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https://www.readbyqxmd.com/read/27911363/generation-of-induced-pluripotent-stem-cells-from-human-melanoma-tumor-infiltrating-lymphocytes
#1
Hidehito Saito, Kumiko Iwabuchi, Noemi Fusaki, Fumito Ito
Adoptive transfer of ex vivo expanded autologous tumor-infiltrating lymphocytes (TILs) can mediate durable and complete responses in significant subsets of patients with metastatic melanoma. Major obstacles of this approach are the reduced viability of transferred T cells, caused by telomere shortening, and the limited number of TILs obtained from patients. Less-differentiated T cells with long telomeres would be an ideal T cell subset for adoptive T cell therapy;however, generating large numbers of these less-differentiated T cells is problematic...
November 11, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27911222/the-histone-methyltransferases-set5-and-set1-have-overlapping-functions-in-gene-silencing-and-telomere-maintenance
#2
Meagan Jezek, Alison Gast, Grace Choi, Rushmie Kulkarni, Jeremiah Quijote, Andrew Graham-Yooll, DoHwan Park, Erin M Green
Genes adjacent to telomeres are subject to transcriptional repression mediated by an integrated set of chromatin modifying and remodeling factors. The telomeres of Saccharomyces cerevisiae have served as a model for dissecting the function of diverse chromatin proteins in gene silencing, and their study has revealed overlapping roles for many chromatin proteins in either promoting or antagonizing gene repression. The H3K4 methyltransferase Set1, which is commonly linked to transcriptional activation, has been implicated in telomere silencing...
December 2, 2016: Epigenetics: Official Journal of the DNA Methylation Society
https://www.readbyqxmd.com/read/27910025/cytogenetics-for-biological-dosimetry
#3
Michelle Ricoul, Tamizh Gnana-Sekaran, Laure Piqueret-Stephan, Laure Sabatier
Cytogenetics is the gold-standard in biological dosimetry for assessing a received dose of ionizing radiation. More modern techniques have recently emerged, but none are as specific as cytogenetic approaches, particularly the dicentric assay. Here, we will focus on the principal cytogenetic techniques used for biological dosimetry: the dicentric assay in metaphase cells, the micronuclei assay in binucleated cells, and the premature condensed chromosome (PCC) assay in interphase cells. New fluorescence in situ hybridization (FISH) techniques (such as telomere-centromere hybridization) have facilitated the analysis of the dicentric assay and have permitted to assess the dose a long time after irradiation by translocation analysis (such as by Tri-color FISH or Multiplex-FISH)...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27905873/comparative-genomics-of-beauveria-bassiana-uncovering-signatures-of-virulence-against-mosquitoes
#4
Claudio A Valero-Jiménez, Luigi Faino, Daphne Spring In't Veld, Sandra Smit, Bas J Zwaan, Jan A L van Kan
BACKGROUND: Entomopathogenic fungi such as Beauveria bassiana are promising biological agents for control of malaria mosquitoes. Indeed, infection with B. bassiana reduces the lifespan of mosquitoes in the laboratory and in the field. Natural isolates of B. bassiana show up to 10-fold differences in virulence between the most and the least virulent isolate. In this study, we sequenced the genomes of five isolates representing the extremes of low/high virulence and three RNA libraries, and applied a genome comparison approach to uncover genetic mechanisms underpinning virulence...
