Legal Framework for Gene Editing in Human Genome “World’S First Mutant Twins by China”
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Shock Greets Claim of CRISPR-Edited Babies Apparent Germline Engineering by Chinese Researcher Prompts Outrage and Investigations
IN DEPTH Downloaded from BIOETHICS Shock greets claim of CRISPR-edited babies http://science.sciencemag.org/ Apparent germline engineering by Chinese researcher prompts outrage and investigations By Dennis Normile, in Hong Kong, China pears to have skipped the profound ethical and other gene-editing techniques as treat- debate that participants at the 2015 summit, ments for genetic diseases, such as muscular he idea that humanity can rewrite its and many meetings since, agreed should take dystrophy and sickle cell anemia. So far, clini- own genetic code long seemed the stuff place before such experiments began. (He did cal trials have only modified somatic cells— of a science fiction novel—and a pretty not responds to requests for an interview.) not sperm or eggs, the germ line. But He on December 30, 2020 scary one at that. But rapid advances Fueling the outcry was the fact that He altered the genome in early stage embryos, in techniques such as CRISPR have didn’t produce any data, let alone a paper, creating edits that may be heritable. Many made it possible, at least in principle, to back up his claim. The biologist was scientists and ethicists don’t rule out making Tto make precise changes to the genome of scheduled to speak at the International such changes to the germ line, but recent re- a human embryo that could help rid fami- Summit on Human Genome Editing here ports from the United States’s National Acad- lies of crippling genetic diseases—or lead to this week, but whether he would show up emies of Sciences, Engineering, and Medicine “designer” babies, gene edited to be smarter was unclear as Science went to press. -
Gene Editing in HIV Research
TREATMENT ACTION GROUP ISSUE BRIEF MARCH 2019 www.treatmentactiongroup.org Gene Editing in HIV Research INTRODUCTION the Southern University of Science and Technology in Shenzhen and placed under investigation by Chinese The term “gene therapy” refers to a broad variety of authorities. approaches that aim to provide therapeutic benefit by manipulating genetic code (DNA or RNA). The strategy Amidst the controversy about He Jiankui, it’s important takes advantage of the fact that DNA acts as a blueprint to appreciate that there is a substantial amount of for manufacturing proteins, via an intermediate step legitimate and responsible gene editing research in HIV. of translation into RNA. Multiple research groups and The best-known example is an experimental therapy biotechnology companies have explored the possibility called SB-728, developed by the company Sangamo of treating HIV with gene therapy, but so far evidence of Therapeutics. SB-728 is designed to edit the gene that efficacy has been limited, and no candidates have been encodes the CCR5 receptor, with the aim of creating submitted to the U.S. Food and Drug Administration cells impervious to infection by HIV. Several other gene (FDA) for possible approval. Importantly, no major editing approaches that may have benefits in HIV are safety issues have emerged to date. also under investigation. Initially, these The purpose of this The purpose of this issue brief is to provide background experimental information on gene editing in HIV research, and issue brief is to provide gene context for the news about He’s misuse of the background information therapies technology to alter embryos. -
Nuclear DNA Content, Chromatin Organization and Chromosome Banding in Brown and Yellow Seeds of Dasypyrum Villosum (L.) P
Heredity 72 (1994) 365—373 Received 7 September 1993 Genetical Society of Great Britain Nuclear DNA content, chromatin organization and chromosome banding in brown and yellow seeds of Dasypyrum villosum (L.) P. Candargy R. CREMONINI*, N. COLONNAI-, A. STEFANIt, I. GALASSO4 & D. PIGNONE4 Dipartimento di Scienze Botaniche, Università di Pisa, Via L. Ghini 5, 56126 Pisa, tScuo/a Super/ore Studi Universitari e Perfezionamento 'S. Anna Via Carducci 40, 56127 Pisa, and Istituto del Germoplasma, CNR, Via Amendola 165, 70123 Ban, Italy Bandingpatterns of metaphase chromosomes and nuclear DNA content in root meristematic cells of yellow and brown seeds of Dasypyrum villosum were determined. Microdensitometric evaluation of nuclear absorptions at different thresholds of optical density after Feulgen reaction indicated the organization of the chromatin in interphase nuclei, and allowed an evaluation of the amount of heterochromatin. These results were compared with those obtained after the application of banding techniques. Keywords:chromatinorganization, chromosome banding, Dasypyrum villosum, fluorochromes, kernels. evident morphological differences; both of them are Introduction able to produce ears with yellow and brown caryopses Manyspecies closely related to Triticum are known to (Stefani & Onnis, 1983). have agronomic characters that make them interesting A different behaviour of seed germination and for wheat improvement, and many studies have been viability during ripening and ageing (Meletti & Onnis, carried out on the possibility of introducing alien genes 1961; Stefani & Onnis, 1983; De Gara et al., 1991) into cultivated wheats (Knott, 1987). and a different duration of the mitotic cycle (Innocenti The genus Dasypyrum includes two Mediterranean & Bitonti, 1983) have been reported for the two types wild species: an annual outcrossing diploid, Dasypyrum of caryopses. -
