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Epigenetic Age

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https://www.readbyqxmd.com/read/29244109/gadd45a-promotes-active-dna-demethylation-of-the-mmp-9-promoter-via-base-excision-repair-pathway-in-ages-treated-keratinocytes-and-in-diabetic-male-rat-skin
#1
Liyan Zhou, Wei Wang, Chuan Yang, Tingting Zeng, Mengdie Hu, Xiaoyi Wang, Na Li, Kan Sun, Chuan Wang, Jing Zhou, Meng Ren, Li Yan
Diabetes elevates matrix metalloproteinase-9 (MMP-9) levels in the skin and its keratinocytes, and activated MMP-9 impairs skin wound healing. Epigenetic regulation of the DNA methylation status within the MMP-9 promoter plays an important role in the alteration of MMP-9 expression. Our aim was to investigate the role and mechanism of growth arrest and DNA damage-inducible 45a (GADD45a), a well-known DNA demethylation regulatory protein that mediates DNA methylation, in the regulation of MMP-9 expression. In this study, we showed that GADD45a was markedly upregulated in skin tissues from patients with diabetic foot ulcers, in diabetic rats and in human keratinocyte (HaCaT) cells exposed to advanced glycation end products (AGEs)...
December 13, 2017: Endocrinology
https://www.readbyqxmd.com/read/29240761/microorganisms-in-the-human-placenta-are-associated-with-altered-cpg-methylation-of-immune-and-inflammation-related-genes
#2
Martha Scott Tomlinson, Paige A Bommarito, Elizabeth M Martin, Lisa Smeester, Raina N Fichorova, Andrew B Onderdonk, Karl C K Kuban, T Michael O'Shea, Rebecca C Fry
Microorganisms in the placenta have been linked to adverse pregnancy outcomes as well as neonatal illness. Inflammation in the placenta has been identified as a contributing factor in this association, but the underlying biological mechanisms are not yet fully understood. The placental epigenome may serve as an intermediate between placental microbes and inflammation, contributing to adverse outcomes in the offspring. In the present study, genome-wide DNA methylation (n = 486,428 CpG sites) of 84 placentas was analyzed in relation to 16 species of placental microorganisms using samples collected from the Extremely Low Gestation Age Newborns (ELGAN) cohort...
2017: PloS One
https://www.readbyqxmd.com/read/29239313/regulation-of-neuronal-survival-by-dna-methyltransferases
#3
REVIEW
Judit Symmank, Geraldine Zimmer
The limited regenerative capacity of neuronal cells requires tight orchestration of cell death and survival regulation in the context of longevity, age-associated diseases as well as during the development of the nervous system. Subordinate to genetic networks epigenetic mechanisms like DNA methylation and histone modifications are involved in the regulation of neuronal development, function and aging. DNA methylation by DNA methyltransferases (DNMTs), mostly correlated with gene silencing, is a dynamic and reversible process...
November 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/29237550/the-effects-of-dna-methylation-on-human-psychology
#4
REVIEW
Farzeen Kader, Meenu Ghai, Leah Maharaj
DNA methylation is a fundamental epigenetic modification in the human genome; pivotal in development, genomic imprinting, X inactivation, chromosome stability, gene expression and methylation aberrations are involved in an array of human diseases. Methylation at promoters is associated with transcriptional repression, whereas gene body methylation is generally associated with gene expression. Extrinsic factors such as age, diets and lifestyle affect DNA methylation which consequently alters gene expression...
December 10, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/29237055/the-epigenetic-control-of-transposable-elements-and-imprinted-genes-in-newborns-is-affected-by-the-mode-of-conception-art-versus-spontaneous-conception-without-underlying-infertility
#5
C Choux, C Binquet, V Carmignac, C Bruno, C Chapusot, J Barberet, M Lamotte, P Sagot, D Bourc'his, P Fauque
STUDY QUESTION: Do assisted reproductive technologies alter DNA methylation and/or transcription of transposable elements and imprinted genes in cord blood and placenta? SUMMARY ANSWER: After ART, DNA methylation and/or transcription changes of some transposable elements and imprinted genes were found in placenta samples while transcription modifications for some transposable elements were also discovered in cord blood. WHAT IS KNOWN ALREADY: Recent studies have confirmed the increased risk of placenta-related adverse pregnancy outcomes and the excess of imprinted disorders with abnormal methylation patterns after ART, which raises the issue of a potential ART-induced epigenetic risk...
