Assessing the Epigenetic Status of Human Telomeres
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Functional Characterization of the TERRA Transcriptome at Damaged Telomeres
ARTICLE Received 16 Apr 2014 | Accepted 25 Sep 2014 | Published 31 Oct 2014 DOI: 10.1038/ncomms6379 Functional characterization of the TERRA transcriptome at damaged telomeres Antonio Porro1,2,w, Sascha Feuerhahn1,2,*,w, Julien Delafontaine1,3,*, Harold Riethman4, Jacques Rougemont1,3 & Joachim Lingner1,2 Telomere deprotection occurs during tumorigenesis and aging upon telomere shortening or loss of the telomeric shelterin component TRF2. Deprotected telomeres undergo changes in chromatin structure and elicit a DNA damage response (DDR) that leads to cellular senescence. The telomeric long noncoding RNA TERRA has been implicated in modulating the structure and processing of deprotected telomeres. Here, we characterize the human TERRA transcriptome at normal and TRF2-depleted telomeres and demonstrate that TERRA upregulation is occurring upon depletion of TRF2 at all transcribed telomeres. TRF2 represses TERRA transcription through its homodimerization domain, which was previously shown to induce chromatin compaction and to prevent the early steps of DDR activation. We show that TERRA associates with SUV39H1 H3K9 histone methyltransferase, which promotes accumulation of H3K9me3 at damaged telomeres and end-to-end fusions. Altogether our data elucidate the TERRA landscape and defines critical roles for this RNA in the telomeric DNA damage response. 1 Ecole Polytechnique Fe´de´rale de Lausanne (EPFL), School of Life Sciences, 1015 Lausanne, Switzerland. 2 Swiss Institute for Experimental Cancer Research (ISREC) at EPFL, Station 19, CH-1015 Lausanne, Switzerland. 3 Bioinformatics and Biostatistics Core Facility, EPFL and Swiss Institute of Bioinformatics, Station 15, CH-1015 Lausanne, Switzerland. 4 The Wistar Institute, 3601 Spruce Street, Philadelphia, Pennsylvania 19104, USA. * These authors contributed equally to this work. -
Histone Modifications of H3k4me3, H3k9me3 and Lineage Gene Expressions in Chimeric Mouse Embryo
Original Article Histone Modifications of H3K4me3, H3K9me3 and Lineage Gene Expressions in Chimeric Mouse Embryo Maryam Salimi, Ph.D.1, Abolfazl Shirazi, Ph.D.2, 3*, Mohsen Norouzian, Ph.D.1*, Mohammad Mehdi Mehrazar, M.Sc.2, Mohammad Mehdi Naderi, Ph.D.2, Mohammad Ali Shokrgozar, Ph.D.4, Mirdavood Omrani, Ph.D.5, Seyed Mahmoud Hashemi, Ph.D.6 1. Department of Biology and Anatomical Sciences, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran 2. Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran 3. Department of Gametes and Cloning, Research Institute of Animal Embryo Technology, Shahrekord University, Shahrekord, Iran 4. National Cell Bank of Iran, Pasteur Institute of Iran, Tehran, Iran 5. Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran 6. Department of Immunology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran *Corresponding Addresses: P.O.Box: 19615/1177, Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran P.O.Box: 1985717-443, Department of Biology and Anatomical Sciences, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran Emails: [email protected], [email protected] Received: 4/October/2018, Accepted: 18/February/2019 Abstract Objective: Chimeric animal exhibits less viability and more fetal and placental abnormalities than normal animal. This study was aimed to determine the impact of mouse embryonic stem cells (mESCs) injection into the mouse embryos on H3K9me3 and H3K4me3 and cell lineage gene expressions in chimeric blastocysts. Materials and Methods: In our experiment, at the first step, incorporation of the GFP positive mESCs (GFP-mESCs) 129/Sv into the inner cell mass (ICM) of pre-compacted and compacted morula stage embryos was compared. -
Simultaneous Epigenetic Perturbation and Genome Imaging Reveal Distinct Roles of H3k9me3 in Chromatin Architecture and Transcription