CRISPR Twins Might Have Shortened Lives
NEWS IN FOCUS REPRODUCIBILITY One paper, two discussions Anaesthesia journal asks independent experts to draw their own conclusions on studies. BY DAVID ADAM Some reproducibility researchers welcome the same time as the peer-reviewed original, the the approach and say that other fields should journal hopes to accelerate the self-correcting ow deeply an anaesthetist should sedate do the same. Efforts to improve reproduc- nature of the literature. “If independent discus- an elderly person before surgery is a ibility have so far focused on methods and sion authors find a fatal flaw, then we’ll have a controversial issue — some studies link results, and need to extend to inferences and bit of a problem. But it won’t be the first time,” Hstronger doses of anaesthetic with earlier deaths. conclusions, says John Ioannidis at Stanford says Hemmings. So it should reassure clinicians to see a study1 University, California, who is one of the The original paper’s lead author praises in the British Journal of Anaesthesia that inves- authors of the independent discussion and the approach. “We’re all biased and this gives tigates and rules out such a link — the paper’s an advocate for bet- a second pair of eyes,” says Frederick Sieber, a discussion section says so explicitly. ter reproducibility in “We’re all researcher in anaesthesiology and critical-care But another paper2 in the journal that dis- science. From simi- biased and this medicine at Johns Hopkins Bayview Medical cusses the clinical trial analyses the same results lar results, people gives a second Center in Baltimore, Maryland. -
Chromatin Insulators and Topological Domains: Adding New Dimensions to 3D Genome Architecture
Genes 2015, 6, 790-811; doi:10.3390/genes6030790 OPEN ACCESS genes ISSN 2073-4425 www.mdpi.com/journal/genes Review Chromatin Insulators and Topological Domains: Adding New Dimensions to 3D Genome Architecture Navneet K. Matharu 1,* and Sajad H. Ahanger 2,* 1 Department of Bioengineering and Therapeutic Sciences, Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94143, USA 2 Department of Ophthalmology, Lab for Retinal Cell Biology, University of Zurich, Wagistrasse 14, Zurich 8952, Switzerland * Authors to whom correspondence should be addressed; E-Mails: [email protected] (N.K.M.); [email protected] (S.H.A.). Academic Editor: Jessica Tyler Received: 8 June 2015 / Accepted: 20 August 2015 / Published: 1 September 2015 Abstract: The spatial organization of metazoan genomes has a direct influence on fundamental nuclear processes that include transcription, replication, and DNA repair. It is imperative to understand the mechanisms that shape the 3D organization of the eukaryotic genomes. Chromatin insulators have emerged as one of the central components of the genome organization tool-kit across species. Recent advancements in chromatin conformation capture technologies have provided important insights into the architectural role of insulators in genomic structuring. Insulators are involved in 3D genome organization at multiple spatial scales and are important for dynamic reorganization of chromatin structure during reprogramming and differentiation. In this review, we will discuss the classical view and our renewed understanding of insulators as global genome organizers. We will also discuss the plasticity of chromatin structure and its re-organization during pluripotency and differentiation and in situations of cellular stress. -
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. -
Effects on Transcription and Nuclear Organization
30 Oct 2001 7:3 AR AR144-08.tex AR144-08.SGM ARv2(2001/05/10) P1: GJC Annu. Rev. Genet. 2001. 35:193–208 Copyright c 2001 by Annual Reviews. All rights reserved CHROMATIN INSULATORS AND BOUNDARIES: Effects on Transcription and Nuclear Organization Tatiana I. Gerasimova and Victor G. Corces Department of Biology, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218; e-mail: [email protected]; [email protected] Key Words DNA, chromatin, insulators, transcription, nucleus ■ Abstract Chromatin boundaries and insulators are transcriptional regulatory el- ements that modulate interactions between enhancers and promoters and protect genes from silencing effects by the adjacent chromatin. Originally discovered in Drosophila, insulators have now been found in a variety of organisms, ranging from yeast to hu- mans. They have been found interspersed with regulatory sequences in complex genes and at the boundaries between active and inactive chromatin. Insulators might mod- ulate transcription by organizing the chromatin fiber within the nucleus