What is ectodermal dysplasia?

Ectodermal dysplasias (EDs) are a group of rare conditions that affect children from birth. Early in the development, they affect the body parts that come from the "outer layer" of the fetus.¹ These consist of the sweat glands, skin, hair, nails, and teeth.¹ There are more than 200 forms of ED that doctors rarely recognise. Some children exhibit more noticeable alterations that significantly impact their daily lives, while others have subtler traits.

One important feature linked to several types of ED is cleft lip and palate. A cleft lip is a condition characterised by a gap in the upper lip.² A cleft palate is an opening in the roof of the mouth.² Together, these diseases affect about 1 in 700 newborns globally.³ When a child has both a cleft lip or palate and ED, it might create more challenges.

Due to the involvement of numerous body parts, children and their families often need therapy from a team of doctors. However, if given the right support, kids with cleft lip or palate and ED 

can lead happy, healthy lives.

Why do ED and cleft lip/palate happen?

Early in pregnancy is when the body's skin, hair, teeth, and face start to develop. Numerous signals that regulate the shape, growth, and connection of cells are necessary for this process. Cleft lip or palate and ED are among the disorders that can result from signal abnormalities.

The role of genes

Researchers have discovered that certain genes have a major impact on ED and cleft lip/palate:

• EDA, EDAR, and EDARADD regulate the development of teeth, sweat glands, and hair follicles.⁴ The most prevalent type of ED, hypohidrotic ED, can result from mutations in these genes⁴
• TP63 is required for the appropriate growth of the hands, feet, and face. Conditions like Rapp-Hodgkin syndrome and EEC syndrome, which often involve cleft lip and/or palate, can result from changes⁵
• Other genes, such as WNT10A, MSX1, and IRF6, have been linked to ED in relation to cleft lip or palate

How do clefts form?

The child's upper lip normally develops between weeks 6 and 7, whereas the palate, or roof of the mouth, normally forms between weeks 7 and 12 of pregnancy.⁶ The result of incorrect tissue joining is a cleft lip or palate. This joining process can be disrupted in ED disorders by the same faulty signals that affect skin, hair, and teeth. Because of this, some newborns are born with both ED and a cleft lip or palate.

Types of ectodermal dysplasia linked with cleft lip and palate

Only a few types are known to be linked with cleft lip and/or palate:

Hypohidrotic ED 

The most common kind. It is also known as Christ-Siemens-Touraine syndrome.⁷ Children may struggle to stay cool because they have fewer sweat glands, sparse hair, and missing teeth. A cleft palate can occasionally form, although it is rare in this variety.

Hidrotic ED 

Also known as Clouston syndrome.⁸ The hair and nails are the main areas affected. Children may have brittle nails and hair loss. A cleft lip or palate is an uncommon consequence of this disease.

Rapp-hodgkin syndrome

Children may be born with a cleft lip and/or palate, sparse hair, small or missing teeth, and reduced sweating ability.

EEC syndrome

This condition has three primary characteristics:

• Ectrodactyly, which is another name for "split hand/foot," describes differences in the hands or feet⁹
• Ectodermal dysplasia symptoms include tooth or hair loss⁹
• A cleft lip and/or palate⁹

Because the symptoms of different types of ED often overlap, doctors often utilise genetic testing to confirm the exact diagnosis. This helps guide care and gives families a better understanding of what to expect.

What are the signs and symptoms?

Children with cleft lip or palate (CLP) and ectodermal dysplasia (ED) may exhibit a variety of characteristics. These can impact daily health as well as the lips, face, skin, hair, and nails.

In the mouth and face, children may have: 

• Lack of teeth (some, many, or all) or "peg-shaped" or small, pointed teeth are unusual forms of cleft lip, cleft palate, or both
• Teeth appear in the mouth later than normal
• A reduced mid-face or a flattened nose are two signs of changes in facial growth

Eating, speaking, and feeling good about one's appearance may become more difficult as a result of these changes. Early dental and surgical care is therefore crucial.