University of Massachusetts Medical School eScholarship@UMMS Open Access Publications by UMMS Authors 2020-12-08 Simultaneous epigenetic perturbation and genome imaging reveal distinct roles of H3K9me3 in chromatin architecture and transcription Ying Feng East China University of Science and Technology Et al. Let us know how access to this document benefits ou.y Follow this and additional works at: https://escholarship.umassmed.edu/oapubs Part of the Amino Acids, Peptides, and Proteins Commons, Genetics and Genomics Commons, and the Structural Biology Commons Repository Citation Feng Y, Wang Y, Wang X, He X, Yang C, Naseri A, Pederson T, Zheng J, Zhang S, Xiao X, Xie W, Ma H. (2020). Simultaneous epigenetic perturbation and genome imaging reveal distinct roles of H3K9me3 in chromatin architecture and transcription. Open Access Publications by UMMS Authors. https://doi.org/ 10.1186/s13059-020-02201-1. Retrieved from https://escholarship.umassmed.edu/oapubs/4502 Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 License. This material is brought to you by eScholarship@UMMS. It has been accepted for inclusion in Open Access Publications by UMMS Authors by an authorized administrator of eScholarship@UMMS. For more information, please contact [email protected]. Feng et al. Genome Biology (2020) 21:296 https://doi.org/10.1186/s13059-020-02201-1 RESEARCH Open Access Simultaneous epigenetic perturbation and genome imaging reveal distinct roles of H3K9me3 in chromatin architecture and transcription Ying Feng1†, Yao Wang2,3†, Xiangnan Wang4, Xiaohui He4, Chen Yang5, Ardalan Naseri6, Thoru Pederson7, Jing Zheng5, Shaojie Zhang6, Xiao Xiao8, Wei Xie2,3* and Hanhui Ma4* * Correspondence: xiewei121@ tsinghua.edu.cn; mahh@ Abstract shanghaitech.edu.cn †Ying Feng and Yao Wang Introduction: Despite the long-observed correlation between H3K9me3, chromatin contributed equally to this work. -
Telomeres in ICF Syndrome Cells Are Vulnerable to DNA Damage Due to Elevated DNA:RNA Hybrids
ARTICLE Received 14 Jul 2016 | Accepted 21 Nov 2016 | Published 24 Jan 2017 DOI: 10.1038/ncomms14015 OPEN Telomeres in ICF syndrome cells are vulnerable to DNA damage due to elevated DNA:RNA hybrids Shira Sagie1, Shir Toubiana1,*, Stella R. Hartono2,*, Hagar Katzir1, Aya Tzur-Gilat1, Shany Havazelet1, Claire Francastel3, Guillaume Velasco3,Fre´de´ric Che´din2 & Sara Selig1 DNA:RNA hybrids, nucleic acid structures with diverse physiological functions, can disrupt genome integrity when dysregulated. Human telomeres were shown to form hybrids with the lncRNA TERRA, yet the formation and distribution of these hybrids among telomeres, their regulation and their cellular effects remain elusive. Here we predict and confirm in several human cell types that DNA:RNA hybrids form at many subtelomeric and telomeric regions. We demonstrate that ICF syndrome cells, which exhibit short telomeres and elevated TERRA levels, are enriched for hybrids at telomeric regions throughout the cell cycle. Telomeric hybrids are associated with high levels of DNA damage at chromosome ends in ICF cells, which are significantly reduced with overexpression of RNase H1. Our findings suggest that abnormally high TERRA levels in ICF syndrome lead to accumulation of telomeric hybrids that, in turn, can result in telomeric dysfunction. 1 Molecular Medicine Laboratory, Rambam Health Care Campus and Rappaport Faculty of Medicine, Technion, Haifa 31096, Israel. 2 Department of Molecular and Cellular Biology and Genome Center, University of California, Davis, California 95616, USA. 3 Universite´ Paris Diderot, Sorbonne Paris Cite´, Epigenetics and Cell Fate, CNRS UMR7216, Paris Cedex 75205, France. * These authors contributed equally to this work. Correspondence and requests for materials should be addressed to S. -
A Practical Qpcr Approach to Detect TERRA, the Elusive Telomeric Repeat-Containing RNA ⇑ Marianna Feretzaki, Joachim Lingner
Methods xxx (2016) xxx–xxx Contents lists available at ScienceDirect Methods journal homepage: www.elsevier.com/locate/ymeth A practical qPCR approach to detect TERRA, the elusive telomeric repeat-containing RNA ⇑ Marianna Feretzaki, Joachim Lingner Swiss Institute for Experimental Cancer Research (ISREC), School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland article info abstract Article history: Telomeres, the heterochromatic structures that protect the ends of the chromosomes, are transcribed into Received 27 May 2016 a class of long non-coding RNAs, telomeric repeat-containing RNAs (TERRA), whose transcriptional reg- Received in revised form 1 August 2016 ulation and functions are not well understood. The identification of TERRA adds a novel level of structural Accepted 7 August 2016 and functional complexity at telomeres, opening up a new field of research. TERRA molecules are Available online xxxx expressed at several chromosome ends with transcription starting from the subtelomeric DNA proceed- ing into the telomeric tracts. TERRA is heterogeneous in length and its expression is regulated during the Keywords: cell cycle and upon telomere damage. Little is known about the mechanisms of regulation at the level of Telomeres transcription and post transcription by RNA stability. Furthermore, it remains to be determined to what Subtelomeres TERRA extent the regulation at different chromosome ends may differ. We present an overview on the method- Transcriptional regulation ology of how RT-qPCR and primer pairs that are specific for different subtelomeric sequences can be used qRT-PCR to detect and quantify TERRA expressed from different chromosome ends. Ó 2016 Published by Elsevier Inc. -
