Norrie

Norrie disease is a rare genetic disorder that primarily affects the eyes and leads to blindness. It is named after the Scottish ophthalmologist Gordon Norrie, who first described the condition in 1927. The disease is caused by mutations in the NDP gene and is inherited in an X-linked recessive pattern.

Symptoms

The most common symptom of Norrie disease is blindness or severe visual impairment at birth or early infancy. This is caused by an abnormal development of the retina, known as Leber's congenital amaurosis or persistent hyperplastic primary vitreous (PHPV). Other symptoms can include hearing loss, intellectual disability, and behavioral problems.

Causes

Norrie disease is caused by mutations in the NDP gene, which provides instructions for making a protein called norrin. This protein plays a crucial role in the development of the eye and other parts of the body. Mutations in the NDP gene disrupt the function of norrin, leading to the symptoms of Norrie disease.

Diagnosis

The diagnosis of Norrie disease is based on the clinical symptoms, family history, and genetic testing. Genetic testing can confirm the diagnosis by identifying a mutation in the NDP gene.

Treatment

There is currently no cure for Norrie disease. Treatment is supportive and aims to improve the quality of life for individuals with the condition. This can include educational support for those with intellectual disabilities, hearing aids for those with hearing loss, and behavioral therapy for those with behavioral problems.

See also

• List of genetic disorders
• List of eye diseases and disorders