What is Cornelia de Lange Syndrome? Let's talk about it!

Have you ever been a little worried or curious about your little one's development, or about some of the small changes in their appearance? There are some babies who develop a little differently than other babies, and their facial appearance and limbs may be slightly different. Today we are going to talk about a rare but very important condition to be aware of. This is called Cornelia de Lange Syndrome (CdLS).

What is Cornelia de Lan's syndrome (CdLS)?

Simply put, this is a rare genetic condition . "Genetic" means something that is caused by a change in our genes. This condition causes changes in a baby's physical appearance, intellectual development (such as learning ability), and behavior.

The important thing is that this condition (CdLS) does not affect all babies in the same way. While some babies may have very mild symptoms, others may have very severe symptoms. Strictly speaking, no two babies with this condition are exactly the same. However, there are some common similarities in their appearance and behavior. This condition can affect different parts of the baby's body. The main symptoms that are usually seen are:

• Growth retardation before and after birth. This means that the baby may lose weight and not grow taller.
• Changes in the head and face. Doctors call these ``craniofacial`` changes. We'll talk about this later.
• Some defects in the hands and fingers.
• Having more hair than normal on the body and head. This is called either ``hypertrichosis`` or ``hirsutism``.
• Intellectual disabilities.

How common is this condition?

Cornelia de Lann syndrome is actually a very rare condition . It is present at birth. Statistically, it occurs in about one in 10,000 live births, or one in 50,000 live births. However, doctors believe that some babies with this condition may go undiagnosed. This is because if the symptoms are very mild, they may be mistaken for other conditions. Or, they may not even realize that they are related to (CdLS).

What are the symptoms of Cornelia de Lann syndrome?

As we mentioned earlier, this condition does not affect every baby in the same way. Symptoms can vary from baby to baby. If your baby has this condition, you may notice one or more of the following symptoms.

Special features seen on the face and head

We call these `(Distinctive craniofacial features)`.

• The eyelashes often appear to be joined in the middle and curved upwards (this is called `(synophrys)`).
• The eyelashes are very long.
• The earlobes are positioned lower than normal.
• The teeth are small and there are large gaps between them.
• The nose becomes small and upturned.
• A head that is smaller than normal (doctors call this ``microcephaly'').
• Having a cleft palate (this doesn't happen to everyone, but some people can).

Neurodevelopmental features

• Developmental delays. That is, things like not crawling at a crawling age, not walking at a walking age.
• Many people can have moderate to severe intellectual disabilities , meaning they may have some impairment in things like learning and comprehension.

Psychiatric features

• They may exhibit behavior patterns similar to those of ``(Autism spectrum disorder)'' . For example, they may not want to communicate with others and may repeat the same things over and over again.
• Symptoms similar to those of a condition called Attention-deficit/hyperactivity disorder (ADHD) .
• Anxiety disorders.

Other common features that can be seen

In addition to this, Cornelia de Lann syndrome can cause other problems:

• Slow growth before and after birth. This can cause them to be short.
• Certain abnormalities in the hands, fingers, and bones of the hands.
• Having more hair than normal on the body (hirsutism).
• Hearing loss.
• Digestive system problems. For example, chronic acid reflux (GERD).
• Abnormalities of the genitals, such as undescended testicles in boys (cryptorchidism).
• Vision impairment. For example, nearsightedness (myopia).
• Seizures (we call them `seizures`).
• Heart disease. For example, having a hole in the heart.

What causes Cornelia de Lan syndrome?

This condition is usually caused by a harmful change (pathogenic variant) in one of seven genes . These genes are NIPBL, SMC1A, HDAC8, RAD21, SMC3, BRD4, and ANKRD11. Together, these genes help something called the cohesin complex function properly.

Now you might be wondering what this `(cohesin complex)` is. Simply put, this is a group of proteins that play a very important role when the baby is developing in the womb. This is what controls the genes that are needed to properly form the baby's limbs, face, and other parts of the body. So, if there is a change in any of the genes mentioned earlier, the functioning of this `(cohesin complex)` is impaired. Then, the baby's early development is hindered.

Between 60% and 80% of people with `(CdLS)` have this condition due to a change in the `NIPBL` gene. The condition is less likely to be caused by changes in the other six genes. For another 5% to 20% of people, the genetic cause of this condition has not yet been identified.

In most cases, children with this condition have no family history of the disease. This means that it is often caused by a new genetic change (called a `de novo mutation`). However, if one parent has mild symptoms of the condition, they have a 50% chance of having a child with the condition. Similarly, if healthy parents have a child with `(CdLS)`, the risk of having another child with the condition is estimated to be between 1% and 1.5%.

What complications can occur due to this condition?

Because Cornelia de Lann syndrome affects different parts of the body, various complications can occur.

