Characterization of the Long Terminal Repeat of the Endogenous
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Multi-Ancestry Genome-Wide Gene-Sleep Interactions Identify Novel
bioRxiv preprint doi: https://doi.org/10.1101/2020.05.29.123505; this version posted May 31, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.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-ND 4.0 International license. Multi-ancestry genome-wide gene-sleep interactions identify novel loci for blood pressure Heming Wang1,2,*, Raymond Noordam3,* , Brian E Cade1,2,*, Karen Schwander4,*, Thomas W Winkler5,*, Jiwon Lee1,*, Yun Ju Sung4,*, Amy R. Bentley6,*, Alisa K Manning2,7, Hugues Aschard8,9, Tuomas O Kilpeläinen10,11, Marjan Ilkov12, Michael R Brown13, Andrea R Horimoto14, Melissa Richard15, Traci M Bartz16, Dina Vojinovic17,18, Elise Lim19, Jovia L Nierenberg20, Yongmei Liu21, Kumaraswamynaidu Chitrala22, Tuomo Rankinen23, Solomon K Musani24, Nora Franceschini25, Rainer Rauramaa26, Maris Alver27,28, Phyllis Zee29, Sarah E Harris30, Peter J van der Most31, Ilja M Nolte31, Patricia B Munroe32,33, Nicholette D Palmer34, Brigitte Kühnel35,36, Stefan Weiss37,38, Wanqing Wen39, Kelly A Hall40, Leo-Pekka Lyytikäinen41,42, Jeff O'Connell43,44, Gudny Eiriksdottir12, Lenore J Launer22, Paul S de Vries13, Dan E Arking45, Han Chen13,46, Eric Boerwinkle13,47, Jose E Krieger14, Pamela J Schreiner48, Stephen S Sidney49, James M Shikany50, Kenneth Rice51, Yii-Der Ida Chen52, Sina A Gharib53, Joshua C Bis54, Annemarie I Luik17, M Arfan Ikram17,55, André G Uitterlinden17, Najaf Amin17, Hanfei Xu19, Daniel Levy19,56, Jiang He20, Kurt -
Expression of a Mouse Long Terminal Repeat Is Cell Cycle-Linked (Friend Cells/Gene Expression/Retroviruses/Transformation/Onc Genes) LEONARD H
Proc. Natl. Acad. Sci. USA Vol. 82, pp. 1946-1949, April 1985 Biochemistry Expression of a mouse long terminal repeat is cell cycle-linked (Friend cells/gene expression/retroviruses/transformation/onc genes) LEONARD H. AUGENLICHT AND HEIDI HALSEY Department of Oncology, Montefiore Medical Center, and Department of Medicine, Albert Einstein College of Medicine, 111 East 210th St., Bronx, NY 10467 Communicated by Harry Eagle, November 26, 1984 ABSTRACT The expression of the long terminal repeat have regions of homology with a Syrian hamster repetitive (LTR) of intracisternal A particle retroviral sequences which sequence whose expression is also linked to the G, phase of are endogenous to the mouse genome has been shown to be the cell cycle (28). linked to the early G6 phase of the cell cycle in Friend erythroleukemia cells synchronized by density arrest and also MATERIALS AND METHODS in logarithmically growing cells fractionated into cell-cycle Cells. Friend erythroleukemia cells, strain DS-19, were compartments by centrifugal elutriation. Regions of homology grown in minimal essential medium containing 10% fetal calf were found in comparing the LTR sequence to a repetitive serum (28). Cell number was determined by counting an Syrian hamster sequence specifically expressed in early G1 in aliquot in an automated particle counter (Coulter Electron- hamster cells. ics). The cells were fractionated into cell-cycle compart- ments by centrifugal elutriation with a Beckman elutriator The long terminal repeats (LTR) of retroviral genomes rotor as described (29). For analysis of DNA content per contain sequence elements that regulate the transcription of cell, the cells were stained with either 4',6-diamidino-2- the viral genes (1). -
Interfering with Retrotransposition by Two Types of CRISPR Effectors
Zhang et al. Cell Discovery (2020) 6:30 Cell Discovery https://doi.org/10.1038/s41421-020-0164-0 www.nature.com/celldisc ARTICLE Open Access Interfering with retrotransposition by two types of CRISPR effectors: Cas12a and Cas13a Niubing Zhang1,2, Xinyun Jing1, Yuanhua Liu3, Minjie Chen1,2, Xianfeng Zhu2, Jing Jiang2, Hongbing Wang4, Xuan Li1 and Pei Hao3 Abstract CRISPRs are a promising tool being explored in combating exogenous retroviral pathogens and in disabling endogenous retroviruses for organ transplantation. The Cas12a and Cas13a systems offer novel mechanisms of CRISPR actions that have not been evaluated for retrovirus interference. Particularly, a latest study revealed that the activated Cas13a provided bacterial hosts with a “passive protection” mechanism to