Mitochondria are vital organelles with their own DNA (mtDNA). mtDNA is circular and composed of heavy and light chains that are structurally more accessible than nuclear DNA (nDNA). While nDNA is typically diploid, the number of mtDNA copies per cell is higher and varies considerably during development and between tissues. Compared with nDNA, mtDNA is more prone to damage that is positively linked to many diseases, including cancer. Similar to nDNA, mtDNA undergoes repair processes, although these mechanisms are less well understood. In this review, we discuss the various forms of mtDNA damage and repair and their association with cancer initiation and progression. We also propose horizontal mitochondrial transfer as a novel mechanism for replacing damaged mtDNA.
- MeSH
- Humans MeSH
- DNA, Mitochondrial * genetics MeSH
- Mitochondria * genetics metabolism MeSH
- Neoplasms * genetics pathology MeSH
- DNA Repair * MeSH
- DNA Damage * genetics MeSH
- Animals MeSH
- Check Tag
- Humans MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Review MeSH
Although chronic inflammation is implicated in the pathogenesis of diffuse large B-cell lymphoma (DLBCL), the mechanisms responsible are unknown. We demonstrate that the overexpression of the collagen receptor, DDR1, correlates with reduced expression of spindle checkpoint genes, with three transcriptional signatures of aneuploidy and with a higher frequency of copy number alterations, pointing to a potential role for DDR1 in the acquisition of aneuploidy in DLBCL. In support of this, we found that collagen treatment of primary germinal centre B cells transduced with DDR1, not only partially recapitulated the aberrant transcriptional programme of DLBCL but also downregulated the expression of CENPE, a mitotic spindle that has a crucial role in preventing chromosome mis-segregation. CENPE expression was also downregulated following DDR1 activation in two B-cell lymphoma lines and was lost in most DDR1-expressing primary tumours. Crucially, the inhibition of CENPE and the overexpression of a constitutively activated DDR1 were able to induce aneuploidy in vitro. Our findings identify a novel mechanistic link between DDR1 signalling and chromosome instability in B cells and provide novel insights into factors driving aneuploidy in DLBCL.
- MeSH
- Aneuploidy * MeSH
- B-Lymphocytes metabolism MeSH
- Chromosomal Instability * genetics MeSH
- Lymphoma, Large B-Cell, Diffuse * genetics pathology metabolism MeSH
- Collagen pharmacology MeSH
- Humans MeSH
- Cell Line, Tumor MeSH
- Discoidin Domain Receptor 1 * genetics metabolism MeSH
- Gene Expression Regulation, Neoplastic MeSH
- Signal Transduction MeSH
- Check Tag
- Humans MeSH
- Publication type
- Journal Article MeSH
The tumor suppressor gene NKX3.1 and the LPL gene are located in close proximity on chromosome 8, and their deletion has been reported in multiple studies. However, the significance of LPL loss may be misinterpreted due to its co-deletion with NKX3.1, a well-established event in prostate carcinogenesis. This study investigates whether LPL deletion represents a biologically relevant event or occurs merely as a bystander to NKX3.1 loss. We analyzed 28 formalin-fixed paraffin-embedded prostate cancer samples with confirmed LPL deletion and 28 without. Immunohistochemical staining was performed, and previously published whole-genome sequencing data from 103 prostate cancer patients were reanalyzed. Deletion of the 8p21.3 region was associated with higher Gleason grade groups. While NKX3.1 expression was significantly reduced in prostate cancer compared to benign prostatic hyperplasia, LPL protein expression showed no significant difference between cancerous and benign tissue, nor was it affected by the 8p21.3 deletion status. Copy number analysis confirmed the co-deletion of NKX3.1 and LPL in 54 patients. Notably, NKX3.1 loss without accompanying LPL deletion was observed in eight additional cases. These findings suggest that LPL deletion is a passenger event secondary to NKX3.1 loss and underscore the importance of cautious interpretation of cytogenetic findings involving the LPL locus.
