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Published on: March 7, 2017
Radio-Resistance and DNA Repair in Pediatric Diffuse Midline Gliomas
Henriette Pedersen1, Kjeld Schmiegelow2,3, Petra Hamerlik1,4
1Brain Tumor Biology, Danish Cancer Society Research Center, Strandboulevarden 49, DK-2100 Copenhagen, Denmark.
Abstract:
Malignant gliomas (MG) are among the most prevalent and lethal primary intrinsic brain tumors. Although radiotherapy (RT) is the most effective nonsurgical therapy, recurrence is universal. Dysregulated DNA damage response pathway (DDR) signaling, rampant genomic instability, and radio-resistance are among the hallmarks of MGs, with current therapies only offering palliation. A subgroup of pediatric high-grade gliomas (pHGG) is characterized by H3K27M mutation, which drives global loss of di- and trimethylation of histone H3K27. Here, we review the most recent literature and discuss the key studies dissecting the molecular biology of H3K27M-mutated gliomas in children. We speculate that the aberrant activation and/or deactivation of some of the key components of DDR may be synthetically lethal to H3K27M mutation and thus can open novel avenues for effective therapeutic interventions for patients suffering from this deadly disease.
Insights
Malignant gliomas (MGs) are deadly brain tumors. Targeting DNA damage response pathways may offer new treatments for H3K27M-mutated pediatric high-grade gliomas (pHGG) by exploiting synthetic lethality.
Area of Science:
- Neuro-oncology
- Cancer Genomics
- Molecular Biology
Background:
- Malignant gliomas (MGs) are aggressive primary brain tumors with poor prognoses.
- Radiotherapy (RT) is a primary treatment, but tumor recurrence is common.
- MGs exhibit hallmarks like DNA damage response (DDR) pathway dysregulation and genomic instability.
Purpose of the Study:
- To review recent literature on H3K27M-mutated pediatric high-grade gliomas (pHGG).
- To explore the molecular biology of these specific gliomas.
- To identify potential therapeutic vulnerabilities.
Main Methods:
- Literature review of key studies on H3K27M-mutated gliomas.
- Analysis of molecular mechanisms, including DDR signaling.
- Discussion of potential synthetic lethal interactions.
Main Results:
- H3K27M mutation in pediatric gliomas leads to global loss of histone H3K27 methylation.
- Dysregulation of DDR pathways is a characteristic feature.
- Aberrant DDR signaling may present a synthetic lethal vulnerability.
Conclusions:
- H3K27M-mutated gliomas represent a distinct molecular subtype of pediatric brain tumors.
- Targeting specific DDR pathway components could offer novel therapeutic strategies.
- Exploiting synthetic lethality presents a promising avenue for treating these lethal pediatric brain tumors.
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