Oncogenomics

Last updated

Oncogenomics is a sub-field of genomics that characterizes cancer-associated genes. It focuses on genomic, epigenomic and transcript alterations in cancer.

Contents

Cancer is a genetic disease caused by accumulation of DNA mutations and epigenetic alterations leading to unrestrained cell proliferation and neoplasm formation. The goal of oncogenomics is to identify new oncogenes or tumor suppressor genes that may provide new insights into cancer diagnosis, predicting clinical outcome of cancers and new targets for cancer therapies. The success of targeted cancer therapies such as Gleevec, Herceptin and Avastin raised the hope for oncogenomics to elucidate new targets for cancer treatment. [1]

Overall goals of oncogenomics Overall goals of oncogenomics.JPG
Overall goals of oncogenomics

Besides understanding the underlying genetic mechanisms that initiate or drive cancer progression, oncogenomics targets personalized cancer treatment. Cancer develops due to DNA mutations and epigenetic alterations that accumulate randomly. Identifying and targeting the mutations in an individual patient may lead to increased treatment efficacy.

The completion of the Human Genome Project facilitated the field of oncogenomics and increased the abilities of researchers to find oncogenes. Sequencing technologies and global methylation profiling techniques have been applied to the study of oncogenomics.

History

The genomics era began in the 1990s, with the generation of DNA sequences of many organisms. In the 21st century, the completion of the Human Genome Project enabled the study of functional genomics and examining tumor genomes. Cancer is a main focus.

The epigenomics era largely began more recently, about 2000. [2] [3] One major source of epigenetic change is altered methylation of CpG islands at the promoter region of genes (see DNA methylation in cancer). A number of recently devised methods can assess the DNA methylation status in cancers versus normal tissues. [4] Some methods assess methylation of CpGs located in different classes of loci, including CpG islands, shores, and shelves as well as promoters, gene bodies, and intergenic regions. [5] Cancer is also a major focus of epigenetic studies.

Access to whole cancer genome sequencing is important to cancer (or cancer genome) research because:

Access to methylation profiling is important to cancer research because:

Whole genome sequencing

The first cancer genome was sequenced in 2008. [6] This study sequenced a typical acute myeloid leukaemia (AML) genome and its normal counterpart genome obtained from the same patient. The comparison revealed ten mutated genes. Two were already thought to contribute to tumor progression: an internal tandem duplication of the FLT3 receptor tyrosine kinase gene, which activates kinase signaling and is associated with a poor prognosis and a four base insertion in exon 12 of the NPM1 gene (NPMc). These mutations are found in 25–30% of AML tumors and are thought to contribute to disease progression rather than to cause it directly.

The remaining 8 were new mutations and all were single base changes: Four were in families that are strongly associated with cancer pathogenesis (PTPRT, CDH24, PCLKC and SLC15A1). The other four had no previous association with cancer pathogenesis. They did have potential functions in metabolic pathways that suggested mechanisms by which they could act to promote cancer (KNDC1, GPR124, EB12, GRINC1B)

These genes are involved in pathways known to contribute to cancer pathogenesis, but before this study most would not have been candidates for targeted gene therapy. This analysis validated the approach of whole cancer genome sequencing in identifying somatic mutations and the importance of parallel sequencing of normal and tumor cell genomes. [9]

In 2011, the genome of an exceptional bladder cancer patient whose tumor had been eliminated by the drug everolimus was sequenced, revealing mutations in two genes, TSC1 and NF2 . The mutations disregulated mTOR, the protein inhibited by everolimus, allowing it to reproduce without limit. As a result, in 2015, the Exceptional Responders Initiative was created at the National Cancer Institute. The initiative allows such exceptional patients (who have responded positively for at least six months to a cancer drug that usually fails) to have their genomes sequenced to identify the relevant mutations. Once identified, other patients could be screened for those mutations and then be given the drug. In 2016 To that end, a nationwide cancer drug trial began in 2015, involving up to twenty-four hundred centers. Patients with appropriate mutations are matched with one of more than forty drugs. [10]

In 2014 the Center for Molecular Oncology rolled out the MSK-IMPACT test, a screening tool that looks for mutations in 341 cancer-associated genes. By 2015 more than five thousand patients had been screened. Patients with appropriate mutations are eligible to enroll in clinical trials that provide targeted therapy. [10]

Technologies

Current technologies being used in Oncogenomics. Current technologies being used in Oncogenomics.jpg
Current technologies being used in Oncogenomics.

Genomics technologies include:

Genome sequencing

Transcriptomes

Bioinformatics and functional analysis of oncogenes

Bioinformatics technologies allow the statistical analysis of genomic data. The functional characteristics of oncogenes has yet to be established. Potential functions include their transformational capabilities relating to tumour formation and specific roles at each stage of cancer development.

After the detection of somatic cancer mutations across a cohort of cancer samples, bioinformatic computational analyses can be carried out to identify likely functional and likely driver mutations. There are three main approaches routinely used for this identification: mapping mutations, assessing the effect of mutation of the function of a protein or a regulatory element and finding signs of positive selection across a cohort of tumors. The approaches are not necessarily sequential however, there are important relationships of precedence between elements from the different approaches. Different tools are used at each step. [22]

Operomics

Operomics aims to integrate genomics, transcriptomics and proteomics to understand the molecular mechanisms that underlie the cancer development. [23]

Comparative oncogenomics

Comparative oncogenomics uses cross-species comparisons to identify oncogenes. This research involves studying cancer genomes, transcriptomes and proteomes in model organisms such as mice, identifying potential oncogenes and referring back to human cancer samples to see whether homologues of these oncogenes are important in causing human cancers. [24] Genetic alterations in mouse models are similar to those found in human cancers. These models are generated by methods including retroviral insertion mutagenesis or graft transplantation of cancerous cells.

Source of cancer driver mutations, cancer mutagenesis

Mutations provide the raw material for natural selection in evolution and can be caused by errors of DNA replication, the action of exogenous mutagens or endogenous DNA damage. The machinery of replication and genome maintenance can be damaged by mutations, or altered by physiological conditions and differential levels of expression in cancer (see references in [25] ).

As pointed out by Gao et al., [26] the stability and integrity of the human genome are maintained by the DNA-damage response (DDR) system. Un-repaired DNA damage is a major cause of mutations that drive carcinogenesis. [27] [28] If DNA repair is deficient, DNA damage tends to accumulate. Such excess DNA damage can increase mutational errors during DNA replication due to error-prone translesion synthesis. Excess DNA damage can also increase epigenetic alterations due to errors during DNA repair. [29] [30] Such mutations and epigenetic alterations can give rise to cancer. DDR genes are often repressed in human cancer by epigenetic mechanisms. Such repression may involve DNA methylation of promoter regions or repression of DDR genes by a microRNA. Epigenetic repression of DDR genes occurs more frequently than gene mutation in many types of cancer (see Cancer epigenetics). Thus, epigenetic repression often plays a more important role than mutation in reducing expression of DDR genes. This reduced expression of DDR genes is likely an important driver of carcinogenesis.

Nucleotide sequence context influences mutation probability [31] [32] [33] and analysis of mutational (mutable) DNA motifs can be essential for understanding the mechanisms of mutagenesis in cancer. Such motifs represent the fingerprints of interactions between DNA and mutagens, between DNA and repair/replication/modification enzymes. Examples of motifs are the AID motif WRCY/RGYW (W = A or T, R = purine and Y = pyrimidine) with C to T/G/A mutations, [33] and error-prone DNA pol η attributed AID-related mutations (A to G/C/G) in WA/TW motifs. [34]

Another (agnostic) way to analyze the observed mutational spectra and DNA sequence context of mutations in tumors involves pooling all mutations of different types and contexts from cancer samples into a discrete distribution. If multiple cancer samples are available, their context-dependent mutations can be represented in the form of a nonnegative matrix. This matrix can be further decomposed into components (mutational signatures) which ideally should describe individual mutagenic factors. [35] Several computational methods have been proposed for solving this decomposition problem. The first implementation of Non-negative Matrix Factorization (NMF) method is available in Sanger Institute Mutational Signature Framework in the form of a MATLAB package. [36] On the other hand, if mutations from a single tumor sample are only available, the DeconstructSigs R package [37] and MutaGene server [38] may provide the identification of contributions of different mutational signatures for a single tumor sample. In addition, MutaGene server provides mutagen or cancer-specific mutational background models and signatures that can be applied to calculate expected DNA and protein site mutability to decouple relative contributions of mutagenesis and selection in carcinogenesis.