Expression and Differential Regulation of Human TERRA at Several Chromosome Ends
Downloaded from rnajournal.cshlp.org on September 25, 2021 - Published by Cold Spring Harbor Laboratory Press Expression and differential regulation of human TERRA at several chromosome ends Marianna Feretzaki,1,2 Patricia Renck Nunes,1,2 and Joachim Lingner1 1 Swiss Institute for Experimental Cancer Research (ISREC), School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland 2 Equal contribution *Corresponding author: [email protected] Running head: TERRA expression from several chromosome ends Keywords: TERRA, long noncoding RNA, telomeres, telomere length Feretzaki 1 Downloaded from rnajournal.cshlp.org on September 25, 2021 - Published by Cold Spring Harbor Laboratory Press ABSTRACT The telomeric long noncoding RNA TERRA has been implicated in regulating telomere maintenance by telomerase and homologous recombination, and in influencing telomeric protein composition during the cell cycle and the telomeric DNA damage response. TERRA transcription starts at subtelomeric regions resembling the CpG islands of eukaryotic genes extending towards chromosome ends. TERRA contains chromosome specific subtelomeric sequences at its 5’ end and long tracts of UUAGGG-repeats towards the 3’ end. Conflicting studies have been published to whether TERRA is expressed from one or several chromosome ends. Here, we quantify TERRA species by RT-qPCR in normal and several cancerous human cell lines. By using chromosome specific subtelomeric DNA primers we demonstrate that TERRA is expressed from a large number of telomeres. Deficiency in DNA methyltransferases leads to TERRA upregulation only at the subset of chromosome ends that contain CpG-island sequences revealing differential regulation of TERRA promoters by DNA methylation. However, independently of the differences in TERRA expression, short telomeres were uniformly present in a DNA methyltransferase deficient cell line indicating that telomere length was not dictated by TERRA expression in cis. -
Deciphering the Histone Code to Build the Genome Structure
bioRxiv preprint doi: https://doi.org/10.1101/217190; this version posted November 20, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC 4.0 International license. Deciphering the histone code to build the genome structure Kirti Prakasha,b,c,* and David Fournierd,* aPhysico-Chimie Curie, Institut Curie, CNRS UMR 168, 75005 Paris, France; bOxford Nanoimaging Ltd, OX1 1JD, Oxford, UK; cMicron Advanced Bioimaging Unit, Department of Biochemistry, University of Oxford, Oxford, UK; dFaculty of Biology and Center for Computational Sciences, Johannes Gutenberg University Mainz, 55128 Mainz, Germany; *Correspondence: [email protected], [email protected] Histones are punctuated with small chemical modifications that alter their interaction with DNA. One attractive hypothesis stipulates that certain combinations of these histone modifications may function, alone or together, as a part of a predictive histone code to provide ground rules for chromatin folding. We consider four features that relate histone modifications to chromatin folding: charge neutrali- sation, molecular specificity, robustness and evolvability. Next, we present evidence for the association among different histone modi- fications at various levels of chromatin organisation and show how these relationships relate to function such as transcription, replica- tion and cell division. Finally, we propose a model where the histone code can set critical checkpoints for chromatin to fold reversibly be- tween different orders of the organisation in response to a biological stimulus. DNA | nucleosomes | histone modifications | chromatin domains | chro- mosomes | histone code | chromatin folding | genome structure Introduction The genetic information within chromosomes of eukaryotes is packaged into chromatin, a long and folded polymer of double-stranded DNA, histones and other structural and non- structural proteins. -