On the skin, hair, and nails, they may have: 

• Lack, fragility, or thinness of scalp and body hair
• Dry, thin skin that is prone to rashes and infections
• Sweating little or not at all makes it harder to cool down and raises the possibility of overheating
• Nails that are easily broken, ridged, or fragile

Everyday impact 

• Babies with cleft palates and missing teeth may have trouble eating and gaining weight
• Recurrent surgeries and speech issues are common in children, which can have an impact on their social and academic lives
• Self-consciousness, low self-esteem, or anxiety about appearance can affect both adults and teenagers

These difficulties extend beyond well-being. They may have an impact on emotional health, friendships, and self-worth. Doctors, dentists, therapists, and counsellors can all be very helpful.

How is it diagnosed?

Early diagnosis is essential. In addition to helping families understand what is going on, it helps doctors arrange the best care and support. The following actions can be taken by doctors to make a diagnosis:

• Clinical examination: The child's skin tone, hair, teeth, and nails are all inspected by an expert
• Genetic testing: A simple genetic test can detect changes in specific genes (such as TP63, EDAR, or EDA). Long-term care can be guided by identifying the specific gene modification, which offers a definitive answer
• Prenatal diagnosis: In some families with a history of ED, prenatal testing may be offered. An ultrasound scan may display a cleft lip or palate, and a genetic test may search for the same gene abnormalities seen in family members
• Dental X-rays: An X-ray of the entire mouth can show whether teeth are missing or erupting. This helps dentists plan treatments for later in life, such as braces, implants, and dentures

Since ED can manifest itself differently in each person, combining these approaches helps to deliver the most accurate picture.

How is it treated? a team approach

Given that ectodermal dysplasia (ED) affects numerous body parts, treatment for ED with cleft lip or palate usually involves a team of specialists working together. We call this an interdisciplinary strategy. The goal is to help children eat, talk, grow, and feel safe as they age.

Surgery

• Repairing cleft lips is typically done during the first few months of birth
• Repairing a cleft palate is frequently done prior to the first birthday
• Additionally, as they get older, some children may need bone grafts or oral surgery to improve both function and appearance

Dental and orthodontic care

• Early solutions: Special dentures or small devices that enhance speaking and chewing can be used to replace lost teeth
• Braces: Orthodontic treatment guides the growth of the jaws and teeth throughout childhood
• Teenagers and older adults who have lost teeth can have them permanently replaced with dental implants

Support for speech and feeding

• Infants with cleft palates may need special bottles or feeding techniques
• Following palate surgery, speech therapy aids in enhancing communication and teaching youngsters how to pronounce words effectively

Care for the skin, hair, and eyes

• Some moisturising creams for dry skin
• Some shampoos or treatments can be prescribed by specialists for thin or weak hair
• Eye doctors can check and treat dryness or irritation in the eyes

Emotional and social support

• Family counselling is just as important as medical treatment since it helps parents and children cope with the frequent treatments
• Families may also contact other individuals who have a similar experience through support groups
• Children can connect with others who have similar experiences through peer networks

Summary

Ectodermal dysplasias (EDs) are a group of rare genetic conditions affecting the skin, hair, teeth, nails, and sweat glands. Some forms are linked to cleft lip and/or palate (CLP), which occurs when the lip or roof of the mouth does not close properly during foetal development. If they occur together, it can lead to difficult conditions that impact a child's eating, speaking, appearance, and self-esteem, among other aspects of their life. 

Symptoms are varied and may vary from cleft lip/palate, cone-shaped teeth or missing teeth, thin hair, dry skin, brittle nails, and sweat resistance. Diagnosis is through a history of clinical features, genetic analysis, prenatal scanning, and X-rays of teeth. Emotional support, speech therapy, dental treatment, and surgery are already making a huge difference in their treatments. There are even special teams and support groups to assist families along the way, so that no one needs to be alone. With the right team of specialists and an early diagnosis, though, children can develop, learn, and flourish.

Meanwhile, there are ongoing studies, and scientists are also innovating newer technologies like regenerative dentistry and gene therapy. There is true hope for the future with all these advancements. At this point, the most crucial thing is to make sure all children and families get the care and support they need from birth to life.