Synthetic lethality

Synthetic lethality arises when a combination of deficiencies in the expression of two or more genes leads to cell death, whereas a deficiency in only one of these genes does not. The deficiencies can arise through mutations, epigenetic alterations or inhibitors of one of the genes.

The therapeutic potential of synthetic lethality as an efficacious anti-cancer strategy is continually improving. Recently, the applicability of synthetic lethality to targeted cancer therapy has heightened due to the recent work of scientists including Ronald A. DePinho and colleagues, in what is termed 'collateral lethality'. Muller et al. found that passenger genes, with chromosomal proximity to tumor suppressor genes, are collaterally deleted in some cancers. [39] Thus, the identification of collaterally deleted redundant genes carrying out an essential cellular function may be the untapped reservoir for then pursuing a synthetic lethality approach. Collateral lethality therefore holds great potential in identification of novel and selective therapeutic targets in oncology. [40] In 2012, Muller et al. identified that homozygous deletion of redundant-essential glycolytic ENO1 gene in human glioblastoma (GBM) is the consequence of proximity to 1p36 tumor suppressor locus deletions and may hold potential for a synthetic lethality approach to GBM inhibition. [39] ENO1 is one of three homologous genes (ENO2, ENO3) that encodes the mammalian alpha-enolase enzyme. [41] ENO2, which encodes enolase 2, is mostly expressed in neural tissues, leading to the postulation that in ENO1-deleted GBM, ENO2 may be the ideal target as the redundant homologue of ENO1. [42] Muller found that both genetic and pharmacological ENO2 inhibition in GBM cells with homozygous ENO1 deletion elicits a synthetic lethality outcome by selective killing of GBM cells. [39] In 2016, Muller and colleagues discovered antibiotic SF2312 as a highly potent nanomolar-range enolase inhibitor which preferentially inhibits glioma cell proliferation and glycolytic flux in ENO1-deleted cells. [43] SF2312 was shown to be more efficacious than pan-enolase inhibitor PhAH and have more specificity for ENO2 inhibition over ENO1. [43] Subsequent work by the same team showed that the same approach could be applied to pancreatic cancer, whereby homozygously deleted SMAD4 results in the collateral deletion of mitochondrial malic enzyme 2 (ME2), an oxidative decarboxylase essential for redox homeostasis. [44] Dey et al. show that ME2 genomic deletion in pancreatic ductal adenocarcinoma cells results in high endogenous reactive oxygen species, consistent with KRAS-driven pancreatic cancer, and essentially primes ME2-null cells for synthetic lethality by depletion of redundant NAD(P)+-dependent isoform ME3. The effects of ME3 depletion were found to be mediated by inhibition of de novo nucleotide synthesis resulting from AMPK activation and mitochondrial ROS-mediated apoptosis. [45] [44] Meanwhile, Oike et al. demonstrated the generalizability of the concept by targeting redundant essential-genes in process other than metabolism, namely the SMARCA4 and SMARCA2 subunits in the chromatin-remodeling SWI/SNF complex. [46]

Some oncogenes are essential for survival of all cells (not only cancer cells). Thus, drugs that knock out these oncogenes (and thereby kill cancer cells) may also damage normal cells, inducing significant illness. However, other genes may be essential to cancer cells but not to healthy cells.

Treatments based on the principle of synthetic lethality have prolonged the survival of cancer patients, and show promise for future advances in reversal of carcinogenesis. A major type of synthetic lethality operates on the DNA repair defect that often initiates a cancer, and is still present in the tumor cells. Some examples are given here.

BRCA1 or BRCA2 expression is deficient in a majority of high-grade breast and ovarian cancers, usually due to epigenetic methylation of its promoter or epigenetic repression by an over-expressed microRNA (see articles BRCA1 and BRCA2). BRCA1 and BRCA2 are important components of the major pathway for homologous recombinational repair of double-strand breaks. If one or the other is deficient, it increases the risk of cancer, especially breast or ovarian cancer. A back-up DNA repair pathway, for some of the damages usually repaired by BRCA1 and BRCA2, depends on PARP1. Thus, many ovarian cancers respond to an FDA-approved treatment with a PARP inhibitor, causing synthetic lethality to cancer cells deficient in BRCA1 or BRCA2. This treatment is also being evaluated for breast cancer and numerous other cancers in Phase III clinical trials in 2016. [47]

There are two pathways for homologous recombinational repair of double-strand breaks. The major pathway depends on BRCA1, PALB2 and BRCA2 while an alternative pathway depends on RAD52. [48] Pre-clinical studies, involving epigenetically reduced or mutated BRCA-deficient cells (in culture or injected into mice), show that inhibition of RAD52 is synthetically lethal with BRCA-deficiency. [49]

Mutations in genes employed in DNA mismatch repair (MMR) cause a high mutation rate. [50] In tumors, such frequent subsequent mutations often generate "non-self" immunogenic antigens. A human Phase II clinical trial, with 41 patients, evaluated one synthetic lethal approach for tumors with or without MMR defects. [51] The product of gene PD-1 ordinarily represses cytotoxic immune responses. Inhibition of this gene allows a greater immune response. When cancer patients with a defect in MMR in their tumors were exposed to an inhibitor of PD-1, 67–78% of patients experienced immune-related progression-free survival. In contrast, for patients without defective MMR, addition of PD-1 inhibitor generated only 11% of patients with immune-related progression-free survival. Thus inhibition of PD-1 is primarily synthetically lethal with MMR defects.

ARID1A, a chromatin modifier, is required for non-homologous end joining, a major pathway that repairs double-strand breaks in DNA, [52] and also has transcription regulatory roles. [53] ARID1A mutations are one of the 12 most common carcinogenic mutations. [54] Mutation or epigenetically decreased expression [55] of ARID1A has been found in 17 types of cancer. [56] Pre-clinical studies in cells and in mice show that synthetic lethality for ARID1A deficiency occurs by either inhibition of the methyltransferase activity of EZH2, [57] [58] or with addition of the kinase inhibitor dasatinib. [59]

Another approach is to individually knock out each gene in a genome and observe the effect on normal and cancerous cells. [60] [61] If the knockout of an otherwise nonessential gene has little or no effect on healthy cells, but is lethal to cancerous cells containing a mutated oncogene, then the system-wide suppression of the suppressed gene can destroy cancerous cells while leaving healthy ones relatively undamaged. The technique was used to identify PARP-1 inhibitors to treat BRCA1/BRCA2-associated cancers. [62] [63] In this case, the combined presence of PARP-1 inhibition and of the cancer-associated mutations in BRCA genes is lethal only to the cancerous cells.

Databases for cancer research

The Cancer Genome Project is an initiative to map out all somatic mutations in cancer. The project systematically sequences the exons and flanking splice junctions of the genomes of primary tumors and cancerous cell lines. COSMIC software displays the data generated from these experiments. As of February 2008, the CGP had identified 4,746 genes and 2,985 mutations in 1,848 tumours.

The Cancer Genome Anatomy Project includes information of research on cancer genomes, transcriptomes and proteomes.

Progenetix is an oncogenomic reference database, presenting cytogenetic and molecular-cytogenetic tumor data.

Oncomine has compiled data from cancer transcriptome profiles.