Heterochromatin: Guardian of the Genome
CB34CH08_Karpen ARI 16 July 2018 12:50 Annual Review of Cell and Developmental Biology Heterochromatin: Guardian of the Genome Aniek Janssen,1,2,∗ Serafin U. Colmenares,1,2,∗ and Gary H. Karpen1,2 1Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA; email: [email protected] 2Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA Annu. Rev. Cell Dev. Biol. 2018. 34:8.1–8.24 Keywords The Annual Review of Cell and Developmental constitutive heterochromatin, pericentromeres, genome stability, Biology is online at cellbio.annualreviews.org chromosome segregation, repetitive DNA, DNA repair https://doi.org/10.1146/annurev-cellbio-100617- 062653 Abstract Copyright c 2018 by Annual Reviews. Constitutive heterochromatin is a major component of the eukaryotic nu- All rights reserved cleus and is essential for the maintenance of genome stability. Highly concen- ∗ These authors contributed equally. trated at pericentromeric and telomeric domains, heterochromatin is riddled with repetitive sequences and has evolved specific ways to compartmentalize, Annu. Rev. Cell Dev. Biol. 2018.34. Downloaded from www.annualreviews.org silence, and repair repeats. The delicate balance between heterochromatin Access provided by University of California - Berkeley on 09/14/18. For personal use only. epigenetic maintenance and cellular processes such as mitosis and DNA re- pair and replication reveals a highly dynamic and plastic chromatin domain that can be perturbed by multiple mechanisms, with far-reaching conse- quences for genome integrity. Indeed, heterochromatin dysfunction pro- vokes genetic turmoil by inducing aberrant repeat repair, chromosome- segregation errors, transposon activation, and replication stress and is strongly implicated in aging and tumorigenesis. -
Dynamics of Transcription-Dependent H3k36me3 Marking by the SETD2:IWS1:SPT6 Ternary Complex
bioRxiv preprint doi: https://doi.org/10.1101/636084; this version posted May 14, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Dynamics of transcription-dependent H3K36me3 marking by the SETD2:IWS1:SPT6 ternary complex Katerina Cermakova1, Eric A. Smith1, Vaclav Veverka2, H. Courtney Hodges1,3,4,* 1 Department of Molecular & Cellular Biology, Center for Precision Environmental Health, and Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX, 77030, USA 2 Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Prague, Czech Republic 3 Center for Cancer Epigenetics, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA 4 Department of Bioengineering, Rice University, Houston, TX, 77005, USA * Lead contact; Correspondence to: [email protected] Abstract The genome-wide distribution of H3K36me3 is maintained SETD2 contributes to gene expression by marking gene through various mechanisms. In human cells, H3K36 is bodies with H3K36me3, which is thought to assist in the mono- and di-methylated by eight distinct histone concentration of transcription machinery at the small portion methyltransferases; however, the predominant writer of the of the coding genome. Despite extensive genome-wide data trimethyl mark on H3K36 is SETD21,11,12. Interestingly, revealing the precise localization of H3K36me3 over gene SETD2 is a major tumor suppressor in clear cell renal cell bodies, the physical basis for the accumulation, carcinoma13, breast cancer14, bladder cancer15, and acute maintenance, and sharp borders of H3K36me3 over these lymphoblastic leukemias16–18. In these settings, mutations sites remains rudimentary. -
Structure Specific Recognition of Telomeric Repeats Containing RNA
4492–4506 Nucleic Acids Research, 2020, Vol. 48, No. 8 Published online 4 March 2020 doi: 10.1093/nar/gkaa134 Structure specific recognition of telomeric repeats containing RNA by the RGG-box of hnRNPA1 Meenakshi Ghosh 1 and Mahavir Singh 1,2,* 1Molecular Biophysics Unit, Indian Institute of Science, Bengaluru, 560012, India and 2NMR Research Centre, Indian Institute of Science, Bengaluru, 560012, India Received April 12, 2019; Revised February 12, 2020; Editorial Decision February 19, 2020; Accepted February 21, 2020 Downloaded from https://academic.oup.com/nar/article/48/8/4492/5780085 by guest on 25 September 2021 ABSTRACT mation, and replication (4,5). TERRA RNA repeats have been found to bind a number of proteins that include