cystinosis

Cystinosis is a rare genetic disorder that affects the body's ability to recycle the amino acid cystine. It is a lysosomal storage disease, which means that it is caused by the accumulation of cystine within the lysosomes of cells due to a defect in the enzyme cystinosis.

The symptoms of cystinosis typically appear in early childhood and can vary in severity. One of the most common signs is the accumulation of cystine in the kidneys, which can lead to kidney failure if left untreated. Other symptoms include clouding of the cornea, which can lead to vision loss, and bone deformities.

There are three types of cystinosis: nephropathic cystinosis, intermediate cystinosis, and ocular cystinosis. Nephropathic cystinosis is the most severe form and occurs in about 50% of cases. It can lead to end-stage renal disease and the need for a kidney transplant by the age of 10. Intermediate cystinosis is less severe and typically occurs in younger individuals. Ocular cystinosis is a milder form that primarily affects the eyes.

Cystinosis is inherited in an autosomal recessive pattern, which means that a person must inherit two copies of the mutated gene (one from each parent) to develop the condition. There is no cure for cystinosis, but treatment can help manage its symptoms. This includes medications that help reduce cystine levels in the body, as well as treatment for complications such as kidney disease and vision loss. Research is ongoing to explore the development of new treatments, including gene therapy.