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Epigenetics

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https://www.readbyqxmd.com/read/29334683/epigenetic-silencing-of-the-mlh1-promoter-in-relation-to-the-development-of-gastric-cancer-and-its-use-as-a-biomarker-for-patients-with-microsatellite-instability-a-systematic-analysis
#1
Guimei Hu, Lijun Qin, Xinjun Zhang, Guoliang Ye, Tao Huang
BACKGROUND/AIMS: Human mutL homolog 1 (MLH1) promoter methylation was reported in gastric cancer (GC). This study determined the clinicopathological, prognostic, and diagnostic effects of MLH1 promoter methylation in GC. METHODS: The combined odds ratio (OR) or hazard ratio (HR) and their corresponding 95% confidence intervals (95% CI) were calculated. The pooled sensitivity, specificity, and area under the curve (AUC) were analyzed. RESULTS: A total of 4654 GC patients and 3669 non-malignant controls were identified in this systematic analysis...
January 15, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29334596/the-diversifying-field-of-plant-epigenetics
#2
Katrin Heer, Jeannie Mounger, M Teresa Boquete, Christina L Richards, Lars Opgenoorth
No abstract text is available yet for this article.
February 2018: New Phytologist
https://www.readbyqxmd.com/read/29334252/impact-of-paternal-nutrition-on-epigenetic-patterns
#3
Brandon L Pearson, Dan Ehninger
No abstract text is available yet for this article.
January 15, 2018: Epigenomics
https://www.readbyqxmd.com/read/29334242/development-and-disease-in-a-dish-the-epigenetics-of-neurodevelopmental-disorders
#4
Emily Ma Lewis, Kristen L Kroll
Human neurodevelopmental disorders (NDDs) involve mutations in hundreds of individual genes, with over-representation in genes encoding proteins that alter chromatin structure to modulate gene expression. Here, we highlight efforts to model these NDDs through in vitro differentiation of patient-specific induced pluripotent stem cells into neurons. We discuss how epigenetic regulation controls normal cortical development, how mutations in several classes of epigenetic regulators contribute to NDDs, and approaches for modeling cortical development and function using both directed differentiation and formation of cerebral organoids...
January 15, 2018: Epigenomics
https://www.readbyqxmd.com/read/29333921/targeting-brd4-proteins-suppresses-the-growth-of-nsclc-through-downregulation-of-eif4e-expression
#5
Zhongyuan Gao, Ting Yuan, Xiao Zhou, Ping Ni, Geng Sun, Ping Li, Zhixiang Cheng, Xuerong Wang
Lung cancer is the leading cause of cancer-related death worldwide. Bromodomain and extraterminal domain (BET) proteins act as epigenome readers for gene transcriptional regulation. Among BET family members, BRD4 was well studied, but for its mechanism in non-small cell lung carcinoma has not been elucidated. eIF4E regulates gene translation and has been proved to play an important role in the progression of lung cancer. In this study, we first confirmed that BET inhibitors JQ1 and I-BET151 suppressed the growth of NSCLCs, in parallel with downregulated eIF4E expression...
January 15, 2018: Cancer Biology & Therapy
https://www.readbyqxmd.com/read/29333520/application-of-epigenetic-data-in-human-health-risk-assessment
#6
Ila L Cote, Shaun D McCullough, Ronald N Hines, John J Vandenberg
Despite the many recent advances in the field of epigenetics, application of this knowledge in environmental health risk assessment has been limited. In this paper, we identify opportunities for application of epigenetic data to support health risk assessment. We consider current applications and present a vision for the future.
November 6, 2017: Current Opinion in Toxicology
https://www.readbyqxmd.com/read/29333422/epigenetic-inactivation-of-runx3-in-colorectal-cancer
#7
Eung Jin Shin, Han Jo Kim, Myoung Won Son, Tae Sung Ahn, Hyun Yong Lee, Dae Ro Lim, Sang Byung Bae, Seob Jeon, Hyungjoo Kim, Dongjun Jeong, Moon Soo Lee, Dong-Sun Kim, Jeong Se Noh, Moo-Jun Baek
Purpose: Emerging evidence indicates that runt-related transcription factor 3 (RUNX3) is an important tumor suppressor gene in several cancer types, including colorectal cancer (CRC). However, the clinical significance of RUNX3 inactivation in CRC remains unclear. The aim of this study was to examine the correlation between clinicopathologic factors and RUNX3 hypermethylation/expression in CRC. Methods: Sixty-two CRC patients who were treated at the Soonchunhyang University College of Medicine were recruited in this study...
January 2018: Annals of Surgical Treatment and Research
https://www.readbyqxmd.com/read/29332933/epigenetics-h3k27me3-in-glomerular-disease
#8
Susan J Allison
No abstract text is available yet for this article.
