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Epigenetics and aging

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https://www.readbyqxmd.com/read/28211918/myotonic-dystrophy-type-1-patient-derived-ipscs-for-the-investigation-of-ctg-repeat-instability
#1
Junko Ueki, Masayuki Nakamori, Masahiro Nakamura, Misato Nishikawa, Yoshinori Yoshida, Azusa Tanaka, Asuka Morizane, Masayoshi Kamon, Toshiyuki Araki, Masanori P Takahashi, Akira Watanabe, Nobuya Inagaki, Hidetoshi Sakurai
Myotonic dystrophy type 1 (DM1) is an autosomal-dominant multi-system disease caused by expanded CTG repeats in dystrophia myotonica protein kinase (DMPK). The expanded CTG repeats are unstable and can increase the length of the gene with age, which worsens the symptoms. In order to establish a human stem cell system suitable for the investigation of repeat instability, DM1 patient-derived iPSCs were generated and differentiated into three cell types commonly affected in DM1, namely cardiomyocytes, neurons and myocytes...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28210622/epigenetics-and-signaling-pathways-in-glaucoma
#2
REVIEW
Angela C Gauthier, Ji Liu
Glaucoma is the most common cause of irreversible blindness worldwide. This neurodegenerative disease becomes more prevalent with aging, but predisposing genetic and environmental factors also contribute to increased risk. Emerging evidence now suggests that epigenetics may also be involved, which provides potential new therapeutic targets. These three factors work through several pathways, including TGF-β, MAP kinase, Rho kinase, BDNF, JNK, PI-3/Akt, PTEN, Bcl-2, Caspase, and Calcium-Calpain signaling. Together, these pathways result in the upregulation of proapoptotic gene expression, the downregulation of neuroprotective and prosurvival factors, and the generation of fibrosis at the trabecular meshwork, which may block aqueous humor drainage...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28208798/maternal%C3%A2-folic%C3%A2-acid%C3%A2-supplementation%C3%A2-during%C3%A2-pregnancy%C3%A2-and%C3%A2-childhood%C3%A2-allergic%C3%A2-disease%C3%A2-outcomes-%C3%A2-a%C3%A2-question%C3%A2-of%C3%A2-timing
#3
REVIEW
Catrina L McStay, Susan L Prescott, Carol Bower, Debra J Palmer
Since the early 1990s, maternal folic acid supplementation has been recommended prior  to and during the first trimester of pregnancy, to reduce the risk of infant neural tube defects. In  addition, many countries have also implemented the folic acid fortification of staple foods, in order  to promote sufficient intakes amongst women of a childbearing age, based on concerns surrounding  variable dietary and supplementation practices. As many women continue to take folic acid  supplements beyond the recommended first trimester, there has been an overall increase in folate  intakes, particularly in countries with mandatory fortification...
February 9, 2017: Nutrients
https://www.readbyqxmd.com/read/28203683/identification-of-unique-venous-thromboembolism-susceptibility-variants-in-african-americans
#4
John A Heit, Sebastian M Armasu, Bryan M McCauley, Iftikhar J Kullo, Hugues Sicotte, Jyotishman Pathak, Christopher G Chute, Omri Gottesman, Erwin P Bottinger, Joshua C Denny, Dan M Roden, Rongling Li, Marylyn D Ritchie, Mariza de Andrade
To identify novel single nucleotide polymorphisms (SNPs) associated with venous thromboembolism (VTE) in African-Americans (AAs), we performed a genome-wide association study (GWAS) of VTE in AAs using the Electronic Medical Records and Genomics (eMERGE) Network, comprised of seven sites each with DNA biobanks (total ~39,200 unique DNA samples) with genome-wide SNP data (imputed to 1000 Genomes Project cosmopolitan reference panel) and linked to electronic health records (EHRs). Using a validated EHR-driven phenotype extraction algorithm, we identified VTE cases and controls and tested for an association between each SNP and VTE using unconditional logistic regression, adjusted for age, sex, stroke, site-platform combination and sickle cell risk genotype...
