De Novo Variants in SPOP Cause Two Clinically Distinct Neurodevelopmental Disorders

Maria J. Nabais Sá, Geniver El Tekle, Arjan P.M. de Brouwer, Sarah L. Sawyer, Daniela del Gaudio, Michael J. Parker, Farah Kanani, Marie José H. van den Boogaard, Koen van Gassen, Margot I. Van Allen, Klaas Wierenga, Gabriela Purcarin, Ellen Roy Elias, Amber Begtrup, Jennifer Keller-Ramey, Tiziano Bernasocchi, Laurens van de Wiel, Christian Gilissen, Hanka Venselaar, Rolph PfundtLisenka E.L.M. Vissers, Jean Philippe P. Theurillat*, Bert B.A. de Vries

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Recurrent somatic variants in SPOP are cancer specific; endometrial and prostate cancers result from gain-of-function and dominant-negative effects toward BET proteins, respectively. By using clinical exome sequencing, we identified six de novo pathogenic missense variants in SPOP in seven individuals with developmental delay and/or intellectual disability, facial dysmorphisms, and congenital anomalies. Two individuals shared craniofacial dysmorphisms, including congenital microcephaly, that were strikingly different from those of the other five individuals, who had (relative) macrocephaly and hypertelorism. We measured the effect of SPOP variants on BET protein amounts in human Ishikawa endometrial cancer cells and patient-derived cell lines because we hypothesized that variants would lead to functional divergent effects on BET proteins. The de novo variants c.362G>A (p.Arg121Gln) and c. 430G>A (p.Asp144Asn), identified in the first two individuals, resulted in a gain of function, and conversely, the c.73A>G (p.Thr25Ala), c.248A>G (p.Tyr83Cys), c.395G>T (p.Gly132Val), and c.412C>T (p.Arg138Cys) variants resulted in a dominant-negative effect. Our findings suggest that these opposite functional effects caused by the variants in SPOP result in two distinct and clinically recognizable syndromic forms of intellectual disability with contrasting craniofacial dysmorphisms.

Original languageEnglish
Pages (from-to)405-411
Number of pages7
JournalAmerican Journal of Human Genetics
Volume106
Issue number3
DOIs
Publication statusPublished - 5 Mar 2020

Keywords

  • BET protein
  • craniofacial dysmorphisms
  • de novo mutation
  • germ line mutation
  • intellectual disabilty syndrome
  • macrocephaly
  • microcephaly
  • missense mutation
  • neurodevelopmental disorder
  • SPOP
  • Humans
  • Child, Preschool
  • Infant
  • Male
  • Mutation, Missense
  • Young Adult
  • Facies
  • Female
  • Nuclear Proteins/genetics
  • Child
  • Repressor Proteins/genetics
  • Intellectual Disability/genetics
  • Adolescent
  • Skull/abnormalities
  • Neurodevelopmental Disorders/genetics

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