January 15, 2018: Nature Reviews. Nephrology
https://www.readbyqxmd.com/read/29332359/novel-molecular-and-metabolic-aspects-in-osteosarcoma
#9
Evangelos Tsiambas, Panagiotis P Fotiades, Chrissa Sioka, Dimitrios Kotrotsios, Evangelia Gkika, Andreas Fotopoulos, Stylianos N Mastronikolis, Ilianna E Armata, Evangelos Giotakis, Vasileios Ragos
Osteosarcoma (OS) is the most frequent bone-forming malignancy in children and adolescents. Concerning its molecular landscape, there is no a direct relationship with a specific gene, but a combination of genetic events. A broad spectrum of activated oncogenes and downregulated suppressor genes has been already explored and considered crucial for its progressive pathogenesis. Mechanisms of gene deregulation include amplifications, point mutations, allelic losses and also epigenetic abnormalities such as aberrant promoter methylation...
November 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/29332326/carcinogenic-potential-of-antitumor-therapies-is-the-risk-predictable
#10
Ivanka Nenova, Janet Grudeva-Popova
The growing number of successfully cured cancer patients has created a new field in oncogenesis. The life expectancy of such patients has increased, however this favorable event may create enough time for epigenetic events to occur which can cause a new carcinognic event, i.e. a secondary malignancy. The terms in use are second primary malignancies as well as therapy-related neoplasms in case the treatment of the first neoplasm is a direct cause. Second primary malignancies can be hematological neoplasms or solid tumors, with solid tumors having higher frequency...
November 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/29331932/cnv-biology-in-neurodevelopmental-disorders
#11
REVIEW
Toru Takumi, Kota Tamada
Copy number variants (CNVs), characterized in recent years by cutting-edge technology, add complexity to our knowledge of the human genome. CNVs contribute not only to human diversity but also to different kinds of diseases including neurodevelopmental delay, autism spectrum disorder and neuropsychiatric diseases. Interestingly, many pathogenic CNVs are shared among these diseases. Studies suggest that pathophysiology of disease may not be simply attributed to a single driver gene within a CNV but also that multifactorial effects may be important...
January 10, 2018: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/29331887/idh1r132h-promotes-malignant-transformation-of-benign-prostatic-epithelium-by-dysregulating-micrornas-involvement-of-igf1r-akt-stat3-signaling-pathway
#12
Lili Zhang, Mei Qi, Tingting Feng, Jing Hu, Lin Wang, Xinjun Li, Wei Gao, Hui Liu, Meng Jiao, Zhen Wu, Xinnuo Bai, Yifan Bie, Long Liu, Bo Han
Risk stratification using molecular features could potentially help distinguish indolent from aggressive prostate cancer (PCa). Mutations in isocitrate dehydrogenase (IDH) acquire an abnormal enzymatic activity, resulting in the production of 2-hydroxyglutarate and alterations in cellular metabolism, histone modification, and DNA methylation. Mutant IDH1 has been identified in various human malignancies, and IDH1R132H constituted the vast majority of mutational events of IDH1. Most recent studies suggested that IDH1 mutations define a methylator subtype in PCa...
January 11, 2018: Neoplasia: An International Journal for Oncology Research
https://www.readbyqxmd.com/read/29331675/module-analysis-captures-pancancer-genetically-and-epigenetically-deregulated-cancer-driver-genes-for-smoking-and-antiviral-response
#13
Magali Champion, Kevin Brennan, Tom Croonenborghs, Andrew J Gentles, Nathalie Pochet, Olivier Gevaert
The availability of increasing volumes of multi-omics profiles across many cancers promises to improve our understanding of the regulatory mechanisms underlying cancer. The main challenge is to integrate these multiple levels of omics profiles and especially to analyze them across many cancers. Here we present AMARETTO, an algorithm that addresses both challenges in three steps. First, AMARETTO identifies potential cancer driver genes through integration of copy number, DNA methylation and gene expression data...
December 1, 2017: EBioMedicine
https://www.readbyqxmd.com/read/29331496/maternal-betaine-supplementation-attenuates-glucocorticoid-induced-hepatic-lipid-accumulation-through-epigenetic-modification-in-adult-offspring-rats
#14
Nannan Zhao, Shu Yang, Yimin Jia, Bo Sun, Bin He, Ruqian Zhao
There are lots of reports about alleviation of NAFLD by dietary supplements of betaine. However, it remains unclear whether maternal betaine supplementation can also ameliorate NAFLD in offspring. Hence, twenty pregnant rats were fed with a basal diet with or without betaine (1%), and then the female offspring rats were raised at 3 months of age followed by 3 weeks of physiological saline or dexamethasone in a dose of 0.1 mg/kg body mass every day via intraperitoneal injection. In this study, maternal betaine supplementation significantly (P<...