- MeSH
- Gene Deletion * MeSH
- Homeodomain Proteins * genetics metabolism MeSH
- Middle Aged MeSH
- Humans MeSH
- Prostatic Neoplasms * genetics pathology metabolism MeSH
- Disease Progression MeSH
- Gene Expression Regulation, Neoplastic MeSH
- Aged MeSH
- Transcription Factors * genetics metabolism MeSH
- Check Tag
- Middle Aged MeSH
- Humans MeSH
- Male MeSH
- Aged MeSH
- Publication type
- Journal Article MeSH
BACKGROUND: Hereditary α-tryptasemia, a genetic trait caused by increased α-tryptase copy number, is associated with idiopathic and venom anaphylaxis. OBJECTIVE: We aimed to determine the impact of tryptase genotypes on drug-induced anaphylaxis. METHODS: A prospective discovery cohort of 99 patients from a referral center in Slovenia with acute anaphylaxis to drugs underwent tryptase genotyping by droplet digital PCR. For validation, we included a cohort of 26 patients from the Czech Republic. Associated inciting agents and the severity of the reactions were subsequently examined. RESULTS: Hereditary α-tryptasemia was associated with drug-induced anaphylaxis with a prevalence of 13% (n = 13 of 99) in the discovery cohort and 15% in the validation cohort (n = 4 of 26). Hereditary α-tryptasemia was identified in every individual with elevated basal serum tryptase levels (11.6-21.9 ng/mL; n = 14) within both cohorts of patients. Hereditary α-tryptasemia was more prevalent in individuals with antibiotic- or mAb-induced anaphylaxis in both the discovery and validation cohorts (n = 13 of 51; 26%) compared to those with anaphylaxis resulting from neuromuscular blocking agents, nonsteroidal anti-inflammatory drugs, contrast, chlorhexidine, or other drugs (n = 5 of 74; 7%; P = .02; odds ratio = 4.1; 95% CI, 1.3-11.1). Overall, we found fewer individuals with no ⍺-tryptase than in the general population, and there was a trend for subjects with more ⍺-tryptase copies to have more severe reactions. Thus, among subjects with three ⍺-tryptase copies, the prevalence of severe anaphylaxis was 73%, compared with 59% with one to two ⍺-tryptase copies and 58% for subjects without ⍺-tryptase. CONCLUSIONS: Risk for anaphylaxis to antibiotics and biologics is associated with inherited differences in α-tryptase-encoding copies at Tryptase α/β1.
- MeSH
- Anaphylaxis * genetics epidemiology MeSH
- Anti-Bacterial Agents * adverse effects MeSH
- Adult MeSH
- Genotype MeSH
- Drug Hypersensitivity * genetics epidemiology MeSH
- Middle Aged MeSH
- Humans MeSH
- Young Adult MeSH
- Antibodies, Monoclonal * adverse effects immunology MeSH
- Prevalence MeSH
- Prospective Studies MeSH
- Aged MeSH
- Mast Cell Activation Syndrome MeSH
- Tryptases * genetics blood MeSH
- Check Tag
- Adult MeSH
- Middle Aged MeSH
- Humans MeSH
- Young Adult MeSH
- Male MeSH
- Aged MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
- Geographicals
- Slovenia MeSH
Assessing the biological behavior of uterine inflammatory myofibroblastic tumors (IMTs) remains challenging. This study evaluated previously proposed risk schemes and features in 9 IMTs (6 indolent, 3 aggressive) by integrating clinicopathological features, immunohistochemistry, and next-generation sequencing (NGS). High-risk features (necrosis, infiltrative growth, nuclear atypia) were present in both groups, with LVSI in 1/3 of aggressive IMTs. Aberrant p16 expression and CDKN2A/2B deletions were noted in 2/3 aggressive cases. All cases harbored ALK fusions, wild-type p53, and lacked pathogenic gene mutations. Aggressive cases harbored arm-level and segmental copy number gains/losses at chr 1, 2, X, and had significantly reduced AR expression. The clinicopathological risk stratification score (CRSS) predicted the biological behavior correctly in cases with complete clinicopathological data (size, mitoses, age, infiltrative growth). Two morcellated cases (one indolent and one aggressive) would have been predicted as low risk based solely on the absence of pathogenic mutations. Hereby, the reliability of the proposed CRSS was confirmed. Aberrant p16 expression predicted malignant behavior in 2/3 aggressive cases. Absence of pathogenic mutations or presence of large scale CNVs does not seem to be a predictor of clinical behavior. Additional studies and NGS analyses of more cases may improve risk stratification for patients with incomplete clinicopathological information and may reveal additional risk stratifiers (such as the suggested large-scale CNVs or AR downregulation) for IMTs.
