First Human Embryo Cloned
South Korean scientists reported the first cloned human embryo, raising global bioethics debate
February 12, 2004
Science Crosses a New Line
In November 2001, a biotechnology company called Advanced Cell Technology announced it had created the first cloned human embryo. The embryo, produced using somatic cell nuclear transfer — the same technique used to clone Dolly the sheep in 1996 — developed only to the six-cell stage before stopping. The announcement set off an immediate firestorm of ethical debate. Supporters argued the research could lead to breakthroughs in regenerative medicine, offering hope for patients with Parkinson's disease, diabetes, and spinal cord injuries. Critics argued it crossed a fundamental ethical boundary.
The Ethics Debate
The cloning announcement forced difficult questions about the moral status of human embryos. Religious groups and pro-life advocates argued that creating human embryos for research purposes, even for therapeutic goals, was morally unacceptable because it treated human life as a means to an end. Scientists and bioethicists supporting the research drew a sharp distinction between therapeutic cloning — aimed at medical treatments — and reproductive cloning, which would attempt to implant a cloned embryo and bring it to birth. Most scientists and governments opposed reproductive cloning while debating the merits of therapeutic research.
Laws, Bans, and New Technologies
Many countries quickly moved to ban or restrict human cloning research. The United States passed no comprehensive federal law, but several states enacted bans. The debate drove development of alternative approaches, including induced pluripotent stem cells — a method discovered in 2006 that reprograms adult cells to act like embryonic stem cells without requiring embryo creation. This breakthrough largely shifted research away from cloning. The episode illustrates how scientific advances constantly challenge society to set ethical boundaries. Use the date calculator to trace how rapidly biotechnology has advanced since 2001.