Denys Drash Syndrome

Overview

Denys Drash syndrome is a very rare genetic condition that mainly affects the kidneys, the sex organs, and the risk of a childhood kidney cancer called Wilms tumor. It is caused by a change in a gene called WT1, which helps the kidneys and sex organs form and helps control how certain cells grow. Children with Denys Drash syndrome often have kidney problems that leak protein into the urine, and some develop Wilms tumor. They may also have sex organs that do not look clearly male or female, or other differences in how the sex organs developed. Care usually involves a team of specialists and regular check-ups.

No. Denys Drash syndrome is extremely rare. Most general doctors will never see a case, so care is usually led by children's kidney, cancer, genetics, and hormone specialists.

It mainly affects infants and young children. It can affect children with male or female chromosomes, but the genital differences are more common in children with XY chromosomes. Some children with XX chromosomes have typical female genitals but still have kidney problems and a higher risk of Wilms tumor.

Symptoms

Common symptoms

• Swelling around the eyes, legs, or belly, caused by fluid building up
• Frothy or foamy urine, which can be a sign of protein leaking into the urine
• Passing less urine than usual
• Poor feeding, vomiting, or slow weight gain in a baby or young child
• High blood pressure, which often causes no symptoms at first
• Genitals that do not look clearly male or female, undescended testes, or a hernia in the groin
• A lump or swelling in the belly, which may be a sign of a kidney tumor

Symptoms in children

• Swelling or puffiness that may be most noticeable in the morning
• Tiredness, irritability, or poor growth
• Frequent infections or symptoms that seem severe for a young child
• Blood in the urine, which may be visible or found on a urine test
• A firm, painless lump in the abdomen
• Signs of kidney failure, such as very little urine, vomiting, or feeling very unwell

Causes

Main causes

• A change, also called a variant or mutation, in the WT1 gene. This gene plays an important role in how the kidneys and sex organs develop and in controlling cell growth.
• In most children the gene change is new (de novo), meaning it happened by chance and was not passed on by either parent.
• In some families, a WT1 gene change can be inherited in an autosomal dominant pattern. This means a parent who carries the change has a 1 in 2 chance of passing it to each child.

Risk factors

• A known WT1 gene variant in the family
• A parent or sibling with a WT1-related condition
• Having a child with kidney problems plus genital differences, or with Wilms tumor at a young age
• Nothing a parent did or did not do during pregnancy causes Denys Drash syndrome

When to see a doctor

See a doctor urgently if:

• A baby or child has new swelling, foamy urine, blood in the urine, or is passing much less urine
• A child has a fever and is known to have kidney disease or is having cancer treatment
• You notice a new lump in a child's abdomen
• A child has vomiting, poor feeding, or is much sleepier or less responsive than usual
• A home blood pressure reading is much higher than the child's usual range
• There are concerns about the appearance of a baby's genitals or a testis that cannot be felt in the scrotum

Book a routine appointment if:

• You have a family history of a WT1 gene variant and want to discuss testing
• Your child has a known WT1 variant and is due for kidney, blood pressure, growth, or tumor surveillance checks
• You need help understanding test results, treatment options, or genetic counselling
• You have questions about school, diet, vaccines, or medicines
• You or your child feel overwhelmed and want emotional or practical support

Diagnosis

There is no single test that confirms Denys Drash syndrome. Doctors suspect it when a young child has a pattern of kidney disease, genital differences, or Wilms tumor. The diagnosis is confirmed with genetic testing, usually alongside urine tests, blood tests, kidney scans, and sometimes a kidney biopsy. A specialist team will also check blood pressure, growth, and how the sex organs have developed.

Tests that may be done

• Urine tests to check for protein and blood
• Blood tests to check kidney function, protein levels, salts, and blood count
• Blood pressure checks, often repeated over time
• Ultrasound scans of the kidneys and abdomen
• Genetic testing for changes in the WT1 gene
• A chromosome test, sometimes called a karyotype, to look at the child's sex chromosomes
• A kidney biopsy in some cases, where a tiny sample of kidney tissue is examined
• Other imaging, such as CT or MRI, if a kidney tumor is suspected

What to expect at your appointment

You will likely meet several specialists, including children's kidney doctors, cancer doctors, genetics experts, hormone specialists, and sometimes surgeons. Your child may need repeated tests and scans. Genetic counselling can help you understand what the results mean for your child and for other family members. This can feel like a lot at once, so ask for clear explanations and written information.

Treatment

Care for Denys Drash syndrome is tailored to each child. The main goals are to protect the kidneys, treat Wilms tumor if it is present, support normal growth and development, and prevent or manage complications. Because the condition is rare, care is usually led by a specialist centre with a team that works together.

