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Epigenetics and aging

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https://www.readbyqxmd.com/read/29230998/-research-progress-on-the-detection-method-of-dna-methylation-and-its-application-in-forensic-science
#1
REVIEW
Y C Nie, L J Yu, H Guan, Y Zhao, H B Rong, B W Jiang, T Zhang
As an important part of epigenetic marker, DNA methylation involves in the gene regulation and attracts a wide spread attention in biological auxology, geratology and oncology fields. In forensic science, because of the relative stable, heritable, abundant, and age-related characteristics, DNA methylation is considered to be a useful complement to the classic genetic markers for age-prediction, tissue-identification, and monozygotic twins' discrimination. Various methods for DNA methylation detection have been validated based on methylation sensitive restriction endonuclease, bisulfite modification and methylation-CpG binding protein...
June 2017: Fa Yi Xue za Zhi
https://www.readbyqxmd.com/read/29230532/rna-mediated-transgenerational-inheritance-in-ciliates-and-plants
#2
REVIEW
Zachary T Neeb, Mariusz Nowacki
In the age of next-generation sequencing (NGS) and with the availability of whole sequenced genomes and epigenomes, some attention has shifted from purely sequence-based studies to those of heritable epigenetic modifications. Transgenerational inheritance can be defined as heritable changes to the state of DNA that may be passed on to subsequent generations without alterations to the underlying DNA sequence. Although this phenomenon has been extensively studied in many systems, studies of transgenerational inheritance in mammals and other higher-level eukaryotes may be complicated by the fact that many epigenetic marks are reprogrammed during sexual reproduction...
December 11, 2017: Chromosoma
https://www.readbyqxmd.com/read/29227276/alteration-in-the-cytokine-secretion-pattern-in-t-cells-of-patients-with-cystic-fibrosis-caused-by-dna-methyltransferase-inhibitor-5-azacitidine
#3
E Kvaratskhelia, N Dabrundashvili, M Gagua, E Maisuradze, M Kamkamidze, E Abzianidze
Cystic fibrosis (CF) is the autosomal-recessive disorder caused by mutation in the cystic fibrosis transmembrane conductance regulator gene (CFTR). The Airway inflammation plays a central role in the progression of CF disease. Cystic fibrosis characterized by the overproduction of the pro-inflammatory cytokines and reduced expression of anti-inflammatory cytokines. Although the mechanisms of abnormal cytokine expression is still poorly understood, altered epigenetic regulations in T cells might contribute. In the present study we examined the expression of IFN-γ and IL-10 by CF T cells prior to and following 5-azaC treatment...
November 2017: Georgian Medical News
https://www.readbyqxmd.com/read/29225347/accelerated-epigenetic-aging-and-mitochondrial-dna-copy-number-in-bipolar-disorder
#4
Gabriel R Fries, Isabelle E Bauer, Giselli Scaini, Mon-Ju Wu, Iram F Kazimi, Samira S Valvassori, Giovana Zunta-Soares, Consuelo Walss-Bass, Jair C Soares, Joao Quevedo
Bipolar disorder (BD) has been previously associated with accelerated aging; yet, the mechanisms underlying this association are largely unknown. The epigenetic clock has been increasingly recognized as a valuable aging marker, although its association with other biological clocks in BD patients and high-risk subjects, such as telomere length and mitochondrial DNA (mtDNA) copy number, has never been investigated. We included 22 patients with BD I, 16 siblings of BD patients, and 20 healthy controls in this analysis...
December 11, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/29223680/dysregulation-of-c-x-c-motif-ligand-10-during-aging-and-association-with-cognitive-performance
#5
Steven Bradburn, Jamie McPhee, Liam Bagley, Michael Carroll, Mark Slevin, Nasser Al-Shanti, Yoann Barnouin, Jean-Yves Hogrel, Mati Pääsuke, Helena Gapeyeva, Andrea Maier, Sarianna Sipilä, Marco Narici, Andrew Robinson, David Mann, Antony Payton, Neil Pendleton, Gillian Butler-Browne, Chris Murgatroyd
Chronic low-grade inflammation during aging (inflammaging) is associated with cognitive decline and neurodegeneration; however, the mechanisms underlying inflammaging are unclear. We studied a population (n = 361) of healthy young and old adults from the MyoAge cohort. Peripheral levels of C-X-C motif chemokine ligand 10 (CXCL10) was found to be higher in older adults, compared with young, and negatively associated with working memory performance. This coincided with an age-related reduction in blood DNA methylation at specific CpGs within the CXCL10 gene promoter...
