Molecular Characterization of Central Nervous System Astroblastomas

Astroblastomas are rare glial neoplasms of the central nervous system with uncertain histogenesis and variable clinical behaviour. Recent advances in genomics and epigenomics have revealed that tumours exhibiting astroblastoma-like morphology are molecularly heterogeneous, encompassing distinct entities defined by DNA methylation profiles, gene fusions and mutational landscapes. A prominent subgroup is characterised by rearrangements of the MN1 gene, frequently fused with BEND2 or novel partners, and shows a striking female predominance. Other tumours harbour alterations in the MAPK pathway, including BRAFV600E mutations, or fusions involving EWSR1-PATZ1 and MN1-GTSE1. Integrative analyses have linked certain subtypes to developmental lineages of radial glia, indicating that these lesions may arise from neural progenitor cells at specific gestational stages. Molecular stratification has proven critical for prognostication, as MN1-altered tumours often display a more favourable clinical course compared with BRAFV600E-driven or other high-grade counterparts. These insights have refined diagnostic criteria, informed surgical and adjuvant treatment decisions, and uncovered potential targets for personalised therapy.

Research from Nature Portfolio

Recent studies have leveraged comprehensive genetic and epigenetic profiling to map the cellular origins and evolutionary trajectories of astroblastoma subtypes. Integrative analysis of genome-wide methylation, transcriptome and fusion detection has demonstrated that MN1-rearranged tumours trace back to radial glia stem cell lineages, with distinct imprinting and X-inactivation escape mechanisms contributing to female bias. In parallel, phylogenetic reconstruction of a decade-long recurrent case with MN1:BEND2 fusion has elucidated patterns of tumour dissemination and convergent evolution, identifying secondary alterations in NF-κB signalling as potential therapeutic vulnerabilities. Collectively, these investigations have established a framework for linking histopathology with molecular taxonomy, emphasising the role of epigenetic context in tumour behaviour and response to treatment.

Molecular Characterization of Central Nervous System Astroblastomas publication trend

The graph below shows the total number of articles in molecular characterization of central nervous system astroblastomas across all publications each year (not limited to Nature Index journals).

Technical terms

Astroblastoma: A rare primary brain tumour with astroblastic pseudorosettes and variable molecular alterations.

MN1 rearrangement: Genomic fusion or translocation involving the meningioma 1 gene, defining a subgroup with distinct epigenetic profile.

DNA methylation profiling: Genome-wide assessment of cytosine methylation patterns used to classify CNS tumours by epigenetic signature.

Gene fusion: Structural variant joining parts of two genes, often creating oncogenic chimeric transcripts.

Radial glia: Neural progenitor cells in the developing brain that give rise to neurons and glia, implicated as the cell of origin in some subtypes.

Epigenetic profile: The pattern of heritable chromatin modifications that regulates gene expression without altering DNA sequence.

References

1. Astroblastomas exhibit radial glia stem cell lineages and differential expression of imprinted and X-inactivation escape genes. Nature Communications (2022).
2. Genomic analysis demonstrates that histologically-defined astroblastomas are molecularly heterogeneous and that tumors with MN1 rearrangement exhibit the most favorable prognosis. Acta Neuropathologica Communications (2019).
3. The ten-year evolutionary trajectory of a highly recurrent paediatric high grade neuroepithelial tumour with MN1:BEND2 fusion. Scientific Reports (2018).
4. A rare case of paediatric astroblastoma with concomitant MN1‐GTSE1 and EWSR1‐PATZ1 gene fusions altering management. Neuropathology and Applied Neurobiology (2021).
5. Early ependymal tumor with MN1-BEND2 fusion: a mostly cerebral tumor of female children with a good prognosis that is distinct from classical astroblastoma. Journal of Neuro-Oncology (2023).
6. Heterogeneous clinicopathological findings and patient-reported outcomes in adults with MN1-altered CNS tumors: A case report and systematic literature review. Frontiers in Oncology (2023).