The integrative oncogenomics database IntOGen and the Gitools datasets integrate multidimensional human oncogenomic data classified by tumor type. The first version of IntOGen focused on the role of deregulated gene expression and CNV in cancer. [64] A later version emphasized mutational cancer driver genes across 28 tumor types,. [65] [66] All releases of IntOGen data are made available at the IntOGen database.

The International Cancer Genome Consortium is the biggest project to collect human cancer genome data. The data is accessible through the ICGC website. The BioExpress® Oncology Suite contains gene expression data from primary, metastatic and benign tumor samples and normal samples, including matched adjacent controls. The suite includes hematological malignancy samples for many well-known cancers.

Specific databases for model animals include the Retrovirus Tagged Cancer Gene Database (RTCGD) that compiled research on retroviral and transposon insertional mutagenesis in mouse tumors.

Gene families

Mutational analysis of entire gene families revealed that genes of the same family have similar functions, as predicted by similar coding sequences and protein domains. Two such classes are the kinase family, involved in adding phosphate groups to proteins and the phosphatase family, involved with removing phosphate groups from proteins. [67] These families were first examined because of their apparent role in transducing cellular signals of cell growth or death. In particular, more than 50% of colorectal cancers carry a mutation in a kinase or phosphatase gene. Phosphatidylinositold 3-kinases (PIK3CA) gene encodes for lipid kinases that commonly contain mutations in colorectal, breast, gastric, lung and various other cancers. [68] [69] Drug therapies can inhibit PIK3CA. Another example is the BRAF gene, one of the first to be implicated in melanomas. [70] BRAF encodes a serine/threonine kinase that is involved in the RAS-RAF-MAPK growth signaling pathway. Mutations in BRAF cause constitutive phosphorylation and activity in 59% of melanomas. Before BRAF, the genetic mechanism of melanoma development was unknown and therefore prognosis for patients was poor. [71]

Mitochondrial DNA

Mitochondrial DNA (mtDNA) mutations are linked the formation of tumors. Four types of mtDNA mutations have been identified: [72]

Point mutations

Point mutations have been observed in the coding and non-coding region of the mtDNA contained in cancer cells. In individuals with bladder, head/neck and lung cancers, the point mutations within the coding region show signs of resembling each other. This suggests that when a healthy cell transforms into a tumor cell (a neoplastic transformation) the mitochondria seem to become homogenous. Abundant point mutations located within the non-coding region, D-loop, of the cancerous mitochondria suggest that mutations within this region might be an important characteristic in some cancers. [72]

Deletions

This type of mutation is sporadically detected due to its small size ( < 1 kb). The appearance of certain specific mtDNA mutations (264-bp deletion and 66-bp deletion in the complex 1 subunit gene ND1) in multiple types of cancer provide some evidence that small mtDNA deletions might appear at the beginning of tumorigenesis. It also suggests that the amount of mitochondria containing these deletions increases as the tumor progresses. An exception is a relatively large deletion that appears in many cancers (known as the "common deletion"), but more mtDNA large scale deletions have been found in normal cells compared to tumor cells. This may be due to a seemingly adaptive process of tumor cells to eliminate any mitochondria that contain these large scale deletions (the "common deletion" is > 4 kb). [72]

Insertions

Two small mtDNA insertions of ~260 and ~520 bp can be present in breast cancer, gastric cancer, hepatocellular carcinoma (HCC) and colon cancer and in normal cells. No correlation between these insertions and cancer are established. [73]

Copy number mutations

The characterization of mtDNA via real-time polymerase chain reaction assays shows the presence of quantitative alteration of mtDNA copy number in many cancers. Increase in copy number is expected to occur because of oxidative stress. On the other hand, decrease is thought to be caused by somatic point mutations in the replication origin site of the H-strand and/or the D310 homopolymeric c-stretch in the D-loop region, mutations in the p53 (tumor suppressor gene) mediated pathway and/or inefficient enzyme activity due to POLG mutations. Any increase/decrease in copy number then remains constant within tumor cells. The fact that the amount of mtDNA is constant in tumor cells suggests that the amount of mtDNA is controlled by a much more complicated system in tumor cells, rather than simply altered as a consequence of abnormal cell proliferation. The role of mtDNA content in human cancers apparently varies for particular tumor types or sites. [72]

Mutations in mitochondrial DNA in various cancers
Cancer TypeLocation of Point mutationsNucleotide Position of DeletionsIncrease of mtDNA copy #Decrease of mtDNA copy #
D-LoopmRNAstRNAsrRNAs
Bladder [74] XXX15,642-15,662
Breast [75] [76] [77] [78] XXXX8470-13,447 and 8482-13459X
Head and neck [75] [79] [80] XXXX8470-13,447 and 8482-13459X
Oral [81] XX8470-13,447 and 8482-13459
Hepatocellular carcinoma (HCC) [82] [83] XXXX306-556 and 3894-3960X
Esophageal [84] XXX8470-13,447 and 8482-13459X
Gastric [85] [86] [87] XXX298-348X
Prostate [88] [89] XX8470-13,447 and 8482-13459X

57.7% (500/867) contained somatic point putations and of the 1172 mutations surveyed 37.8% (443/1127) were located in the D-loop control region, 13.1% (154/1172) were located in the tRNA or rRNA genes and 49.1% (575/1127) were found in the mRNA genes needed for producing complexes required for mitochondrial respiration.

Diagnostic applications

Some anticancer drugs target mtDNA and have shown positive results in killing tumor cells. Research has used mitochondrial mutations as biomarkers for cancer cell therapy. It is easier to target mutation within mitochondrial DNA versus nuclear DNA because the mitochondrial genome is much smaller and easier to screen for specific mutations. MtDNA content alterations found in blood samples might be able to serve as a screening marker for predicting future cancer susceptibility as well as tracking malignant tumor progression. Along with these potential helpful characteristics of mtDNA, it is not under the control of the cell cycle and is important for maintaining ATP generation and mitochondrial homeostasis. These characteristics make targeting mtDNA a practical therapeutic strategy. [72]

Cancer biomarkers

Several biomarkers can be useful in cancer staging, prognosis and treatment. They can range from single-nucleotide polymorphisms (SNPs), chromosomal aberrations, changes in DNA copy number, microsatellite instability, promoter region methylation, or even high or low protein levels. [90] Between 2013 and 2019 only 6.8% of people with cancer in 2 US states underwent genetic testing, suggesting broad under-utilization of information that could improve treatment decisions and patient outcomes. [91]

See also

Related Research Articles

<span class="mw-page-title-main">Tumor suppressor gene</span> Gene that inhibits expression of the tumorigenic phenotype

A tumor suppressor gene (TSG), or anti-oncogene, is a gene that regulates a cell during cell division and replication. If the cell grows uncontrollably, it will result in cancer. When a tumor suppressor gene is mutated, it results in a loss or reduction in its function. In combination with other genetic mutations, this could allow the cell to grow abnormally. The loss of function for these genes may be even more significant in the development of human cancers, compared to the activation of oncogenes.

<span class="mw-page-title-main">Epigenetics</span> Study of DNA modifications that do not change its sequence

In biology, epigenetics is the study of heritable traits, or a stable change of cell function, that happen without changes to the DNA sequence. The Greek prefix epi- in epigenetics implies features that are "on top of" or "in addition to" the traditional genetic mechanism of inheritance. Epigenetics usually involves a change that is not erased by cell division, and affects the regulation of gene expression. Such effects on cellular and physiological phenotypic traits may result from environmental factors, or be part of normal development. They can lead to cancer.