defend against DNA phage infection by inducing cell growth arrest in infected cells, which is especially significant as it endows Cas13a, a RNA-targeting CRISPR effector, with mount defense against both RNA and DNA invaders. Here, by refitting long terminal repeat retrotransposon Tf1 as a model system, which shares common features with retrovirus regarding their replication mechanism and life cycle, we repurposed CRISPR-Cas12a and -Cas13a to interfere with Tf1 retrotransposition, and evaluated their different mechanisms of action. Cas12a exhibited strong inhibition on retrotransposition, allowing marginal Tf1 transposition that was likely the result of a lasting pool of Tf1 RNA/cDNA intermediates protected within virus-like particles. The residual activities, however, were completely eliminated with new constructs for persistent crRNA targeting. On the other hand, targeting Cas13a to Tf1 RNA intermediates significantly inhibited Tf1 retrotransposition. However, unlike in bacterial hosts, the sustained activation of Cas13a by Tf1 transcripts did not cause cell growth arrest in S. -
RESEARCH ARTICLES Gene Cluster Statistics with Gene Families
RESEARCH ARTICLES Gene Cluster Statistics with Gene Families Narayanan Raghupathy*1 and Dannie Durand* *Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA; and Department of Computer Science, Carnegie Mellon University, Pittsburgh, PA Identifying genomic regions that descended from a common ancestor is important for understanding the function and evolution of genomes. In distantly related genomes, clusters of homologous gene pairs are evidence of candidate homologous regions. Demonstrating the statistical significance of such ‘‘gene clusters’’ is an essential component of comparative genomic analyses. However, currently there are no practical statistical tests for gene clusters that model the influence of the number of homologs in each gene family on cluster significance. In this work, we demonstrate empirically that failure to incorporate gene family size in gene cluster statistics results in overestimation of significance, leading to incorrect conclusions. We further present novel analytical methods for estimating gene cluster significance that take gene family size into account. Our methods do not require complete genome data and are suitable for testing individual clusters found in local regions, such as contigs in an unfinished assembly. We consider pairs of regions drawn from the same genome (paralogous clusters), as well as regions drawn from two different genomes (orthologous clusters). Determining cluster significance under general models of gene family size is computationally intractable. By assuming that all gene families are of equal size, we obtain analytical expressions that allow fast approximation of cluster probabilities. We evaluate the accuracy of this approximation by comparing the resulting gene cluster probabilities with cluster probabilities obtained by simulating a realistic, power-law distributed model of gene family size, with parameters inferred from genomic data. -
Gene-Pseudogene Evolution
Mahmudi et al. BMC Genomics 2015, 16(Suppl 10):S12 http://www.biomedcentral.com/1471-2164/16/S10/S12 RESEARCH Open Access Gene-pseudogene evolution: a probabilistic approach Owais Mahmudi1*, Bengt Sennblad2, Lars Arvestad3, Katja Nowick4, Jens Lagergren1* From 13th Annual Research in Computational Molecular Biology (RECOMB) Satellite Workshop on Comparative Genomics Frankfurt, Germany. 4-7 October 2015 Abstract Over the last decade, methods have been developed for the reconstruction of gene trees that take into account the species tree. Many of these methods have been based on the probabilistic duplication-loss model, which describes how a gene-tree evolves over a species-tree with respect to duplication and losses, as well as extension of this model, e.g., the DLRS (Duplication, Loss, Rate and Sequence evolution) model that also includes sequence evolution under relaxed molecular clock. A disjoint, almost as recent, and very important line of research has been focused on non protein-coding, but yet, functional DNA. For instance, DNA sequences being pseudogenes in the sense that they are not translated, may still be transcribed and the thereby produced RNA may be functional. We extend the DLRS model by including pseudogenization events and devise an MCMC framework for analyzing extended gene families consisting of genes and pseudogenes with respect to this model, i.e., reconstructing gene- trees and identifying pseudogenization events in the reconstructed gene-trees. By applying the MCMC framework to biologically realistic synthetic data, we show that gene-trees as well as pseudogenization points can be inferred well. We also apply our MCMC framework to extended gene families belonging to the Olfactory Receptor and Zinc Finger superfamilies. -
