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https://www.readbyqxmd.com/read/28440422/variable-terra-abundance-and-stability-in-cervical-cancer-cells
#1
Bong-Kyeong Oh, Ponnarath Keo, Jaeman Bae, Jung Hwa Ko, Joong Sub Choi
Telomeres are transcribed into long non-coding RNA, referred to as telomeric repeat-containing RNA (TERRA), which plays important roles in maintaining telomere integrity and heterochromatin formation. TERRA has been well characterized in HeLa cells, a type of cervical cancer cell. However, TERRA abundance and stability have not been examined in other cervical cancer cells, at least to the best of our knowledge. Thus, in this study, we measured TERRA levels and stability, as well as telomere length in 6 cervical cancer cell lines, HeLa, SiHa, CaSki, HeLa S3, C-33A and SNU-17...
April 20, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28425525/exploiting-hydrogen-bonding-interactions-to-probe-smaller-linear-and-cyclic-diamines-binding-to-g-quadruplexes-a-dft-and-molecular-dynamics-study
#2
Mrinal Kanti Si, Anik Sen, Bishwajit Ganguly
G-quadruplexes are formed by the association of four guanine bases through Hoogsteen hydrogen bonding in guanine-rich sequences of DNA and exist in the telomere as well as in promoter regions of certain oncogenes. The sequences of G-quadruplex-DNA are targets for the design of molecules that can bind and can be developed as anti-cancer drugs. The linear and cyclic protonated diamines have been explored to bind to G-quadruplex-DNA through hydrogen bonding interactions. The quadruplex-DNA binders exploit π-stacking and hydrogen bonding interactions with the phosphate backbone of loops and grooves...
April 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28423121/telomere-length-analysis-in-monoclonal-b-cell-lymphocytosis-and-chronic-lymphocytic-leukemia-binet-a
#3
F M Furtado, P S Scheucher, B A Santana, N F Scatena, R T Calado, E M Rego, D M Matos, R P Falcão
Monoclonal B-cell lymphocytosis (MBL) is an asymptomatic clinical entity characterized by the proliferation of monoclonal B cells not meeting the diagnosis criteria for chronic lymphocytic leukemia (CLL). MBL may precede the development of CLL, but the molecular mechanisms responsible for disease progression and evolution are not completely known. Telomeres are usually short in CLL and their attrition may contribute to disease evolution. Here, we determined the telomere lengths of CD5+CD19+ cells in MBL, CLL, and healthy volunteers...
April 13, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28418400/short-telomere-length-is-associated-with-impaired-cognitive-performance-in-european-ancestry-cohorts
#4
S Hägg, Y Zhan, R Karlsson, L Gerritsen, A Ploner, S J van der Lee, L Broer, J Deelen, R E Marioni, A Wong, A Lundquist, G Zhu, N K Hansell, E Sillanpää, I O Fedko, N A Amin, M Beekman, A J M de Craen, S Degerman, S E Harris, K-J Kan, C M Martin-Ruiz, G W Montgomery, A N Adolfsson, C A Reynolds, N J Samani, H E D Suchiman, A Viljanen, T von Zglinicki, M J Wright, J-J Hottenga, D I Boomsma, T Rantanen, J A Kaprio, D R Nyholt, N G Martin, L Nyberg, R Adolfsson, D Kuh, J M Starr, I J Deary, P E Slagboom, C M van Duijn, V Codd, N L Pedersen
The association between telomere length (TL) dynamics on cognitive performance over the life-course is not well understood. This study meta-analyses observational and causal associations between TL and six cognitive traits, with stratifications on APOE genotype, in a Mendelian Randomization (MR) framework. Twelve European cohorts (N=17 052; mean age=59.2±8.8 years) provided results for associations between qPCR-measured TL (T/S-ratio scale) and general cognitive function, mini-mental state exam (MMSE), processing speed by digit symbol substitution test (DSST), visuospatial functioning, memory and executive functioning (STROOP)...
April 18, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28412741/opposite-effects-of-gcn5-and-pcaf-knockdowns-on-the-alternative-mechanism-of-telomere-maintenance
#5
Maya Jeitany, Dalal Bakhos-Douaihy, David C Silvestre, Jose R Pineda, Nicolas Ugolin, Angela Moussa, Laurent R Gauthier, Didier Busso, Marie-Pierre Junier, Hervé Chneiweiss, Sylvie Chevillard, Chantal Desmaze, François D Boussin
Cancer cells can use a telomerase-independent mechanism, known as alternative lengthening of telomeres (ALT), to elongate their telomeres. General control non-derepressible 5 (GCN5) and P300/CBP-associated factor (PCAF) are two homologous acetyltransferases that are mutually exclusive subunits in SAGA-like complexes. Here, we reveal that down regulation of GCN5 and PCAF had differential effects on some phenotypic characteristics of ALT cells. Our results suggest that GCN5 is present at telomeres and opposes telomere recombination, in contrast to PCAF that may indirectly favour them in ALT cells...
