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Missense variants in the chromatin remodeler CHD1 are associated with neurodevelopmental disability.

J. Med. Genet.2018 Aug;55(8):561-566. Epub 2017 Sep 02
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摘要


BACKGROUND:The list of Mendelian disorders of the epigenetic machinery has expanded rapidly during the last 5 years. A few missense variants in the chromatin remodeler CHD1 have been found in several large-scale sequencing efforts focused on uncovering the genetic aetiology of autism. OBJECTIVES:To explore whether variants in CHD1 are associated with a human phenotype. METHODS:We used GeneMatcher to identify other physicians caring for patients with variants in CHD1. We also explored the epigenetic consequences of one of these variants in cultured fibroblasts. RESULTS:Here we describe six CHD1 heterozygous missense variants in a cohort of patients with autism, speech apraxia, developmental delay and facial dysmorphic features. Importantly, three of these variants occurred de novo. We also report on a subject with a de novo deletion covering a large fraction of the CHD1 gene without any obvious neurological phenotype. Finally, we demonstrate increased levels of the closed chromatin modification H3K27me3 in fibroblasts from a subject carrying a de novo variant in CHD1. CONCLUSIONS:Our results suggest that variants in CHD1 can lead to diverse phenotypic outcomes; however, the neurodevelopmental phenotype appears to be limited to patients with missense variants, which is compatible with a dominant negative mechanism of disease.

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