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| Clones | |
|---|---|
| Name | Clones |
| Field | Biotechnology |
| Introduced | 20th century |
Clones are organisms, cells, or genetic constructs produced to be genetically identical to a source specimen. Cloning spans molecular, cellular, organismal, and ecological scales and intersects with biotechnology, agriculture, medicine, and conservation. Research and debate involve actors such as universities, biotechnology firms, regulatory agencies, and international bodies.
Cloning encompasses techniques yielding identical genetic copies and includes categories such as reproductive cloning, therapeutic cloning, molecular cloning, and cellular cloning. Reproductive cloning creates whole organisms and has been pursued in projects associated with institutions like Roslin Institute, University of Cambridge, Harvard University, University of California, San Francisco, Massachusetts Institute of Technology. Therapeutic cloning produces tissues or organs for treatment and is linked to groups such as Stanford University, Karolinska Institutet, Mayo Clinic, Johns Hopkins University, Imperial College London. Molecular cloning replicates DNA sequences and is foundational in labs at Cold Spring Harbor Laboratory, European Molecular Biology Laboratory, Max Planck Society, Salk Institute for Biological Studies, Howard Hughes Medical Institute. Cellular cloning derives cell lines, including embryonic stem cell lines developed at University of Wisconsin–Madison, University of Arizona, University of Tokyo, Peking University, Seoul National University.
Common methods include somatic cell nuclear transfer, embryo splitting, induced pluripotent stem cell reprogramming, and recombinant DNA techniques. Somatic cell nuclear transfer (SCNT) was refined in labs like Roslin Institute, with protocols influenced by work at University of Edinburgh, Cambridge University Hospitals NHS Foundation Trust, National Institutes of Health, Riken. Embryo splitting techniques were employed in research programs at Wistar Institute, Scripps Research, Yale University, University of Pennsylvania, Princeton University. Induced pluripotent stem cell (iPSC) reprogramming originated from teams at Kyoto University, University of Tokyo, Gladstone Institutes, Center for Regenerative Medicine (Boston) and was advanced by collaborations with NIH Stem Cell Unit, Wellcome Trust Sanger Institute, European Commission funded consortia. Molecular cloning relies on tools and companies such as Addgene, New England Biolabs, Thermo Fisher Scientific, GenScript, Agilent Technologies and techniques developed at University of California, Berkeley, Stanford University School of Medicine, Massachusetts General Hospital.
Cloning methods are applied in agriculture, medicine, conservation biology, and basic research. Agricultural cloning has been used by firms and research centers like Monsanto, Cargill, National Institute of Agricultural Botany, Agricultural Research Service, International Rice Research Institute to propagate desirable genotypes. Medical applications include patient-specific cell therapies pursued at Mayo Clinic, Cleveland Clinic, UCLA Health, Karolinska University Hospital, Mount Sinai Health System. Conservation cloning projects have been attempted by organizations such as Smithsonian Institution, San Diego Zoo Global, World Wildlife Fund, Conservation International, Zoological Society of London. Basic research employing cloning informs developmental biology and genomics in centers like Broad Institute, European Bioinformatics Institute, Dana-Farber Cancer Institute, Fred Hutchinson Cancer Center, Cold Spring Harbor Laboratory.
Debate over cloning involves bioethicists, legislators, religious institutions, and advocacy groups. Ethical concerns are raised in discussions led by President's Council on Bioethics, Nuffield Council on Bioethics, Pontifical Academy for Life, Human Fertilisation and Embryology Authority, European Court of Human Rights. Legal frameworks differ across jurisdictions, shaped by statutes from bodies such as United States Congress, European Parliament, Parliament of the United Kingdom, Knesset, National People's Congress (China), and policies from agencies including Food and Drug Administration, European Medicines Agency, Health Canada, Therapeutic Goods Administration. Social debates engage organizations like Amnesty International, Greenpeace, Bill & Melinda Gates Foundation, Wellcome Trust, Robert Wood Johnson Foundation.
Technical obstacles include low efficiency, epigenetic instability, immunological rejection, and developmental abnormalities documented in studies from Roslin Institute, NIH, Riken Center for Developmental Biology, Institut Pasteur, CNRS. Molecular hurdles relate to DNA repair, telomere dynamics, and mitochondrial-nuclear interactions investigated at Cold Spring Harbor Laboratory, Salk Institute, Max Planck Institute for Molecular Genetics, Whitehead Institute, EMBL. Translational barriers involve regulatory approval pathways administered by FDA, EMA, Medicines and Healthcare products Regulatory Agency, Pharmaceuticals and Medical Devices Agency (Japan), and ethical oversight by institutional review boards at universities such as Harvard Medical School and Yale School of Medicine.
Key milestones include nuclear transfer experiments by researchers at University of Cambridge and University of Edinburgh, the cloning of Dolly the sheep at Roslin Institute in 1996, and subsequent mammalian clones like CC the cat by teams at Texas A&M University and Genetics Institute. Notable human-related stem cell and cloning controversies involved institutions such as Harvard University, University of Massachusetts Medical School, Kyoto University (Shinya Yamanaka), University of Wisconsin–Madison (James Thomson). Conservation cloning attempts involved collaborations between San Diego Zoo Global and Revive & Restore and high-profile media coverage by outlets like BBC, The New York Times, Nature (journal), Science (journal). International summits and declarations by United Nations Educational, Scientific and Cultural Organization, World Health Organization, Council of Europe, and panels convened by Royal Society and National Academies of Sciences, Engineering, and Medicine shaped policy responses.