Wolfram Syndrome (DIDMOAD)

What causes Wolfram syndrome

Most cases (Wolfram syndrome type 1) are caused by changes in both copies of the WFS1 gene, which makes wolframin, a protein in the endoplasmic reticulum, the part of the cell that folds proteins. When wolframin does not work, cells experience chronic stress and die, especially insulin-producing beta cells in the pancreas, nerve cells in the optic nerve and brain, and cells in the inner ear.

A rarer form, Wolfram syndrome type 2, is caused by changes in the CISD2 gene and often includes bleeding from stomach ulcers and lacks diabetes insipidus.

Some single WFS1 changes cause milder, dominantly inherited conditions such as hearing loss or diabetes alone.

Symptoms and typical timeline

Diabetes mellitus

Diabetes usually needs insulin, like type 1 diabetes, but is not autoimmune (antibody tests are negative). It tends to have fewer episodes of diabetic ketoacidosis.

Optic atrophy

Damage to the optic nerves causes gradual loss of sharp and color vision, often leading to severe visual impairment within years. Children may first notice problems reading the board or seeing colors.

Diabetes insipidus

Diabetes insipidus (now also called arginine vasopressin deficiency) causes extreme thirst and large volumes of dilute urine.

Hearing loss

Sensorineural hearing loss, often affecting high frequencies first, can progress.

Urinary tract

A neurogenic bladder causes difficulty emptying, incontinence and urinary infections; combined with high urine output from diabetes insipidus, it can cause hydronephrosis and kidney damage.

Neurological and psychiatric features

• unsteadiness and poor coordination (cerebellar ataxia)
• loss of smell and taste
• swallowing difficulties
• breathing problems from brainstem involvement, including sleep apnea
• seizures
• depression, anxiety and psychosis

Other features

• hypogonadism in males, delayed puberty
• growth problems
• gastrointestinal problems

Diagnosis

Wolfram syndrome is suspected when childhood diabetes and optic atrophy occur together, especially with negative diabetes autoantibodies. Diagnosis involves:

• genetic testing for WFS1 and CISD2
• eye examination with optic nerve assessment and visual fields
• hearing tests
• water deprivation testing or blood and urine studies for diabetes insipidus
• bladder and kidney ultrasound and urodynamic tests
• brain MRI, which may show brainstem and cerebellar atrophy
• sleep study for breathing problems

Treatment

There is no approved disease-modifying treatment yet; care focuses on managing each feature, ideally through a multidisciplinary clinic:

• diabetes: insulin and close glucose monitoring
• diabetes insipidus: desmopressin
• vision: low-vision aids, orientation and mobility training, assistive technology
• hearing: hearing aids or cochlear implants
• bladder: timed voiding, intermittent self-catheterization, and medicines
• breathing and swallowing: sleep studies, CPAP or ventilation support, swallowing therapy
• mental health: counseling, psychiatric care and medicines as needed
• hormones: testosterone replacement for hypogonadism
• genetic counseling for families

Clinical trials are testing medicines that reduce cellular stress, such as dantrolene, sodium valproate and GLP-1 receptor agonists, as well as gene and cell therapies.

Outlook

Wolfram syndrome is progressive. Many people live into their 30s or 40s, though the course varies widely. The leading causes of death are breathing problems from brainstem degeneration and complications of urinary tract disease. Specialist care improves quality of life and helps prevent complications.

Frequently asked questions

What is Wolfram syndrome?

Wolfram syndrome is a rare inherited disorder causing childhood diabetes, progressive vision loss from optic atrophy, diabetes insipidus, hearing loss and later neurological problems. It is often called DIDMOAD after its main features.

What does DIDMOAD stand for?

DIDMOAD stands for diabetes insipidus, diabetes mellitus, optic atrophy and deafness, the four main features of Wolfram syndrome. Not everyone develops all four, and many people have additional neurological and urinary problems.

How is Wolfram syndrome inherited?

It is usually autosomal recessive. A child must inherit a faulty WFS1 (or CISD2) gene from each parent. Parents are usually healthy carriers, and each of their children has a 1 in 4 chance of being affected.

How is Wolfram syndrome different from type 1 diabetes?

Both cause insulin-dependent diabetes in childhood. Wolfram syndrome is not autoimmune, so diabetes antibody tests are negative, and it is followed by optic atrophy, diabetes insipidus and hearing loss. Genetic testing confirms the diagnosis.

Is there a cure for Wolfram syndrome?

There is no cure yet. Treatment manages each symptom, such as insulin, desmopressin, vision and hearing support, and bladder and breathing care. Clinical trials are testing medicines and gene therapies aimed at slowing the disease.