February 16, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28202904/genome-wide-dna-de-methylation-is-associated-with-noninfectious-bud-failure-exhibition-in-almond-prunus-dulcis-mill-d-a-webb
#5
Jonathan Fresnedo-Ramírez, Helen M Chan, Dan E Parfitt, Carlos H Crisosto, Thomas M Gradziel
Noninfectious bud-failure (BF) remains a major threat to almond production in California, particularly with the recent rapid expansion of acreage and as more intensive cultural practices and modern cultivars are adopted. BF has been shown to be inherited in both vegetative and sexual progeny, with exhibition related to the age and propagation history of scion clonal sources. These characteristics suggest an epigenetic influence, such as the loss of juvenility mediated by DNA-(de)methylation. Various degrees of BF have been reported among cultivars as well as within sources of clonal propagation of the same cultivar...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28199764/clinical-markers-of-asthma-and-ige-assessed-in-parents-before-conception-predicts-asthma-and-hay-fever-in-the-offspring
#6
Randi J Bertelsen, Marta Rava, Anne Elie Carsin, Simone Accordini, Bryndis Benediktsdóttir, Julia Dratva, Karl A Franklin, Joachim Heinrich, Mathias Holm, Christer Janson, Ane Johannessen, Deborah L Jarvis, Rain Jogi, Benedicte Leynaert, Dan Norback, Ernst Reidar Omenaas, Chantal Raherison, José Luis Sánchez-Ramos, Vivi Schlünssen, Torben Sigsgaard, Shyamali C Dharmage, Cecilie Svanes
BACKGROUND: Mice models suggest epigenetic inheritance induced by parental allergic disease activity. However, we know little of how parental disease activity before conception influences offspring's asthma and allergy in humans. OBJECTIVE: We aimed to assess the associations of parental asthma severity, bronchial hyperresponsiveness (BHR), and total and specific IgEs, measured before conception vs after birth, with offspring asthma and hay fever. METHODS: The study included 4293 participants (mean age 34, 47% men) from the European Community Respiratory Health Survey (ECRHS) with information on asthma symptom severity, BHR, total and specific IgEs from 1991-1993, and data on 9100 offspring born 1972-2012...
February 15, 2017: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28198702/epigenetic-clock-analysis-of-diet-exercise-education-and-lifestyle-factors
#7
Austin Quach, Morgan E Levine, Toshiko Tanaka, Ake T Lu, Brian H Chen, Luigi Ferrucci, Beate Ritz, Stefania Bandinelli, Marian L Neuhouser, Jeannette M Beasley, Linda Snetselaar, Robert B Wallace, Philip S Tsao, Devin Absher, Themistocles L Assimes, James D Stewart, Yun Li, Lifang Hou, Andrea A Baccarelli, Eric A Whitsel, Steve Horvath
Behavioral and lifestyle factors have been shown to relate to a number of health-related outcomes, yet there is a need for studies that examine their relationship to molecular aging rates. Toward this end, we use recent epigenetic biomarkers of age that have previously been shown to predict all-cause mortality, chronic conditions, and age-related functional decline. We analyze cross-sectional data from 4,173 postmenopausal female participants from the Women's Health Initiative, as well as 402 male and female participants from the Italian cohort study, Invecchiare nel Chianti...
February 14, 2017: Aging
https://www.readbyqxmd.com/read/28198392/coffee-consumption-is-associated-with-dna-methylation-levels-of-human-blood
#8
Yu-Hsuan Chuang, Austin Quach, Devin Absher, Themistocles Assimes, Steve Horvath, Beate Ritz
Beneficial health effects have been attributed to coffee consumption, but it is not yet known whether epigenetics may have a role in this process. Here we associate epigenome-wide DNA methylation levels to habitual coffee consumption from two studies with blood (2100 and 215 participants), and one with saliva samples (256 participants). Adjusting for age, gender, and blood cell composition, one CpG (cg21566642 near ALPPL2) surpassed genome-wide significance (P=3.7 × 10(-10)) and from among 10 additional CpGs significant at P≤5...
February 15, 2017: European Journal of Human Genetics: EJHG
https://www.readbyqxmd.com/read/28194238/epigenome-wide-association-study-ewas-on-lipids-the-rotterdam-study
#9
Kim V E Braun, Klodian Dhana, Paul S de Vries, Trudy Voortman, Joyce B J van Meurs, Andre G Uitterlinden, Albert Hofman, Frank B Hu, Oscar H Franco, Abbas Dehghan
BACKGROUND: DNA methylation is a key epigenetic mechanism that is suggested to be associated with blood lipid levels. We aimed to identify CpG sites at which DNA methylation levels are associated with blood levels of triglycerides, high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), and total cholesterol in 725 participants of the Rotterdam Study, a population-based cohort study. Subsequently, we sought replication in a non-overlapping set of 760 participants...