Digestive system problems

• Duodenal atresia: A blockage in the first part of the baby's small intestine.
• Congenital diaphragmatic hernia: A hole in the baby's diaphragm (the muscle that separates the chest and stomach).
• `(Malrotation)`: An abnormality in the way the baby's intestines form.
• Pyloric stenosis: Narrowing of the opening from the baby's stomach to the small intestine.
• Inguinal hernia: A part of the baby's intestine pushes through an opening in the abdominal wall into the groin area.
• Barrett's esophagus: A condition that can occur due to severe GERD.

Genitourinary problems

• Cryptorchidism: A condition in which the testicles of a male baby fail to descend into the scrotum either before birth or shortly after birth.
• `(Hypospadias)`: In male babies, the urethra does not open in the correct place on the penis.
• `(Renal hypoplasia)`: One or both of the baby's kidneys are smaller than normal.

Eye problems

• `(Ptosis)`: Inability to open the eye properly due to the upper eyelid drooping downwards.
• Blepharitis: Inflammation and infection of the eyelid.
• Vision impairments: For example, conditions such as `(astigmatism)` (blurred vision due to curvature of the outer layer of the eye).

How is Cornelia de Lan's syndrome diagnosed?

Your baby's doctor may be able to diagnose this condition right after birth or shortly after . The doctor will examine your baby physically, assess symptoms, and ask about your family's medical history.

However, if your baby's symptoms are very mild, it can be difficult to diagnose the condition. In such cases, your doctor may recommend genetic testing to confirm the diagnosis.

Very rarely, this condition can be diagnosed before the baby is born. This is called prenatal genetic testing . It can identify the genetic mutations that cause this condition.

How is Cornelia de Lan's syndrome treated?

Treatment for this condition varies from baby to baby, depending on the symptoms each baby has. Because this condition affects multiple parts of the body, a team of doctors will work together to plan treatment. Treatment may include:

Nutrition and feeding

• Inserting a gastrostomy tube to provide high-calorie formula and/or food to prevent growth delays in the baby.
• Seek advice from a nutritionist to discuss eating difficulties.

Surgery

• Bone abnormalities.
• Digestive system problems.
• Heart disease.
• Cleft palate.
• Undescended testicles.

Surgery may be necessary to treat conditions like these.

Medicines

• Anticonvulsant drugs control or prevent seizures.
• Antidepressants to control self-harming or aggressive behavior.
• Antibiotics treat respiratory infections.

Some digestive and heart conditions can also be treated with medication.

Therapies

These treatments need to be continued throughout the baby's life. Various therapeutic methods can be used to address developmental delays, intellectual disabilities, and behavioral problems in the baby. These may include:

• Physical therapy.
• Occupational therapy.
• Speech therapy.
• Psychotherapy.

In addition, there is a need for ongoing assessment and monitoring of certain activities and developmental delays throughout the baby's life. This includes:

• Hearing and vision tests.
• Growth and psychomotor development (working as one thinks).
• Heart and kidney function.
• Functioning of the digestive system.

These should always be checked by doctors.

What is the life expectancy of someone with Cornelia de Lann syndrome?

The life expectancy of people with this condition is generally normal. Most children with this condition live well into adulthood. However, if the baby has some of the more severe symptoms of this disease (especially heart and throat problems), it can shorten their life expectancy.

Adults with CdLS may require ongoing medical care throughout their lives. If complications develop, the prognosis depends on the severity and treatment.

Can this situation be prevented?

Because it is a genetic condition, Cornelia de Lann syndrome cannot be prevented. If you are planning to become pregnant and want to know your risk of having a child with the condition, talk to your doctor about genetic counseling or genetic testing .

It's normal to feel shocked and sad when you find out that your baby has a rare genetic condition. But remember, most children with Cornelia de Lann syndrome live full lives and thrive well into adulthood.

Once your baby's condition is diagnosed, your doctor will talk to you about different treatment options. You may also need to work with a team of specialists. The most important thing is to learn as much as you can about your baby's condition and take the lead in providing the best care possible.

The most important things to remember (Take-Home Message)

Okay, so let's summarize some of the key points you need to remember from what we've talked about:

• Cornelia de Lan syndrome (CdLS) is a rare genetic condition.
• This can affect the baby's appearance, growth, intelligence, and behavior .
• Symptoms vary from baby to baby ; some are mild, some are severe.
• The reason is a change in genes.
• Treatment depends on the baby's symptoms. Various therapeutic methods, including surgery if necessary, and medication may be used.
• Although this condition cannot be prevented, genetic counseling can help you learn about your risk.
• Early identification, proper treatment, and loving care can help these children live meaningful lives.

If you have any further questions or concerns about this, be sure to talk to your family doctor or pediatrician. They will provide you with the guidance you need.

` Cornelia de Lange syndrome, CdLS, genetic diseases, child health, developmental delay, physical features, rare diseases