A clustering of heterozygous missense variants in the crucial chromatin modifier WDR5 defines a new neurodevelopmental disorder

Lot Snijders Blok*, Jolijn Verseput, Dmitrijs Rots, Hanka Venselaar, A Micheil Innes, Connie Stumpel, Katrin Õunap, Karit Reinson, Eleanor G Seaby, Shane McKee, Barbara Burton, Katherine Kim, Johanna M van Hagen, Quinten Waisfisz, Pascal Joset, Katharina Steindl, Anita Rauch, Dong Li, Elaine H Zackai, Sarah E SheppardBeth Keena, Hakon Hakonarson, Andreas Roos, Nicolai Kohlschmidt, Anna Cereda, Maria Iascone, Erika Rebessi, Kristin D Kernohan, Philippe M Campeau, Francisca Millan, Jesse A Taylor, Hanns Lochmüller, Martin R Higgs, Amalia Goula, Birgitta Bernhard, Danita J Velasco, Andrew A Schmanski, Zornitza Stark, Lyndon Gallacher, Lynn Pais, Paul C Marcogliese, Shinya Yamamoto, Nicholas Raun, Taryn E Jakub, Jamie M Kramer, Joery den Hoed, Simon E Fisher, Han G Brunner, Tjitske Kleefstra*

*Corresponding author for this work

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Abstract

WDR5 is a broadly studied, highly conserved key protein involved in a wide array of biological functions. Among these functions, WDR5 is a part of several protein complexes that affect gene regulation via post-translational modification of histones. We collected data from 11 unrelated individuals with six different rare de novo germline missense variants in WDR5; one identical variant was found in five individuals and another variant in two individuals. All individuals had neurodevelopmental disorders including speech/language delays (n = 11), intellectual disability (n = 9), epilepsy (n = 7), and autism spectrum disorder (n = 4). Additional phenotypic features included abnormal growth parameters (n = 7), heart anomalies (n = 2), and hearing loss (n = 2). Three-dimensional protein structures indicate that all the residues affected by these variants are located at the surface of one side of the WDR5 protein. It is predicted that five out of the six amino acid substitutions disrupt interactions of WDR5 with RbBP5 and/or KMT2A/C, as part of the COMPASS (complex proteins associated with Set1) family complexes. Our experimental approaches in Drosophila melanogaster and human cell lines show normal protein expression, localization, and protein-protein interactions for all tested variants. These results, together with the clustering of variants in a specific region of WDR5 and the absence of truncating variants so far, suggest that dominant-negative or gain-of-function mechanisms might be at play. All in all, we define a neurodevelopmental disorder associated with missense variants in WDR5 and a broad range of features. This finding highlights the important role of genes encoding COMPASS family proteins in neurodevelopmental disorders.

Original languageEnglish
Article number100157
Number of pages9
JournalHGG advances
Volume4
Issue number1
Early online date1 Nov 2022
DOIs
Publication statusPublished - 12 Jan 2023

Bibliographical note

Acknowledgments:
We thank all included individuals and their families for their contribution to this research project. We thank the late Dr. Kenneth L. Scott for providing the human WDR5 cDNA used in this study. Funding was provided by the Netherlands Organisation for Scientific Research (NWO) Gravitation Grant 24.001.006 to the Language in Interaction Consortium (L.S.B., S.E.F., and H.G.B.), the Max Planck Society (J.d.H. and S.E.F.), and the Netherlands Organisation for Health Research and Development (ZonMw grant 91718310 to T.K.). Funding to J.M.K. was provided by a catalyst grant from the Canadian Rare Disease Models and Mechanisms Network. The research of A.C., M.I., and E.R. was supported by PROGETTEO GENE (GENE = Genomic Analysis Evaluation Network) founded by PROGETTI DI INNOVAZIONE IN AMBITO SANITARIO E SOCIO SANITARIO (BANDO EX DECRETO N. 2713 DEL 28/02/2018). A.Roos and N.K. acknowledge funding from the European Regional Development Fund (ERDF). K.Õ. and K.R. were supported by the Estonian Research Council grants PUT355 and PRG471. The Broad Center for Mendelian Genomics (UM1 HG008900) is funded by the National Human Genome Research Institute with supplemental funding provided by the National Heart, Lung, and Blood Institute under the Trans-Omics for Precision Medicine (TOPMed) program and the National Eye Institute. This work was generated within ITHACA: European Reference Network on Rare Congenital Malformations and Rare Intellectual Disability. Individuals 3 and 4 were part of the DDD study cohort, individual 6 was ascertained through the Care4Rare consortium, and individual 9 was part of the UDP-Vic program. Further information on these cohort studies is included in the supplemental information.

Copyright:
© 2022 The Authors.

Keywords

  • Animals
  • Humans
  • Autism Spectrum Disorder/genetics
  • Drosophila melanogaster/genetics
  • Neurodevelopmental Disorders/genetics
  • Language Development Disorders
  • Cluster Analysis
  • Chromatin
  • Intracellular Signaling Peptides and Proteins/genetics
  • Histone-Lysine N-Methyltransferase/genetics
  • Drosophila Proteins/genetics

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