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A rare genetic immuno-osseous dysplasia disorder with characteristics of pre and post-natal growth retardation, hypotonia, borderline to moderate intellectual disability, retinal dystrophy, spondyloepiphyseal dysplasia (epiphyseal dysplasia, epiphyses ossification delay, vertebral changes) and skeletal anomalies (brachydactyly, fifth finger clinodactyly). Also associated are humeral immunodeficiency with inability to generate specific antibodies and low circulating B-cells, craniofacial dysmorphism that typically includes microcephaly, hypertelorism, long palpebral fissures, prominent eyelashes, a narrow, tubular, upturned nose with hypoplastic alae nasi, long philtrum and thin upper lip. There is evidence the disease is caused by compound heterozygous mutation in the RNU4ATAC gene on chromosome 2q14.
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