November 23, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/29221210/the-molecular-classification-of-astrocytic-tumors
#6
Chen-Xue Mao, Ji-Ye Yin, Ying Zhang, Zhi-Bin Wang, Zhi-Quan Yang, Zheng-Wen He, Xiang-Min Li, Xiao-Yuan Mao, Ru-Tao Cui, Xue-Jun Li, Xi Li, Wei Zhang, Hong-Hao Zhou, Zhao-Qian Liu
Aim: This study will explore the genetic and epigenetic alterations in astrocytomas, and identify the critical molecular signatures and signaling pathways for prognosis assessment by multiplatform comprehensive analysis. Method: We performed integration analyses of incorporating DNA methylation, mRNA expression, microRNA expression, and long non-coding RNA (lncRNA) expression in 33 astrocytic tumor tissues and 9 non-tumor brain tissues. Result: We observed that 11,795 DNA methylation sites, 3,627 genes, 136 microRNAs, and 3,334 lncRNAs were significantly differential between tumors and non-tumor brain tissues, and the filtered signatures through comprehensive analysis were significantly enriched in calcium signaling pathway...
November 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29220669/modulation-of-dietary-folate-with-age-confers-selective-hepatocellular-epigenetic-imprints-through-dna-methylation
#7
Rauf Ahmad Najar, Nissar Ahmad Wani, Javeed Ahmad Bhat, Nawab John Dar, Beenish Rahat, Ajai Prakash Gupta, Jaspreet Kaur, Jyotdeep Kaur, Abid Hamid
The present study has been designed to determine the effect of folate modulation (deficiency/supplementation) with aging on the promoter methylation of tumor suppressor and proto-oncogenes to understand the underlying mechanism of epigenetic alterations. Folate deficiency was induced for 3 and 5 months in weanling, young and adult groups, and after 3 months of folate deficiency, they were repleted with physiological folate (2 mg/kg diet) and folate oversupplementation (8 mg/kg diet) for another 2 months. The methylation facet in the present study revealed that the combined effect of folate deficiency and aging decreased the methylation index...
November 2, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/29219199/variable-transcriptional-responsiveness-of-the-p2%C3%A2-%C3%A3-%C3%A2-3-receptor-gene-during-cfa-induced-inflammatory-hyperalgesia
#8
Paulina Nuñez-Badinez, Hugo Sepúlveda, Emilio Diaz, Wolfgang Greffrath, Rolf-Detlef Treede, Jimmy Stehberg, Martin Montecino, Brigitte van Zundert
The purinergic receptor P2 × 3 (P2 × 3-R) plays important roles in molecular pathways of pain, and reduction of its activity or expression effectively reduces chronic inflammatory and neuropathic pain sensation. Inflammation, nerve injury, and cancer-induced pain can increase P2 × 3-R mRNA and/or protein levels in dorsal root ganglia (DRG). However, P2 × 3-R expression is unaltered or even reduced in other pain studies. The reasons for these discrepancies are unknown and might depend on the applied traumatic intervention or on intrinsic factors such as age, gender, genetic background and/or epigenetics...
December 8, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29218006/reduced-levels-of-the-synaptic-functional-regulator-fmrp-in-dentate-gyrus-of-the-aging-sprague-dawley-rat
#9
Roman Smidak, Fernando J Sialana, Martina Kristofova, Tamara Stojanovic, Dragana Rajcic, Jovana Malikovic, Daniel D Feyissa, Volker Korz, Harald Hoeger, Judit Wackerlig, Diana Mechtcheriakova, Gert Lubec
Fragile X mental retardation protein (FMRP) encoded by Fragile X mental retardation 1 (FMR1) gene is a RNA-binding regulator of mRNA translation, transport and stability with multiple targets responsible for proper synaptic function. Epigenetic silencing of FMR1 gene expression leads to the development of Fragile X syndrome (FXS) that is characterized by intellectual disability and other behavioral problems including autism. In the rat FXS model, the lack of FMRP caused a deficit in hippocampal-dependent memory...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29209557/line-1-in-response-to-exposure-to-ionizing-radiation
#10
COMMENT
Igor Koturbash
It is becoming increasingly recognized that Long Interspersed Nuclear Element, 1 (LINE-1), the most ubiquitous repetitive element in the mammalian genomes, plays an important role in the pathogenesis of disease and in the response to exposure to environmental stressors. Ionizing radiation is a known genotoxic stressor, but it is capable of targeting the cellular epigenome as well. Radiation-induced alterations in LINE-1 DNA methylation are the most frequently observed epigenetic effects of exposure. The extent of this aberrant DNA methylation, however, strongly depends on a number of factors, including the type and dose of radiation...