February 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/28399136/high-density-mapping-and-haplotype-analysis-of-the-major-stem-solidness-locus-sst1-in-durum-and-common-wheat
#6
Kirby T Nilsen, Amidou N'Diaye, P R MacLachlan, John M Clarke, Yuefeng Ruan, Richard D Cuthbert, Ron E Knox, Krystalee Wiebe, Aron T Cory, Sean Walkowiak, Brian L Beres, Robert J Graf, Fran R Clarke, Andrew G Sharpe, Assaf Distelfeld, Curtis J Pozniak
Breeding for solid-stemmed durum (Triticum turgidum L. var durum) and common wheat (Triticum aestivum L.) cultivars is one strategy to minimize yield losses caused by the wheat stem sawfly (Cephus cinctus Norton). Major stem-solidness QTL have been localized to the long arm of chromosome 3B in both wheat species, but it is unclear if these QTL span a common genetic interval. In this study, we have improved the resolution of the QTL on chromosome 3B in a durum (Kofa/W9262-260D3) and common wheat (Lillian/Vesper) mapping population...
2017: PloS One
https://www.readbyqxmd.com/read/28398700/differential-requirements-for-dna-repair-proteins-in-immortalized-cell-lines-using-alternative-lengthening-of-telomere-mechanisms
#7
Alaina R Martinez, Zeenia Kaul, Jeffrey D Parvin, Joanna Groden
Cancer cells require telomere maintenance to enable uncontrolled growth. Most often telomerase is activated, although a subset of human cancers are telomerase-negative and depend on recombination-based mechanisms known as ALT (Alternative Lengthening of Telomeres). ALT depends on proteins that are essential for homologous recombination, including BLM and the MRN complex, to extend telomeres. This study surveyed the requirement for requisite homologous recombination proteins, yet to be studied in human ALT cell lines, by protein depletion using RNA interference...
April 11, 2017: Genes, Chromosomes & Cancer
https://www.readbyqxmd.com/read/28397798/telomere-length-in-newborns-is-related-to-maternal-stress-during-pregnancy
#8
T Send, M Gilles, V Codd, I A C Wolf, S Bardtke, F Streit, J Strohmaier, J Frank, D Schendel, M W Sütterlin, M Denniff, M Laucht, N J Samani, M Deuschle, M Rietschel, S H Witt
Telomere length (TL) is a marker of biological aging, and numerous studies have shown associations between TL and somatic or psychiatric disorders. Research also indicates an association between maternal stress during pregnancy and TL in the offspring. The present study investigated possible associations between TL and: (1) maternal perceived stress during pregnancy; (2) a maternal life-time history of psychiatric disorder (life-time PD); and (3) paternal age. TL was analysed in 319 newborns and 318 mothers from a predominantly Caucasian sample (n=273 Caucasian newborns and n=274 Causasian mothers)...
April 11, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28394764/telomeres-and-the-natural-lifespan-limit-in-humans
#9
Troels Steenstrup, Jeremy D Kark, Simon Verhulst, Mikael Thinggaard, Jacob V B Hjelmborg, Christine Dalgård, Kirsten Ohm Kyvik, Lene Christiansen, Massimo Mangino, Timothy D Spector, Inge Petersen, Masayuki Kimura, Athanase Benetos, Carlos Labat, Ronit Sinnreich, Shih-Jen Hwang, Daniel Levy, Steven C Hunt, Annette L Fitzpatrick, Wei Chen, Gerald S Berenson, Michelangela Barbieri, Giuseppe Paolisso, Shahinaz M Gadalla, Sharon A Savage, Kaare Christensen, Anatoliy I Yashin, Konstantin G Arbeev, Abraham Aviv
An ongoing debate in demography has focused on whether the human lifespan has a maximal natural limit. Taking a mechanistic perspective, and knowing that short telomeres are associated with diminished longevity, we examined whether telomere length dynamics during adult life could set a maximal natural lifespan limit. We define leukocyte telomere length of 5 kb as the 'telomeric brink', which denotes a high risk of imminent death. We show that a subset of adults may reach the telomeric brink within the current life expectancy and more so for a 100-year life expectancy...