Complete Article
The EMBO Journal Vol. I No. 12 pp. 1539-1544, 1982 Long terminal repeat-like elements flank a human immunoglobulin epsilon pseudogene that lacks introns Shintaro Ueda', Sumiko Nakai, Yasuyoshi Nishida, lack the entire IVS have been found in the gene families of the Hiroshi Hisajima, and Tasuku Honjo* mouse a-globin (Nishioka et al., 1980; Vanin et al., 1980), the lambda chain (Hollis et al., 1982), Department of Genetics, Osaka University Medical School, Osaka 530, human immunoglobulin Japan and the human ,B-tubulin (Wilde et al., 1982a, 1982b). The mouse a-globin processed gene is flanked by long terminal Communicated by K.Rajewsky Received on 30 September 1982 repeats (LTRs) of retrovirus-like intracisternal A particles on both sides, although their orientation is opposite to each There are at least three immunoglobulin epsilon genes (C,1, other (Lueders et al., 1982). The human processed genes CE2, and CE) in the human genome. The nucleotide sequences described above have poly(A)-like tails -20 bases 3' to the of the expressed epsilon gene (CE,) and one (CE) of the two putative poly(A) addition signal and are flanked by direct epsilon pseudogenes were compared. The results show that repeats of several bases on both sides (Hollis et al., 1982; the CE3 gene lacks the three intervening sequences entirely and Wilde et al., 1982a, 1982b). Such direct repeats, which were has a 31-base A-rich sequence 16 bases 3' to the putative also found in human small nuclear RNA pseudogenes poly(A) addition signal, indicating that the CE3 gene is a pro- (Arsdell et al., 1981), might have been formed by repair of cessed gene. -
Growth Inhibition of Retinoic Acid Treated MCF-7 Breast Cancer
Growth Inhibition of Retinoic Acid Treated MCF-7 Breast Cancer Cells-Identification of Sox 9 and Other Proteins T Remsen, P Kessler, A Stern, H Samuels and P Pevsner Dept of Pharmacology New York University School of Medicine, New York, NY, USA [email protected] Background and Significance Despite advances in treatment, breast cancer continues to be the second leading cause of cancer mortality in women. Statistics suggest Sample 1 that while focus on treatment should continue, chemopreventive approaches should also be pursued.1 SRY and SOX9 are involved in Histone 4 (H4) (Swiss prot)Macrophage migration inhibitory factor (MIF) (Swiss prot) both skeletal development and sex determination, 2 and have been shown to be nuclear proteins.3 Human SOX4 is expressed in the nor- Heat Shock protein HSP 90 (Swiss prot) GI 3287489, Hsp89-alpha-delta-N [Homo sapiens] mal breast and in breast cancer cells. Treatment of T-47D breast cancer cells with the synthetic progestin ORG 2058 directly increased 4 GI 31979, histone H2A.2 [Homo sapiens]GI 40254816, heat shock protein 90kDa alpha (cytoso- SOX4 transcription. This caused a 4-fold increase in SOX4 mRNA levels within 4 h of treatment. Retinoids can also reduce expres- lic), class A member 1 isoform 2 [Homo sapiens] 5 sion of the inhibitor of apoptosisprotein, survivin. PDCD4 (programmed cell death 4), a tumor suppressor gene presently being evalu- GI 34039, unnamed protein product [Homo sapiens] ated as a target for chemoprevention, was induced about three-fold by the retinoic acid receptor (RARa)-selective agonist Am580 in GI 31645, glyceraldehyde-3-phosphate dehydrogenase [Homo sapiens] T-47D breast cancer cells. -
Gene Family Amplification Facilitates Adaptation in Freshwater Unionid