<span class="mw-page-title-main">DNA repair</span> Cellular mechanism

DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encode its genome. In human cells, both normal metabolic activities and environmental factors such as radiation can cause DNA damage, resulting in tens of thousands of individual molecular lesions per cell per day. Many of these lesions cause structural damage to the DNA molecule and can alter or eliminate the cell's ability to transcribe the gene that the affected DNA encodes. Other lesions induce potentially harmful mutations in the cell's genome, which affect the survival of its daughter cells after it undergoes mitosis. As a consequence, the DNA repair process is constantly active as it responds to damage in the DNA structure. When normal repair processes fail, and when cellular apoptosis does not occur, irreparable DNA damage may occur. This can eventually lead to malignant tumors, or cancer as per the two-hit hypothesis.

<span class="mw-page-title-main">Neoplasm</span> Tumor or other abnormal growth of tissue

A neoplasm is a type of abnormal and excessive growth of tissue. The process that occurs to form or produce a neoplasm is called neoplasia. The growth of a neoplasm is uncoordinated with that of the normal surrounding tissue, and persists in growing abnormally, even if the original trigger is removed. This abnormal growth usually forms a mass, which may be called a tumour or tumor.

<span class="mw-page-title-main">ATM serine/threonine kinase</span> Mammalian protein found in Homo sapiens

ATM serine/threonine kinase or Ataxia-telangiectasia mutated, symbol ATM, is a serine/threonine protein kinase that is recruited and activated by DNA double-strand breaks, oxidative stress, topoisomerase cleavage complexes, splicing intermediates, R-loops and in some cases by single-strand DNA breaks. It phosphorylates several key proteins that initiate activation of the DNA damage checkpoint, leading to cell cycle arrest, DNA repair or apoptosis. Several of these targets, including p53, CHK2, BRCA1, NBS1 and H2AX are tumor suppressors.

Carcinogenesis, also called oncogenesis or tumorigenesis, is the formation of a cancer, whereby normal cells are transformed into cancer cells. The process is characterized by changes at the cellular, genetic, and epigenetic levels and abnormal cell division. Cell division is a physiological process that occurs in almost all tissues and under a variety of circumstances. Normally, the balance between proliferation and programmed cell death, in the form of apoptosis, is maintained to ensure the integrity of tissues and organs. According to the prevailing accepted theory of carcinogenesis, the somatic mutation theory, mutations in DNA and epimutations that lead to cancer disrupt these orderly processes by interfering with the programming regulating the processes, upsetting the normal balance between proliferation and cell death. This results in uncontrolled cell division and the evolution of those cells by natural selection in the body. Only certain mutations lead to cancer whereas the majority of mutations do not.

<span class="mw-page-title-main">DNA mismatch repair</span> System for fixing base errors of DNA replication

DNA mismatch repair (MMR) is a system for recognizing and repairing erroneous insertion, deletion, and mis-incorporation of bases that can arise during DNA replication and recombination, as well as repairing some forms of DNA damage.

p16 Mammalian protein found in Homo sapiens

p16, is a protein that slows cell division by slowing the progression of the cell cycle from the G1 phase to the S phase, thereby acting as a tumor suppressor. It is encoded by the CDKN2A gene. A deletion in this gene can result in insufficient or non-functional p16, accelerating the cell cycle and resulting in many types of cancer.

<span class="mw-page-title-main">MSH2</span> Protein-coding gene in the species Homo sapiens

DNA mismatch repair protein Msh2 also known as MutS homolog 2 or MSH2 is a protein that in humans is encoded by the MSH2 gene, which is located on chromosome 2. MSH2 is a tumor suppressor gene and more specifically a caretaker gene that codes for a DNA mismatch repair (MMR) protein, MSH2, which forms a heterodimer with MSH6 to make the human MutSα mismatch repair complex. It also dimerizes with MSH3 to form the MutSβ DNA repair complex. MSH2 is involved in many different forms of DNA repair, including transcription-coupled repair, homologous recombination, and base excision repair.

<span class="mw-page-title-main">Methylated-DNA-protein-cysteine methyltransferase</span> Mammalian protein found in Homo sapiens

Methylated-DNA--protein-cysteine methyltransferase(MGMT), also known as O6-alkylguanine DNA alkyltransferaseAGT, is a protein that in humans is encoded by the MGMT gene. MGMT is crucial for genome stability. It repairs the naturally occurring mutagenic DNA lesion O6-methylguanine back to guanine and prevents mismatch and errors during DNA replication and transcription. Accordingly, loss of MGMT increases the carcinogenic risk in mice after exposure to alkylating agents. The two bacterial isozymes are Ada and Ogt.

<span class="mw-page-title-main">CDKN2B</span> Protein-coding gene in the species Homo sapiens

Cyclin-dependent kinase 4 inhibitor B also known as multiple tumor suppressor 2 (MTS-2) or p15INK4b is a protein that is encoded by the CDKN2B gene in humans.

<span class="mw-page-title-main">KMT2D</span> Protein-coding gene in humans

Histone-lysine N-methyltransferase 2D (KMT2D), also known as MLL4 and sometimes MLL2 in humans and Mll4 in mice, is a major mammalian histone H3 lysine 4 (H3K4) mono-methyltransferase. It is part of a family of six Set1-like H3K4 methyltransferases that also contains KMT2A, KMT2B, KMT2C, KMT2F, and KMT2G.

Somatic evolution is the accumulation of mutations and epimutations in somatic cells during a lifetime, and the effects of those mutations and epimutations on the fitness of those cells. This evolutionary process has first been shown by the studies of Bert Vogelstein in colon cancer. Somatic evolution is important in the process of aging as well as the development of some diseases, including cancer.

Synthetic lethality is defined as a type of genetic interaction where the combination of two genetic events results in cell death or death of an organism. Although the foregoing explanation is wider than this, it is common when referring to synthetic lethality to mean the situation arising by virtue of a combination of deficiencies of two or more genes leading to cell death, whereas a deficiency of only one of these genes does not. In a synthetic lethal genetic screen, it is necessary to begin with a mutation that does not result in cell death, although the effect of that mutation could result in a differing phenotype, and then systematically test other mutations at additional loci to determine which, in combination with the first mutation, causes cell death arising by way of deficiency or abolition of expression.

<span class="mw-page-title-main">8-Oxo-2'-deoxyguanosine</span> Chemical compound

8-Oxo-2'-deoxyguanosine (8-oxo-dG) is an oxidized derivative of deoxyguanosine. 8-Oxo-dG is one of the major products of DNA oxidation. Concentrations of 8-oxo-dG within a cell are a measurement of oxidative stress.

Cancer genome sequencing is the whole genome sequencing of a single, homogeneous or heterogeneous group of cancer cells. It is a biochemical laboratory method for the characterization and identification of the DNA or RNA sequences of cancer cell(s).

Genome instability refers to a high frequency of mutations within the genome of a cellular lineage. These mutations can include changes in nucleic acid sequences, chromosomal rearrangements or aneuploidy. Genome instability does occur in bacteria. In multicellular organisms genome instability is central to carcinogenesis, and in humans it is also a factor in some neurodegenerative diseases such as amyotrophic lateral sclerosis or the neuromuscular disease myotonic dystrophy.

<span class="mw-page-title-main">Cancer epigenetics</span> Field of study in cancer research

Cancer epigenetics is the study of epigenetic modifications to the DNA of cancer cells that do not involve a change in the nucleotide sequence, but instead involve a change in the way the genetic code is expressed. Epigenetic mechanisms are necessary to maintain normal sequences of tissue specific gene expression and are crucial for normal development. They may be just as important, if not even more important, than genetic mutations in a cell's transformation to cancer. The disturbance of epigenetic processes in cancers, can lead to a loss of expression of genes that occurs about 10 times more frequently by transcription silencing than by mutations. As Vogelstein et al. points out, in a colorectal cancer there are usually about 3 to 6 driver mutations and 33 to 66 hitchhiker or passenger mutations. However, in colon tumors compared to adjacent normal-appearing colonic mucosa, there are about 600 to 800 heavily methylated CpG islands in the promoters of genes in the tumors while these CpG islands are not methylated in the adjacent mucosa. Manipulation of epigenetic alterations holds great promise for cancer prevention, detection, and therapy. In different types of cancer, a variety of epigenetic mechanisms can be perturbed, such as the silencing of tumor suppressor genes and activation of oncogenes by altered CpG island methylation patterns, histone modifications, and dysregulation of DNA binding proteins. There are several medications which have epigenetic impact, that are now used in a number of these diseases.

