephaly?
The symptoms of lissencephaly vary greatly. It depends entirely on the severity of the condition and whether it is associated with other medical conditions. Some children may develop normally with only minor learning disabilities. While others may have very severe symptoms. The severity of these symptoms also varies greatly.
Therefore, it is very important to talk to your doctor about what to expect depending on the type of lissencephaly your child has.
Some of the symptoms of `Lissencephaly` are:
- Seizures: Nine out of ten children with lissencephaly develop epilepsy within the first year of life. This is the most common symptom.
- Difficulty swallowing (dysphagia) and eating: The baby may have difficulty sucking and swallowing food.
- Developmental delays: A baby may not develop as expected for their age. Things like smiling, holding their head up, rolling over, and sitting up may be delayed.
- Mental disabilities and learning differences: Intellectual development can be affected.
- Muscle spasms: Muscle spasms and twitching may occur.
- Issues with psychomotor functions: There may be difficulties with hand-eye coordination, walking, and grasping things.
- Failure to thrive: The baby's physical development may be very slow. They may not gain weight and may remain thin.
- A smaller than normal head (microcephaly): The head may be smaller than normal for age.
- Congenital limb differences: You may be born with certain differences in the hands, fingers, and toes.
Why does `Lissencephaly` occur? What are the causes?
Lissencephaly can be caused by both genetic and non-genetic factors. It most often develops in the womb, between 12 and 24 weeks of pregnancy.
Simply put, these causes are due to impaired neuronal migration of the outer part of the baby's brain (neuronal cells). Think about it, the part of our brain that is responsible for conscious movement and thought is called the cerebral cortex. It usually has deep folds (gyri) and grooves (sulci), right?
As a baby's brain develops in the womb, new cells form, which later become specialized nerve cells and move to the surface of the baby's brain. This is called `neuronal migration`. In this way, several layers of cells are formed. These layers form the `gyri` (folds).
But in the case of `Lissencephaly`, these cells don`t go where they need to go. Then the baby`s `cerebral cortex` doesn`t form enough layers of cells. Because of this, those `gyri` (folds) are either missing or underdeveloped.
Non-genetic causes
Although rare, non-genetic causes can also contribute to lissencephaly.
- Viral infections in the pregnant mother or the unborn baby: Some viral infections, especially in the first three months of pregnancy (the first to the twelfth week), can affect the fetus.
- Reduced oxygenated blood supply to the baby's brain (ischemia): This condition can occur if the amount of oxygen the brain receives decreases as the baby develops in the womb.
Genetic causes
Lissencephaly is most often caused by genetic mutations . A genetic mutation is a change in the sequence of our DNA. You know, our DNA sequence is what gives our cells the information they need to do their jobs. So if part of this DNA sequence is incomplete or damaged, symptoms of a genetic condition can occur.
A baby can inherit this genetic change from one or both parents. It depends on how the genetic change is inherited. But sometimes these genetic changes can occur `randomly`, without anyone in the family having had this condition before.
Scientists have identified several genes that can cause lissencephaly. Some of them are:
- `LIS1` (`PAFAH1B1`) gene: A change (`mutation`) or a loss of part (`deletion`) of this gene is associated with `isolated lissencephaly` as well as `Miller-Dieker syndrome`.
- `DCX` gene: This is a gene on the `X` chromosome. As you know, males have one `X` chromosome and one `Y` chromosome. Therefore, male babies are more likely to develop `Lissencephaly` due to this genetic mutation. Since female babies usually have two `X` chromosomes, even if they get this condition, the symptoms are often not as severe.
- `ARX` gene: Babies with a mutation in this gene have `Lissencephaly` along with other symptoms. For example, the absence of parts of the brain (`agenesis of the corpus callosum`), abnormalities of the genitals, and severe epilepsy. The `ARX` gene is also on the `X` chromosome. Therefore, male babies are most often affected.
- `RELN` gene: A mutation in this gene causes a condition called `Norman-Roberts syndrome`, which also includes `Lissencephaly`.
How is Lissencephaly diagnosed?
Sometimes, doctors may suspect lissencephaly during pregnancy if someone in the family has had the condition before, or if an ultrasound scan during pregnancy raises concerns. In that case, it can be diagnosed through special tests during pregnancy, such as amniocentesis, and a fetal magnetic resonance imaging (MRI) scan of the baby's brain.
Otherwise, doctors usually diagnose `Lissencephaly` after the baby is born, through a physical examination of the baby and `imaging tests` of the head.
With these imaging tests, doctors look to see if the `sulci` (grooves) and `gyri` (folds) on the surface of the baby's brain are absent or reduced, and if the `cerebral cortex` (cerebral cortex) is thickened.
What tests are used to diagnose `Lissencephaly`?
If your doctor suspects lissencephaly, either based on your family history or the results of an ultrasound scan during pregnancy, he or she may recommend several special tests during pregnancy. These include:
- Cell-free fetal DNA testing: This involves separating the mother's and the fetus's DNA from a sample of the mother's blood. This DNA is then tested in a laboratory to see if there is a higher chance of any chromosome problems.
- Amniocentesis: This is a test usually done during the second or third trimester of pregnancy. In this test, a doctor uses a thin needle to remove a small amount of amniotic fluid from the amniotic sac surrounding the baby. This sample of fluid is then tested in a laboratory. Amniocentesis can detect genetic conditions and mutations that cause conditions such as lissencephaly.