2017: Clinical Epigenetics
https://www.readbyqxmd.com/read/28194204/relationship-between-breastfeeding-factors-and-breast-cancer-in-women-referred-to-seyed-al-shohada-hospital-in-isfahan-iran
#10
Farahnaz Jafari-Mehdiabad, Mitra Savabi-Esfahani, Fariborz Mokaryan, Ashraf Kazemi
BACKGROUND: Breast cancer is the most common malignancy and a major cause of cancer deaths among women. Breastfeeding is presented as a probable protective factor against breast cancer, however, the effect of different breastfeeding patterns and duration of breastfeeding on this factor is not well determined. Thus, the aim of this research was to evaluate factors related to breastfeeding and breast cancer. MATERIALS AND METHODS: This case-control study was conducted on 98 women with breast cancer and 198 healthy women who were selected through systematic random sampling method...
November 2016: Iranian Journal of Nursing and Midwifery Research
https://www.readbyqxmd.com/read/28194114/emerging-molecular-pathways-governing-dietary-regulation-of-neural-stem-cells-during-aging
#11
REVIEW
Chiara de Lucia, Tytus Murphy, Sandrine Thuret
Aging alters cellular and molecular processes, including those of stem cells biology. In particular, changes in neural stem cells (NSCs) are linked to cognitive decline associated with aging. Recently, the systemic environment has been shown to alter both NSCs regulation and age-related cognitive decline. Interestingly, a well-documented and naturally occurring way of altering the composition of the systemic environment is through diet and nutrition. Furthermore, it is well established that the presence of specific nutrients as well as the overall increase or reduction of calorie intake can modulate conserved molecular pathways and respectively reduce or increase lifespan...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28193856/contribution-of-epigenetic-mechanisms-to-variation-in-cancer-risk-among-tissues
#12
Michael Klutstein, Joshua Moss, Tommy Kaplan, Howard Cedar
Recently, it was suggested that tissue variation in cancer risk originates from differences in the number of stem-cell divisions underlying each tissue, leading to different mutation loads. We show that this variation is also correlated with the degree of aberrant CpG island DNA methylation in normal cells. Methylation accumulates during aging in a subset of molecules, suggesting that the epigenetic landscape within a founder-cell population may contribute to tumor formation.
February 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28193703/methylation-in-the-matrix-metalloproteinase-2-gene-is-associated-with-cerebral-ischemic-stroke
#13
Hsiu-Fen Lin, Edward Hsi, Ling-Chun Huang, Yi-Chu Liao, Suh-Hang H Juo, Ruey-Tay Lin
Matrix metalloproteinase-2 (MMP-2) is involved in the pathophysiology of stroke. Previous studies have shown that MMP-2 activity is increased in stroke; however, evidence of epigenetic regulation of the MMP-2 in stroke is still limited. We examined methylation of the MMP-2 promoter in patients with ischemic stroke. This study included 298 patients with ischemic stroke and 258 age-matched and sex-matched controls. MMP-2 promoter methylation levels were measured by pyrosequencing at eight potential cytosine-guanine (CpG) sites...
February 13, 2017: Journal of Investigative Medicine: the Official Publication of the American Federation for Clinical Research
https://www.readbyqxmd.com/read/28192769/disorganization-at-the-stage-of-schizophrenia-clinical-outcome-clinical-biological-study
#14
A Nestsiarovich, V Obyedkov, H Kandratsenka, M Siniauskaya, I Goloenko, N Waszkiewicz
BACKGROUND: According to the multidimensional model of schizophrenia, three basic psychopathological dimensions constitute its clinical structure: positive symptoms, negative symptoms and disorganization. The latter one is the newest and the least studied. Our aim was to discriminate disorganization in schizophrenia clinical picture and to identify its distinctive biological and socio-psychological particularities and associated genetic and environmental factors. METHODS: We used SAPS/SANS psychometrical scales, scales for the assessment of patient's compliance, insight, social functioning, life quality...
December 30, 2016: European Psychiatry: the Journal of the Association of European Psychiatrists
https://www.readbyqxmd.com/read/28192409/melanocyte-transformation-requires-complete-loss-of-all-pocket-protein-function-via-a-mechanism-that-mitigates-the-need-for-mapk-pathway-activation
#15
I D Tonks, P Mukhopadhyay, W A Schroder, A Sorolla, A W Mould, H Y Handoko, B Ferguson, H K Muller, P Keith, N K Hayward, G J Walker, G F Kay
Deregulation of p16INK4A is a critical event in melanoma susceptibility and progression. It is generally assumed that the major effect of loss of p16 function is mediated through the CDK-cyclin pathway via its influence on the pocket protein (PP) pRb. However, there are also two other PPs, p107 and p130, which, when phosphorylated by CDK-cyclin complexes, play a role in permitting cell progression. Cohorts of mice carrying melanocyte-specific knockouts (KOs) of various combinations of the three PPs were generated...