telom- The telomere repeats containing RNA (TERRA) is erase reverse transcriptase (hTERT), telomeric repeat bind- transcribed from the C-rich strand of telomere DNA ing factor-2 (TRF2) and heterogenous nuclear ribonucleo- and comprises of UUAGGG nucleotides repeats in protein A1 (hnRNPA1) (6,7). Complexity of TERRA func- humans. The TERRA RNA repeats can exist in single tions also stems from the observation that TERRA re- stranded, RNA-DNA hybrid and G-quadruplex forms peats can exist in single-stranded, RNA-DNA hybrid, and in the cell. Interaction of TERRA RNA with hnRNPA1 RNA G-quadruplex forms in the cell (8). The G-quadruplex has been proposed to play critical roles in mainte- forms can further exist in structures of different topologies nance of telomere DNA. hnRNPA1 contains an N- with intramolecular G-quadruplex being the most physio- terminal UP1 domain followed by an RGG-box con- logically relevant form. -
Molecular Biology - TERRA and Telomere Elongation
DO MY ASSIGNMENT SUBMIT Sample: Molecular Biology - TERRA and Telomere Elongation TERRA expression triggers telomere elongation Abstract Telomeres are the regions at the end of chromosomes that protect them from degradation. Telomeric DNA damage was shown to induce cellular senescence and programmed cell death (apoptosis). Telomere shortening is associated with aging. On the other hand, activity of the enzyme that extends telomeres (telomerase) was found in almost all human tumours. The absence of telomerase activity in most human cells is a necessary condition for maintaining normal tissue homeostasis. For years, telomeres were considered to be transcriptionally silent. That is why the recent finding of telomeric repeat-containing RNA (TERRA) transcribed at chromosome ends stunned the scientific world. It is now shown that TERRA molecules play a crucial role in telomere maintenance and regulation of telomerase activity. Cusanelli et al. suggested that TERRA expression may represent a signal induced by short telomeres to trigger telomerase recruitment and subsequent telomere elongation. Altered expression of TERRA is associated with genome instability, which can lead to cellular malignization or senescence. Since biological functions of TERRA are still unclear, finding out the molecular mechanisms of TERRA biogenesis and functioning will require a significant effort. It will advance our understanding of telomere-related diseases, cancer and aging. Telomeres are the ends of eukaryotic chromosomes, which are associated with proteins to protect the DNA ends from being recognized as double-strand breaks (DSBs). The end replication problem with following processing by exonucleases is the mechanism of telomeres shortening at each cell division. Loss of telomere length below a critical threshold leads to cellular senescence, apoptosis, or genome instability. -
TERRA Transcription Destabilizes Telomere Integrity to Initiate Break
ARTICLE https://doi.org/10.1038/s41467-021-24097-6 OPEN TERRA transcription destabilizes telomere integrity to initiate break-induced replication in human ALT cells ✉ Bruno Silva 1,4, Rajika Arora 1,3,4, Silvia Bione 2 & Claus M. Azzalin 1 Alternative Lengthening of Telomeres (ALT) is a Break-Induced Replication (BIR)-based mechanism elongating telomeres in a subset of human cancer cells. While the notion that 1234567890():,; spontaneous DNA damage at telomeres is required to initiate ALT, the molecular triggers of this physiological telomere instability are largely unknown. We previously proposed that the telomeric long noncoding RNA TERRA may represent one such trigger; however, given the lack of tools to suppress TERRA transcription in cells, our hypothesis remained speculative. We have developed Transcription Activator-Like Effectors able to rapidly inhibit TERRA transcription from multiple chromosome ends in an ALT cell line. TERRA transcription inhi- bition decreases marks of DNA replication stress and DNA damage at telomeres and impairs ALT activity and telomere length maintenance. We conclude that TERRA transcription actively destabilizes telomere integrity in ALT cells, thereby triggering BIR and promoting telomere elongation. Our data point to TERRA transcription manipulation as a potentially useful target for therapy. 1 Instituto de Medicina Molecular João Lobo Antunes (iMM), Faculdade de Medicina da Universidade de Lisboa, Lisbon, Portugal. 2 Computational Biology Unit, Institute of Molecular Genetics Luigi Luca Cavalli-Sforza,