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The Role of DNA Methylation and DNA Methyltransferases in Cancer

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DNA Methyltransferases - Role and Function

Abstract

The malignant transformation of normal cells is driven by both genetic and epigenetic changes. With the advent of next-generation sequencing and large-scale international consortia, it is now possible to profile the genomes and epigenomes of thousands of primary tumors from nearly every cancer type. These studies clearly demonstrate that the dynamic regulation of DNA methylation is a critical epigenetic mechanism of cancer initiation, maintenance, and progression. Proper control of DNA methylation is not only crucial for regulating gene transcription and tissue-specific cellular functions, but its broader consequences include maintaining the integrity of the genome and modulating the immune response. Here, we describe the aberrant DNA methylation changes in human cancers and how they contribute to the disease phenotypes. Aside from CpG island promoter DNA hypermethylation-based gene silencing, human cancers also display gene body DNA hypomethylation that is also associated with downregulated gene expression. In addition, the implementation of whole genome bisulfite sequencing (WGBS) has unveiled DNA hypomethylation of large blocks of the genome, known as partially methylated domains (PMDs), as well as cancer-specific DNA methylation aberrancies at enhancers and super-enhancers. Integrating WGBS and DNA methylation array data with mutation, copy number, and gene expression data has allowed for the identification of novel tumor suppressor genes and candidate driver genes of the disease state. Finally, we highlight potential clinical implications of these changes in the context of prognostic and diagnostic biomarkers, as well as therapeutic targets. Mounting evidence shows that DNA methylation data are effective and highly-sensitive disease classifiers, not only from analyses of the primary tumor but also from tumor-derived, cell free DNA (cfDNA) in blood of cancer patients. These findings highlight the power of DNA methylation aberrancies in providing efficacious biomarkers for clinical utility in improving patient diagnostics and their reversal using DNA methylation inhibitors in cancer treatment may be key in surveillance, treatment, and quality of life for cancer patients.

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Abbreviations

5-Aza-CR:

5-azacytidine

5-Aza-CdR :

5-Aza-2′deoxycytidine

5caC:

5-carboxylcytosine

5fC :

5-formylcytosine

5hmC :

5-hydroxymethylcytosine

5mC:

The carbon-5 atom of cytosine

AML:

Acute myeloid leukemia

ccRCC:

Clear cell renal cell carcinoma

cfDNA:

Cell free DNA

CGIs:

CpG islands

CIMP:

CpG island methylator phenotype

CMS:

Consensus molecular subgroups

CpG:

Cytosine-guanine dinucleotide

DNMT:

DNA methyltransferases

DNMTi:

DNA methyltransferase inhibitor

dsRNA:

Double-stranded RNA

ENCODE:

Encyclopedia of DNA Elements

EOC:

Epithelial ovarian carcinoma

ERV:

Endogenous retrovirus

FFPE:

Paraffin embedded

GBM:

Glioblastoma multiforme

H3K27M:

Histone H3 lysine 27 to methionine

H3K27me3:

Histone H3 lysine 27 trimethylation

Hypermutation:

High global somatic mutation rates

ICR:

Imprinting control region

IGF2:

Insulin-like growth factor 2

LADs:

Laminin-associated domains

LUAD:

Lung adenocarcinomas

MAVS:

Mitochondrial antiviral signaling

MDS:

Myelodysplastic syndrome

MGMT:

O-6-Methylguanine-DNA methyltransferase

MSI-H:

High microsatellite instability

MSS:

Microsatellite stable

NSCLC:

Non-small cell lung cancer

pHGGs:

Pediatric high-grade gliomas

TCGA:

The Cancer Genome Atlas

TDG:

Thymine DNA glycosylase

TET:

Ten-eleven translocation

TMZ:

Temozolomide

TSGs:

Tumor suppressor genes

TSS:

Transcription Start Site

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Acknowledgments

The work in the Liang laboratory has been supported in part by the generous contribution of George and Vicky Joseph.

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Correspondence to Gangning Liang .

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© 2022 The Author(s), under exclusive license to Springer Nature Switzerland AG

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Weisenberger, D.J., Lakshminarasimhan, R., Liang, G. (2022). The Role of DNA Methylation and DNA Methyltransferases in Cancer. In: Jeltsch, A., Jurkowska, R.Z. (eds) DNA Methyltransferases - Role and Function. Advances in Experimental Medicine and Biology, vol 1389. Springer, Cham. https://doi.org/10.1007/978-3-031-11454-0_13

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