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Recurrent genetic alterations in epigenetically defined pineoblastoma subtypes.

Tobias Goschzik1, Mathias Yuan2, Elke Pfaff3,4,5,6

  • 1Department of Neuropathology, University of Bonn Medical Center, Venusberg-Campus 1, 53127, Bonn, Germany.

Acta Neuropathologica Communications
|November 26, 2025
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Summary

This study details genetic underpinnings of four pineoblastoma (PB) subtypes, finding distinct genetic events characterize each. Frequent OTX2 gains suggest a role in PB pathogenesis across subtypes.

Keywords:
DICER1DROSHAEpigenetic subtypesPPTIDPineoblastoma

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Area of Science:

  • Oncology
  • Genetics
  • Epigenetics

Background:

  • Previous research identified four distinct epigenetic consensus pineoblastoma (PB) subtypes.
  • Understanding the genetic basis of these subtypes is crucial for targeted therapies.

Purpose of the Study:

  • To confirm and extend the genetic underpinnings of the four established PB subtypes.
  • To investigate the role of specific genetic alterations in PB pathogenesis.

Main Methods:

  • High-resolution genome-wide molecular inversion probe analysis and methylation profiling of 83 PBs.
  • Next-generation DNA panel sequencing for mutation screening and NanoString for mRNA expression analysis.
  • Analysis of cytogenetic aberrations, microRNA-processing gene alterations, and OTX2 copy number variations.

Main Results:

  • PB-miRNA subtypes showed characteristic microRNA-processing gene alterations, including DICER1 mutations and DROSHA locus deletions/mutations.
  • Frequent cytogenetic aberrations in PB-miRNA cases included chromosome 7 gains and chromosome 14 losses, associated with DICER1 mutations.
  • OTX2 gain was the most frequent alteration across all PB subtypes, suggesting a general role in pathogenesis. PB-MYC/FOXR2 and PB-RB1 subtypes in infants indicated a worse outcome.

Conclusions:

  • Epigenetically defined PB subtypes are characterized by distinct genetic events.
  • Frequent OTX2 gains indicate its involvement in PB pathogenesis, irrespective of subtype.
  • While PB-miRNA subtypes did not show survival differences, specific subtypes (PB-MYC/FOXR2, PB-RB1) in infants are associated with poorer prognosis.