CpG island hypermethylation is a phenomenon that is important for the regulation of gene expression in cancer cells, as an epigenetic control aberration responsible for gene inactivation. Hypermethylation of CpG islands has been described in almost every type of tumor.

Pharmacoepigenetics is an emerging field that studies the underlying epigenetic marking patterns that lead to variation in an individual's response to medical treatment.

References

  1. 1 2 Strausberg RL, Simpson AJ, Old LJ, Riggins GJ (May 2004). "Oncogenomics and the development of new cancer therapies". Nature. 429 (6990): 469–74. Bibcode:2004Natur.429..469S. doi:10.1038/nature02627. PMID   15164073. S2CID   37628107.
  2. Ting AH, McGarvey KM, Baylin SB (2006). "The cancer epigenome—components and functional correlates". Genes Dev. 20 (23): 3215–31. doi: 10.1101/gad.1464906 . PMID   17158741.
  3. Jones PA, Baylin SB (2007). "The epigenomics of cancer". Cell. 128 (4): 683–92. doi:10.1016/j.cell.2007.01.029. PMC   3894624 . PMID   17320506.
  4. Li D, Zhang B, Xing X, Wang T (2015). "Combining MeDIP-seq and MRE-seq to investigate genome-wide CpG methylation". Methods. 72: 29–40. doi:10.1016/j.ymeth.2014.10.032. PMC   4300244 . PMID   25448294.
  5. Wei J, Li G, Dang S, Zhou Y, Zeng K, Liu M (2016). "Discovery and Validation of Hypermethylated Markers for Colorectal Cancer". Dis. Markers. 2016: 2192853. doi: 10.1155/2016/2192853 . PMC   4963574 . PMID   27493446.
  6. 1 2 Strausberg RL, Simpson AJ (January 2010). "Whole-genome cancer analysis as an approach to deeper understanding of tumour biology". Br. J. Cancer. 102 (2): 243–8. doi:10.1038/sj.bjc.6605497. PMC   2816661 . PMID   20029419.
  7. Vogelstein B, Papadopoulos N, Velculescu VE, Zhou S, Diaz LA, Kinzler KW (2013). "Cancer genome landscapes". Science. 339 (6127): 1546–58. Bibcode:2013Sci...339.1546V. doi:10.1126/science.1235122. PMC   3749880 . PMID   23539594.
  8. Luo Y, Wong CJ, Kaz AM, Dzieciatkowski S, Carter KT, Morris SM, Wang J, Willis JE, Makar KW, Ulrich CM, Lutterbaugh JD, Shrubsole MJ, Zheng W, Markowitz SD, Grady WM (2014). "Differences in DNA methylation signatures reveal multiple pathways of progression from adenoma to colorectal cancer". Gastroenterology. 147 (2): 418–29.e8. doi:10.1053/j.gastro.2014.04.039. PMC   4107146 . PMID   24793120.
  9. Ley TJ, Mardis ER, Ding L, Fulton B, McLellan MD, Chen K, et al. (November 2008). "DNA sequencing of a cytogenetically normal acute myeloid leukaemia genome". Nature. 456 (7218): 66–72. Bibcode:2008Natur.456...66L. doi:10.1038/nature07485. PMC   2603574 . PMID   18987736.
  10. 1 2 Peikoff, Kira (2015-10-16). "What Miraculous Recoveries Tell Us About Beating Cancer". Popular Mechanics. Retrieved 2016-04-28.
  11. Bardelli A.; Velculescu V.E. (2005). "Mutational analysis of gene families in human cancer". Current Opinion in Genetics & Development. 15 (1): 5–12. doi:10.1016/j.gde.2004.12.009. PMID   15661527.
  12. Benvenuti S.; Arena S.; Bardelli A. (2005). "Identification of cancer genes by mutational profiling of tumor genomes". FEBS Letters. 579 (8): 1884–1890. doi:10.1016/j.febslet.2005.02.015. PMID   15763568. S2CID   31708201.
  13. Shih I.M.; Wang T.L. (2005). "Apply innovative technologies to explore cancer genome". Current Opinion in Oncology. 17 (1): 33–38. doi:10.1097/01.cco.0000147382.97085.e4. PMID   15608510. S2CID   39104975.
  14. Greshock J, Naylor TL, Margolin A, Diskin S, Cleaver SH, Futreal PA, et al. (January 2004). "1-Mb resolution array-based comparative genomic hybridization using a BAC clone set optimized for cancer gene analysis". Genome Res. 14 (1): 179–87. doi:10.1101/gr.1847304. PMC   314295 . PMID   14672980.
  15. Lucito R, Healy J, Alexander J, Reiner A, Esposito D, Chi M, et al. (October 2003). "Representational oligonucleotide microarray analysis: a high-resolution method to detect genome copy number variation". Genome Res. 13 (10): 2291–305. doi:10.1101/gr.1349003. PMC   403708 . PMID   12975311.
  16. Hu M, Yao J, Polyak K (2006). "Methylation-specific digital karyotyping". Nat Protoc. 1 (3): 1621–36. doi:10.1038/nprot.2006.278. PMID   17406428. S2CID   10554933.
  17. Körner H, Epanchintsev A, Berking C, Schuler-Thurner B, Speicher MR, Menssen A, Hermeking H (January 2007). "Digital karyotyping reveals frequent inactivation of the dystrophin/DMD gene in malignant melanoma". Cell Cycle. 6 (2): 189–98. doi: 10.4161/cc.6.2.3733 . PMID   17314512.
  18. Volik S, Zhao S, Chin K, Brebner JH, Herndon DR, Tao Q, et al. (June 2003). "End-sequence profiling: sequence-based analysis of aberrant genomes". Proc. Natl. Acad. Sci. U.S.A. 100 (13): 7696–701. Bibcode:2003PNAS..100.7696V. doi: 10.1073/pnas.1232418100 . PMC   164650 . PMID   12788976.
  19. Van, de Vijver M.J.; et al. (2002). "A gene-expression signature as a predictor of survival in breast cancer". New England Journal of Medicine. 347 (25): 1999–2009. doi:10.1056/NEJMoa021967. hdl: 1874/15577 . PMID   12490681.
  20. van 't Veer LJ, Dai H, van de Vijver MJ, He YD, Hart AA, Bernards R, Friend SH (2003). "Expression profiling predicts outcome in breast cancer". Breast Cancer Res. 5 (1): 57–8. doi: 10.1186/bcr562 . PMC   154139 . PMID   12559048.
  21. Xu Q.; Lee C. (2003). "Discovery of novel splice forms and functional analysis of cancer-specific alternative splicing in human expressed sequences". Nucleic Acids Research. 31 (19): 5635–5643. doi:10.1093/nar/gkg786. PMC   206480 . PMID   14500827.
  22. Gonzalez-Perez A, Mustonen V, Reva B, Ritchie GR, Creixell P, Karchin R, et al. (August 2013). "Computational approaches to identify functional genetic variants in cancer genomes". Nat. Methods. 10 (8): 723–9. doi:10.1038/nmeth.2562. PMC   3919555 . PMID   23900255.
  23. Hanash SM (September 2000). "Operomics: molecular analysis of tissues from DNA to RNA to protein". Clin. Chem. Lab. Med. 38 (9): 805–13. doi:10.1515/CCLM.2000.116. PMID   11097332. S2CID   34163524.
  24. Peeper D, Berns A (June 2006). "Cross-species oncogenomics in cancer gene identification". Cell. 125 (7): 1230–3. doi: 10.1016/j.cell.2006.06.018 . PMID   16814709.
