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Telomere Homeostasis, Genomic Instability and Cancer

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Oncology".

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 8539

Special Issue Editors


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Guest Editor
Department of Molecular Biology of Cancer, Institute of Experimental Medicine of the Academy of Sciences of the Czech Republic, 142 20 Prague, Czech Republic
Interests: DNA and chromosomal damage; DNA repair; colorectal cancer; pancreatic cancer; cancer risk; cancer prognosis; therapy prediction
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Guest Editor
Division of Molecular Genetic Epidemiology, German Cancer Research Center, Heidelberg, Germany
Interests: melanoma genetics; telomere biology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Impaired DNA repair and disrupted telomere length homeostasis are key events in the initiation, progression and prognosis of several solid malignancies. In recent years evidence has accumulated about the role of the microenvironment in carcinogenesis.

There are several pathways implicated in the maintenance of genomic integrity and the prevention of its instability. These include mainly: (i) DNA repair mechanisms, (ii) DNA replication and mitosis and (iii) telomere maintenance. DNA damage signalling is a prerequisite for the induction of subsequent cellular responses like DNA repair, cell cycle arrest and apoptosis. The crosstalk between proteins involved in DNA repair and apoptosis has been postulated as an essential process in carcinogenesis and in strategies involving cancer treatment. Tumorigenesis is also marked by continuous cellular proliferation through stabilization of short telomeres that allow for processes like aneuploidy. DNA damage sensing and DNA repair are the key processes triggered in response to dysfunctional telomeres. The disruption of telomere homeostasis through DNA damage due to exogenous exposure results in enhanced telomere shortening, leading to replicative senescence.

The mechanisms maintaining genomic integrity and stability are further modulated by the microenvironment (e.g., microbiota), with ultimate induction of proinflammatory and pro-carcinogenic pathways in target epithelium. These processes comprise the production of genotoxins and reactive oxygen species (ROS), resulting in DNA damage, changes in host immune response, induction of chronic inflammation and increase in the conversion of procarcinogens into carcinogens. Recent studies point to similarities between processes leading to carcinogenesis and chronic inflammatory processes. Further, telomere length and telomerase activity in lymphocytes could indicate the magnitude of immune response, with a substantial effect on tumour growth.

Since DNA damage, DNA repair and telomere maintenance represent key players in carcinogenesis, and since the microenvironment is an inseparable part of the process, the aim of this Special issue is to invite papers from experts in the field to contribute to further enhancement of the knowledge on the topic.

Dr. Pavel Vodicka
Prof. Dr. Rajiv Kumar
Guest Editors

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Keywords

  • telomere homeostasis
  • genomic instability
  • microenvironment
  • tumorigenesis
  • cancer risk
  • prognosis
  • susceptibility to therapy

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Published Papers (2 papers)

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17 pages, 4554 KiB  
Article
Identification of Overexpressed Genes in Malignant Pleural Mesothelioma
by Federica Morani, Luisa Bisceglia, Giulia Rosini, Luciano Mutti, Ombretta Melaiu, Stefano Landi and Federica Gemignani
Int. J. Mol. Sci. 2021, 22(5), 2738; https://doi.org/10.3390/ijms22052738 - 8 Mar 2021
Cited by 14 | Viewed by 4225
Abstract
Malignant pleural mesothelioma (MPM) is a fatal tumor lacking effective therapies. The characterization of overexpressed genes could constitute a strategy for identifying drivers of tumor progression as targets for novel therapies. Thus, we performed an integrated gene-expression analysis on RNAseq data of 85 [...] Read more.
Malignant pleural mesothelioma (MPM) is a fatal tumor lacking effective therapies. The characterization of overexpressed genes could constitute a strategy for identifying drivers of tumor progression as targets for novel therapies. Thus, we performed an integrated gene-expression analysis on RNAseq data of 85 MPM patients from TCGA dataset and reference samples from the GEO. The gene list was further refined by using published studies, a functional enrichment analysis, and the correlation between expression and patients’ overall survival. Three molecular signatures defined by 15 genes were detected. Seven genes were involved in cell adhesion and extracellular matrix organization, with the others in control of the mitotic cell division or apoptosis inhibition. Using Western blot analyses, we found that ADAMTS1, PODXL, CIT, KIF23, MAD2L1, TNNT1, and TRAF2 were overexpressed in a limited number of cell lines. On the other hand, interestingly, CTHRC1, E-selectin, SPARC, UHRF1, PRSS23, BAG2, and MDK were abundantly expressed in over 50% of the six MPM cell lines analyzed. Thus, these proteins are candidates as drivers for sustaining the tumorigenic process. More studies with small-molecule inhibitors or silencing RNAs are fully justified and need to be undertaken to better evaluate the cancer-driving role of the targets herewith identified. Full article
(This article belongs to the Special Issue Telomere Homeostasis, Genomic Instability and Cancer)
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Review

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15 pages, 1364 KiB  
Review
Genomic Instability and Cancer Risk Associated with Erroneous DNA Repair
by Ken-ichi Yoshioka, Rika Kusumoto-Matsuo, Yusuke Matsuno and Masamichi Ishiai
Int. J. Mol. Sci. 2021, 22(22), 12254; https://doi.org/10.3390/ijms222212254 - 12 Nov 2021
Cited by 24 | Viewed by 3673
Abstract
Many cancers develop as a consequence of genomic instability, which induces genomic rearrangements and nucleotide mutations. Failure to correct DNA damage in DNA repair defective cells, such as in BRCA1 and BRCA2 mutated backgrounds, is directly associated with increased cancer risk. Genomic rearrangement [...] Read more.
Many cancers develop as a consequence of genomic instability, which induces genomic rearrangements and nucleotide mutations. Failure to correct DNA damage in DNA repair defective cells, such as in BRCA1 and BRCA2 mutated backgrounds, is directly associated with increased cancer risk. Genomic rearrangement is generally a consequence of erroneous repair of DNA double-strand breaks (DSBs), though paradoxically, many cancers develop in the absence of DNA repair defects. DNA repair systems are essential for cell survival, and in cancers deficient in one repair pathway, other pathways can become upregulated. In this review, we examine the current literature on genomic alterations in cancer cells and the association between these alterations and DNA repair pathway inactivation and upregulation. Full article
(This article belongs to the Special Issue Telomere Homeostasis, Genomic Instability and Cancer)
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