December 1, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27905522/circulating-cell-free-dna-telomere-length-and-bilirubin-in-the-vienna-active-ageing-study-exploratory-analysis-of-a-randomized-controlled-trial
#5
Anela Tosevska, Bernhard Franzke, Marlene Hofmann, Immina Vierheilig, Barbara Schober-Halper, Stefan Oesen, Oliver Neubauer, Barbara Wessner, Karl-Heinz Wagner
Telomere length (TL) in blood cells is widely used in human studies as a molecular marker of ageing. Circulating cell-free DNA (cfDNA) as well as unconjugated bilirubin (UCB) are dynamic blood constituents whose involvement in age-associated diseases is largely unexplored. To our knowledge, there are no published studies integrating all three parameters, especially in individuals of advanced age. Here we present a secondary analysis from the Vienna Active Aging Study (VAAS), a randomized controlled intervention trial in institutionalized elderly individuals (n = 101)...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27904106/fatal-hemorrhagic-gastrointestinal-angioectasia-after-bone-marrow-transplantation-for-dyskeratosis-congenita
#6
Jin Imai, Takayoshi Suzuki, Marie Yoshikawa, Makiko Dekiden, Hirohiko Nakae, Fumio Nakahara, Shingo Tsuda, Hajime Mizukami, Jun Koike, Muneki Igarashi, Hiromasa Yabe, Tetsuya Mine
Dyskeratosis congenita (DC) is a rare inherited disease in which the telomere complex cannot be maintained. Shortened telomeres can cause a number of clinical conditions. We herein report a case of unrelated bone marrow transplantation due to aplastic anemia associated with DC. The patient died of uncontrollable refractory intestinal bleeding. Three cases of DC with life-threatening hemorrhaging after transplantation have been reported; however, the bleeding origin could not be determined. Our case is the only patient in which a gastrointestinal bleeding point, jejunal multiple angioectasia, was determined...
2016: Internal Medicine
https://www.readbyqxmd.com/read/27904002/diffuse-mesangial-sclerosis-in-a-child-with-dyskeratosis-congenita-leading-to-end-stage-renal-disease
#7
Abidi Kamel, Taha Sayari, Manel Jellouli, Yousra Hammi, Rim Ghoucha Louzir, Tahar Gargah
Dyskeratosis congenita (DC) is a very rare inherited disorder. It is caused by dysfunction of telomere maintenance. It involves RNA telomerase components relevant to various mutations leading to a classic triad of physical findings consisting of nail dystrophy of the hands and feet, mucosal leukoplakia, and reticular pigmentation of the skin, most commonly on the head, neck, and trunk. Bone marrow failure along with pulmonary complications and malignancies are all common causes of premature death in patients with DC as well as other abnormalities...
November 2016: Iranian Journal of Kidney Diseases
https://www.readbyqxmd.com/read/27903914/proteomic-analysis-of-the-human-keops-complex-identifies-c14orf142-as-a-core-subunit-homologous-to-yeast-gon7
#8
Leo C K Wan, Pierre Maisonneuve, Rachel K Szilard, Jean-Philippe Lambert, Timothy F Ng, Noah Manczyk, Hao Huang, Rob Laister, Amy A Caudy, Anne-Claude Gingras, Daniel Durocher, Frank Sicheri
The KEOPS/EKC complex is a tRNA modification complex involved in the biosynthesis of N(6)-threonylcarbamoyladenosine (t(6)A), a universally conserved tRNA modification found on ANN-codon recognizing tRNAs. In archaea and eukaryotes, KEOPS is composed of OSGEP/Kae1, PRPK/Bud32, TPRKB/Cgi121 and LAGE3/Pcc1. In fungi, KEOPS contains an additional subunit, Gon7, whose orthologs outside of fungi, if existent, remain unidentified. In addition to displaying defective t(6)A biosynthesis, Saccharomyces cerevisiae strains harboring KEOPS mutations are compromised for telomere homeostasis, growth and transcriptional co-activation...
November 29, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27903905/human-mlh1-suppresses-the-insertion-of-telomeric-sequences-at-intra-chromosomal-sites-in-telomerase-expressing-cells
#9
Pingping Jia, Megan Chastain, Ying Zou, Chengtao Her, Weihang Chai
Aberrant formation of interstitial telomeric sequences (ITSs) promotes genome instabilities. However, it is unclear how aberrant ITS formation is suppressed in human cells. Here, we report that MLH1, a key protein involved in mismatch repair (MMR), suppresses telomeric sequence insertion (TSI) at intra-chromosomal regions. The frequency of TSI can be elevated by double-strand break (DSB) inducer and abolished by ATM/ATR inhibition. Suppression of TSI requires MLH1 recruitment to DSBs, indicating that MLH1's role in DSB response/repair is important for suppressing TSI...
November 29, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27903687/shall-we-call-them-telomere-mediated-renaming-the-idiopathic-after-the-cause-is-found
#10
EDITORIAL
Samantha J Merck, Mary Armanios
No abstract text is available yet for this article.