Self-care at home

• Keep all specialist and surveillance appointments, even when your child seems well
• Follow the team's advice about tracking weight, swelling, urine output, and blood pressure at home
• Give medicines exactly as prescribed and ask before starting any over-the-counter medicine, vitamin, or herbal product
• Ask your pharmacist or doctor which everyday pain or cold medicines are safe for your child's kidneys
• Follow any advice about salt, fluid, protein, and calories from your child's dietitian
• Keep routine vaccinations up to date and ask the specialist team about any extra vaccines
• Help your child stay active within the limits advised by the team
• Wash hands well and avoid people with infections when your child's immune system is low
• Ask for a school care plan and talk with teachers about what to do in an emergency

Medical treatments

Treatment is planned by the specialist team and may include medicines to lower blood pressure, reduce protein loss from the kidneys, remove extra fluid, and treat infections. Children with kidney failure may need dialysis, a machine that filters the blood, or a kidney transplant. If Wilms tumor is found, treatment may include surgery, chemotherapy, or radiotherapy, guided by children's cancer specialists. Hormone support and careful decisions about genital surgery may be offered when needed. There is no single medicine that cures the underlying genetic condition, so care focuses on managing each part of the condition.

When is surgery considered?

Surgery may be needed to remove a Wilms tumor or, in some cases, a kidney at high risk of cancer. Decisions about preventive kidney removal are complex and are made with the specialist team. Surgery to adjust the genitals is highly individual, is not always needed, and is usually discussed carefully over time with parents, the child when old enough, and a specialist team.

Living with this condition

Life with Denys Drash syndrome often includes many appointments, blood tests, urine tests, blood pressure checks, growth checks, and ultrasound scans. Some children need long-term kidney care or a transplant. Families often need to plan around treatment and may need extra support at school and at home. Your specialist team can help you build a routine and know what to watch for.

Lifestyle tips

• Follow the dietitian's advice about salt, fluid, protein, and calories if any changes are needed
• Encourage safe physical activity and play, and ask the team about any limits
• Keep good hand hygiene and avoid unnecessary exposure to infections when advised
• Plan school and travel with the specialist team, including medicine and emergency plans
• Keep a simple record of appointments, test results, medicines, and questions
• Ask for help with transport, finances, childcare, or schooling if appointments become hard to manage

Diet and exercise

There is no single diet that suits every child with Denys Drash syndrome. A dietitian can advise on salt, fluid, protein, and calorie needs, especially if the kidneys are not working well or if a child is growing slowly. Physical activity is encouraged as part of normal childhood, but ask the team about contact sports or heavy lifting if your child has an enlarged kidney, a tumor, or has had surgery.

Mental health and emotional wellbeing

A rare diagnosis can bring fear, grief, exhaustion, and uncertainty. Parents and carers may feel overwhelmed, and siblings may feel worried or left out. Children may need help understanding their body and their care. These feelings are normal, and support is available. If you or your child feel unable to cope or have thoughts of self-harm, contact your local emergency number or a crisis support service right away.

Prevention

The genetic change that causes Denys Drash syndrome cannot be prevented. If a WT1 variant is known in your family, genetic counselling can help you understand the chance of passing it on and discuss testing options. For children with a known WT1 variant, regular surveillance can help find kidney problems or Wilms tumor early, when treatment is often more effective.

Vaccines

Children should receive routine childhood vaccines according to local guidance. Children with kidney disease, dialysis, or a transplant may need extra or different vaccines, so always check with the specialist team before any vaccination.

Screening programmes

Children with a known WT1 variant usually need regular blood pressure checks, urine tests for protein, kidney ultrasound scans, and sometimes abdominal ultrasound surveillance for Wilms tumor. Growth, development, and genital health are also checked. The exact schedule is set by the specialist team.

Complications

If left untreated

• Progressive kidney damage that can lead to kidney failure and the need for dialysis or a transplant
• High blood pressure that can strain the heart and blood vessels
• Infections, especially when the kidneys leak protein or the immune system is weakened
• Blood clots, which are more likely with some kidney diseases
• Poor growth and nutrition
• Wilms tumor that grows or spreads if not found and treated
• Difficulties with sex development, fertility, and body image
• Emotional and practical strain on the child and family

Long-term outlook

Denys Drash syndrome is a serious condition that needs long-term specialist care, and outcomes vary from child to child. Many children can live well with early treatment, careful monitoring, and support. Some will need a kidney transplant, and some will need treatment for Wilms tumor. Regular follow-up helps the team catch problems early and adjust care. Talk with your child's specialist team about what to expect for your child, because every case is different.

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