April 6, 2017: Aging
https://www.readbyqxmd.com/read/28384193/metabolically-healthy-obese-women-have-longer-telomere-length-than-obese-women-with-metabolic-syndrome
#10
Andrea E Iglesias Molli, Julieta Panero, Patricia C Dos Santos, Claudio D González, Jorge Vilariño, Marta Sereday, Gloria E Cerrone, Irma Slavutsky, Gustavo D Frechtel
INTRODUCTION: Obesity is the principal component in the Metabolic Syndrome (MetS) that determines the progression of metabolic complications. Metabolically healthy obese (MHO) individuals seem to be protected against those complications. Telomere length (TL) as a novel marker of cellular aging had a complex relationship to the MetS. The principal aim of this study was to investigate the TL in MHO, and to study the association between TL and the worsening of the metabolic condition. MATERIAL AND METHODS: We have determined the absolute TL (aTL) in 400 women (mean age of 46...
2017: PloS One
https://www.readbyqxmd.com/read/28380289/posttraumatic-stress-disorder-and-accelerated-aging-ptsd-and-leukocyte-telomere-length-in-a-sample-of-civilian-women
#11
Andrea L Roberts, Karestan C Koenen, Qixuan Chen, Paola Gilsanz, Susan M Mason, Jennifer Prescott, Andrew Ratanatharathorn, Eric B Rimm, Jennifer A Sumner, Ashley Winning, Immaculata De Vivo, Laura D Kubzansky
BACKGROUND: Studies in male combat veterans have suggested posttraumatic stress disorder (PTSD) is associated with shorter telomere length (TL). We examined the cross-sectional association of PTSD with TL in women exposed to traumas common in civilian life. METHODS: Data are from a substudy of the Nurses' Health Study II (N = 116). PTSD and subclinical PTSD were assessed in trauma-exposed women using diagnostic interviews. An array of health behaviors and conditions were assessed...
April 5, 2017: Depression and Anxiety
https://www.readbyqxmd.com/read/28376371/synthesis-and-the-interaction-of-2-1h-pyrazol-4-yl-1h-imidazo-4-5-f-1-10-phenanthrolines-with-telomeric-dna-as-lung-cancer-inhibitors
#12
Jiachun Liu, Mei Chen, Yanli Wang, Xiaoyin Zhao, Sijia Wang, Yanling Wu, Wen Zhang
A novel series of 2-(1H-pyrazol-4-yl)-1H-imidazo[4,5-f][1,10]phenanthrolines were designed, synthesized and evaluated for their antitumor activity against lung adenocarcinoma by CCK-8 assay, electrophoretic mobility shift assay (EMSA), UV-melting study, wound healing assay and docking study. These compounds showed good inhibitory activities against lung adenocarcinoma. Especially compound 12c exhibited potential antiproliferative activity against A549 cell line with the half maximal inhibitory concentration (IC50) value of 1...
March 18, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28375735/single-molecule-studies-of-telomeres-and-telomerase
#13
Joseph W Parks, Michael D Stone
Telomeres are specialized chromatin structures that protect chromosome ends from dangerous processing events. In most tissues, telomeres shorten with each round of cell division, placing a finite limit on cell growth. In rapidly dividing cells, including the majority of human cancers, cells bypass this growth limit through telomerase-catalyzed maintenance of telomere length. The dynamic properties of telomeres and telomerase render them difficult to study using ensemble biochemical and structural techniques...
March 22, 2017: Annual Review of Biophysics
https://www.readbyqxmd.com/read/28373169/telomere-length-and-neighborhood-circumstances-evaluating-biological-response-to-unfavorable-exposures
#14
EDITORIAL
Shannon M Lynch, Nandita Mitra, Krithika Ravichandran, Jonathan Mitchell, Elaine Spangler, Wenting Zhou, Electra D Paskett, Sarah Gehlert, Cecilia DeGraffinreid, Raymond Stowe, Tamara Dubowitz, Harold Riethman, Charles C Branas, M K Peek, Timothy R Rebbeck
Background: Multilevel frameworks suggest neighborhood circumstances influence biology; however, this relationship is not well studied. Telomere length (TL) shortening has been associated with individual-level and neighborhood-level exposures and disease and may provide insights into underlying biologic mechanisms linking neighborhood with biology. To support neighborhood-biology investigations, we sought to determine the independent effect of neighborhood exposures on TL using standard multilevel linear regression models and quantile regression, a nonlinear, social science method applicable for testing the biologic hypothesis that extremes of the TL distribution are related to poor outcomes...
