Phenotypic expansion and variable expressivity in individuals with JARID2-related intellectual disability: A case series

Clin Genet. 2022 Aug;102(2):136-141. doi: 10.1111/cge.14149. Epub 2022 May 18.


Loss of function variants in JARID2 were recently reported in 16 patients with a neurodevelopmental disorder characterized by delays, intellectual and learning disability, autism, behavioral abnormalities, and dysmorphic features. Most cases were de novo, with only one variant inherited from an affected parent. Here, we present seven additional individuals from five families with pathogenic or likely pathogenic JARID2 variants, confirming this gene-disease association and highlighting palatal abnormalities and heart defects as part of the phenotype. In addition, we report inheritance of JARID2 variants from mildly affected parents, demonstrating the variable expressivity of the disease. We also note the high prevalence of intragenic JARID2 copy number variants, emphasizing the importance of exon-level analysis.

Keywords: JARID2; clinical genetics; intellectual disability; molecular diagnosis.

MeSH terms

  • Autistic Disorder* / genetics
  • DNA Copy Number Variations
  • Exons
  • Humans
  • Intellectual Disability* / genetics
  • Intellectual Disability* / pathology
  • Phenotype
  • Polycomb Repressive Complex 2 / genetics


  • JARID2 protein, human
  • Polycomb Repressive Complex 2