  25. Rogozin IB, Pavlov YI, Goncearenco A, De S, Lada AG, Poliakov E, Panchenko AR, Cooper DN (November 2018). "Mutational signatures and mutable motifs in cancer genomes". Brief. Bioinformatics. 19 (6): 1085–1101. doi:10.1093/bib/bbx049. PMC   6454500 . PMID   28498882.
  26. Gao D, Herman JG, Guo M (2016). "The clinical value of aberrant epigenetic changes of DNA damage repair genes in human cancer". Oncotarget. 7 (24): 37331–37346. doi:10.18632/oncotarget.7949. PMC   5095080 . PMID   26967246.
  27. Kastan MB (2008). "DNA damage responses: mechanisms and roles in human disease: 2007 G.H.A. Clowes Memorial Award Lecture" (PDF). Mol. Cancer Res. 6 (4): 517–24. doi: 10.1158/1541-7786.MCR-08-0020 . PMID   18403632.
  28. Bernstein, C; Prasad, AR; Nfonsam, V; Bernstein, H. (2013). "Chapter 16: DNA Damage, DNA Repair and Cancer". In Chen, Clark (ed.). New Research Directions in DNA Repair. BoD – Books on Demand. p. 413. ISBN   978-953-51-1114-6.
  29. O'Hagan HM, Mohammad HP, Baylin SB (2008). "Double strand breaks can initiate gene silencing and SIRT1-dependent onset of DNA methylation in an exogenous promoter CpG island". PLOS Genetics. 4 (8): e1000155. doi: 10.1371/journal.pgen.1000155 . PMC   2491723 . PMID   18704159.
  30. Cuozzo C, Porcellini A, Angrisano T, et al. (July 2007). "DNA damage, homology-directed repair, and DNA methylation". PLOS Genetics. 3 (7): e110. doi: 10.1371/journal.pgen.0030110 . PMC   1913100 . PMID   17616978.
  31. Coulondre C, Miller JH, Farabaugh PJ, Gilbert W (August 1978). "Molecular basis of base substitution hotspots in Escherichia coli". Nature. 274 (5673): 775–80. Bibcode:1978Natur.274..775C. doi:10.1038/274775a0. PMID   355893. S2CID   4165194.
  32. Cooper DN, Youssoufian H (February 1988). "The CpG dinucleotide and human genetic disease". Hum. Genet. 78 (2): 151–5. doi:10.1007/bf00278187. PMID   3338800. S2CID   41948691.
  33. 1 2 Rogozin IB, Kolchanov NA (November 1992). "Somatic hypermutagenesis in immunoglobulin genes. II. Influence of neighbouring base sequences on mutagenesis". Biochim. Biophys. Acta. 1171 (1): 11–8. doi:10.1016/0167-4781(92)90134-l. ISSN   0006-3002. PMID   1420357.
  34. Rogozin IB, Pavlov YI, Bebenek K, Matsuda T, Kunkel TA (June 2001). "Somatic mutation hotspots correlate with DNA polymerase eta error spectrum". Nat. Immunol. 2 (6): 530–6. doi:10.1038/88732. ISSN   1529-2908. PMID   11376340. S2CID   12807889.
  35. Nik-Zainal S, Alexandrov LB, Wedge DC, Van Loo P, Greenman CD, Raine K, et al. (May 2012). "Mutational processes molding the genomes of 21 breast cancers". Cell. 149 (5): 979–93. doi:10.1016/j.cell.2012.04.024. PMC   3414841 . PMID   22608084.
  36. Alexandrov LB, Nik-Zainal S, Wedge DC, Campbell PJ, Stratton MR (January 2013). "Deciphering signatures of mutational processes operative in human cancer". Cell Rep. 3 (1): 246–59. doi:10.1016/j.celrep.2012.12.008. PMC   3588146 . PMID   23318258.
  37. Rosenthal R, McGranahan N, Herrero J, Taylor BS, Swanton C (February 2016). "DeconstructSigs: delineating mutational processes in single tumors distinguishes DNA repair deficiencies and patterns of carcinoma evolution". Genome Biol. 17: 31. doi: 10.1186/s13059-016-0893-4 . PMC   4762164 . PMID   26899170.
  38. Goncearenco A, Rager SL, Li M, Sang QX, Rogozin IB, Panchenko AR (July 2017). "Exploring background mutational processes to decipher cancer genetic heterogeneity". Nucleic Acids Res. 45 (W1): W514–W522. doi:10.1093/nar/gkx367. PMC   5793731 . PMID   28472504.
  39. 1 2 3 Muller FL, Colla S, Aquilanti E, Manzo VE, Genovese G, Lee J, et al. (August 2012). "Passenger deletions generate therapeutic vulnerabilities in cancer". Nature. 488 (7411): 337–42. Bibcode:2012Natur.488..337M. doi:10.1038/nature11331. PMC   3712624 . PMID   22895339.
  40. Muller FL, Aquilanti EA, DePinho RA (November 2015). "Collateral Lethality: A new therapeutic strategy in oncology". Trends Cancer. 1 (3): 161–173. doi:10.1016/j.trecan.2015.10.002. PMC   4746004 . PMID   26870836.
  41. Poyner RR, Reed GH (August 1992). "Structure of the bis divalent cation complex with phosphonoacetohydroxamate at the active site of enolase". Biochemistry. 31 (31): 7166–73. doi:10.1021/bi00146a020. PMID   1322695.
  42. Joseph J, Cruz-Sánchez FF, Carreras J (June 1996). "Enolase activity and isoenzyme distribution in human brain regions and tumors". J. Neurochem. 66 (6): 2484–90. doi:10.1046/j.1471-4159.1996.66062484.x. PMID   8632173. S2CID   24655147.
  43. 1 2 Leonard PG, Satani N, Maxwell D, Lin YH, Hammoudi N, Peng Z, et al. (December 2016). "SF2312 is a natural phosphonate inhibitor of enolase". Nat. Chem. Biol. 12 (12): 1053–1058. doi:10.1038/nchembio.2195. PMC   5110371 . PMID   27723749.
  44. 1 2 Dey P, Baddour J, Muller F, Wu CC, Wang H, Liao WT, et al. (February 2017). "Genomic deletion of malic enzyme 2 confers collateral lethality in pancreatic cancer". Nature. 542 (7639): 119–123. Bibcode:2017Natur.542..119D. doi:10.1038/nature21052. PMC   5398413 . PMID   28099419.
  45. Liou GY, Döppler H, DelGiorno KE, Zhang L, Leitges M, Crawford HC, Murphy MP, Storz P (March 2016). "Mutant KRas-Induced Mitochondrial Oxidative Stress in Acinar Cells Upregulates EGFR Signaling to Drive Formation of Pancreatic Precancerous Lesions". Cell Rep. 14 (10): 2325–36. doi:10.1016/j.celrep.2016.02.029. PMC   4794374 . PMID   26947075.
  46. Oike T, Ogiwara H, Tominaga Y, Ito K, Ando O, Tsuta K, et al. (September 2013). "A synthetic lethality-based strategy to treat cancers harboring a genetic deficiency in the chromatin remodeling factor BRG1". Cancer Res. 73 (17): 5508–18. doi: 10.1158/0008-5472.CAN-12-4593 . PMID   23872584.
  47. Murata S, Zhang C, Finch N, Zhang K, Campo L, Breuer EK (2016). "Predictors and Modulators of Synthetic Lethality: An Update on PARP Inhibitors and Personalized Medicine". Biomed Res Int. 2016: 2346585. doi: 10.1155/2016/2346585 . PMC   5013223 . PMID   27642590.
