A de novo CHD3 variant in a child with intellectual disability, autism, joint laxity, and dysmorphisms

BACKGROUND: Chromodomain helicase DNA-binding (CHD) proteins play important roles in developmental processes. CHD3, a member of the CHD family of proteins, was reported to be a cause of a neurodevelopmental syndrome by Snijders Blok et al. , but only a small number of probands have been reported. CASE REPORT: The patient was a 9-year-old female with severe intellectual disability, speech impairment, autism, joint laxity and dysmorphisms. Whole exome sequencing revealed a de novo missense variant in CHD3 (NM₀01005273: exon18: c. 2896C > T: p. R966W). CONCLUSION: We report a case with a pathogenic variant in the CHD3 gene. Our report indicates that CHD3 analysis is helpful for diagnosis of the cases with neurodevelopmental disorders, joint laxity, and coarse facial phenotype.