Oculocerebrorenal syndrome of Lowe

Oculocerebrorenal syndrome of Lowe, also known as Lowe syndrome or OCRL (oculocerebrorenal) syndrome, is a rare X-linked multisystem disorder that primarily affects the eyes, brain, and kidneys. It is caused by mutations in the OCRL gene located on the X chromosome, which encodes the enzyme phosphatidylinositol 4,5-bisphosphate 5-phosphatase. Because of its X-linked inheritance, the condition almost exclusively affects males, while females are typically carriers who may show mild features such as lens opacities. The hallmark features of Lowe syndrome include congenital bilateral cataracts (present at birth), intellectual disability of varying severity, and renal tubular dysfunction (renal Fanconi syndrome). The congenital cataracts often lead to glaucoma, and many affected individuals develop significant visual impairment. Neurological manifestations include hypotonia (reduced muscle tone) from birth, intellectual disability ranging from mild to severe, behavioral difficulties, and seizures in some patients. The renal Fanconi syndrome leads to loss of important substances in the urine, including bicarbonate, amino acids, phosphate, and low-molecular-weight proteins, which can progress to chronic kidney disease over time. Additional features may include short stature, joint hypermobility, vitamin D-resistant rickets due to phosphate wasting, and a tendency to develop renal cysts. There is currently no cure for Lowe syndrome, and treatment is supportive and symptomatic. Management typically involves early cataract surgery, treatment of glaucoma, physical and occupational therapy for hypotonia and developmental delays, and medical management of renal tubular acidosis with bicarbonate supplementation, phosphate replacement, and vitamin D supplementation to prevent or treat rickets. Seizures are managed with standard anticonvulsant medications. Regular monitoring of kidney function is essential, as progressive renal insufficiency may develop, particularly in adolescence and adulthood. A multidisciplinary approach involving ophthalmology, nephrology, neurology, and developmental specialists is recommended for optimal care.

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