December 2016: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/27902754/how-do-growth-and-sibling-competition-affect-telomere-dynamics-in-the-first-month-of-life-of-long-lived-seabird
#11
Yuichi Mizutani, Yasuaki Niizuma, Ken Yoda
Telomeres are nucleotide sequences located at the ends of chromosomes that promote genome stability. Changes in telomere length (dynamics) are related to fitness or life expectancy, and telomere dynamics during the development phase are likely to be affected by growth and stress factors. Here, we examined telomere dynamics of black-tailed gull chicks (Larus crassirostris) in nests with and without siblings. We found that the initial telomere lengths of singletons at hatching were longer than those of siblings, indicating that singletons are higher-quality chicks than siblings in terms of telomere length...
2016: PloS One
https://www.readbyqxmd.com/read/27900472/tissue-specific-expression-of-telomerase-reverse-transcriptase-gene-variants-in-nicotiana-tabacum
#12
Jana Fišerová Jurečková, Eva Sýkorová, Said Hafidh, David Honys, Jiří Fajkus, Miloslava Fojtová
In tobacco, three sequence variants of the TERT gene have been described. We revealed unbalanced levels of TERT variant transcripts in vegetative tobacco tissues and enhanced TERT transcription and telomerase activity in reproductive tissues. Telomerase is a ribonucleoprotein complex responsible for the maintenance of telomeres, structures delimiting ends of linear eukaryotic chromosomes. In the Nicotiana tabacum (tobacco) allotetraploid plant, three sequence variants (paralogs) of the gene coding for the telomerase reverse transcriptase subunit (TERT) have been described, two of them derived from the maternal N...
November 29, 2016: Planta
https://www.readbyqxmd.com/read/27899638/structure-and-folding-of-the-tetrahymena-telomerase-rna-pseudoknot
#13
Darian D Cash, Juli Feigon
Telomerase maintains telomere length at the ends of linear chromosomes using an integral telomerase RNA (TER) and telomerase reverse transcriptase (TERT). An essential part of TER is the template/pseudoknot domain (t/PK) which includes the template, for adding telomeric repeats, template boundary element (TBE), and pseudoknot, enclosed in a circle by stem 1. The Tetrahymena telomerase holoenzyme catalytic core (p65-TER-TERT) was recently modeled in our 9 Å resolution cryo-electron microscopy map by fitting protein and TER domains, including a solution NMR structure of the Tetrahymena pseudoknot...
November 29, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27899264/cyclic-ferrocenylnaphthalene-diimide-derivative-as-a-new-class-of-g-quadruplex-dna-binding-ligand
#14
Md Monirul Islam, Shinobu Sato, Shingo Shinozaki, Shigeori Takenaka
To identify an effective ligand that binds to a G-quadruplex structure but not a double-stranded DNA (dsDNA), a set of biophysical and biochemical experiments were carried out using newly synthesized cyclic ferrocenylnaphthalene diimide (cFNDI, 1) or the non-cyclic derivative (2) with various structures of G-quadruplex DNAs and dsDNA. Compound 1 bound strongly to G-quadruplexes DNAs (10(6)M(-1) order) with diminished binding to dsDNA (10(4)M(-1) order) in 100mM AcOH-AcOK buffer (pH 5.5) containing 100mM KCl...
November 15, 2016: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27899034/ionizing-radiation-sensitivity-of-the-ocular-lens-and-its-dose-rate-dependence
#15
Nobuyuki Hamada
PURPOSE: In 2011, the International Commission on Radiological Protection reduced the threshold for the lens effects of low linear energy transfer (LET) radiation. On one hand, the revised threshold of 0.5 Gy is much lower than previously recommended thresholds, but mechanisms behind high radiosensitivity remain incompletely understood. On the other hand, such threshold is independent of dose rate, in contrast to previously recommended separate thresholds each for single and fractionated/protracted exposures...
November 30, 2016: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/27898678/leukocyte-telomere-length-in-relation-to-17-biomarkers-of-cardiovascular-disease-risk-a-cross-sectional-study-of-us-adults
#16
David H Rehkopf, Belinda L Needham, Jue Lin, Elizabeth H Blackburn, Ami R Zota, Janet M Wojcicki, Elissa S Epel
BACKGROUND: Leukocyte telomere length (LTL) is a putative biological marker of immune system age, and there are demonstrated associations between LTL and cardiovascular disease. This may be due in part to the relationship of LTL with other biomarkers associated with cardiovascular disease risk. However, the strength of associations between LTL and adiposity, metabolic, proinflammatory, and cardiovascular biomarkers has not been systematically evaluated in a United States nationally representative population...
