25/02/2026
Here’s a clear overview of the rare disease cystinosis — including key medical facts + visual examples of what this condition looks like in the body.
🧬 What Is Cystinosis?
It’s a rare genetic lysosomal storage disease caused by mutations in the CTNS gene, which codes for a protein (cystinosin) that normally helps transport the amino acid cystine out of lysosomes.
When this protein doesn’t work correctly, cystine accumulates inside cells and forms crystals, damaging organs over time. �
Cystinosis Research Network +1
Inheritance: Autosomal recessive (both parents must carry a mutated gene). �
Cystinosis Research Foundation
Incidence: Approximately 1 in 100,000–200,000 live births. �
Cleveland Clinic
Main affected organs: Kidneys and eyes, but many organs can be involved. �
National Organization for Rare Disorders
There are three major forms:
Infantile nephropathic cystinosis – most common and severe form; begins in infancy. �
Cleveland Clinic
Intermediate (juvenile) cystinosis – milder onset later in childhood. �
Cleveland Clinic
Non-nephropathic (ocular) cystinosis – primarily affects eyes. �
Cleveland Clinic
🚨 Key Clinical Features
Common medical effects include:
✔ Progressive kidney dysfunction (Fanconi syndrome, eventual renal failure) �
✔ Cystine crystal accumulation in tissues including the cornea (eyes) �
✔ Photophobia (light sensitivity) from corneal crystals �
✔ Growth failure, bone abnormalities, hypothyroidism, muscle weakness, etc. �
Cleveland Clinic
Cystinosis Research Network
Cleveland Clinic
Cystinosis Research Network
📸 Clinical and Diagnostic Images
🔹 Cystine Crystals in Tissues
These crystals can form in many tissues (liver, kidney, cornea, bone marrow). They are the hallmark of the disease.
Crystals visible in patient tissues such as bone marrow and other organs.
🔹 Eye (Cornea) Involvement
Cystine crystals accumulate in the cornea of the eye, which is important diagnostically and contributes to eye symptoms.
Photographs and clinical images showing crystal deposits affecting the cornea.
🧠 Pathophysiology (How the Disease Develops)
✔ In normal cells, cystine is transported out of lysosomes (cell “recycling centers”).
✔ In cystinosis, this transport fails → cystine builds up in lysosomes → cystine crystals form. �
Cystinosis Research Foundation
This accumulation damages cells and impairs organ function over time.
💊 Management & Treatment
There’s no cure, but progression can be slowed:
Cysteamine therapy — reduces cystine levels inside cells. �
Cleveland Clinic
Corneal cysteamine eye drops — help dissolve eye crystals. �
Cleveland Clinic
Kidney transplantation — may be needed if kidney failure develops. �
Cleveland Clinic
Early detection and treatment significantly improve quality of life and long-term outcomes. �
Cleveland Clinic
🧾 Summary
Feature
Details
Disease Type
Genetic metabolic lysosomal storage disorder
Gene Involved
CTNS gene (cystinosin)
Hallmark
Cystine crystal accumulation in cells
Main Organs Affected
Kidneys, eyes, muscles, endocrine organs
Inheritance
Autosomal recessive
Treatment
Cysteamine therapy, symptomatic management.
