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A rare genetic syndromic intellectual disability disorder with characteristics of global development delay with very limited or absent speech and language, severe intellectual disability, long slender fingers, ocular abnormalities (typically strabismus or hypermetropia) and facial dysmorphism that includes a grimacing facial expression, a tubular-shaped nose with a prominent, broad base and tip and other variable features, such as broad forehead, hypertelorism, deep-set eyes, narrow palpebral fissures, short philtrum and/or broad mouth. Caused by heterozygous mutation in the GATAD2B gene on chromosome 1q21.
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