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Genetics is the study of genes, genetic variation, and heredity in organisms. It is an important branch in biology because heredity is vital to organisms' evolution. Gregor Mendel, a Moravian Augustinian friar working in the 19th century in Brno, was the first to study genetics scientifically. Mendel studied "trait inheritance", patterns in the way traits are handed down from parents to offspring over time. He observed that organisms inherit traits by way of discrete "units of inheritance". This term, still used today, is a somewhat ambiguous definition of what is referred to as a gene.
Genetic engineering, also called genetic modification or genetic manipulation, is the modification and manipulation of an organism's genes using technology. It is a set of technologies used to change the genetic makeup of cells, including the transfer of genes within and across species boundaries to produce improved or novel organisms. New DNA is obtained by either isolating and copying the genetic material of interest using recombinant DNA methods or by artificially synthesising the DNA. A construct is usually created and used to insert this DNA into the host organism. The first recombinant DNA molecule was made by Paul Berg in 1972 by combining DNA from the monkey virus SV40 with the lambda virus. As well as inserting genes, the process can be used to remove, or "knock out", genes. The new DNA can be inserted randomly, or targeted to a specific part of the genome.
Molecular genetics is a branch of biology that addresses how differences in the structures or expression of DNA molecules manifests as variation among organisms. Molecular genetics often applies an "investigative approach" to determine the structure and/or function of genes in an organism's genome using genetic screens.
The four Rowntree Trusts are funded from the legacies of the Quaker chocolate entrepreneurs and social reformers Joseph Rowntree and Benjamin Seebohm Rowntree. The trusts are based in the Rowntrees' home city of York, England. The trusts are:
The Joseph Rowntree Charitable Trust (JRCT) is a philanthropic grant making trust that supports work undertaken in the UK and Ireland, and previously South Africa. It is one of three original trusts set up by Joseph Rowntree in 1904. The Trust supports work in five programme areas: peace and security, rights and justice, power and accountability, sustainable future and Northern Ireland.
A designer baby is a baby whose genetic makeup has been selected or altered, often to exclude a particular gene or to remove genes associated with disease. This process usually involves analysing a wide range of human embryos to identify genes associated with particular diseases and characteristics, and selecting embryos that have the desired genetic makeup; a process known as preimplantation genetic diagnosis. Screening for single genes is commonly practiced, and polygenic screening is offered by a few companies. Other methods by which a baby's genetic information can be altered involve directly editing the genome before birth, which is not routinely performed and only one instance of this is known to have occurred as of 2019, where Chinese twins Lulu and Nana were edited as embryos, causing widespread criticism.
The Council for Responsible Genetics (CRG) was a nonprofit NGO with a focus on biotechnology.
George McDonald Church is an American geneticist, molecular engineer, chemist, serial entrepreneur, and pioneer in personal genomics and synthetic biology. He is the Robert Winthrop Professor of Genetics at Harvard Medical School, Professor of Health Sciences and Technology at Harvard University and Massachusetts Institute of Technology, and a founding member of the Wyss Institute for Biologically Inspired Engineering at Harvard. Through his Harvard lab Church has co-founded around 50 biotech companies pushing the boundaries of innovation in the world of life sciences and making his lab as a hotbed of biotech startup activity in Boston. In 2018, the Church lab at Harvard made a record by spinning off 16 biotech companies in one year. The Church lab works on research projects that are distributed in diverse areas of modern biology like developmental biology, neurobiology, info processing, medical genetics, genomics, gene therapy, diagnostics, chemistry & bioengineering, space biology & space genetics, and ecosystem. Research and technology developments at the Church lab have impacted or made direct contributions to nearly all "next-generation sequencing (NGS)" methods and companies. In 2017, Time magazine listed him in Time 100, the list of 100 most influential people in the world. In 2022, he was featured among the most influential people in biopharma by Fierce Pharma, and was listed among the top 8 famous geneticists of all time in human history. As of January 2023, Church serves as a member of the Bulletin of the Atomic Scientists' Board of Sponsors.
The Center for Genetics and Society (CGS) is a non-profit information and public affairs organization based in Berkeley, California, United States. It encourages responsible use and regulation of new human genetic and reproductive technologies.
Mary-Claire King is an American geneticist. She was the first to show that breast cancer can be inherited due to mutations in the gene she called BRCA1. She studies human genetics and is particularly interested in genetic heterogeneity and complex traits. She studies the interaction of genetics and environmental influences and their effects on human conditions such as breast and ovarian cancer, inherited deafness, schizophrenia, HIV, systemic lupus erythematosus and rheumatoid arthritis. She has been the American Cancer Society Professor of the Department of Genome Sciences and of Medical Genetics in the Department of Medicine at the University of Washington since 1995.