- MeSH
- Adult MeSH
- Immunohistochemistry MeSH
- Cyclin-Dependent Kinase Inhibitor p16 MeSH
- Middle Aged MeSH
- Humans MeSH
- Biomarkers, Tumor * genetics analysis MeSH
- Uterine Neoplasms * pathology genetics MeSH
- Neoplasms, Muscle Tissue * pathology genetics MeSH
- Aged MeSH
- High-Throughput Nucleotide Sequencing MeSH
- Check Tag
- Adult MeSH
- Middle Aged MeSH
- Humans MeSH
- Aged MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
Tobacco smoke, alone or combined with alcohol, is the predominant cause of head and neck cancer (HNC). We explore how tobacco exposure contributes to cancer development by mutational signature analysis of 265 whole-genome sequenced HNC samples from eight countries. Six tobacco-associated mutational signatures were detected, including some not previously reported. Differences in HNC incidence between countries corresponded with differences in mutation burdens of tobacco-associated signatures, consistent with the dominant role of tobacco in HNC causation. Differences were found in the burden of tobacco-associated signatures between anatomical subsites, suggesting that tissue-specific factors modulate mutagenesis. We identified an association between tobacco smoking and alcohol-related signatures, indicating a combined effect of these exposures. Tobacco smoking was associated with differences in the mutational spectra, repertoire of driver mutations in cancer genes and patterns of copy number change. Our results demonstrate the multiple pathways by which tobacco smoke can influence the evolution of cancer cell clones.
- MeSH
- Tobacco Smoking * adverse effects MeSH
- Smoking adverse effects MeSH
- Humans MeSH
- Mutation MeSH
- Mutagenesis * genetics MeSH
- Head and Neck Neoplasms * genetics etiology epidemiology MeSH
- Whole Genome Sequencing MeSH
- DNA Copy Number Variations MeSH
- Check Tag
- Humans MeSH
- Male MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
Cancer cells display complex genomic aberrations that include large-scale genetic rearrangements and epigenetic modulation that are not easily captured by short-read sequencing. This study presents a novel approach for simultaneous profiling of long-range genetic and epigenetic changes in matched cancer samples, focusing on clear cell renal cell carcinoma (ccRCC). ccRCC is a common kidney cancer subtype frequently characterized by a 3p deletion and the inactivation of the von Hippel-Lindau (VHL) gene. We performed integrated genetic, cytogenetic, and epigenetic analyses on paired tumor and adjacent nontumorous tissue samples. Optical genome mapping identified genomic aberrations as structural and copy number variations, complementing exome-sequencing findings. Single-molecule methylome and hydroxymethylome mapping revealed a significant global reduction in 5hmC level in both sample pairs, and a correlation between both epigenetic signals and gene expression was observed. The single-molecule epigenetic analysis identified numerous differentially modified regions, some implicated in ccRCC pathogenesis, including the genes VHL, PRCC, and PBRM1. Notably, pathways related to metabolism and cancer development were significantly enriched among these differential regions. This study demonstrates the feasibility of integrating optical genome and epigenome mapping for comprehensive characterization of matched tumor and adjacent tissue, uncovering both established and novel somatic aberrations.
