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Goossens R, Tihaya MS, van den Heuvel A, et al. A proteomics study identifying interactors of the FSHD2 gene product SMCHD1 reveals RUVBL1-dependent DUX4 repression. Sci Rep. 2021;11(1):23642doi: 10.1038/s41598-021-03030-3.
Goossens, R., Tihaya, M. S., van den Heuvel, A., Tabot-Ndip, K., Willemsen, I. M., Tapscott, S. J., González-Prieto, R., Chang, J. G., Vertegaal, A. C. O., Balog, J., & van der Maarel, S. M. (2021). A proteomics study identifying interactors of the FSHD2 gene product SMCHD1 reveals RUVBL1-dependent DUX4 repression. Scientific reports, 11(1), 23642. https://doi.org/10.1038/s41598-021-03030-3
Goossens, Remko, et al. "A proteomics study identifying interactors of the FSHD2 gene product SMCHD1 reveals RUVBL1-dependent DUX4 repression." Scientific reports vol. 11,1 (2021): 23642. doi: https://doi.org/10.1038/s41598-021-03030-3
Goossens R, Tihaya MS, van den Heuvel A, Tabot-Ndip K, Willemsen IM, Tapscott SJ, González-Prieto R, Chang JG, Vertegaal ACO, Balog J, van der Maarel SM. A proteomics study identifying interactors of the FSHD2 gene product SMCHD1 reveals RUVBL1-dependent DUX4 repression. Sci Rep. 2021 Dec 08;11(1):23642. doi: 10.1038/s41598-021-03030-3. PMID: 34880314; PMCID: PMC8654949.
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Sci Rep. 2021 Dec 08;11(1):23642. doi: 10.1038/s41598-021-03030-3.

A proteomics study identifying interactors of the FSHD2 gene product SMCHD1 reveals RUVBL1-dependent DUX4 repression.

Scientific reports

Remko Goossens, Mara S Tihaya, Anita van den Heuvel, Klorane Tabot-Ndip, Iris M Willemsen, Stephen J Tapscott, Román González-Prieto, Jer-Gung Chang, Alfred C O Vertegaal, Judit Balog, Silvère M van der Maarel

Affiliations

  1. Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands.
  2. Human Biology Division, Fred Hutchinson Cancer Research Center, Seattle, USA.
  3. Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, The Netherlands.
  4. Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands. [email protected].
  5. Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands. [email protected].

PMID: 34880314 PMCID: PMC8654949 DOI: 10.1038/s41598-021-03030-3

Abstract

Structural Maintenance of Chromosomes Hinge Domain Containing 1 (SMCHD1) is a chromatin repressor, which is mutated in > 95% of Facioscapulohumeral dystrophy (FSHD) type 2 cases. In FSHD2, SMCHD1 mutations ultimately result in the presence of the cleavage stage transcription factor DUX4 in muscle cells due to a failure in epigenetic repression of the D4Z4 macrosatellite repeat on chromosome 4q, which contains the DUX4 locus. While binding of SMCHD1 to D4Z4 and its necessity to maintain a repressive D4Z4 chromatin structure in somatic cells are well documented, it is unclear how SMCHD1 is recruited to D4Z4, and how it exerts its repressive properties on chromatin. Here, we employ a quantitative proteomics approach to identify and characterize novel SMCHD1 interacting proteins, and assess their functionality in D4Z4 repression. We identify 28 robust SMCHD1 nuclear interactors, of which 12 are present in D4Z4 chromatin of myocytes. We demonstrate that loss of one of these SMCHD1 interacting proteins, RuvB-like 1 (RUVBL1), further derepresses DUX4 in FSHD myocytes. We also confirm the interaction of SMCHD1 with EZH inhibitory protein (EZHIP), a protein which prevents global H3K27me3 deposition by the Polycomb repressive complex PRC2, providing novel insights into the potential function of SMCHD1 in the repression of DUX4 in the early stages of embryogenesis. The SMCHD1 interactome outlined herein can thus provide further direction into research on the potential function of SMCHD1 at genomic loci where SMCHD1 is known to act, such as D4Z4 repeats, the inactive X chromosome, autosomal gene clusters, imprinted loci and telomeres.

© 2021. The Author(s).

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