Understanding Congenital Tufting Enteropathy (CTE)

It is incredibly overwhelming to face a diagnosis like Congenital Tufting Enteropathy (CTE) shortly after your baby is born. Seeing your infant struggle with severe, persistent diarrhea can be frightening, but please know that you are not alone. While CTE is a rare and serious condition, it is a recognized medical diagnosis with established ways to manage it and support your child’s growth ^[1][2].

Understanding the Intestinal Barrier

To understand CTE, it helps to think of the small intestine as a highly organized filter. In a healthy baby, the lining of the intestine is covered in tiny, finger-like projections called villi. These villi increase the surface area available to absorb nutrients from milk or formula. The cells that make up this lining (called enterocytes) are normally held together tightly, forming a smooth, waterproof barrier that keeps fluids in the body while pulling nutrients through ^[3][4].

In CTE, the instructions for building this barrier are “miswritten” in the baby’s DNA. Instead of forming a smooth, efficient surface, the cells become disorganized. They begin to clump together in small, raised clusters called tufts ^[4][1]. Because these cells are crowded and improperly connected, the intestinal lining cannot do its job. Instead of absorbing fluids and nutrients, the intestine allows them to pass straight through, resulting in intractable diarrhea (diarrhea that does not stop even when the baby isn’t eating) ^[5][1].

Why the “Tufts” Form

The “tufts” that give this condition its name are more than just physical bumps; they are a sign that the cells have lost their internal compass.

• Cell Connections: The mechanism can be complex, but essentially, in EPCAM-related CTE, the instructions for cell adhesion and polarity are altered, causing the cells to lose their normal organization and form tufts ^[6][7].
• Malabsorption: Because the surface is so disorganized, the small intestine often develops villous atrophy—a condition where the “fingers” that absorb nutrients flatten out. This makes it very difficult for your baby to get the calories and minerals they need from standard feeding alone ^[8][4].

The Role of Genetics

CTE is a genetic condition, usually inherited in an autosomal recessive pattern. This means a child must inherit one changed gene from each parent to have the disorder ^[1]. If both parents are carriers, each pregnancy has a 1-in-4 (25%) chance of being affected. A genetic counselor can help you navigate this. Doctors have identified two primary genes responsible for CTE:

EPCAM (Isolated CTE)

The EPCAM gene provides instructions for a protein that acts like a “stabilizer” for intestinal cells. When this gene doesn’t work, the cells cannot stay organized or maintain their barrier ^[9][7]. This is often called “isolated” CTE because the symptoms are usually limited to the digestive system and the severe diarrhea that comes with it ^[5].

SPINT2 (Syndromic CTE)

The SPINT2 gene helps control certain enzymes (proteases) in the gut. If this gene is mutated, the lack of proper regulation of these enzymes leads to the characteristic epithelial abnormalities in the gut ^[7][10]. This is sometimes called “syndromic” CTE because it can affect other parts of the body. Babies with this form may sometimes (but not always) have:

• Atresia: Blockages in the nose (choanal atresia) or the anus (anal atresia) ^[5].
• Eye Issues: Such as corneal erosions or other vision-related concerns ^[11].

How Common is CTE?

CTE is very rare, which is why it often takes time to reach a diagnosis. It is estimated to affect approximately 1 in every 50,000 to 100,000 live births ^[2]. Because it is so rare, your care team may include specialists in pediatric gastroenterology and genetics who have experience with rare intestinal diseases.

Looking Ahead

While the biological mechanism of CTE sounds complex, identifying the specific gene involved is a major step forward. It allows your medical team to tailor a care plan that addresses your baby’s specific needs—whether that involves specialized nutrition or monitoring for other symptoms ^[12]. Although many children with CTE require long-term nutritional support through an IV (parenteral nutrition), some children are eventually able to decrease this support as they grow older ^[13]. Your doctors will work with you to manage the condition and help your baby grow as strongly as possible.