De Novo Truncating Mutations in the Kinetochore-Microtubules Attachment Gene CHAMP1 Cause Syndromic Intellectual Disability

Bertrand Isidor, Sébastien Küry, Jill A. Rosenfeld, Thomas Besnard, Sébastien Schmitt, Shelagh Joss, Sally J. Davies, Robert Roger Lebel, Alex Henderson, Christian P. Schaaf, Haley E. Streff, Yaping Yang, Vani Jain, Nodoka Chida, Xenia Latypova, Cédric Le Caignec, Benjamin Cogné, Sandra Mercier, Marie Vincent, Estelle ColinDominique Bonneau, Anne Sophie Denommé, Philippe Parent, Brigitte Gilbert-Dussardier, Sylvie Odent, Annick Toutain, Amélie Piton, Christian Dina, Audrey Donnart, Pierre Lindenbaum, Eric Charpentier, Richard Redon, Kenji Iemura, Masanori Ikeda, Kozo Tanaka, Stéphane Bézieau

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

A rare syndromic form of intellectual disability with impaired speech was recently found associated with mutations in CHAMP1 (chromosome alignment-maintaining phosphoprotein 1), the protein product of which is directly involved in microtubule-kinetochore attachment. Through whole-exome sequencing in six unrelated nonconsanguineous families having a sporadic case of intellectual disability, we identified six novel de novo truncating mutations in CHAMP1: c.1880C>G p.(Ser627*), c.1489C>T; p.(Arg497*), c.1876_1877delAG; p.(Ser626Leufs*4), c.1043G>A; p.(Trp348*), c.1002G>A; p.(Trp334*), and c.958_959delCC; p.(Pro320*). Our clinical observations confirm the phenotypic homogeneity of the syndrome, which represents therefore a distinct clinical entity. Besides, our functional studies show that CHAMP1 protein variants are delocalized from chromatin and are unable to bind to two of its direct partners, POGZ and HP1. These data suggest a pathogenic mechanism of the CHAMP1-associated intellectual disability syndrome mediated by direct interacting partners of CHAMP1, several of which are involved in chromo/kinetochore-related disorders.

Original languageEnglish
Pages (from-to)354-358
Number of pages5
JournalHuman mutation
Volume37
Issue number4
DOIs
Publication statusPublished - 2016 Apr 1

Keywords

  • CHAMP1
  • HP1
  • Intellectual disability
  • Kinetochores
  • Microcephaly
  • Microtubules
  • POGZ

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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