November 2016: PLoS Medicine
https://www.readbyqxmd.com/read/27898051/preparation-of-6-8-11-amino-chloro-oxoisoaporphine-and-group-10-metal-complexes-and-evaluation-of-their-in-vitro-and-in-vivo-antitumor-activity
#17
Qi-Pin Qin, Jiao-Lan Qin, Ting Meng, Gui-Ai Yang, Zu-Zhuang Wei, Yan-Cheng Liu, Hong Liang, Zhen-Feng Chen
A series of group-10 metal complexes 1-14 of oxoisoaporphine derivatives were designed and synthesized. 1-14 were more selectively cytotoxic to Hep-G2 cells comparing with normal liver cells. In vitro cytotoxicity results showed that complexes 1-6, 7, 8, 10 and 11, especially 3, were telomerase inhibitors targeting c-myc, telomeric, and bcl-2 G4s and triggered cell senescence and apoptosis; they also caused telomere/DNA damage and S phase arrest. In addition, 1-6 also caused mitochondrial dysfunction. Notably, 3 with 6-amino substituted ligand L(a) exhibited less side effects than 6 with 8-amino substituted ligand L(b) and cisplatin, but similar tumor growth inhibition efficacy in BEL-7402 xenograft model...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27896432/repression-of-telomere-associated-genes-by-microglia-activation-in-neuropsychiatric-disease
#18
Golo Kronenberg, Ria Uhlemann, Johanna Schöner, Stephanie Wegner, Valérie Boujon, Nikolas Deigendesch, Matthias Endres, Karen Gertz
Microglia senescence may promote neuropsychiatric disease. This prompted us to examine the relationship between microglia activation states and telomere biology. A panel of candidate genes associated with telomere maintenance, mitochondrial biogenesis, and cell-cycle regulation were investigated in M1- and M2-polarized microglia in vitro as well as in MACS-purified CD11b+ microglia/brain macrophages from models of stroke, Alzheimer's disease, and chronic stress. M1 polarization, ischemia, and Alzheimer pathology elicited a strikingly similar transcriptomic profile with, in particular, reduced expression of murine Tert...
November 28, 2016: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/27895115/shared-subunits-of-tetrahymena-telomerase-holoenzyme-and-replication-protein-a-have-different-functions-in-different-cellular-complexes
#19
Heather E Upton, Henry Chan, Juli Feigon, Kathleen Collins
In most eukaryotes, telomere maintenance relies on telomeric repeat synthesis by a reverse transcriptase named telomerase. To synthesize telomeric repeats, the catalytic subunit telomerase reverse transcriptase (TERT) uses the RNA subunit (TER) as a template. In the ciliate Tetrahymena thermophila,the telomerase holoenzyme consists of TER, TERT, and eight additional proteins including the telomeric-repeat single-stranded DNA binding protein Teb1 and its heterotrimer partners Teb2 and Teb3. Teb1 is paralogous to the large subunit of the general single-stranded DNA binding heterotrimer Replication Protein A (RPA)...
November 28, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27893208/enterolactone-reduces-telomerase-activity-and-levels-of-its-catalytic-subunit-in-breast-cancer-cells
#20
Davod Ilbeigi, Mitra Nourbakhsh, Shahnaz Khaghani, Nahid Einollahi, Nejat kheiripour, Zafar Gholinejad, Mohammad Alaee, Mostafa saberian
Background: Dietary consumption of phytoestrogens including lignans are linked to a lower incidence of breast cancer. Since activation of telomerase is crucial for growth of cancer cells, the aim of this study was to examine the effect of enterolactone (ENL) and enterodiol (END) on this enzyme. Methods: MTT assays were performed to determine the effect of different concentrations of ENL and ENL on cell viability and to determine the effective concentrations of these two compounds for inhibition of cell growth...
January 10, 2016: Asian Pacific Journal of Cancer Prevention: APJCP
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