Gene family amplification facilitates adaptation in freshwater unionid bivalve Megalonaias nervosa Rebekah L. Rogers1∗, Stephanie L. Grizzard1;2, James E. Titus-McQuillan1, Katherine Bockrath3;4 Sagar Patel1;5;6, John P. Wares3;7, Jeffrey T Garner8, Cathy C. Moore1 Author Affiliations: 1. Department of Bioinformatics and Genomics, University of North Carolina, Charlotte, NC 2. Department of Biological Sciences, Old Dominion University, Norfolk, VA 3. Department of Genetics, University of Georgia, Athens, GA 4. U.S. Fish and Wildlife Service, Midwest Fisheries Center Whitney Genetics Lab, Onalaska, WI 5. Department of Biology, Saint Louis University, St. Louis, MO 6. Donald Danforth Plant Science Center, St. Louis, MO 7. Odum School of Ecology, University of Georgia, Athens, GA 8. Division of Wildlife and Freshwater Fisheries, Alabama Department of Conservation and Natural Resources, Florence, AL *Corresponding author: Department of Bioinformatics and Genomics, University of North Carolina, Charlotte, NC. [email protected] Keywords: Unionidae, M. nervosa, Evolutionary genomics, gene family expansion, arXiv:2008.00131v2 [q-bio.GN] 16 Nov 2020 transposable element evolution, Cytochrome P450, Population genomics, reverse ecological genetics Short Title: Gene family expansion in Megalonaias nervosa 1 Abstract Freshwater unionid bivalves currently face severe anthropogenic challenges. Over 70% of species in the United States are threatened, endangered or extinct due to pollution, damming of waterways, and overfishing. These species are notable for their unusual life history strategy, parasite-host coevolution, and biparental mitochondria inheritance. Among this clade, the washboard mussel Megalonaias nervosa is one species that remains prevalent across the Southeastern United States, with robust population sizes. We have created a reference genome for M. -
Retroviral Insertions Into a Herpesvirus Are Clustered At
Proc. Natl. Acad. Sci. USA Vol. 90, pp. 3855-3859, May 1993 Biochemistry Retroviral insertions into a herpesvirus are clustered at the junctions of the short repeat and short unique sequences (Marek disease virus/reticuloendotheliosis virus/long terminal repeat/insertional mutagenesis/retroviral integration) DAN JONES*, ROBERT ISFORTt, RICHARD WITTERt, RHONDA KoST*, AND HSING-JIEN KUNG*§ *Department of Molecular Biology and Microbiology, Case Western Reserve University, Cleveland, OH 44106; tGenetic Toxicology Section, Human and Environmental Safety Division, The Procter and Gamble Company, Miami Valley Laboratories, Cincinnati, OH 45239; and tU.S. Department of Agriculture Agricultural Research Service, Avian Disease and Oncology Laboratory, 3606 East Mount Hope, East Lansing, MI 48823 Communicated by Frederick C. Robbins, January 11, 1993 (receivedfor review November 3, 1992) ABSTRACT We previously described the integration of a integrations are associated with large structural changes in nonacute retrovirus, reticuloendotheliosis virus (REV), into the MDV genome in both the Us and Rs regions (11). the genome of a herpesvirus, Marek disease virus (MDV), By coinfection of duck embryo fibroblasts (DEFs) with following both long-term and short-term coinfection in cul- both REV and MDV, we demonstrated that this process of tured fibroblasts. The long-term coinfection occurred in the retroviral integration can also occur within several passages course of attenuating the oncogenicity ofthe JM strain ofMDV of cocultivation (10). The structure of the inserted REV and was sustained for >100 passages. The short-term coinfec- sequences resembles those of cellular integrated proviruses, tion, which spanned only 16 passages, was designed to recreate with loss of the terminal nucleotides of the retrovirus and a the insertion phenomenon under controlled conditions. -
CRISPR/Cas9-Mediated Genome Editing Efficiently Creates Specific
www.nature.com/scientificreports Correction: Author Correction OPEN CRISPR/Cas9-mediated genome editing efciently creates specifc mutations at multiple loci using one Received: 18 April 2017 Accepted: 3 July 2017 sgRNA in Brassica napus Published: xx xx xxxx Hong Yang1, Jia-Jing Wu1, Ting Tang1, Ke-De Liu 2 & Cheng Dai1 CRISPR/Cas9 is a valuable tool for both basic and applied research that has been widely applied to diferent plant species. Nonetheless, a systematical assessment of the efciency of this method is not available for the allotetraploid Brassica napus—an important oilseed crop. In this study, we examined the mutation efciency of the CRISPR/Cas9 method for 12 genes and also determined the pattern, specifcity and heritability of these gene modifcations in B. napus. The average mutation frequency for a single-gene targeted sgRNA in the T0 generation is 65.3%. For paralogous genes