February 13, 2017: Oncogene
https://www.readbyqxmd.com/read/28188812/epigenetics-in-cancer-fundamentals-and-beyond
#16
REVIEW
Subhankar Biswas, C Mallikarjuna Rao
Activation of oncogenes or the deactivation of tumor suppressor genes has long been established as the fundamental mechanism leading towards carcinogenesis. Although this age old axiom is vastly accurate, thorough study over the last 15 years has given us unprecedented information on the involvement of epigenetic in cancer. Various biochemical pathways that are essential towards tumorigenesis are regulated by the epigenetic phenomenons like remodeling of nucleosome by histone modifications, DNA methylation and miRNA mediated targeting of various genes...
February 7, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28186187/factors-associated-with-aberrant-imprint-methylation-and-oligozoospermia
#17
Norio Kobayashi, Naoko Miyauchi, Nozomi Tatsuta, Akane Kitamura, Hiroaki Okae, Hitoshi Hiura, Akiko Sato, Takafumi Utsunomiya, Nobuo Yaegashi, Kunihiko Nakai, Takahiro Arima
Disturbingly, the number of patients with oligozoospermia (low sperm count) has been gradually increasing in industrialized countries. Epigenetic alterations are believed to be involved in this condition. Recent studies have clarified that intrinsic and extrinsic factors can induce epigenetic transgenerational phenotypes through apparent reprogramming of the male germ line. Here we examined DNA methylation levels of 22 human imprinted loci in a total of 221 purified sperm samples from infertile couples and found methylation alterations in 24...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28183455/cardiometabolic-risk-markers-adipocyte-fatty-acid-binding-protein-afabp-and-the-impact-of-high-intensity-interval-training-hiit-in-obese-adolescents
#18
Susann Blüher, Jakob Käpplinger, Sabine Herget, Sandra Reichardt, Yvonne Böttcher, Andrea Grimm, Jürgen Kratzsch, David Petroff
OBJECTIVE: The impact of high-intensity interval training (HIIT) as well as the association between the adipocyte fatty binding protein (aFABP) and cardiometabolic risk factors in overweight adolescents was investigated. METHODS: Twenty-eight adolescents (13-18years; BMI≥90th percentile according to German reference values) were offered HIIT twice weekly for 6months. At baseline and after program completion, anthropometric, clinical and metabolic characteristics were assessed and a fasting blood sample was obtained...
March 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28182018/genome-wide-base-resolution-mapping-of-dna-methylation-in-single-cells-using-single-cell-bisulfite-sequencing-scbs-seq
#19
Stephen J Clark, Sébastien A Smallwood, Heather J Lee, Felix Krueger, Wolf Reik, Gavin Kelsey
DNA methylation (DNAme) is an important epigenetic mark in diverse species. Our current understanding of DNAme is based on measurements from bulk cell samples, which obscures intercellular differences and prevents analyses of rare cell types. Thus, the ability to measure DNAme in single cells has the potential to make important contributions to the understanding of several key biological processes, such as embryonic development, disease progression and aging. We have recently reported a method for generating genome-wide DNAme maps from single cells, using single-cell bisulfite sequencing (scBS-seq), allowing the quantitative measurement of DNAme at up to 50% of CpG dinucleotides throughout the mouse genome...
March 2017: Nature Protocols
https://www.readbyqxmd.com/read/28178655/chl1-hypermethylation-as-a-potential-biomarker-of-poor-prognosis-in-breast-cancer
#20
Esperanza Martín-Sánchez, Saioa Mendaza, Ane Ulazia-Garmendia, Iñaki Monreal-Santesteban, Idoia Blanco-Luquin, Alicia Córdoba, Francisco Vicente-García, Noemí Pérez-Janices, David Escors, Diego Megías, Paula López-Serra, Manel Esteller, José Juan Illarramendi, David Guerrero-Setas
The CHL1 gene encodes a cell-adhesion molecule proposed as being a putative tumour-suppressor gene in breast cancer (BC). However, neither the underlying molecular mechanisms nor the clinical value of CHL1 downregulation in BC has been explored. The methylation status of three CpG sites in the CHL1 promoter was analysed by pyrosequencing in neoplastic biopsies from 142 patients with invasive BC and compared with that of non-neoplastic tissues. We found higher CHL1 methylation levels in breast tumours than in non-neoplastic tissues, either from mammoplasties or adjacent-to-tumour, which correlated with lower levels of protein expression in tumours measured by immunohistochemistry...
February 2, 2017: Oncotarget
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