through the establishment of higher-order domains of chromatin structure. CONTENTS INTRODUCTION .....................................................193 SPECIFIC EXAMPLES OF INSULATOR ELEMENTS .......................194 Insulator Elements in Drosophila .......................................195 The Chicken -Globin Locus and Other Vertebrate Boundary Elements ........................................198 Yeast Boundary Elements .............................................199 MECHANISMS OF INSULATOR FUNCTION .............................200 OTHER FACTORS INVOLVED IN INSULATOR FUNCTION .................203 INTRODUCTION Insulators or chromatin boundaries are DNA sequences defined operationally by two characteristics: They interfere with enhancer-promoter interactions when present between them, and they buffer transgenes from chromosomal position effects (diagrammed in Figures 1 and 2) (30). These two properties must be mani- festations of the normal role these sequences play in the control of gene expression. -
Dynamics and Interplay of Nuclear Architecture, Genome Organization, and Gene Expression
Downloaded from genesdev.cshlp.org on September 29, 2021 - Published by Cold Spring Harbor Laboratory Press REVIEW Dynamics and interplay of nuclear architecture, genome organization, and gene expression Robert Schneider and Rudolf Grosschedl1 Max Planck Institute of Immunobiology, 79108 Freiburg, Germany The organization of the genome in the nucleus of a eu- The nucleus is organized in specific compartments karyotic cell is fairly complex and dynamic. Various fea- that include proteinaceous nuclear bodies, eukaryotic tures of the nuclear architecture, including compart- and heterochromatic chromatin domains, compartmen- mentalization of molecular machines and the spatial talized multiprotein complexes, and nuclear pores that arrangement of genomic sequences, help to carry out and allow for nucleocytoplasmic transport. The dynamic, regulate nuclear processes, such as DNA replication, temporal, and spatial organization of the eukaryotic cell DNA repair, gene transcription, RNA processing, and nucleus emerges as a central determinant of genome mRNA transport. Compartmentalized multiprotein function, and it is important to understand the relation- complexes undergo extensive modifications or exchange ship between nuclear architecture, genome organization, of protein subunits, allowing for an exquisite dynamics and gene expression. Recently, high-resolution tech- of structural components and functional processes of the niques have permitted new insights into the nuclear ar- nucleus. The architecture of the interphase nucleus is chitecture and its relationship to gene expression. linked to the spatial arrangement of genes and gene clus- In this review, we focus on the dynamic organization ters, the structure of chromatin, and the accessibility of of the genome into chromosome territories and chroma- regulatory DNA elements. In this review, we discuss re- tin domains. -
Genetically Customized Generations—A Need for Increased Regulatory Control Over Gene Editing Technology in the United States
SMU Law Review Volume 73 Issue 3 Article 10 2020 Genetically Customized Generations—A Need for Increased Regulatory Control over Gene Editing Technology in the United States Morgan Mendicino Southern Methodist University, Dedman School of Law, [email protected] Follow this and additional works at: https://scholar.smu.edu/smulr Part of the Law Commons Recommended Citation Morgan Mendicino, Comment, Genetically Customized Generations—A Need for Increased Regulatory Control over Gene Editing Technology in the United States, 73 SMU L. REV. 585 (2020) https://scholar.smu.edu/smulr/vol73/iss3/10 This Comment is brought to you for free and open access by the Law Journals at SMU Scholar. It has been accepted for inclusion in SMU Law Review by an authorized administrator of SMU Scholar. For more information, please visit http://digitalrepository.smu.edu. GENETICALLY CUSTOMIZED GENERATIONS—A NEED FOR INCREASED REGULATORY CONTROL OVER GENE EDITING TECHNOLOGY IN THE UNITED STATES Morgan Mendicino* ABSTRACT Gene editing technology, once a far-fetched scientific fantasy, has be- come a tangible reality. One emerging form of gene editing in particular, human germline genome editing, possesses revolutionary capabilities that warrant cautious examination. Recent advancements in research have demonstrated that such biotechnology could be used to alter the genetic makeup of unborn children and the hereditary genes of future generations. This biotechnology may possess the ability to save countless human lives, but we must ask—What happens when the line between preventing disease and “playing God” becomes blurry? Human germline genome editing raises a multitude of widespread and deeply rooted questions surrounding the fate of humanity, all of which thwart justifying its present-day use. -
He Jiankui (贺建奎)Incident
