Abstract
A brain tumor is an abnormal growth of heterogeneous cells around the central nervous system and spinal cord. It is seen in different types and frequencies in children and adults. Today, surgery, radiotherapy, and chemotherapy are common treatment approaches. Comprehensive molecular profiling has dramatically changed the diagnostic neuropathology of brain tumors. Diffuse gliomas, the most common and fatal brain tumor variants, are now classified by highly repetitive biomarkers rather than histomorphological features. Many critical molecular changes that drive glioma classification involve fundamental epigenetic dysregulation, an area not previously thought to play important roles in glioma pathogenesis. Considering tumor heterogeneity in the classification of brain tumors, molecular markers provide more accurate results in diagnosis, prognosis, and selection of treatment approaches. Recently, epigenetic changes have received increasing attention as they aid in understanding the mechanism of chromatin-mediated disease. Epigenetic modification alters the chromatin structure, which affects the docking site of many drugs that cause chemoresistance in cancer therapy. This chapter will review the main epigenetic changes underlying malignant gliomas and their possible mechanisms of action, based on the WHO 2021 classification.
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Abbreviations
- 5caC:
-
5-Carboxylcytosine
- 5fC:
-
5-Formylcytosine
- APNG:
-
Alkylpurine-DNA-N-glycosylase
- ASIR:
-
Age-standardized incidence rate
- ASMR:
-
Age-standardized mortality rate
- ATPase:
-
Adenosine triphosphatase
- CGI:
-
CpG islands
- CNS:
-
Central nervous system
- CTCF:
-
CCCTC-binding factor
- DIPGs :
-
Diffuse intrinsic pontine gliomas
- DNMTs:
-
DNA methyltransferases
- G-CIMP:
-
Glioma CpG island methylator phenotype
- HATs:
-
Histone acetyltransferases
- HDACi:
-
HDAC inhibitors
- HDACs:
-
Histone deacetylases
- mRNAs:
-
Messenger RNAs
- NADP(+):
-
Nicotinamide adenine dinucleotide phosphate
- ncRNAs:
-
Noncoding RNAs
- TCGA :
-
The Cancer Genome Atlas
- TMZ:
-
Temozolomide
- α-KG:
-
α-Ketoglutarate
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The authors declare that they have no competing interests. Although some figures of the chapter are similar to the figures in the literature in the schematic description of the molecular mechanisms, all the figures in this section were produced and drawn by the authors themselves.
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Artan, S., Arslantas, A. (2023). The Epigenetics of Brain Tumors: Fundamental Aspects of Epigenetics in Glioma. In: Kalkan, R. (eds) Cancer Epigenetics. Epigenetics and Human Health, vol 11. Springer, Cham. https://doi.org/10.1007/978-3-031-42365-9_7
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