located in conserved regions that were targeted by sgRNAs, we observed mutation frequencies that ranged from 27.6% to 96.6%. Homozygotes were readily found in T0 plants. A total of 48.2% of the gene mutations, including homozygotes, bi-alleles, and heterozygotes were stably inherited as classic Mendelian alleles in the next generation (T1) without any new mutations or reversions. Moreover, no mutation was found in the putative of-target sites among the examined T0 plants. Collectively, our results demonstrate that CRISPR/Cas9 is an efcient tool for creating targeted genome modifcations at multiple loci that are stable and inheritable in B. napus. These fndings open many doors for biotechnological applications in oilseed crops. -
Human Immunodeficiency Virus Type 1 Two-Long Terminal Repeat
Isabel Olivares, et al.: HIV-1 Two-Long Terminal Repeat Circles Contents available at PubMed www.aidsreviews.com PERMANYER AIDS Rev. 2016;18:23-31 www.permanyer.com Human Immunodeficiency Virus Type 1 Two-Long Terminal Repeat Circles: A Subject for Debate Isabel Olivares, María Pernas, Concepción Casado and Cecilio López-Galindez Department of Molecular Virology, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain © Permanyer Publications 2016 Abstract . HIV-1 infections are characterized by the integration of the reverse transcribed genomic RNA into the host chromosomes making up the provirus. In addition to the integrated proviral DNA, there are other forms of linear and circular unintegrated viral DNA in HIV-1-infected cells. One of these forms, known as two-long terminal repeat circles, has been extensively studied and characterized both in in vitro infected cells and in cells of the publisher from patients. Detection of two-long terminal repeat circles has been proposed as a marker of antire troviral treatment efficacy or ongoing replication in patients with undetectable viral load. But not all authors agree with this use because of the uncertainty about the lifespan of the two-long terminal repeat circles. We review the major studies estimating the half-life of the two-long terminal repeat circles as well as those proposing its detection as a marker of ongoing replication or therapeutic efficacy. We also review the charac- teristic of these circular forms and the difficulties in its detection and quantification. The variety of approaches and methods used in the two-long terminal repeat quantification as well as the low reliability of some methods make the comparison between results difficult. -
Repetitive Elements in Humans
International Journal of Molecular Sciences Review Repetitive Elements in Humans Thomas Liehr Institute of Human Genetics, Jena University Hospital, Friedrich Schiller University, Am Klinikum 1, D-07747 Jena, Germany; [email protected] Abstract: Repetitive DNA in humans is still widely considered to be meaningless, and variations within this part of the genome are generally considered to be harmless to the carrier. In contrast, for euchromatic variation, one becomes more careful in classifying inter-individual differences as meaningless and rather tends to see them as possible influencers of the so-called ‘genetic background’, being able to at least potentially influence disease susceptibilities. Here, the known ‘bad boys’ among repetitive DNAs are reviewed. Variable numbers of tandem repeats (VNTRs = micro- and minisatellites), small-scale repetitive elements (SSREs) and even chromosomal heteromorphisms (CHs) may therefore have direct or indirect influences on human diseases and susceptibilities. Summarizing this specific aspect here for the first time should contribute to stimulating more research on human repetitive DNA. It should also become clear that these kinds of studies must be done at all available levels of resolution, i.e., from the base pair to chromosomal level and, importantly, the epigenetic level, as well. Keywords: variable numbers of tandem repeats (VNTRs); microsatellites; minisatellites; small-scale repetitive elements (SSREs); chromosomal heteromorphisms (CHs); higher-order repeat (HOR); retroviral DNA 1. Introduction Citation: Liehr, T. Repetitive In humans, like in other higher species, the genome of one individual never looks 100% Elements in Humans. Int. J. Mol. Sci. alike to another one [1], even among those of the same gender or between monozygotic 2021, 22, 2072.