April 2017: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28369584/clustered-abasic-lesions-profoundly-change-the-structure-and-stability-of-human-telomeric-g-quadruplexes
#15
Iva Kejnovská, Klára Bednárová, Daniel Renciuk, Zuzana Dvoráková, Petra Školáková, Lukáš Trantírek, Radovan Fiala, Michaela Vorlícková, Janos Sagi
Ionizing radiation produces clustered damage to DNA which is difficult to repair and thus more harmful than single lesions. Clustered lesions have only been investigated in dsDNA models. Introducing the term 'clustered damage to G-quadruplexes' we report here on the structural effects of multiple tetrahydrofuranyl abasic sites replacing loop adenines (A/AP) and tetrad guanines (G/AP) in quadruplexes formed by the human telomere d[AG3(TTAG3)3] (htel-22) and d[TAG3(TTAG3)3TT] (htel-25) in K+ solutions. Single to triple A/APs increased the population of parallel strands in their structures by stabilizing propeller type loops, shifting the antiparallel htel-22 into hybrid or parallel quadruplexes...
March 22, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28362624/erratum-telomere-length-long-term-black-carbon-exposure-and-cognitive-function-in-a-cohort-of-older-men-the-va-normative-aging-study
#16
Elena Colicino, Ander Wilson, Maria Chiara Frisardi, Diddier Prada, Melinda C Power, Mirjam Hoxha, Laura Dioni, Avron Spiro, Pantel S Vokonas, Marc G Weisskopf, Joel D Schwartz, Andrea A Baccarelli
No abstract text is available yet for this article.
March 31, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28362374/a-g-quadruplex-dna-affinity-approach-for-purification-of-enzymatically-active-g4-resolvase1
#17
Eric D Routh, Steven D Creacy, Peter E Beerbower, Steven A Akman, James P Vaughn, Philip J Smaldino
Higher-order nucleic acid structures called G-quadruplexes (G4s, G4 structures) can form in guanine-rich regions of both DNA and RNA and are highly thermally stable. There are >375,000 putative G4-forming sequences in the human genome, and they are enriched in promoter regions, untranslated regions (UTRs), and within the telomeric repeat. Due to the potential for these structures to affect cellular processes, such as replication and transcription, the cell has evolved enzymes to manage them. One such enzyme is G4 Resolvase 1 (G4R1), which was biochemically co-characterized by our laboratory and Nagamine et al...
March 18, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28348385/depression-telomeres-and-mitochondrial-dna-between-and-within-person-associations-from-a-10-year-longitudinal-study
#18
J E Verhoeven, D Révész, M Picard, E E Epel, O M Wolkowitz, K A Matthews, B W J H Penninx, E Puterman
Alterations in cellular aging, indexed by leukocyte telomere length (LTL) and mitochondrial DNA copy number (mtDNAcn), might partly account for the increased health risks in persons with depression. Although some studies indeed found cross-sectional associations of depression with LTL and mtDNAcn, the longitudinal associations remain unclear. This 10-year longitudinal study examined between- and within-person associations of depressive symptoms with LTL and mtDNAcn in a large community sample. Data are from years 15, 20 and 25 follow-up evaluations in 977 subjects from the Coronary Artery Risk Development in Young Adults study...
March 28, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28347991/patients-with-gout-have-short-telomeres-compared-with-healthy-participants-association-of-telomere-length-with-flare-frequency-and-cardiovascular-disease-in-gout
#19
N Vazirpanah, L B E Kienhorst, E Van Lochem, C Wichers, M Rossato, P G Shiels, N Dalbeth, L K Stamp, T R Merriman, M Janssen, T R D J Radstake, J Ca Broen
AIM AND BACKGROUND: Chronic inflammation associates with increased senescence, which is a strong predictor for cardiovascular disease. We hypothesised that inflammation accelerates senescence and thereby enhances the risk of cardiovascular disease in gout. METHODS: We assessed replicative senescence by quantifying telomere length (TL) in a discovery cohort of 145 Dutch patients with gout and 273 healthy individuals and validated our results in 474 patients with gout and 293 healthy participants from New Zealand...
March 27, 2017: Annals of the Rheumatic Diseases
https://www.readbyqxmd.com/read/28334827/yeast-hrq1-shares-structural-and-functional-homology-with-the-disease-linked-human-recq4-helicase
#20
Cody M Rogers, Joseph Che-Yen Wang, Hiroki Noguchi, Tsuyoshi Imasaki, Yuichiro Takagi, Matthew L Bochman
The five human RecQ helicases participate in multiple processes required to maintain genome integrity. Of these, the disease-linked RecQ4 is the least studied because it poses many technical challenges. We previously demonstrated that the yeast Hrq1 helicase displays similar functions to RecQ4 in vivo, and here, we report the biochemical and structural characterization of these enzymes. In vitro, Hrq1 and RecQ4 are DNA-stimulated ATPases and robust helicases. Further, these activities were sensitive to DNA sequence and structure, with the helicases preferentially unwinding D-loops...
February 25, 2017: Nucleic Acids Research
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