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  1. Article ; Online: Self-assembly of DNA parallel double-crossover motifs.

    Lee, Jung Yeon / Yang, Qi / Chang, Xu / Jeziorek, Maciej / Perumal, Devanathan / Olivera, Tiffany R / Etchegaray, Jean-Pierre / Zhang, Fei

    Nanoscale

    2024  Volume 16, Issue 4, Page(s) 1685–1691

    Abstract: DNA double-crossover motifs, including parallel and antiparallel crossovers, serve as the structural foundation for the creation of diverse nanostructures and dynamic devices in DNA nanotechnology. Parallel crossover motifs have unique advantages over ... ...

    Abstract DNA double-crossover motifs, including parallel and antiparallel crossovers, serve as the structural foundation for the creation of diverse nanostructures and dynamic devices in DNA nanotechnology. Parallel crossover motifs have unique advantages over the widely used antiparallel crossover design but have not developed as substantially due to the difficulties in assembly. Here we created 29 designs of parallel double-crossover motifs varying in hybridization pathways, central domain lengths, and crossover locations to investigate their assembly mechanism. Arrays were successfully formed in four distinct designs, and large tubular structures were obtained in seven designs with predefined pathways and central domains appoximately 16 nucleotides in length. The nanotubes obtained from parallel crossover design showed improved nuclease resistance than the ones from the antiparallel counterpart design. Overall, our study provides a basis for the development of generalized assembly rules of DNA parallel crossover systems and opens new opportunities for their potential use in biological systems.
    MeSH term(s) Nucleic Acid Conformation ; DNA/chemistry ; Nanotechnology ; Nanostructures/chemistry ; Nanotubes/chemistry
    Chemical Substances DNA (9007-49-2)
    Language English
    Publishing date 2024-01-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d3nr05119f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: A sirtuin's role in preventing senescence by protecting ribosomal DNA.

    Etchegaray, Jean-Pierre / Mostoslavsky, Raul

    The Journal of biological chemistry

    2018  Volume 293, Issue 28, Page(s) 11251–11252

    Abstract: Ribosomes are encoded by many copies of ribosomal DNA (rDNA) packed into the nucleolus. High rates of transcription combined with highly repetitive sequences render rDNA loci particularly vulnerable to genomic instability, a proposed underlying cause of ... ...

    Abstract Ribosomes are encoded by many copies of ribosomal DNA (rDNA) packed into the nucleolus. High rates of transcription combined with highly repetitive sequences render rDNA loci particularly vulnerable to genomic instability, a proposed underlying cause of cellular senescence. The molecular mechanisms that maintain rDNA stability have remained unclear. A new paper elucidates a sirtuin-dependent mechanism that protects rDNA loci from genomic instability and prevents cellular senescence via heterochromatin silencing mediated by the chromatin remodeler SNF2H. This finding extends our understanding of chromatin dynamics within rDNA regions and offers new mechanistic insights into aging-related pathologies associated with genomic instability.
    MeSH term(s) Aging/genetics ; Aging/metabolism ; Aging/pathology ; Cellular Senescence ; DNA, Ribosomal/genetics ; Epigenesis, Genetic ; Gene Expression Regulation ; Genomic Instability ; Humans ; Sirtuins/genetics ; Sirtuins/metabolism ; Transcription, Genetic
    Chemical Substances DNA, Ribosomal ; SIRT7 protein, human ; Sirtuins (EC 3.5.1.-)
    Language English
    Publishing date 2018-07-13
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.H118.004040
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: TET3-mediated DNA oxidation is essential for intestinal epithelial cell response to stressors.

    Gonzalez, Edward A / Liu, Yue / Wang, Dahui / Jeziorek, Maciej / Bandyopadhyay, Sheila / Rao, Anjana / Gao, Nan / Etchegaray, Jean-Pierre

    Proceedings of the National Academy of Sciences of the United States of America

    2023  Volume 120, Issue 37, Page(s) e2221405120

    Abstract: DNA methylation functions as a repressive epigenetic mark that can be reversed by the Ten-eleven translocation (TET) family of DNA dioxygenases that sequentially oxidize 5-methylcytosine into 5-hydroxymethylcytosine (5hmC), 5-formylcytosine (5fC), and 5- ... ...

