Enamel-renal syndrome

Enamel-renal syndrome (also known as amelogenesis imperfecta and nephrocalcinosis, or AI-nephrocalcinosis syndrome) is a rare genetic disorder characterized by the combination of defective tooth enamel formation (amelogenesis imperfecta) and kidney calcifications (nephrocalcinosis). The condition is caused by mutations in the FAM20A gene, which encodes a pseudokinase involved in biomineralization processes. The dental features include severely hypoplastic or absent enamel, delayed tooth eruption, intrapulpal calcifications, and gingival hyperplasia. The teeth may appear rough, discolored, and are highly susceptible to decay. The renal component involves bilateral nephrocalcinosis, which is the deposition of calcium in the kidney tissue, typically detected on ultrasound or imaging studies. In most cases, kidney function remains relatively preserved, though monitoring is important. Additional features may include gingival fibromatosis (overgrowth of gum tissue), ectopic calcifications in other soft tissues, and failure of tooth eruption. The condition affects both the primary (baby) and permanent teeth. Diagnosis is based on clinical findings, dental and renal imaging, and can be confirmed through molecular genetic testing of the FAM20A gene. There is currently no cure for enamel-renal syndrome. Treatment is supportive and multidisciplinary, involving dental rehabilitation (crowns, prosthetics, or implants), management of gingival overgrowth, and regular monitoring of kidney function and nephrocalcinosis through periodic renal ultrasound and blood tests. Early diagnosis allows for appropriate dental care planning and renal surveillance to prevent complications.

Common questions about Enamel-renal syndrome