- MeSH
- DNA-Binding Proteins MeSH
- Epigenesis, Genetic * genetics MeSH
- Epigenome * genetics MeSH
- Carcinoma, Renal Cell * genetics pathology MeSH
- Middle Aged MeSH
- Humans MeSH
- Chromosome Mapping methods MeSH
- DNA Methylation * genetics MeSH
- Von Hippel-Lindau Tumor Suppressor Protein genetics MeSH
- Kidney Neoplasms * genetics pathology MeSH
- Gene Expression Regulation, Neoplastic MeSH
- Transcription Factors MeSH
- DNA Copy Number Variations * genetics MeSH
- Check Tag
- Middle Aged MeSH
- Humans MeSH
- Male MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Research Support, N.I.H., Extramural MeSH
The immunohistochemical (IHC) or fluorescence/chromogenic in situ hybridization (FISH/CISH) assays for assessing HER2 are now recommended by the American Society of Clinical Oncologists and the College of American Pathologists, but there are an increasing number of published studies describing alternative diagnoses at the molecular level. Inspired by these studies, we established a laboratory-developed test (LDT) to analyze HER2 status not only at the gene expression level but also at the gene copy number. A precise copy number calculation was fulfilled including the Control Genomic DNA of known concentration, which allowed subsequent assay validation at the DNA level. The results were reported according to the concordant results of the DNA and RNA approaches. By comparing with IHC determination, completely identical results were found in ten blank samples, which underlines the legitimacy of molecular biological approaches in this diagnostic field. An equivocal sample that was positive by IHC and qPCR was found to be negative by the FISH and so it may change the choice of personalized medicine. The topic of this short communication will hopefully contribute to allowing IVD-certified diagnostics based on the HER2 gene expression profile or copy number to be tested in the Czech Republic as well.
- MeSH
- DNA genetics metabolism MeSH
- Gene Dosage * MeSH
- In Situ Hybridization, Fluorescence * methods MeSH
- Immunohistochemistry * methods MeSH
- Humans MeSH
- Biomarkers, Tumor genetics metabolism MeSH
- Breast Neoplasms genetics metabolism diagnosis MeSH
- Receptor, ErbB-2 * genetics metabolism MeSH
- RNA metabolism genetics analysis MeSH
- Check Tag
- Humans MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
BACKGROUND: Oxidative stress and inflammation are considered predictors of diseases associated with aging. Markers of oxidative stress, inflammation, and endothelial activation were investigated in people with HIV on antiretroviral treatment to determine whether they had an immunosenescent phenotype that might predispose to the development of premature age-related diseases. PATIENTS AND METHODS: This study was conducted on 213 subjects with HIV. The control groups consisted of healthy HIV-negative adults. The level of oxidative stress was measured by assessing the production of malondialdehyde levels, which were detected by thiobarbituric acid reactive substance (TBARS) assay. The level of microparticles indicated the presence of inflammation and endothelial activation was measured by E-selectin levels. Significant differences were determined by appropriate statistical tests, depending on the distribution of variables. Relationships between continuous variables were quantified using Spearman's rank correlation coefficient. RESULTS: TBARS, and microparticle and E-selectin levels were significantly higher in untreated and treated subjects with HIV compared with HIV-negative controls (P<0.001). The levels of the investigated markers were not significantly different between untreated and treated patients and no significant correlation of these markers was found with CD4+ count, CD4+/CD8+ ratio, and the number of HIV-1 RNA copies. CONCLUSIONS: Elevated markers of oxidative stress, inflammatory and endothelial activation were independent of the virologic and immunologic status of people with HIV. These results support the hypothesis that residual viremia in cellular reservoirs of various tissues is a key factor related to the premature aging of the immune system and predisposition to the premature development of diseases associated with aging.
- MeSH
- Biomarkers blood MeSH
- Adult MeSH
- E-Selectin * blood metabolism MeSH
- HIV Infections * drug therapy immunology metabolism MeSH
- Thiobarbituric Acid Reactive Substances metabolism MeSH
- Middle Aged MeSH
- Humans MeSH
- Cell-Derived Microparticles * metabolism MeSH
- Oxidative Stress * MeSH
- Case-Control Studies MeSH
- Check Tag
- Adult MeSH
- Middle Aged MeSH
- Humans MeSH
- Male MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