    Abstract DNA methylation functions as a repressive epigenetic mark that can be reversed by the Ten-eleven translocation (TET) family of DNA dioxygenases that sequentially oxidize 5-methylcytosine into 5-hydroxymethylcytosine (5hmC), 5-formylcytosine (5fC), and 5-carboxylcytosine (5caC). Both 5fC and 5caC can be excised by DNA base-excision repair factors leading to unmodified cytosines. TET enzymes were recently implicated as potential risk factors for inflammatory bowel disease (IBD), but the contribution of TET-mediated DNA oxidation to intestinal homeostasis and response to environmental stressors are unknown. Here, we show prominent roles of TET3 in regulating mouse intestinal epithelial differentiation and response to luminal stressors. Compared with wild-type littermates, mice with intestinal epithelial cell-specific ablation of
    MeSH term(s) Animals ; Humans ; Mice ; Colitis ; Dioxygenases ; DNA ; Enterocytes ; Oxidation-Reduction ; Paneth Cells
    Chemical Substances Dioxygenases (EC 1.13.11.-) ; DNA (9007-49-2) ; TET3 protein, human (EC 1.-) ; Tet3 protein, mouse (EC 1.13.11.-)
    Language English
    Publishing date 2023-09-05
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2221405120
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Low dose acetyl salicylic acid (LDA) mediates epigenetic changes in preeclampsia placental mesenchymal stem cells similar to cells from healthy pregnancy.

    Krishnamoorthy, Kaila / Sherman, Lauren S / Romagano, Matthew P / El Far, Markos / Etchegaray, Jean-Pierre / Williams, Shauna F / Rameshwar, Pranela

    Placenta

    2023  Volume 137, Page(s) 49–58

    Abstract: Introduction: Preeclampsia (PE) affects 2-8% of all pregnancies, and is the leading cause of maternal and fetal morbidity and mortality. We reported on pathophysiological changes in placenta mesenchymal stem cells (P-MSCs) in PE. P-MSCs can be isolated ... ...

    Abstract Introduction: Preeclampsia (PE) affects 2-8% of all pregnancies, and is the leading cause of maternal and fetal morbidity and mortality. We reported on pathophysiological changes in placenta mesenchymal stem cells (P-MSCs) in PE. P-MSCs can be isolated from different layers of the placenta at the interface between the fetus and mother. The ability of MSCs from other sources to be immune licensed as immune suppressor cells indicated that P-MSCs could mitigate fetal rejection. Acetylsalicylic acid (aspirin) is indicated for treating PE. Indeed, low-dose aspirin is recommended to prevent PE in high risk patients.
    Methods: We conducted robust computational analyses to study changes in gene expression in P-MSCs from PE and healthy term pregnancies as compared with PE-MSCs treated with low dose acetyl salicylic acid (LDA). Confocal microscopy studied phospho-H2AX levels in P-MSCs.
    Results: We identified changes in >400 genes with LDA, similar to levels of healthy pregnancy. The top canonical pathways that incorporate these genes were linked to DNA repair damage - Basic excision repair (BER), Nucleotide excision repair (NER) and DNA replication. A role for the sumoylation (SUMO) pathway, which could regulate gene expression and protein stabilization was significant although reduced as compared to BER and NER pathways. Labeling for phopho-H2AX indicated no evidence of double strand break in PE P-MSCs.
    Discussion: The overlapping of key genes within each pathway suggested a major role for LDA in the epigenetic landscape of PE P-MSCs. Overall, this study showed a new insight into how LDA reset the P-MSCs in PE subjects around the DNA.
    MeSH term(s) Humans ; Female ; Pregnancy ; Aspirin/pharmacology ; Aspirin/therapeutic use ; Pre-Eclampsia/metabolism ; Placenta/metabolism ; Epigenesis, Genetic ; Mesenchymal Stem Cells/metabolism ; Salicylic Acid/metabolism
    Chemical Substances Aspirin (R16CO5Y76E) ; Salicylic Acid (O414PZ4LPZ)
    Language English
    Publishing date 2023-04-13
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 603951-0
    ISSN 1532-3102 ; 0143-4004
    ISSN (online) 1532-3102
    ISSN 0143-4004
    DOI 10.1016/j.placenta.2023.04.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Non-Coding RNAs as Mediators of Epigenetic Changes in Malignancies.

