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Further delineation of the phenotypic spectrum associated with hemizygous loss-of-function variants in NONO.

Am J Med Genet A. 2020 Apr;182(4):652-658. doi:10.1002/ajmg.a.61466. Epub 2019 Dec 28
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摘要


The non-POU domain containing, octamer-binding gene, NONO, is located on chromosome Xq13.1 and encodes a member of a small family of RNA and DNA binding proteins that perform a variety of tasks involved in RNA synthesis, transcriptional regulation and DNA repair. Hemizygous loss-of-function variants in NONO have been shown to cause mental retardation, X-linked, syndromic 34 in males. Features of this disorder can include a range of neurodevelopmental phenotypes, left ventricular noncompaction (LVNC), congenital heart defects, and CNS anomalies. To date only eight cases have been described in the literature. Here we report two unrelated patients and a miscarried fetus with loss-of-function variants in NONO. Their phenotypes, and a review of previously reported cases, demonstrate that hemizygous loss-of-function variants in NONO cause a recognizable genetic syndrome. The cardinal features of this condition include developmental delay, intellectual disability, hypotonia, macrocephaly, structural abnormalities affecting the corpus callosum and/or cerebellum, LVNC, congenital heart defects, and gastrointestinal/feeding issues. This syndrome also carries an increased risk for strabismus and cryptorchidism and is associated with dysmorphic features that include an elongated face, up/down-slanted palpebral fissures, frontal bossing, and malar hypoplasia.

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