Abstract
Epigenetic modifications at the DNA level play a central role in establishing the chromatin state and thereby influencing biological function. Several disorders arise from aberrant epigenetic patterns on DNA, cancer being widely explored as an epigenetic disorder. In fact several cancers are associated with a hypermethylator phenotype, which essentially functions as a ‘driver’ of tumorigenesis. Aberrant DNA methylation patterns arise from disrupting the ‘writers’ or ‘erasers’ of the DNA methylation pathway, coordinately functioning to regulate DNA epigenetic marks. Cancer associated deregulatory mechanisms targeting functional disruption of the molecular components of the DNA methylation pathway, and their contribution to cancer initiation and progression are being increasingly appreciated. Understanding these mechanisms of deregulation is central to identifying new targets for therapeutic intervention, in both cancer prevention and treatment.
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Abbreviations
- AML:
-
Acute Myeloid Leukemia
- CGI:
-
CpG island
- CIMP:
-
CpG hypermethylator phenotype
- DNMT:
-
DNA methyltransferase
- EBF1:
-
Early B-Cell Factor 1
- EMT:
-
Epithelial to mesenchymal transition
- FH:
-
Fumarate hydratase (fumarase)
- G-CIMP:
-
Glioma specific CIMP
- GSC:
-
Glioblastoma Stem Cells
- HIF:
-
Hypoxia inducible factor
- HPC:
-
Hematopoietic presursor cells
- HRE:
-
Hypoxia response element
- HSC:
-
Hematopoietic stem cells
- IDAX:
-
Inhibition of the Dvl and Axin Complex
- IDH:
-
Isocitrate dehydrogenase
- MBD:
-
Methyl binding domain
- mCG:
-
CpG methylation
- mCH:
-
Non-CpG methylation
- MDS:
-
Myelodysplastic Syndromes
- MLL:
-
Mixed-lineage leukemia
- MPN:
-
Myeloproliferative Neoplasm
- MTase:
-
Methyltransferase
- PCNA:
-
Proliferating cell nuclear antigen
- SDH:
-
Succinate dehydrogenase
- TDG:
-
Thymine-DNA glycosylase
- TET:
-
Ten-eleven translocation
- UHRF:
-
Ubiquitin-Like with PHD and Ring Finger Domains
- α-KG:
-
Alpha-ketoglutarate
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Glossary
- CpG site
-
Linear sequence of DNA where a cytosine is followed by guanine in the 5' to 3' direction.
- CpG methylation (mCG)
-
Cytosine within a CpG site, methylated by the DNMTs at the C5 position, represented as mCG.
- Non CpG methylation (mCH)
-
Methylation occurring outside of CpG sites, where H could be adenine, cytosine or thymine.
- CpG Islands (CGI)
-
Short interspersed sequence of DNA, around 200 base-pairs long, with high CpG fequency, and GC content greater than 50%.
- CpG shores and shelves
-
2 kb on either side of CpG islands are termed CpG shores, and 2 kb on either side of the CGI shores are termed CGI shelves.
- CpG Canyons
-
Regions of low methylation, distinct from CGIs, and frequently associated with transcription factor binding sites.
- Epimutations
-
Non-genetic, heritable, aberrant lesions in the expression of a gene, arising from epigenetic DNA modifications or other epigenetic modifications on local chromatin.
- CpG hypermethylator phenotype (CIMP)
-
Hypermethylated CpG islands forming a diagnostic/prognostic tumor specific DNA methylation signature.
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Thompson, J.J., Robertson, K.D. (2017). Misregulation of DNA Methylation Regulators in Cancer. In: Kaneda, A., Tsukada, Yi. (eds) DNA and Histone Methylation as Cancer Targets. Cancer Drug Discovery and Development. Humana Press, Cham. https://doi.org/10.1007/978-3-319-59786-7_5
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