Missense variants in the Arg206 residue of HNRNPH2: Further evidence of causality and expansion of the phenotype

Am J Med Genet A. 2020 Apr;182(4):823-828. doi: 10.1002/ajmg.a.61486. Epub 2020 Jan 14.

Abstract

Missense variants in HNRNPH2 cause Bain type syndromic X-linked intellectual disability (XLID). To date, only six affected females and three affected males have been reported in the literature, and the phenotype has yet to be delineated in detail. Here, we report on a 35-year-old female with a novel de novo variant in HNRNPH2, providing further evidence that missense changes in the nuclear localization sequence cause Bain type XLID and that aminoacid 206 likely represents a mutational hotspot. We expand the phenotype of Bain type XLID to include breathing, sleep and movement disorders, cerebellar vermis hypoplasia, stereotypies, and hypersensitivity to noise. Our data indicate that the phenotype may be broader and more variable than initially reported, and suggest Rett syndrome as a possible differential diagnosis.

Keywords: Bain type syndromic mental retardation; HNRNPH1; HNRNPH2; Rett syndrome; exome sequencing; intellectual disability.

Publication types

  • Case Reports
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Abnormalities, Multiple / etiology*
  • Abnormalities, Multiple / pathology
  • Adult
  • Exome
  • Female
  • Heterogeneous-Nuclear Ribonucleoprotein Group F-H / genetics*
  • Humans
  • Intellectual Disability / etiology*
  • Intellectual Disability / pathology
  • Mental Retardation, X-Linked / etiology*
  • Mental Retardation, X-Linked / pathology
  • Mutation, Missense*
  • Phenotype

Substances

  • HNRNPH2 protein, human
  • Heterogeneous-Nuclear Ribonucleoprotein Group F-H