Genetic and phenotypic spectrum in the NONO-associated syndromic disorder.

The non-POU domain-containing octamer-binding (NONO) protein is involved in multiple steps of gene regulation such as RNA metabolism and DNA repair. Hemizygous pathogenic variants in the NONO gene were confirmed to cause a rare X-linked syndromic disorder. Through our in-house diagnostics and subsequent matchmaking, we identified six unrelated male individuals with pathogenic or likely pathogenic NONO variants. For a detailed comparison, we reviewed all published characterizations of the NONO-associated disorder. The combined cohort consists of 16 live-born males showing developmental delay, corpus callosum anomalies, non-compaction cardiomyopathy and relative macrocephaly as leading symptoms. Seven prenatal literature cases were characterized by cardiac malformations. In this study, we extend the phenotypic spectrum through two more cases with epilepsy as well as two more cases with hematologic anomalies. By RNA expression analysis and structural modeling of a new in-frame splice deletion, we reinforce loss-of-function as the pathomechanism for the NONO-associated syndromic disorder. © 2022 The Authors. American Journal of Medical Genetics Part A published by Wiley Periodicals LLC.

Citation

Franziska Roessler, Anita E Beck, Ball Susie, Bartolomaeus Tobias, Amber Begtrup, Saskia Biskup, Oana Caluseriu, Norman Delanty, Christine Fröhlich, Marie T Greally, Maike Karnstedt, Chiara Klöckner, Joanne Kurtzberg, Susanna Schubert, Martin Schulze, Michael Weidenbach, Dominik S Westphal, Maire White, Cordula M Wolf, Jacob Zyskind, Bernt Popp, Vincent Strehlow. Genetic and phenotypic spectrum in the NONO-associated syndromic disorder. American journal of medical genetics. Part A. 2023 Feb;191(2):469-478

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PMID: 36426740

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