  48. Lok BH, Carley AC, Tchang B, Powell SN (2013). "RAD52 inactivation is synthetically lethal with deficiencies in BRCA1 and PALB2 in addition to BRCA2 through RAD51-mediated homologous recombination". Oncogene. 32 (30): 3552–8. doi:10.1038/onc.2012.391. PMC   5730454 . PMID   22964643.
  49. Cramer-Morales K, Nieborowska-Skorska M, Scheibner K, Padget M, Irvine DA, Sliwinski T, Haas K, Lee J, Geng H, Roy D, Slupianek A, Rassool FV, Wasik MA, Childers W, Copland M, Müschen M, Civin CI, Skorski T (2013). "Personalized synthetic lethality induced by targeting RAD52 in leukemias identified by gene mutation and expression profile". Blood. 122 (7): 1293–304. doi:10.1182/blood-2013-05-501072. PMC   3744994 . PMID   23836560.
  50. Eshleman JR, Lang EZ, Bowerfind GK, Parsons R, Vogelstein B, Willson JK, Veigl ML, Sedwick WD, Markowitz SD (1995). "Increased mutation rate at the hprt locus accompanies microsatellite instability in colon cancer". Oncogene. 10 (1): 33–7. PMID   7824277.
  51. Le DT, Uram JN, Wang H, Bartlett BR, Kemberling H, Eyring AD, et al. (2015). "PD-1 Blockade in Tumors with Mismatch-Repair Deficiency". N. Engl. J. Med. 372 (26): 2509–20. doi:10.1056/NEJMoa1500596. PMC   4481136 . PMID   26028255.
  52. Watanabe R, Ui A, Kanno S, Ogiwara H, Nagase T, Kohno T, Yasui A (2014). "SWI/SNF factors required for cellular resistance to DNA damage include ARID1A and ARID1B and show interdependent protein stability". Cancer Res. 74 (9): 2465–75. doi: 10.1158/0008-5472.CAN-13-3608 . PMID   24788099.
  53. Raab JR, Resnick S, Magnuson T (2015). "Genome-Wide Transcriptional Regulation Mediated by Biochemically Distinct SWI/SNF Complexes". PLOS Genet. 11 (12): e1005748. doi: 10.1371/journal.pgen.1005748 . PMC   4699898 . PMID   26716708.
  54. Lawrence MS, Stojanov P, Mermel CH, Robinson JT, Garraway LA, Golub TR, Meyerson M, Gabriel SB, Lander ES, Getz G (2014). "Discovery and saturation analysis of cancer genes across 21 tumour types". Nature. 505 (7484): 495–501. Bibcode:2014Natur.505..495L. doi:10.1038/nature12912. PMC   4048962 . PMID   24390350.
  55. Zhang X, Sun Q, Shan M, Niu M, Liu T, Xia B, Liang X, Wei W, Sun S, Zhang Y, Liu XS, Song Q, Yang Y, Ma Y, Liu Y, Yang L, Ren Y, Zhang G, Pang D (2013). "Promoter hypermethylation of ARID1A gene is responsible for its low mRNA expression in many invasive breast cancers". PLOS ONE. 8 (1): e53931. Bibcode:2013PLoSO...853931Z. doi: 10.1371/journal.pone.0053931 . PMC   3549982 . PMID   23349767.
  56. Wu JN, Roberts CW (2013). "ARID1A mutations in cancer: another epigenetic tumor suppressor?". Cancer Discov. 3 (1): 35–43. doi:10.1158/2159-8290.CD-12-0361. PMC   3546152 . PMID   23208470.
  57. Bitler BG, Aird KM, Garipov A, Li H, Amatangelo M, Kossenkov AV, Schultz DC, Liu Q, Shih IeM, Conejo-Garcia JR, Speicher DW, Zhang R (2015). "Synthetic lethality by targeting EZH2 methyltransferase activity in ARID1A-mutated cancers". Nat. Med. 21 (3): 231–8. doi:10.1038/nm.3799. PMC   4352133 . PMID   25686104.
  58. Kim KH, Kim W, Howard TP, Vazquez F, Tsherniak A, Wu JN, Wang W, Haswell JR, Walensky LD, Hahn WC, Orkin SH, Roberts CW (2015). "SWI/SNF-mutant cancers depend on catalytic and non-catalytic activity of EZH2". Nat. Med. 21 (12): 1491–6. doi:10.1038/nm.3968. PMC   4886303 . PMID   26552009.
  59. Miller RE, Brough R, Bajrami I, Williamson CT, McDade S, Campbell J, et al. (2016). "Synthetic Lethal Targeting of ARID1A-Mutant Ovarian Clear Cell Tumors with Dasatinib" (PDF). Mol. Cancer Ther. 15 (7): 1472–84. doi: 10.1158/1535-7163.MCT-15-0554 . PMID   27364904.
  60. Kaelin W.G. (2005). "The concept of synthetic lethality in the context of anticancer therapy". Nature Reviews Cancer. 5 (9): 689–698. doi:10.1038/nrc1691. PMID   16110319. S2CID   3218512.
  61. O'Connor M.J.; Martin N.M.B.; Smith G.C.M. (2007). "Targeted cancer therapies based on the inhibition of DNA strand break repair". Oncogene. 26 (56): 7816–7824. doi:10.1038/sj.onc.1210879. PMID   18066095. S2CID   33955861.
  62. Farmer H, McCabe N, Lord CJ, Tutt AN, Johnson DA, Richardson TB, Santarosa M, Dillon KJ, Hickson I, Knights C, Martin NM, Jackson SP, Smith GC, Ashworth A (April 2005). "Targeting the DNA repair defect in BRCA mutant cells as a therapeutic strategy". Nature. 434 (7035): 917–21. Bibcode:2005Natur.434..917F. doi:10.1038/nature03445. PMID   15829967. S2CID   4364706.
  63. Bryant H.E.; Schultz, Niklas; Thomas, Huw D.; Parker, Kayan M.; Flower, Dan; Lopez, Elena; Kyle, Suzanne; Meuth, Mark; Curtin, Nicola J.; Helleday, Thomas; et al. (2005). "Specific killing of BRCA2-deficient tumours with inhibitors of poly(ADP-ribose) polymerase". Nature. 434 (7035): 913–917. Bibcode:2005Natur.434..913B. doi:10.1038/nature03443. PMID   15829966. S2CID   4391043.
  64. Gundem G, Perez-Llamas C, Jene-Sanz A, Kedzierska A, Islam A, Deu-Pons J, Furney SJ, Lopez-Bigas N (February 2010). "IntOGen: integration and data mining of multidimensional oncogenomic data". Nat. Methods. 7 (2): 92–3. doi:10.1038/nmeth0210-92. hdl: 10230/28107 . PMID   20111033. S2CID   205417208.
  65. Gonzalez-Perez A, Perez-Llamas C, Deu-Pons J, Tamborero D, Schroeder MP, Jene-Sanz A, Santos A, Lopez-Bigas N (November 2013). "IntOGen-mutations identifies cancer drivers across tumor types". Nat. Methods. 10 (11): 1081–2. doi:10.1038/nmeth.2642. PMC   5758042 . PMID   24037244.
  66. Rubio-Perez C, Tamborero D, Schroeder MP, Antolín AA, Deu-Pons J, Perez-Llamas C, Mestres J, Gonzalez-Perez A, Lopez-Bigas N (March 2015). "In silico prescription of anticancer drugs to cohorts of 28 tumor types reveals targeting opportunities". Cancer Cell. 27 (3): 382–96. doi: 10.1016/j.ccell.2015.02.007 . hdl: 10230/33093 . PMID   25759023.
  67. Blume-Jensen P, Hunter T (May 2001). "Oncogenic kinase signalling". Nature. 411 (6835): 355–65. Bibcode:2001Natur.411..355B. doi:10.1038/35077225. PMID   11357143. S2CID   4428819.
  68. Bardelli A, et al. (2003). "Mutational analysis of the tyrosine kinome in colorectal cancers". Science. 300 (5621): 949. doi:10.1126/science.1082596. PMID   12738854. S2CID   85934154.