- Chorionic villus sampling (CVS): In this test, a doctor takes a sample of tissue called chorionic villi from your placenta. This sample can be taken either through the cervix (transcervical) or through the abdominal wall (transabdominal). Chorionic villi are tiny finger-like projections on the placenta. They contain the baby's own genetic material. This CVS test can find out if the baby has a chromosomal condition or other genetic condition.
Doctors use imaging tests like these to diagnose lissencephaly after a baby is born:
- Head ultrasound: An ultrasound is a non-invasive imaging test that uses high-frequency sound waves to create real-time pictures or videos of internal organs, such as the brain.
- Head computed tomography (CT scan): A CT scan is a test that uses X-rays and a computer to create many three-dimensional (3D) images of the part of the body being examined, in this case your child's head and brain.
- Magnetic resonance imaging (MRI) brain scan: An MRI scan is a painless test that produces very clear pictures of the structures and tissues in your child's brain. An MRI uses a large magnet, radio waves, and a computer to create these detailed pictures. It does not use X-rays.
Your doctor may also order an EEG (Electroencephalogram) test for your baby. An EEG measures and records the electrical signals in your baby's brain. During an EEG, a technician places small metal plates (electrodes) on your baby's scalp. These electrodes are connected to a machine that gives the doctor information about your baby's brain activity.
To confirm the diagnosis, doctors use DNA studies, such as chromosomal analysis and specific gene mutational analysis, to identify the genetic change responsible for lissencephaly.
How is Lissencephaly treated?
In fact, there is currently no cure or treatment for lissencephaly. Instead, doctors treat the specific symptoms of each child with lissencephaly.
These treatments may require the coordinated efforts of a team of different specialists, including:
- Pediatricians
- Neurologists
- Gastroenterologists (specialists in the digestive system)
- Nutritionists
- Respiratory therapists
- Occupational and physical therapists
People like that can be included.
Common treatments:
- Methods to make it easier for children with eating difficulties to get nutrients: for example, feeding through a tube into the stomach (`gastrostomy tube' - G-tube') and/or speech and swallowing therapy (`speech and swallowing therapy').
- Anti-seizure medications: Medications given to control seizures.
- Occupational and physical therapy to help with motor development and muscle strengthening: Things like exercises to help with body strength and movement.
- Placing a ventriculoperitoneal (VP) shunt to control hydrocephalus: A minor surgery to reduce the accumulation of extra fluid in the brain.
If your child has lissencephaly, your doctor will likely refer you for genetic counseling .
What is the prognosis for a child with lissencephaly?
The outlook for a child with lissencephaly varies greatly depending on the severity of the condition and whether it is associated with other medical conditions . Many children with lissencephaly may remain at their early developmental stages. This means that they may not be able to do many things on their own.
However, some children may develop normally with minor learning differences, so don't give up hope.
Early, ongoing therapies can be very helpful for some children. These therapies include:
- Physical therapy
- Occupational therapy
- Speech therapy
- Vision therapy
Things like this may be included.
Many children with lissencephaly have to take daily medications to prevent epilepsy and treat other complications.
What is the life expectancy of a child with lissencephaly?
The average life expectancy of a child with lissencephaly is relatively short. Most children die before the age of 10. The main causes of death among those with lissencephaly are aspiration and respiratory disease .
What should I expect if my child has `Lissencephaly`? / How do I take care of my baby?
The most important thing to remember is that no two children with lissencephaly are affected in the same way. No one can predict exactly how your child will be affected. The best thing you can do to prepare for the future is to talk to doctors who specialize in researching and treating lissencephaly.
To help care for your child with lissencephaly, follow the doctor's instructions exactly:
- Give all medications as prescribed.
- Perform developmental assessments and therapies accurately.
- Be sure to attend all follow-up medical visits.
Lissencephaly can cause cognitive, neurologic, and/or psychomotor problems. Many children with lissencephaly have developmental delays and may need assistance with daily activities throughout their lives.
Your child's medical team can answer your questions and offer you support. They may also be able to tell you about a support group that is available in your area or online.
Can Lissencephaly be prevented?
Unfortunately, most cases of lissencephaly cannot be prevented. If you are planning to have a child, talk to your doctor about genetic testing . This will help you understand the risk of your child having a genetic condition like lissencephaly, or a condition that can be caused by an inherited genetic mutation.
When should I see a doctor about `Lissencephaly`?
If your child has been diagnosed with lissencephaly, they should meet with their medical team regularly to see if their treatment is working properly and how their development is progressing.
Understanding your child's Lissencephaly diagnosis can be a difficult task. Your medical team will provide you with a solid treatment plan that is specific to your child's symptoms. The most important thing is to make sure your child receives the love and support they need throughout their life, and to be aware of any new symptoms that may arise.
What message do we want to take home from this story?
Lissencephaly is a rare and complex condition that occurs during the development of a baby's brain. In this condition, the normal folds and grooves (gyri and sulci) in the brain do not form properly, resulting in a "smooth" appearance.
- This can be caused by genetic factors, as well as, rarely, non-genetic factors .
- Symptoms can vary greatly from child to child. Epilepsy, developmental delays, and feeding difficulties are common.
- Although there is no complete cure for this, there are various treatments and therapies to control symptoms and improve the child's quality of life .
- The most important thing is to recognize it at the earliest stage, act according to the doctors' advice, and give the child the love and support they need .
- If you have any further questions about this, don't be afraid to talk to your doctor. It can also be a great help to join support groups with other parents of children like this and share experiences.
Remember, you are not alone. There are doctors, therapists, and many others who can help you on this journey.
` Lissencephaly, soft brain, brain malformations, fetal development, genetic mutations, developmental delay, epilepsy
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