Further delineation of phenotypic spectrum of SCN2A-related disorder.
Ruth RichardsonDiana BaralleChristopher BennettTracy BriggsEmilia K BijlsmaJill Clayton-SmithPanayiotis ConstantinouNicola FouldsJoanna JarvisRosalyn JewellDiana S JohnsonMeriel McEntagartMichael J ParkerJessica A RadleyLisa RobertsonClaudia RuivenkampJulie W RuttenJames TellezPeter D TurnpennyValerie WilsonMichael WrightMeena BalasubramanianPublished in: American journal of medical genetics. Part A (2021)
SCN2A-related disorders include intellectual disability, autism spectrum disorder, seizures, episodic ataxia, and schizophrenia. In this study, the phenotype-genotype association in SCN2A-related disorders was further delineated by collecting detailed clinical and molecular characteristics. Using previously proposed genotype-phenotype hypotheses based on variant function and position, the potential of phenotype prediction from the variants found was examined. Patients were identified through the Deciphering Developmental Disorders study and gene matching strategies. Phenotypic information and variant interpretation evidence were collated. Seventeen previously unreported patients and five patients who had been previously reported (but with minimal phenotypic and segregation data) were included (10 males, 12 females; median age 10.5 years). All patients had developmental delays and the majority had intellectual disabilities. Seizures were reported in 15 of 22 (68.2%), four of 22 (18.2%) had autism spectrum disorder and no patients were reported with episodic ataxia. The majority of variants were de novo. One family had presumed gonadal mosaicism. The correlation of the use of sodium channel-blocking antiepileptic drugs with phenotype or genotype was variable. These data suggest that variant type and position alone can provide some predictive information about the phenotype in a proportion of cases, but more precise assessment of variant function is needed for meaningful phenotype prediction.
Keyphrases
- autism spectrum disorder
- end stage renal disease
- intellectual disability
- newly diagnosed
- ejection fraction
- prognostic factors
- peritoneal dialysis
- gene expression
- patient reported outcomes
- attention deficit hyperactivity disorder
- early onset
- transcription factor
- machine learning
- social media
- copy number
- climate change
- clinical evaluation