DNA methylation episignature for Witteveen-Kolk syndrome due to SIN3A haploinsufficiency

  • Jet Coenen-van der Spek
  • , Raissa Relator
  • , Jennifer Kerkhof
  • , Haley McConkey
  • , Michael A. Levy
  • , Matthew L. Tedder
  • , Raymond J. Louie
  • , Robin S. Fletcher
  • , Hannah W. Moore
  • , Anna Childers
  • , Ellyn R. Farrelly
  • , Neena L. Champaigne
  • , Michael J. Lyons
  • , David B. Everman
  • , R. Curtis Rogers
  • , Steven A. Skinner
  • , Alicia Renck
  • , Dena R. Matalon
  • , Shelley K. Dills
  • , Berrin Monteleone
  • Serwet Demirdas, Alexander J.M. Dingemans, Laura Donker Kaat, Sharon M. Kolk, Rolph Pfundt, Patrick Rump, Bekim Sadikovic*, Tjitske Kleefstra, Kameryn M. Butler
*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)

Abstract

Purpose: Witteveen-Kolk syndrome (WITKOS) is a rare, autosomal dominant neurodevelopmental disorder caused by heterozygous loss-of-function alterations in the SIN3A gene. WITKOS has variable expressivity that commonly overlaps with other neurodevelopmental disorders. In this study, we characterized a distinct DNA methylation epigenetic signature (episignature) distinguishing WITKOS from unaffected individuals as well as individuals with other neurodevelopmental disorders with episignatures and described 9 previously unpublished individuals with SIN3A haploinsufficiency. Methods: We studied the phenotypic characteristics and the genome-wide DNA methylation in the peripheral blood samples of 20 individuals with heterozygous alterations in SIN3A. A total of 14 samples were used for the identification of the episignature and building of a predictive diagnostic biomarker, whereas the diagnostic model was used to investigate the methylation pattern of the remaining 6 samples. Results: A predominantly hypomethylated DNA methylation profile specific to WITKOS was identified, and the classifier model was able to diagnose a previously unresolved test case. The episignature was sensitive enough to detect individuals with varying degrees of phenotypic severity carrying SIN3A haploinsufficient variants. Conclusion: We identified a novel, robust episignature in WITKOS due to SIN3A haploinsufficiency. This episignature has the potential to aid identification and diagnosis of individuals with WITKOS.

Original languageEnglish
Pages (from-to)63-75
Number of pages13
JournalGenetics in Medicine
Volume25
Issue number1
Early online date17 Nov 2022
DOIs
Publication statusPublished - Jan 2023

Bibliographical note

Publisher Copyright:
© 2022 American College of Medical Genetics and Genomics

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