    Kumar, Subhasree / Gonzalez, Edward A / Rameshwar, Pranela / Etchegaray, Jean-Pierre

    Cancers

    2020  Volume 12, Issue 12

    Abstract: Non-coding RNAs (ncRNAs) are untranslated RNA molecules that regulate gene expressions. NcRNAs include small nuclear RNAs (snRNAs), small nucleolar RNAs (snoRNAs), ribosomal RNAs (rRNAs), transfer RNAs (tRNAs), circular RNAs (cRNAs) and piwi-interacting ... ...

    Abstract Non-coding RNAs (ncRNAs) are untranslated RNA molecules that regulate gene expressions. NcRNAs include small nuclear RNAs (snRNAs), small nucleolar RNAs (snoRNAs), ribosomal RNAs (rRNAs), transfer RNAs (tRNAs), circular RNAs (cRNAs) and piwi-interacting RNAs (piRNAs). This review focuses on two types of ncRNAs: microRNAs (miRNAs) or short interfering RNAs (siRNAs) and long non-coding RNAs (lncRNAs). We highlight the mechanisms by which miRNAs and lncRNAs impact the epigenome in the context of cancer. Both miRNAs and lncRNAs have the ability to interact with numerous epigenetic modifiers and transcription factors to influence gene expression. The aberrant expression of these ncRNAs is associated with the development and progression of tumors. The primary reason for their deregulated expression can be attributed to epigenetic alterations. Epigenetic alterations can cause the misregulation of ncRNAs. The experimental evidence indicated that most abnormally expressed ncRNAs impact cellular proliferation and apoptotic pathways, and such changes are cancer-dependent. In vitro and in vivo experiments show that, depending on the cancer type, either the upregulation or downregulation of ncRNAs can prevent the proliferation and progression of cancer. Therefore, a better understanding on how ncRNAs impact tumorigenesis could serve to develop new therapeutic treatments. Here, we review the involvement of ncRNAs in cancer epigenetics and highlight their use in clinical therapy.
    Language English
    Publishing date 2020-12-05
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2527080-1
    ISSN 2072-6694
    ISSN 2072-6694
    DOI 10.3390/cancers12123657
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Interplay between Metabolism and Epigenetics: A Nuclear Adaptation to Environmental Changes.

    Etchegaray, Jean-Pierre / Mostoslavsky, Raul

    Molecular cell

    2016  Volume 62, Issue 5, Page(s) 695–711

    Abstract: The physiological identity of every cell is maintained by highly specific transcriptional networks that establish a coherent molecular program that is in tune with nutritional conditions. The regulation of cell-specific transcriptional networks is ... ...

    Abstract The physiological identity of every cell is maintained by highly specific transcriptional networks that establish a coherent molecular program that is in tune with nutritional conditions. The regulation of cell-specific transcriptional networks is accomplished by an epigenetic program via chromatin-modifying enzymes, whose activity is directly dependent on metabolites such as acetyl-coenzyme A, S-adenosylmethionine, and NAD+, among others. Therefore, these nuclear activities are directly influenced by the nutritional status of the cell. In addition to nutritional availability, this highly collaborative program between epigenetic dynamics and metabolism is further interconnected with other environmental cues provided by the day-night cycles imposed by circadian rhythms. Herein, we review molecular pathways and their metabolites associated with epigenetic adaptations modulated by histone- and DNA-modifying enzymes and their responsiveness to the environment in the context of health and disease.
    MeSH term(s) Adaptation, Physiological ; Animals ; Cell Nucleus/metabolism ; Cellular Microenvironment ; Chromatin Assembly and Disassembly ; Circadian Rhythm ; DNA Methylation ; Energy Metabolism ; Epigenesis, Genetic ; Genetic Predisposition to Disease ; Histones/metabolism ; Humans ; Phenotype ; Transcription, Genetic
    Chemical Substances Histones
    Language English
    Publishing date 2016-06-02
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 1415236-8
    ISSN 1097-4164 ; 1097-2765
    ISSN (online) 1097-4164
    ISSN 1097-2765
    DOI 10.1016/j.molcel.2016.05.029
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Hypomethylating Chemotherapeutic Agents as Therapy for Myelodysplastic Syndromes and Prevention of Acute Myeloid Leukemia.

