Therapeutic Cloning vs Reproductive Cloning
They share a starting technique. They share almost nothing else. Two very different procedures, lined up side by side.
Therapeutic cloning and reproductive cloning are often discussed in the same sentence, which makes a certain sense — both start with the same laboratory technique, somatic cell nuclear transfer (SCNT). After that starting point, however, they diverge sharply. Almost every important question about either of them depends on which of the two is being discussed.
Shared starting point
In both procedures, scientists begin with SCNT: the nucleus of a body cell is transferred into an egg cell whose own nucleus has been removed. The reconstructed cell can then be coaxed to behave like a fertilised egg and begin to divide, producing an early-stage embryo.
This is where the similarity ends.
Therapeutic cloning
- Purpose. Research. Specifically, the production of early-stage cells from which donor-matched pluripotent stem cells can sometimes be derived.
- What happens to the cells. They are studied in the laboratory. They are not implanted.
- Goal. To learn about disease, screen potential treatments, and explore future cell-based therapies.
- Regulation. Tightly regulated. Where permitted, embryos must be maintained only within strict developmental limits and may not be used reproductively.
- Ethical debate. Centres on the moral status of early embryos used in research.
Reproductive cloning
- Purpose. The production of a living organism. In animals, this has been demonstrated since 1996. In humans, it has not been done.
- What happens to the embryo. In the hypothetical human case, it would be transferred to a uterus with the aim of producing a pregnancy.
- Goal. To produce an organism genetically very similar to a donor.
- Regulation. Broadly prohibited in humans, by national law and international declarations.
- Ethical debate. Goes beyond embryo status to include safety, identity, dignity, family, and equity.
Why the distinction is not a technicality
In ethical and legal terms, therapeutic and reproductive cloning are usually treated as different categories, not different doses of the same thing. Many jurisdictions permit some form of therapeutic research while flatly prohibiting reproductive use. The categorical line is intentional. It rests on the difference between studying cells and producing a person.
Sliding between the two terms — for instance, calling all SCNT-based research “cloning” without qualification — tends to make policy debates harder, not clearer.
Key takeaway
Therapeutic cloning is research into cells. Reproductive cloning is the production of organisms. They share a technique and almost nothing else.
The role of iPSCs
Since 2006–2007, induced pluripotent stem cells (iPSCs) have absorbed much of the original research case for therapeutic cloning. iPSCs are produced by reprogramming ordinary adult cells in the laboratory and do not require an embryo. Their arrival has reshaped what therapeutic cloning is and is not used for.
iPSCs have no equivalent role in reproductive cloning, which remains both technically unaccomplished in humans and broadly prohibited.