2017: Mobile Genetic Elements
https://www.readbyqxmd.com/read/29207832/a-comparison-of-clinicopathological-differences-in-oral-squamous-cell-carcinoma-in-patients-below-and-above-40-years-of-age
#11
Supriya Nikita Kapila, Srikant Natarajan, Karen Boaz
Introduction: Recent times have revealed an increase in incidence of Oral Squamous Cell Carcinoma (OSCC) in young adults including those who lack association with typical risk factors such as tobacco. There are reported variations in clinical behaviour of tumours in young and older individuals. Aim: Present study evaluated differences in clinicopathological characteristics between two groups of OSCC, below and above 40 years of age. Materials and Methods: An analytical study was performed on two groups of OSCC patients, below and above 40 years of age...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29203780/microrna-expression-in-ethnic-specific-early-stage-breast-cancer-an-integration-and-comparative-analysis
#12
Farah J Nassar, Rabih Talhouk, Nathalie K Zgheib, Arafat Tfayli, Maya El Sabban, Nagi S El Saghir, Fouad Boulos, Mark N Jabbour, Claude Chalala, Rose-Mary Boustany, Humam Kadara, Zhou Zhang, Yinan Zheng, Brian Joyce, Lifang Hou, Ali Bazarbachi, George Calin, Rihab Nasr
Breast cancer (BC) has a higher incidence in young Lebanese woman as compared to the West. We assessed the microRNA (miRNA) microarray profile of tissues derived from Lebanese patients with early BC and performed mRNA-miRNA integration analysis. 173 miRNAs were significantly dysregulated in 45 BC versus 17 normal adjacent breast tissues, including 74 with a fold change more than two of which 17 were never reported before in cancer. Integration analysis of mRNA-miRNA microarray data revealed a potential role of 51 dysregulated miRNA regulating 719 tumor suppressive or oncogenic mRNA associated with increased proliferation and decreased migration and invasion...
December 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29197628/towards-the-application-of-precision-medicine-in-age-related-macular-degeneration
#13
REVIEW
Raffaella Cascella, Claudia Strafella, Valerio Caputo, Valeria Errichiello, Stefania Zampatti, Filippo Milano, Saverio Potenza, Silvestro Mauriello, Giuseppe Novelli, Federico Ricci, Andrea Cusumano, Emiliano Giardina
The review essentially describes genetic and non-genetic variables contributing to the onset and progression of exudative Age-related Macular Degeneration (AMD) in Italian population. In particular, AMD susceptibility within Italian population is contributed to by genetic variants, accounting for 23% of disease and non-genetic variants, accounting for 10% of AMD. Our data highlighted prominent differences concerning genetic and non-genetic contributors to AMD in our cohort with respect to worldwide populations...
November 29, 2017: Progress in Retinal and Eye Research
https://www.readbyqxmd.com/read/29197076/dna-methylation-based-biological-aging-and-cancer-risk-and-survival-pooled-analysis-of-seven-prospective-studies
#14
Pierre-Antoine Dugué, Julie K Bassett, JiHoon E Joo, Chol-Hee Jung, Ee Ming Wong, Margarita Moreno-Betancur, Daniel Schmidt, Enes Makalic, Shuai Li, Gianluca Severi, Allison M Hodge, Daniel D Buchanan, Dallas R English, John L Hopper, Melissa C Southey, Graham G Giles, Roger L Milne
The association between aging and cancer is complex. Recent studies have developed measures of biological aging based on DNA methylation and called them 'age acceleration'. We aimed to assess associations of age acceleration with risk of and survival from seven common cancers. Seven case-control studies of DNA methylation and colorectal, gastric, kidney, lung, prostate and urothelial cancer, and B-cell lymphoma, nested in the Melbourne Collaborative Cohort Study were conducted. Cancer cases, vital status and cause of death were ascertained through linkage with cancer and death registries...