    Sorrentino, Vincent G / Thota, Srijan / Gonzalez, Edward A / Rameshwar, Pranela / Chang, Victor T / Etchegaray, Jean-Pierre

    Pharmaceuticals (Basel, Switzerland)

    2021  Volume 14, Issue 7

    Abstract: Myelodysplastic Syndromes (MDSs) affect the elderly and can progress to Acute Myeloid Leukemia (AML). Epigenetic alterations including DNA methylation and chromatin modification may contribute to the initiation and progression of these malignancies. DNA ... ...

    Abstract Myelodysplastic Syndromes (MDSs) affect the elderly and can progress to Acute Myeloid Leukemia (AML). Epigenetic alterations including DNA methylation and chromatin modification may contribute to the initiation and progression of these malignancies. DNA hypomethylating agents such as decitabine and azacitidine are used as therapeutic treatments and have shown to promote expression of genes involved in tumor suppression, apoptosis, and immune response. Another anti-cancer drug, the proteasome inhibitor bortezomib, is used as a chemotherapeutic treatment for multiple myeloma (MM). Phase III clinical trials of decitabine and azacitidine used alone and in combination with other chemotherapeutics demonstrated their capacity to treat hematological malignancies and prolong the survival of MDS and AML patients. Although phase III clinical trials examining bortezomib's role in MDS and AML patients are limited, its underlying mechanisms in MM highlight its potential as a chemotherapeutic for such malignancies. Further research is needed to better understand how the epigenetic mechanisms mediated by these chemotherapeutic agents and their targeted gene networks are associated with the development and progression of MDS into AML. This review discusses the mechanisms by which decitabine, azacitidine, and bortezomib alter epigenetic programs and their results from phase III clinical trials.
    Language English
    Publishing date 2021-07-04
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2193542-7
    ISSN 1424-8247
    ISSN 1424-8247
    DOI 10.3390/ph14070641
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Interplay between Metabolism and Epigenetics: A Nuclear Adaptation to Environmental Changes

    Etchegaray, Jean-Pierre / Raul Mostoslavsky

    Molecular cell. 2016 June 02, v. 62, no. 5

    2016  

    Abstract: The physiological identity of every cell is maintained by highly specific transcriptional networks that establish a coherent molecular program that is in tune with nutritional conditions. The regulation of cell-specific transcriptional networks is ... ...

    Abstract The physiological identity of every cell is maintained by highly specific transcriptional networks that establish a coherent molecular program that is in tune with nutritional conditions. The regulation of cell-specific transcriptional networks is accomplished by an epigenetic program via chromatin-modifying enzymes, whose activity is directly dependent on metabolites such as acetyl-coenzyme A, S-adenosylmethionine, and NAD+, among others. Therefore, these nuclear activities are directly influenced by the nutritional status of the cell. In addition to nutritional availability, this highly collaborative program between epigenetic dynamics and metabolism is further interconnected with other environmental cues provided by the day-night cycles imposed by circadian rhythms. Herein, we review molecular pathways and their metabolites associated with epigenetic adaptations modulated by histone- and DNA-modifying enzymes and their responsiveness to the environment in the context of health and disease.
    Keywords acetyl coenzyme A ; circadian rhythm ; enzymes ; epigenetics ; metabolism ; metabolites ; nutritional status ; S-adenosylmethionine ; transcription (genetics)
    Language English
    Dates of publication 2016-0602
    Size p. 695-711.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 1415236-8
    ISSN 1097-4164 ; 1097-2765
    ISSN (online) 1097-4164
    ISSN 1097-2765
    DOI 10.1016/j.molcel.2016.05.029
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Cell Fate by SIRT6 and TETs.