  69. Samuels Y, Wang Z, Bardelli A, Silliman N, Ptak J, Szabo S, Yan H, Gazdar A, Powell SM, Riggins GJ, Willson JK, Markowitz S, Kinzler KW, Vogelstein B, Velculescu VE (April 2004). "High frequency of mutations of the PIK3CA gene in human cancers". Science. 304 (5670): 554. doi:10.1126/science.1096502. PMID   15016963. S2CID   10147415.
  70. Davies H, Bignell GR, Cox C, Stephens P, Edkins S, Clegg S, et al. (June 2002). "Mutations of the BRAF gene in human cancer" (PDF). Nature. 417 (6892): 949–54. Bibcode:2002Natur.417..949D. doi:10.1038/nature00766. PMID   12068308. S2CID   3071547.
  71. Danson S.; Lorigan P. (2005). "Improving outcomes in advanced malignant melanoma – Update on systemic therapy". Drugs. 65 (6): 733–743. doi:10.2165/00003495-200565060-00002. PMID   15819587. S2CID   46969987.
  72. 1 2 3 4 5 Yu, Man (2012). Somatic Mitochondrial DNA Mutations in Human Cancers. Advances in Clinical Chemistry. Vol. 57. pp. 99–138. doi:10.1016/B978-0-12-394384-2.00004-8. ISBN   9780123943842. PMID   22870588.
  73. Hung, W.Y.; J.C. Lin; L.M. Lee; et al. (2008). "Tandem duplication/triplication correlated with poly-cytosine stretch variation in human mitochondrial DNA D-loop region". Mutagenesis. 23 (2): 137–142. doi: 10.1093/mutage/gen002 . PMID   18252697.
  74. Fliss, M. S.; Usadel, H.; Caballero, O. L.; et al. (2000). "Facile detection of mitochondrial DNA mutations in tumors and bodily fluids". Science. 287 (5460): 2017–2019. Bibcode:2000Sci...287.2017F. doi:10.1126/science.287.5460.2017. PMID   10720328. S2CID   24438279.
  75. 1 2 Dani, M.A.; S.U. Dani; S.P. Lima; et al. (2004). "Less ΔmtDNA4977 than normal in various types of tumors suggests that cancer cells are essentially free of this mutation". Genet. Mol. Res. 3 (3): 395–409. PMID   15614730.
  76. Ye, C.; X.O. Shu; W. Wen; et al. (2008). "Quantitative analysis of mitochondrial DNA 4977-bp deletion in sporadic breast cancer and benign breast diseases". Breast Cancer Res. Treat. 108 (3): 427–434. doi:10.1007/s10549-007-9613-9. PMC   3836503 . PMID   17541740.
  77. Tseng, L.M.; P.H. Yin; C.W. Chi; et al. (2006). "Mitochondrial DNA mutations and mitochondrial DNA depletion in breast cancer". Genes Chromosomes Cancer. 45 (7): 629–638. doi:10.1002/gcc.20326. PMID   16568452. S2CID   21181048.
  78. Zhu, W.; W. Qin; P. Bradley; A. Wessel; C.L. Puckett; E.R. Sauter (2005). "Mitochondrial DNA mutations in breast cancer tissue and in matched nipple aspirate fluid". Carcinogenesis. 26 (1): 145–152. doi: 10.1093/carcin/bgh282 . PMID   15375011.
  79. Zhou S, Kachhap S, Sun W, Wu G, Chuang A, Poeta L, Grumbine L, Mithani SK, Chatterjee A, Koch W, Westra WH, Maitra A, Glazer C, Carducci M, Sidransky D, McFate T, Verma A, Califano JA (May 2007). "Frequency and phenotypic implications of mitochondrial DNA mutations in human squamous cell cancers of the head and neck". Proc. Natl. Acad. Sci. U.S.A. 104 (18): 7540–5. Bibcode:2007PNAS..104.7540Z. doi: 10.1073/pnas.0610818104 . PMC   1863503 . PMID   17456604.
  80. Poetsch M, Petersmann A, Lignitz E, Kleist B (March 2004). "Relationship between mitochondrial DNA instability, mitochondrial DNA large deletions, and nuclear microsatellite instability in head and neck squamous cell carcinomas". Diagn. Mol. Pathol. 13 (1): 26–32. doi:10.1097/00019606-200403000-00005. PMID   15163006. S2CID   21271445.
  81. Tan, D.J.; J. Chang; W.L. Chen; et al. (2004). "Somatic mitochondrial DNA mutations in oral cancer of betel quid chewers". Ann. N. Y. Acad. Sci. 1011 (1): 310–316. Bibcode:2004NYASA1011..310T. doi:10.1196/annals.1293.030. PMID   15126307. S2CID   19794015.
  82. Lee, H.C.; S.H. Li; J.C. Lin; C.C. Wu; D.C. Yeh; Y.H. Wei (2004). "Somatic mutations in the D-loop and decrease in the copy number of mitochondrial DNA in human hepatocellular carcinoma". Mutation Research. 547 (1–2): 71–78. doi:10.1016/j.mrfmmm.2003.12.011. PMID   15013701.
  83. Yin, P.H.; C.C. Wu; J.C. Lin; C.W. Chi; Y.H. Wei; H.C. Lee (2010). "Somatic mutations of mitochondrial genome in hepatocellular carcinoma". Mitochondrion. 10 (2): 174–182. doi:10.1016/j.mito.2009.12.147. PMID   20006738.
  84. Tan, D.J.; J. Chang; L.L. Liu; et al. (2006). "Significance of somatic mutations and content alteration of mitochondrial DNA in esophageal cancer". BMC Cancer. 6: 93. doi: 10.1186/1471-2407-6-93 . PMC   1459869 . PMID   16620376.
  85. Kassauei K, Habbe N, Mullendore ME, Karikari CA, Maitra A, Feldmann G (2006). "Mitochondrial DNA mutations in pancreatic cancer". Int J Gastrointest Cancer. 37 (2–3): 57–64. doi:10.1007/s12029-007-0008-2. PMID   17827523. S2CID   9716204.
  86. Hung WY, Wu CW, Yin PH, Chang CJ, Li AF, Chi CW, Wei YH, Lee HC (March 2010). "Somatic mutations in mitochondrial genome and their potential roles in the progression of human gastric cancer". Biochim. Biophys. Acta. 1800 (3): 264–70. doi:10.1016/j.bbagen.2009.06.006. PMID   19527772.
  87. Wu CW, Yin PH, Hung WY, Li AF, Li SH, Chi CW, Wei YH, Lee HC (September 2005). "Mitochondrial DNA mutations and mitochondrial DNA depletion in gastric cancer". Genes Chromosomes Cancer. 44 (1): 19–28. doi:10.1002/gcc.20213. PMID   15892105. S2CID   11009518.
  88. Yu, J.J.; T. Yan (2010). "Effect of mtDNA mutation on tumor malignant degree in patients with prostate cancer". Aging Male. 13 (3): 159–165. doi:10.3109/13685530903536668. PMID   20136572. S2CID   22017823.
  89. Gomez-Zaera, M.; J. Abril; L. Gonzalez; et al. (2006). "Identification of somatic and germline mitochondrial DNA sequence variants in prostate cancer patients". Mutation Research. 595 (1–2): 42–51. doi:10.1016/j.mrfmmm.2005.10.012. PMID   16472830.
  90. Ludwig JA, Weinstein JN (November 2005). "Biomarkers in cancer staging, prognosis and treatment selection". Nat. Rev. Cancer. 5 (11): 845–56. doi:10.1038/nrc1739. PMID   16239904. S2CID   25540232.
  91. Kurian (July 3, 2023). "Germline Genetic Testing After Cancer Diagnosis". JAMA. 330 (1): 43–51. doi:10.1001/jama.2023.9526. PMC   10242510 . PMID   37276540 . Retrieved 4 July 2023.