December 2, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/29196523/dna-replication-timing-alterations-identify-common-markers-between-distinct-progeroid-diseases
#15
Juan Carlos Rivera-Mulia, Romain Desprat, Claudia Trevilla-Garcia, Daniela Cornacchia, Hélène Schwerer, Takayo Sasaki, Jiao Sima, Tyler Fells, Lorenz Studer, Jean-Marc Lemaitre, David M Gilbert
Progeroid syndromes are rare genetic disorders that phenotypically resemble natural aging. Different causal mutations have been identified, but no molecular alterations have been identified that are in common to these diseases. DNA replication timing (RT) is a robust cell type-specific epigenetic feature highly conserved in the same cell types from different individuals but altered in disease. Here, we characterized DNA RT program alterations in Hutchinson-Gilford progeria syndrome (HGPS) and Rothmund-Thomson syndrome (RTS) patients compared with natural aging and cellular senescence...
December 1, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29194500/eano-guidelines-for-the-diagnosis-and-treatment-of-ependymal-tumors
#16
Roberta Rudà, Guido Reifenberger, Didier Frappaz, Stefan M Pfister, Anne Laprie, Thomas Santarius, Patrick Roth, Joerg Christian Tonn, Riccardo Soffietti, Michael Weller, Elizabeth Cohen-Jonathan Moyal
Ependymal tumors are rare CNS tumors and may occur at any age, but their proportion among primary brain tumors is highest in children and young adults. Thus, the level of evidence of diagnostic and therapeutic interventions is higher in the pediatric compared with the adult patient population.The diagnosis and disease staging is performed by craniospinal MRI. Tumor classification is achieved by histological and molecular diagnostic assessment of tissue specimens according to the World Health Organization (WHO) classification 2016...
November 29, 2017: Neuro-oncology
https://www.readbyqxmd.com/read/29192413/dysregulation-of-micrornas-in-triple-negative-breast-cancer
#17
Sylwia Paszek, Natalia Gabło, Edyta Barnaś, Małgorzata Szybka, Jan Morawiec, Agnieszka Kołacińska, Izabela Zawlik
OBJECTIVES: Triple-negative breast cancer (TNBC) is an aggressive subtype of breast cancer with limited treatment options and poor prognosis. TNBC is usually diagnosed at a relatively young age and is characterized by high risk of developing metastases. Some epigenetic regulation of gene expression is associated with TNBC. Expression of microRNAs (miRNAs) can serve as a potential tool for identifying critical biomarkers in TNBC. The aim of our study is to examine expression of selected miRNAs in TNBC and to assess the relationship between miRNA expression and clinicopathological factors...
2017: Ginekologia Polska
https://www.readbyqxmd.com/read/29192217/decreased-mirna-expression-in-klinefelter-syndrome
#18
Laura Cimino, Michele Salemi, Rossella Cannarella, Rosita A Condorelli, Giorgio Giurato, Giovanna Marchese, Sandro La Vignera, Aldo E Calogero
The widelyvariable phenotypic spectrum and the different severity of symptoms in men with Klinefelter syndrome (KS) suggest a role for epigenetic mediators. Therefore, the aim of this study is to evaluate the possible involvement of miRNAs in the clinical manifestations of KS. To accomplish this, we performed a transcriptome analysis in peripheral blood mononuclear cells (PBMCs) of 10 non-mosaic KS patients, 10 aged-matched healthy men and 10 aged-matched healthy female controls with normal karyotype. After RNA extraction from PBMC and the preparation of RNA libraries, the samples were sequenced using next generation high-throughput sequencing technology...
November 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29190382/the-epigenetic-clock-and-telomere-length-are-independently-associated-with-chronological-age-and-mortality
#19
Riccardo E Marioni, Sarah E Harris, Sonia Shah, Allan F McRae, Thomas von Zglinicki, Carmen Martin-Ruiz, Naomi R Wray, Peter M Visscher, Ian J Deary
No abstract text is available yet for this article.
November 27, 2017: International Journal of Epidemiology
https://www.readbyqxmd.com/read/29188479/racial-disparity-in-breast-cancer-can-it-be-mattered-for-prognosis-and-therapy
#20
REVIEW
Vijayalaxmi Gupta, Inamul Haque, Jinia Chakraborty, Stephanie Graff, Snigdha Banerjee, Sushanta K Banerjee
Breast cancer (BC) has emerged as a deadly disease that affects the lives of millions of women worldwide. It is the second leading cause of cancer-related deaths in the United States. Advancements in BC screening, preventive measures and treatment have resulted in significant decline in BC related deaths. However, unacceptable levels of racial disparity have been consistently reported, especially in African-American (AA) women compared to European American (EA). AA women go through worse prognosis, shorter survival time and higher mortality rates, despite higher cancer incidence reported in EA...
November 29, 2017: Journal of Cell Communication and Signaling
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