December 11, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/29331468/symposium-review-the-influences-of-heat-stress-on-bovine-mammary-gland-function
#15
S Tao, R M Orellana, X Weng, T N Marins, G E Dahl, J K Bernard
Heat stress reduces cow milk yield and results in a significant economic loss for the dairy industry. During lactation, heat stress lowers milk production by 25 to 40% with half of the decrease in milk synthesis resulting from the reduced feed intake. In vitro studies indicate that primary bovine mammary epithelial cells display greater rates of programmed cell death when exposed to high ambient temperatures, which may lead to a decrease in the total number of mammary epithelial cells in the mammary gland, partially explaining the lower milk production of lactating cows under heat stress...
January 10, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29331027/mir-137-functions-as-a-tumor-suppressor-in-pancreatic-cancer-by-targeting-mrgbp
#16
Feng Ding, Shuang Zhang, Shaoyang Gao, Jian Shang, Yanxia Li, Ning Cui, Qiu Zhao
miRNAs are small noncoding RNAs that act as critical epigenetic regulators in tumor carcinogenesis. In this study, our data showed that miR-137 was significantly downregulated in 58 pairs of human pancreatic cancer (PanCa) tissues and PanCa cell lines. Furthermore, the deregulated miR-137 was correlated with increased tumor size, higher TNM stage, and worse prognosis in pancreatic cancer. Functional studies demonstrated that overexpression of miR-137 dramatically suppressed cell proliferation and induced cell apoptosis in vitro...
January 13, 2018: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29330943/epigenetic-markers-in-circulating-cell-free-dna-as-prognostic-markers-for-survival-of-castration-resistant-prostate-cancer-patients
#17
Rianne J Hendriks, Siebren Dijkstra, Frank P Smit, Johan Vandersmissen, Hendrik Van de Voorde, Peter F A Mulders, Inge M van Oort, Wim Van Criekinge, Jack A Schalken
BACKGROUND: Noninvasive biomarkers to guide personalized treatment for castration-resistant prostate cancer (CRPC) are needed. In this study, we analyzed hypermethylation patterns of two genes (GSTP1 and APC) in plasma cell-free DNA (cfDNA) of CRPC patients. The aim of this study was to analyze the cfDNA concentrations and levels of the epigenetic markers and to assess the value of these biomarkers for prognosis. METHODS: In this prospective study, patients were included before starting new treatment after developing CRPC...
January 12, 2018: Prostate
https://www.readbyqxmd.com/read/29330773/mechanistic-regulation-of-epithelial-to-mesenchymal-transition-through-ras-signaling-pathway-and-therapeutic-implications-in-human-cancer
#18
REVIEW
Kiran Tripathi, Minal Garg
RAS effector signaling instead of being simple, unidirectional and linear cascade, is actually recognized as highly complex and dynamic signaling network. RAF-MEK-ERK cascade, being at the center of complex signaling network, links to multiple scaffold proteins through feed forward and feedback mechanisms and dynamically regulate tumor initiation and progression. Three isoforms of Ras harbor mutations in a cell and tissue specific manner. Besides mutations, their epigenetic silencing also attributes them to exhibit oncogenic activities...
January 12, 2018: Journal of Cell Communication and Signaling
https://www.readbyqxmd.com/read/29330620/impact-of-sirtuin-1-expression-on-h3k56-acetylation-and-oxidative-stress-a-double-blind-randomized-controlled-trial-with-resveratrol-supplementation
#19
Simona Bo, Gabriele Togliatto, Roberto Gambino, Valentina Ponzo, Giusy Lombardo, Rosalba Rosato, Maurizio Cassader, Maria Felice Brizzi
AIMS: Sirtuin-1 (SIRT-1) down-regulation in type 2 diabetes mellitus (T2DM) has been associated with epigenetic markers of oxidative stress. We herein aim to evaluate whether an increase in SIRT-1 expression affects histone 3 acetylation at the 56 lysine residue (H3K56ac) in T2DM patients randomly selected to receive either resveratrol (40 mg or 500 mg) or a placebo for 6 months. The primary outcome is changes in the H3K56ac level by variation in SIRT-1 expression and the secondary outcome is the evidence of association between SIRT-1 level, antioxidant markers (TAS), and metabolic variables...
January 12, 2018: Acta Diabetologica
https://www.readbyqxmd.com/read/29330501/novel-endogenous-simian-retroviral-integrations-in-vero-cells-implications-for-quality-control-of-a-human-vaccine-cell-substrate
#20
Chisato Sakuma, Tsuyoshi Sekizuka, Makoto Kuroda, Fumio Kasai, Kyoko Saito, Masaki Ikeda, Toshiyuki Yamaji, Naoki Osada, Kentaro Hanada
African green monkey (AGM)-derived Vero cells have been utilized to produce various human vaccines. The Vero cell genome harbors a variety of simian endogenous type D retrovirus (SERV) sequences. In this study, a transcriptome analysis showed that DNA hypomethylation released the epigenetic repression of SERVs in Vero cells. Moreover, comparative genomic analysis of three Vero cell sublines and an AGM reference revealed that the genomes of the sublines have ~80 SERV integrations. Among them, ~60 integrations are present within all three cell sublines and absent from the reference sequence...
January 12, 2018: Scientific Reports
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