ABSTRACT
The HTML and PDF versions of this Article were updated after publication to remove images of one individual from Figure 1.
ABSTRACT
The original version of this Article contained an error in the spelling of the author Laurence Faivre, which was incorrectly given as Laurence Faive. This has now been corrected in both the PDF and HTML versions of the Article.
ABSTRACT
Chromatin remodeling is of crucial importance during brain development. Pathogenic alterations of several chromatin remodeling ATPases have been implicated in neurodevelopmental disorders. We describe an index case with a de novo missense mutation in CHD3, identified during whole genome sequencing of a cohort of children with rare speech disorders. To gain a comprehensive view of features associated with disruption of this gene, we use a genotype-driven approach, collecting and characterizing 35 individuals with de novo CHD3 mutations and overlapping phenotypes. Most mutations cluster within the ATPase/helicase domain of the encoded protein. Modeling their impact on the three-dimensional structure demonstrates disturbance of critical binding and interaction motifs. Experimental assays with six of the identified mutations show that a subset directly affects ATPase activity, and all but one yield alterations in chromatin remodeling. We implicate de novo CHD3 mutations in a syndrome characterized by intellectual disability, macrocephaly, and impaired speech and language.
Subject(s)
DNA Helicases/genetics , Developmental Disabilities/genetics , Language Disorders/genetics , Megalencephaly/genetics , Mi-2 Nucleosome Remodeling and Deacetylase Complex/genetics , Mutation, Missense , Neurodevelopmental Disorders/genetics , Protein Domains/genetics , Speech Disorders/genetics , Adenosine Triphosphatases , Child, Preschool , Chromatin Assembly and Disassembly , Female , Gene Expression , Genotype , HEK293 Cells , Humans , Intellectual Disability/genetics , Male , Models, Molecular , Phenotype , Whole Genome SequencingABSTRACT
Presented are two patients with autosomal dominant omodysplasia and mutations in the FZD2 gene. The mutations identified have been recently reported, suggesting the possibility of recurrent mutations. The phenotypes of these patients overlap with what has been previously reported, though intellectual disability as seen in our patient is not typical.