December 11, 2017: Human Reproduction
https://www.readbyqxmd.com/read/29235933/faster-ticking-rate-of-the-epigenetic-clock-is-associated-with-faster-pubertal-development-in-girls
#6
Alexandra M Binder, Camila Corvalan, Verónica Mericq, Ana Pereira, José Luis Santos, Steve Horvath, John Shepherd, Karin B Michels
Epigenetic age is an indicator of biological aging, capturing the impact of environmental and behavioral influences across time on cellular function. Deviance between epigenetic age and chronological age (AgeAccel) is a predictor of health. Pubertal timing has similarly been associated with cancer risk and mortality rate among females. We examined the association between AgeAccel and pubertal timing and adolescent breast composition in the longitudinal Growth and Obesity Cohort Study. AgeAccel was estimated in whole blood using the Horvath method at breast Tanner 2 (B2) and 4 (B4)...
December 13, 2017: Epigenetics: Official Journal of the DNA Methylation Society
https://www.readbyqxmd.com/read/29234300/temporal-discrimination-mechanisms-and-relevance-to-adult-onset-dystonia
#7
REVIEW
Antonella Conte, Eavan M McGovern, Shruti Narasimham, Rebecca Beck, Owen Killian, Sean O'Riordan, Richard B Reilly, Michael Hutchinson
Temporal discrimination is the ability to determine that two sequential sensory stimuli are separated in time. For any individual, the temporal discrimination threshold (TDT) is the minimum interval at which paired sequential stimuli are perceived as being asynchronous; this can be assessed, with high test-retest and inter-rater reliability, using a simple psychophysical test. Temporal discrimination is disordered in a number of basal ganglia diseases including adult-onset dystonia, of which the two most common phenotypes are cervical dystonia and blepharospasm...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29234279/long-term-effects-of-intermittent-adolescent-alcohol-exposure-in-male-and-female-rats
#8
Eva M Marco, Sara Peñasco, María-Donina Hernández, Anabel Gil, Erika Borcel, Marta Moya, Elena Giné, José Antonio López-Moreno, Consuelo Guerri, Meritxell López-Gallardo, Fernando Rodríguez de Fonseca
Alcohol is a serious public health concern that has a differential impact on individuals depending upon age and sex. Patterns of alcohol consumption have recently changed: heavy episodic drinking-known as binge-drinking-has become most popular among the youth. Herein, we aimed to investigate the consequences of intermittent adolescent alcohol consumption in male and female animals. Thus, Wistar rats were given free access to ethanol (20% in drinking water) or tap water for 2-h sessions during 3 days, and for an additional 4-h session on the 4th day; every week during adolescence, from postnatal day (pnd) 28-52...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29233643/trichostatin-a-inhibits-deacetylation-of-histone-h3-and-p53-by-sirt6
#9
Marci Wood, Stacia Rymarchyk, Song Zheng, Yana Cen
SIRT6 is an epigenetic modification enzyme that regulates gene transcription through its deacetylase activity. In addition to histone protein, SIRT6 also modify other proteins and enzymes, some of which are central players in metabolic reprogramming and aging process. Therefore, SIRT6 has emerged as a therapeutic target for the treatment of metabolic disorder and age-related diseases. Here, we report that SIRT6 deacetylates lysine 382 of p53 in short synthetic peptide sequence and in full length p53. Further studies showed that the deacetylation of H3K9Ac and p53K382Ac are insensitive to nicotinamide inhibition, but are sensitive to trichostatin A (TSA) inhibition...
December 9, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29230998/-research-progress-on-the-detection-method-of-dna-methylation-and-its-application-in-forensic-science
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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