The “He JianKui (贺建奎) Incident”: Summary of Facts and Concerns Olivia Ngan Post-doctoral Fellow CUHK Centre for Bioethics The Chinese University of Hong Kong CUHK Centre for Bioethics, Seminar on Germline Genome Editing 03.28.2019 1 2 Outline • Key events after He JianKui’s breaking the news of his work • Reaction and current consensus from the scientific community, professional society in germline genome editing 3 CRISPR Technology CRISPR is a simple yet powerful tool for editing genomes. It allow genetic material to be added, removed, or altered at particular locations in the genome. Potential applications include correcting genetic defects, treating and preventing the spread of diseases and improving crops. Timeline of “CRISPR-related events” Scientists showed that Produce customized dogs with CRISPR could be used to double the amount of muscle edit the genomes of mass by deleting a gene cultured mouse cells or human cells 2012 2014 2016 2013 2015 First monkeys engineered with CRISPR to edit targeted mutations the genes of using CRISPR various crops to make them CRISPR was discovered more nutritious 4 Timeline of “CRISPR-related events” • Gene editing in embryos intended for pregnancy has not previously been reported. • CRISPR is remarkably accurate at editing the genes that it is supposed to edit, but it can also cause off- target mutations. 2018 • No one has previously tried editing embryos that develop into humans, because the science is not yet precise enough to guarantee the results. 2018 • He shocked the world by making the world’s -
Breaking the Germline Barrier in a Moral Vacuum
Accountability in Research Policies and Quality Assurance ISSN: 0898-9621 (Print) 1545-5815 (Online) Journal homepage: https://www.tandfonline.com/loi/gacr20 Breaking the germline barrier in a moral vacuum Sheldon Krimsky To cite this article: Sheldon Krimsky (2019): Breaking the germline barrier in a moral vacuum, Accountability in Research, DOI: 10.1080/08989621.2019.1644171 To link to this article: https://doi.org/10.1080/08989621.2019.1644171 Accepted author version posted online: 15 Jul 2019. Published online: 26 Jul 2019. Submit your article to this journal Article views: 37 View Crossmark data Full Terms & Conditions of access and use can be found at https://www.tandfonline.com/action/journalInformation?journalCode=gacr20 ACCOUNTABILITY IN RESEARCH https://doi.org/10.1080/08989621.2019.1644171 Breaking the germline barrier in a moral vacuum Sheldon Krimsky Department of Urban & Environmental Policy & Planning, Tufts University, Medford, MA, USA ABSTRACT KEYWORDS In November 2018 a Chinese scientist claimed to have used CRISPR/Cas9; gene editing; CRISPR/Cas 9 technology to genetically modify two human human embryos; AIDS; embryos that were then gestated in one adult woman through CCR5; HIV an IVF pregnancy and brought to term. The twin girls are allegedly the first babies born with their prenatal genomes edited. Using both English language and Chinese supporting documents, this paper discusses the background of this human experiment, the social context of Chinese science, and the alleged ethical transgressions of its principal scientist. Introduction The international science community was caught off guard in late November 2018 when Chinese scientist Dr. He Jiankui announced through the media that he had used CRISPR/Cas9 editing technology to modify the genes of two human embryos, which were subsequently implanted in a Chinese woman by IVF techniques and brought to term as fraternal twin girls. -
M1BP Cooperates with CP190 to Activate Transcription at TAD Borders and Promote Chromatin Insulator Activity
ARTICLE https://doi.org/10.1038/s41467-021-24407-y OPEN M1BP cooperates with CP190 to activate transcription at TAD borders and promote chromatin insulator activity Indira Bag 1,2, Shue Chen 1,2,4, Leah F. Rosin 1,2,4, Yang Chen 1,2, Chen-Yu Liu3, Guo-Yun Yu3 & ✉ Elissa P. Lei 1,2 1234567890():,; Genome organization is driven by forces affecting transcriptional state, but the relationship between transcription and genome architecture remains unclear. Here, we identified the Drosophila transcription factor Motif 1 Binding Protein (M1BP) in physical association with the gypsy chromatin insulator core complex, including the universal insulator protein CP190. M1BP is required for enhancer-blocking and barrier activities of the gypsy insulator as well as its proper nuclear localization. Genome-wide, M1BP specifically colocalizes with CP190 at Motif 1-containing promoters, which are enriched at topologically associating domain (TAD) borders. M1BP facilitates CP190 chromatin binding at many shared sites and vice versa. Both factors promote Motif 1-dependent gene expression and transcription near TAD borders genome-wide. Finally, loss of M1BP reduces chromatin accessibility and increases both inter- and intra-TAD local genome compaction. Our results reveal physical and functional inter- action between CP190 and M1BP to activate transcription at TAD borders and mediate chromatin insulator-dependent genome organization. 1 Nuclear Organization and Gene Expression Section, Bethesda, MD, USA. 2 Laboratory of Biochemistry and Genetics, Bethesda, MD, USA. 3 Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA. ✉ 4These authors contributed equally: Shue Chen, Leah F.