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A rare genetic dysostosis syndrome with characteristics of bilateral symmetrical preaxial brachydactyly associated with hyperphalangy, motor developmental delay and intellectual disability, growth retardation, sensorineural hearing loss, dental abnormalities (including misalignment of teeth, talon cusps, microdontia), and facial dysmorphism that includes plagiocephaly, round face, hypertelorism, malar hypoplasia, malformed ears, microstomia and micro/retrognathia. There is evidence the disease is caused by homozygous mutation in the CHSY1 gene on chromosome 15q26.
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