Pilocytic astrocytoma (PA) is the most common glioma in pediatric patients and occurs in different locations. Chromosomal alterations are mostly located at chromosome 7q34 comprising the BRAF oncogene with consequent activation of the mitogen-activated protein kinase pathway. Although genetic and epigenetic alterations characterizing PA from different localizations have been reported, the role of epigenetic alterations in PA development is still not clear. The aim of this study was to investigate whether distinctive methylation patterns may define biologically relevant groups of PAs. Integrated DNA methylation analysis was performed on 20 PAs and 4 normal brain samples by Illumina Infinium HumanMethylation27 BeadChips. We identified distinct methylation profiles characterizing PAs from different locations (infratentorial vs supratentorial) and tumors with onset before and after 3 years of age. These results suggest that PA may be related to the specific brain site where the tumor arises from region-specific cells of origin. We identified and validated in silico the methylation alterations of some CpG islands. Furthermore, we evaluated the expression levels of selected differentially methylated genes and identified two biomarkers, one, IRX2, related to the tumor localization and the other, TOX2, as tumoral biomarker.

Antonelli, M., Fadda, A., Loi, E., Moi, L., Zavattari, C., Sulas, P., et al. (2018). Integrated DNA methylation analysis identifies topographical and tumoral biomarkers in pilocytic astrocytomas. ONCOTARGET, 9(17), 13807-13821 [10.18632/oncotarget.24480].

Integrated DNA methylation analysis identifies topographical and tumoral biomarkers in pilocytic astrocytomas

Cameli, Cinzia;Bacchelli, Elena;ZAVATTARI, PATRIZIA
2018

Abstract

Pilocytic astrocytoma (PA) is the most common glioma in pediatric patients and occurs in different locations. Chromosomal alterations are mostly located at chromosome 7q34 comprising the BRAF oncogene with consequent activation of the mitogen-activated protein kinase pathway. Although genetic and epigenetic alterations characterizing PA from different localizations have been reported, the role of epigenetic alterations in PA development is still not clear. The aim of this study was to investigate whether distinctive methylation patterns may define biologically relevant groups of PAs. Integrated DNA methylation analysis was performed on 20 PAs and 4 normal brain samples by Illumina Infinium HumanMethylation27 BeadChips. We identified distinct methylation profiles characterizing PAs from different locations (infratentorial vs supratentorial) and tumors with onset before and after 3 years of age. These results suggest that PA may be related to the specific brain site where the tumor arises from region-specific cells of origin. We identified and validated in silico the methylation alterations of some CpG islands. Furthermore, we evaluated the expression levels of selected differentially methylated genes and identified two biomarkers, one, IRX2, related to the tumor localization and the other, TOX2, as tumoral biomarker.
2018
Antonelli, M., Fadda, A., Loi, E., Moi, L., Zavattari, C., Sulas, P., et al. (2018). Integrated DNA methylation analysis identifies topographical and tumoral biomarkers in pilocytic astrocytomas. ONCOTARGET, 9(17), 13807-13821 [10.18632/oncotarget.24480].
Antonelli, Manila; Fadda, Antonio; Loi, Eleonora; Moi, Loredana; Zavattari, Cesare; Sulas, Pia; Gentilini, Davide; Cameli, Cinzia; Bacchelli, Elena; B...espandi
File in questo prodotto:
File Dimensione Formato  
24480-342780-4-PB.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 3.33 MB
Formato Adobe PDF
3.33 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/655815
Citazioni
  • ???jsp.display-item.citation.pmc??? 11
  • Scopus 17
  • ???jsp.display-item.citation.isi??? 0
social impact