Gene targeting is a biotechnological tool used to change the DNA sequence of an organism. It is based on the natural DNA-repair mechanism of Homology Directed Repair (HDR), including Homologous Recombination. Gene targeting can be used to make a range of sizes of DNA edits, from larger DNA edits such as inserting entire new genes into an organism, through to much smaller changes to the existing DNA such as a single base-pair change. Gene targeting relies on the presence of a repair template to introduce the user-defined edits to the DNA. The user will design the repair template to contain the desired edit, flanked by DNA sequence corresponding (homologous) to the region of DNA that the user wants to edit; hence the edit is targeted to a particular genomic region. In this way Gene Targeting is distinct from natural homology-directed repair, during which the ‘natural’ DNA repair template of the sister chromatid is used to repair broken DNA. The alteration of DNA sequence in an organism can be useful in both a research context – for example to understand the biological role of a gene – and in biotechnology, for example to alter the traits of an organism.
The following outline is provided as an overview of and topical guide to genetics:
The Nuffield Council on Bioethics is a UK-based independent charitable body, which examines and reports on bioethical issues raised by new advances in biological and medical research. Established in 1991, the Council is funded by the Nuffield Foundation, the Medical Research Council and the Wellcome Trust. The Council has been described by the media as a 'leading ethics watchdog', which 'never shrinks from the unthinkable'.
Genome editing, or genome engineering, or gene editing, is a type of genetic engineering in which DNA is inserted, deleted, modified or replaced in the genome of a living organism. Unlike early genetic engineering techniques that randomly inserts genetic material into a host genome, genome editing targets the insertions to site-specific locations. The basic mechanism involved in genetic manipulations through programmable nucleases is the recognition of target genomic loci and binding of effector DNA-binding domain (DBD), double-strand breaks (DSBs) in target DNA by the restriction endonucleases, and the repair of DSBs through homology-directed recombination (HDR) or non-homologous end joining (NHEJ).
Genetic engineering techniques allow the modification of animal and plant genomes. Techniques have been devised to insert, delete, and modify DNA at multiple levels, ranging from a specific base pair in a specific gene to entire genes. There are a number of steps that are followed before a genetically modified organism (GMO) is created. Genetic engineers must first choose what gene they wish to insert, modify, or delete. The gene must then be isolated and incorporated, along with other genetic elements, into a suitable vector. This vector is then used to insert the gene into the host genome, creating a transgenic or edited organism.
Aspects of genetics including mutation, hybridisation, cloning, genetic engineering, and eugenics have appeared in fiction since the 19th century.
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The He Jiankui affair is a scientific and bioethical controversy concerning the use of genome editing following its first use on humans by Chinese scientist He Jiankui, who edited the genomes of human embryos in 2018. He became widely known on 26 November 2018 after he announced that he had created the first human genetically edited babies. He was listed in the Time's 100 most influential people of 2019. The affair led to ethical and legal controversies, resulting in the indictment of He and two of his collaborators, Zhang Renli and Qin Jinzhou. He eventually received widespread international condemnation.
He Jiankui is a Chinese biophysicist who was an associate professor in the Department of Biology of the Southern University of Science and Technology (SUSTech) in Shenzhen, China. Earning his Ph.D. from Rice University in Texas on protein evolution, including that of CRISPR, He learned gene-editing techniques (CRISPR/Cas9) as a postdoctoral researcher at Stanford University in California.
Grahame Bulfield, CBE, FRSE, Hon FRASE is an English geneticist, vice-principal and Emeritus Professor of Genetics at the University of Edinburgh. He is best known as the former director and chief executive of the Roslin Institute, Edinburgh, when in 1996 the research group led by Ian Wilmut first cloned a mammal from an adult somatic cell, a Finnish Dorset lamb named Dolly.
References
- 1 2 "Participant Detail". Within and Beyond the Limits to Human Nature. Retrieved 13 February 2019.
- ↑ "About Human Genetics Alert". Human Genetics Alert. Retrieved 13 February 2019.
- ↑ "Civil society calls for "International Summit on Human Genome Editing" to condemn gene-edited baby claims and experiments". Center for Genetics and Society (Press release). 29 November 2018. Retrieved 13 February 2019.
- ↑ Guides, Rough (2007). The Rough Guide to Genes & Cloning. Rough Guides UK. p. 279. ISBN 9781848362246.
- ↑ Gilbert, Scott F.; Gilbert, Scott; Tyler, Anna L.; Zackin, Emily (2005). Bioethics and the New Embryology: Springboards for Debate. Macmillan. p. 104. ISBN 9780716773450.
- ↑ Godard, B.; Marshall, J.; Laberge, C.; Knoppers, B. M. (September 2004). "Strategies for consulting with the community: The cases of four large-scale genetic databases". Science and Engineering Ethics. 10 (3): 457–477. doi:10.1007/s11948-004-0003-y. hdl: 1866/138 . PMID 15362702.