Aberrant patterns of H3K4 and H3K27 histone lysine methylation occur across subgroups in medulloblastoma
Recent sequencing efforts have described the mutational landscape of the pediatric brain tumor medulloblastoma. Although MLL2 is among the most frequent somatic single nucleotide variants (SNV), the clinical and biological significance of these mutations remains uncharacterized. Through targeted re-...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2013
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| In: |
Acta neuropathologica
Year: 2013, Jahrgang: 125, Heft: 3, Pages: 373-384 |
| ISSN: | 1432-0533 |
| DOI: | 10.1007/s00401-012-1070-9 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/s00401-012-1070-9
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| Verfasserangaben: | Adrian M. Dubuc, Marc Remke, Andrey Korshunov, Paul A. Northcott, Shing H. Zhan, Maria Mendez-Lago, Marcel Kool, David T.W. Jones, Alexander Unterberger, A. Sorana Morrissy, David Shih, John Peacock, Vijay Ramaswamy, Adi Rolider, Xin Wang, Hendrik Witt, Thomas Hielscher, Cynthia Hawkins, Rajeev Vibhakar, Sidney Croul, James T. Rutka, William A. Weiss, Steven J.M. Jones, Charles G. Eberhart, Marco A. Marra, Stefan M. Pfister, Michael D. Taylor |
MARC
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| 245 | 1 | 0 | |a Aberrant patterns of H3K4 and H3K27 histone lysine methylation occur across subgroups in medulloblastoma |c Adrian M. Dubuc, Marc Remke, Andrey Korshunov, Paul A. Northcott, Shing H. Zhan, Maria Mendez-Lago, Marcel Kool, David T.W. Jones, Alexander Unterberger, A. Sorana Morrissy, David Shih, John Peacock, Vijay Ramaswamy, Adi Rolider, Xin Wang, Hendrik Witt, Thomas Hielscher, Cynthia Hawkins, Rajeev Vibhakar, Sidney Croul, James T. Rutka, William A. Weiss, Steven J.M. Jones, Charles G. Eberhart, Marco A. Marra, Stefan M. Pfister, Michael D. Taylor |
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| 500 | |a Published online: 25 November 2012 | ||
| 500 | |a Gesehen am 05.01.2021 | ||
| 520 | |a Recent sequencing efforts have described the mutational landscape of the pediatric brain tumor medulloblastoma. Although MLL2 is among the most frequent somatic single nucleotide variants (SNV), the clinical and biological significance of these mutations remains uncharacterized. Through targeted re-sequencing, we identified mutations of MLL2 in 8 % (14/175) of MBs, the majority of which were loss of function. Notably, we also report mutations affecting the MLL2-binding partner KDM6A, in 4 % (7/175) of tumors. While MLL2 mutations were independent of age, gender, histological subtype, M-stage or molecular subgroup, KDM6A mutations were most commonly identified in Group 4 MBs, and were mutually exclusive with MLL2 mutations. Immunohistochemical staining for H3K4me3 and H3K27me3, the chromatin effectors of MLL2 and KDM6A activity, respectively, demonstrated alterations of the histone code in 24 % (53/220) of MBs across all subgroups. Correlating these MLL2- and KDM6A-driven histone marks with prognosis, we identified populations of MB with improved (K4+/K27−) and dismal (K4−/K27−) outcomes, observed primarily within Group 3 and 4 MBs. Group 3 and 4 MBs demonstrate somatic copy number aberrations, and transcriptional profiles that converge on modifiers of H3K27-methylation (EZH2, KDM6A, KDM6B), leading to silencing of PRC2-target genes. As PRC2-mediated aberrant methylation of H3K27 has recently been targeted for therapy in other diseases, it represents an actionable target for a substantial percentage of medulloblastoma patients with aggressive forms of the disease. | ||
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