Clear cell meningiomas are defined by a highly distinct DNA methylation profile and mutations in SMARCE1

Philipp Sievers, Martin Sill, Christina Blume, Arnault Tauziede-Espariat, Daniel Schrimpf, Damian Stichel, David E. Reuss, Helin Dogan, Christian Hartmann, Christian Mawrin, Martin Hasselblatt, Walter Stummer, Uta Schick, Jürgen Hench, Stephan Frank, Ralf Ketter, Leonille Schweizer, Jens Schittenhelm, Stéphanie Puget, Sebastian BrandnerZane Jaunmuktane, Benno Küsters, Zied Abdullaev, Melike Pekmezci, Matija Snuderl, Miriam Ratliff, Christel Herold-Mende, Andreas Unterberg, Kenneth Aldape, David W. Ellison, Pieter Wesseling, Guido Reifenberger, Wolfgang Wick, Arie Perry, Pascale Varlet, Stefan M. Pfister, David T.W. Jones, Andreas von Deimling, Felix Sahm*, The German Consortium “Aggressive Meningiomas”

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Clear cell meningioma represents an uncommon variant of meningioma that typically affects children and young adults. Although an enrichment of loss-of-function mutations in the SMARCE1 gene has been reported for this subtype, comprehensive molecular investigations are lacking. Here we describe a molecularly distinct subset of tumors (n = 31), initially identified through genome-wide DNA methylation screening among a cohort of 3093 meningiomas, of which most were diagnosed histologically as clear cell meningioma. This cohort was further supplemented by an additional 11 histologically diagnosed clear cell meningiomas for analysis (n = 42). Targeted DNA sequencing revealed SMARCE1 mutations in 33/34 analyzed samples, accompanied by a nuclear loss of expression determined via immunohistochemistry and a decreased SMARCE1 transcript expression in the tumor cells. Analysis of time to progression or recurrence of patients within the clear cell meningioma group (n = 14) in comparison to those with meningioma WHO grade 2 (n = 220) revealed a similar outcome and support the assignment of WHO grade 2 to these tumors. Our findings indicate the existence of a highly distinct epigenetic signature of clear cell meningiomas, separate from all other variants of meningiomas, with recurrent mutations in the SMARCE1 gene. This suggests that these tumors may arise from a different precursor cell population than the broad spectrum of the other meningioma subtypes.

Original languageEnglish
Pages (from-to)281-290
Number of pages10
JournalActa Neuropathologica
Volume141
Issue number2
DOIs
Publication statusPublished - Feb 2021

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