    Etchegaray, Jean-Pierre / Mostoslavsky, Raul

    Cell cycle (Georgetown, Tex.)

    2015  Volume 14, Issue 14, Page(s) 2187–2188

    MeSH term(s) 5-Methylcytosine/analogs & derivatives ; Animals ; Cell Differentiation ; Cytosine/analogs & derivatives ; Cytosine/metabolism ; DNA-Binding Proteins/metabolism ; Embryonic Stem Cells/cytology ; Embryonic Stem Cells/metabolism ; Humans ; Mixed Function Oxygenases ; Proto-Oncogene Proteins/metabolism ; Sirtuins/deficiency ; Sirtuins/genetics ; Sirtuins/metabolism ; Transcription Factors/genetics ; Transcription Factors/metabolism
    Chemical Substances DNA-Binding Proteins ; Proto-Oncogene Proteins ; Transcription Factors ; 5-hydroxymethylcytosine (1123-95-1) ; 5-Methylcytosine (6R795CQT4H) ; Cytosine (8J337D1HZY) ; Mixed Function Oxygenases (EC 1.-) ; TET1 protein, human (EC 1.-) ; TET2 protein, human (EC 1.13.11.-) ; SIRT6 protein, human (EC 3.5.1.-) ; Sirtuins (EC 3.5.1.-)
    Language English
    Publishing date 2015-06-11
    Publishing country United States
    Document type Editorial
    ZDB-ID 2146183-1
    ISSN 1551-4005 ; 1538-4101 ; 1554-8627
    ISSN (online) 1551-4005
    ISSN 1538-4101 ; 1554-8627
    DOI 10.1080/15384101.2015.1060768
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Epigenetic dynamics in cancer stem cell dormancy.

    Ferrer, Alejandra I / Trinidad, Jonathan R / Sandiford, Oleta / Etchegaray, Jean-Pierre / Rameshwar, Pranela

    Cancer metastasis reviews

    2020  Volume 39, Issue 3, Page(s) 721–738

    Abstract: Cancer remains one of the most challenging diseases despite significant advances of early diagnosis and therapeutic treatments. Cancerous tumors are composed of various cell types including cancer stem cells capable of self-renewal, proliferation, ... ...

    Abstract Cancer remains one of the most challenging diseases despite significant advances of early diagnosis and therapeutic treatments. Cancerous tumors are composed of various cell types including cancer stem cells capable of self-renewal, proliferation, differentiation, and invasion of distal tumor sites. Most notably, these cells can enter a dormant cellular state that is resistant to conventional therapies. Thereby, cancer stem cells have the intrinsic potential for tumor initiation, tumor growth, metastasis, and tumor relapse after therapy. Both genetic and epigenetic alterations are attributed to the formation of multiple tumor types. This review is focused on how epigenetic dynamics involving DNA methylation and DNA oxidations are implicated in breast cancer and glioblastoma multiforme. The emergence and progression of these cancer types rely on cancer stem cells with the capacity to enter quiescence also known as a dormant cellular state, which dictates the distinct tumorigenic aggressiveness between breast cancer and glioblastomas.
    MeSH term(s) Animals ; Brain Neoplasms/genetics ; Brain Neoplasms/pathology ; Breast Neoplasms/genetics ; Breast Neoplasms/metabolism ; Breast Neoplasms/pathology ; DNA Methylation ; DNA, Neoplasm/genetics ; DNA, Neoplasm/metabolism ; Epigenesis, Genetic ; Glioblastoma/genetics ; Glioblastoma/metabolism ; Glioblastoma/pathology ; Humans ; Neoplastic Stem Cells/metabolism ; Neoplastic Stem Cells/pathology ; Oxidation-Reduction
    Chemical Substances DNA, Neoplasm
    Language English
    Publishing date 2020-05-11
    Publishing country Netherlands
    Document type Journal Article ; Review
    ZDB-ID 604857-2
    ISSN 1573-7233 ; 0167-7659
    ISSN (online) 1573-7233
    ISSN 0167-7659
    DOI 10.1007/s10555-020-09882-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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