EGF-related primary hypomagnesemia with intellectual disability

EGF-related primary hypomagnesemia with intellectual disability is an extremely rare genetic disorder caused by mutations in the EGF gene (encoding epidermal growth factor), which plays a critical role in magnesium reabsorption in the kidney. The condition is characterized by renal magnesium wasting leading to chronic hypomagnesemia (abnormally low blood magnesium levels). Magnesium is essential for many body functions, including nerve and muscle function, and persistent deficiency can lead to a range of symptoms including seizures, muscle cramps, and tetany. Affected individuals typically present in infancy or early childhood with seizures related to low magnesium levels, as well as intellectual disability of variable severity. The neurological and cognitive impairment may be related both to the effects of chronic magnesium deficiency on the developing brain and to the broader role of EGF signaling in neurodevelopment. Additional features may include psychomotor developmental delay. Treatment is primarily supportive and focuses on magnesium supplementation, which may be given orally or intravenously depending on the severity of hypomagnesemia. Lifelong magnesium replacement therapy is typically required to maintain adequate serum magnesium levels and prevent complications such as seizures. Early diagnosis and consistent treatment are important to minimize the impact on neurological development, although intellectual disability may persist despite adequate magnesium correction. The condition follows an autosomal recessive inheritance pattern, meaning that both copies of the EGF gene must carry a pathogenic variant for the disease to manifest.

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