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A form of congenital disorders of N-linked glycosylation with characteristics of progressive microcephaly, hypotonia, developmental delay, drug-resistant infantile epilepsy and hepatomegaly. Additional features that may be observed include failure to thrive, pericardial effusion, renal cysts, skeletal dysplasia, facial dysmorphism (frontal bossing, hypertelorism, depressed nasal bridge, low-seated ears, large mouth) and hydrops fetalis. The disease is caused by loss-of-function mutations in the gene ALG9 (11q23).
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