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Animal cloning by somatic cell nuclear transfer (SCNT) makes an embryo from an egg cell whose nucleus has been removed and nuclear material from a donor body cell. The reconstructed egg is activated, cultured until it reaches a suitable embryo stage, and transferred to a surrogate dam. If development succeeds, the surrogate carries the pregnancy and gives birth; she does not supply the clone’s nuclear DNA.
The method is intended to reproduce the donor’s nuclear genetic makeup, not to recreate every feature, experience, or behavior of the original animal. Egg-cell components, prenatal conditions, development and later environment all influence the result, and failure can occur at several stages.
What animal cloning means
In this context, “cloning” normally means reproductive cloning by SCNT. A somatic cell is an ordinary body cell, such as a skin cell, rather than an egg or sperm cell. Researchers use the somatic cell’s nucleus, which contains the donor animal’s nuclear DNA, to replace the nucleus of an egg.
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- A breeder or researcher selects a donor animal and collects a somatic cell.
- An immature oocyte is collected and its nucleus is removed.
- The donor cell or its nucleus is placed with the enucleated egg.
- The two are fused or otherwise combined, then the reconstructed egg is activated.
- If cell division proceeds, the embryo is cultured to a transfer stage.
- The embryo is implanted in a surrogate dam, which carries the pregnancy.
Protocols vary by species and laboratory. In livestock work described by the U.S. Food and Drug Administration (FDA), immature eggs may even be collected from ovaries obtained at slaughter. Some laboratories transfer an entire donor cell; others transfer only its nucleus.
How SCNT works, step by step
1. Selecting and collecting the donor cell
The donor is chosen because its inherited traits are valuable to a breeding program. Examples might include a combination of production, conformation or disease-related traits that a breeder wants to reproduce. Researchers take a somatic cell from that animal and maintain it under laboratory conditions so its nuclear material can be used in the transfer.
Because the donor cell is already differentiated, its nucleus is programmed for an adult cell’s job. Turning that nucleus back into a state capable of directing an embryo is one of SCNT’s central technical challenges.
2. Preparing an egg
An oocyte supplies the cellular environment needed for the first stages of development. Before transfer, researchers remove the oocyte’s nucleus, a procedure called enucleation. This removes the egg’s nuclear genes while leaving its cytoplasm and molecular machinery.
The egg therefore contributes more than empty space. Components in the cytoplasm help organize early cell divisions and must respond correctly when the donor nucleus is introduced. Enucleation is performed with specialized laboratory equipment, and the exact timing and handling differ among species.
3. Introducing the donor nuclear material
The donor material is brought together with the enucleated egg. FDA’s risk-assessment description notes two broad approaches: transferring a whole donor cell into the egg or transferring the donor nucleus itself. The laboratory may use electrical or other fusion methods to make the donor material and egg function as one reconstructed cell.
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At this point, the reconstructed egg contains the donor’s nuclear genome in an egg cytoplasm that came from a different animal. That distinction matters when explaining what is and is not copied.
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Fusion alone does not guarantee development. The reconstructed egg must be activated with a stimulus that causes it to begin dividing as an embryo would. Activation also has to overcome the donor nucleus’s previous, specialized cellular programming.
The egg’s molecular machinery must reprogram the differentiated nucleus so that genes needed for early embryonic development are used in the correct order. FDA and other scientific discussions describe this reprogramming requirement as a major reason cloning efficiency is difficult to predict.
5. Culturing and assessing the embryo
Reconstructed eggs are cultured in the laboratory while researchers observe whether they divide and reach a stage suitable for transfer. Many do not become viable embryos. Even embryos that look suitable for transfer may later fail to implant or sustain a pregnancy.
There is no single success percentage that honestly represents all animal cloning. The outcome depends on species, donor-cell condition, egg source, fusion and activation protocol, culture conditions, embryo selection and the denominator used for the calculation. FDA’s assessment specifically notes that the technology did not permit reliable prediction of which conditions would optimize cloning efficiency.
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6. Transferring the embryo to a surrogate
A developing embryo is placed in the uterus of a surrogate dam whose reproductive cycle has been synchronized with the embryo’s stage. The surrogate supplies the uterus, gestation and birth. In an SCNT arrangement, she is not the animal that supplied the transferred nuclear DNA.
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Transfer does not end the technical risk. The embryo must attach to the uterine lining, form a functioning placenta and continue developing. A pregnancy can be lost after implantation, and complications can affect both the fetus and the surrogate.
7. Birth and identification of the clone
If gestation continues normally, the surrogate gives birth. Genetic testing can establish whether the offspring carries the expected nuclear genotype from the donor. A successful birth demonstrates that the entire chain—from cell preparation through gestation—worked for that individual case; it does not show that the method is routine across species or laboratories.
What each animal contributes
| Contributor | What it supplies | What it does not determine alone |
|---|---|---|
| Donor animal | A somatic cell or nucleus containing the nuclear DNA that the clone is intended to match. | The clone’s complete development, appearance, behavior or life history. |
| Egg donor | An enucleated oocyte and its cytoplasm, including cellular machinery needed for early development and other non-nuclear material. | The donor’s nuclear genotype; the egg nucleus is removed before transfer. |
| Surrogate dam | The uterus, pregnancy environment, nourishment during gestation and birth. | The transferred embryo’s donor nuclear DNA. |
| Postnatal environment | Nutrition, care, housing, training, disease exposure and other conditions after birth. | A guarantee that the animal will resemble the donor in every trait. |
Is a clone an exact duplicate?
A clone is intended to have the same nuclear genetic makeup as the animal that supplied the donor nucleus. FDA often explains this by comparing a clone with an identical twin born at a different time. That is a useful analogy, but it is not a promise of a visually or behaviorally perfect duplicate.
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The egg contributes cellular material outside the nucleus, and the pregnancy takes place in a different uterus under potentially different conditions. Developmental events before birth and the animal’s later environment also influence traits. Two animals with the same nuclear DNA can therefore differ in growth, health, temperament or performance.
Cloning also does not copy the donor’s memories, training, age or acquired characteristics. It reproduces inherited nuclear information; it does not send an adult animal backward in time or transfer its experiences to the offspring.
Why livestock producers clone animals
FDA describes livestock cloning mainly as a way to reproduce valuable breeding animals, not as a routine method for producing food animals directly. A breeder may clone an animal with a particularly desirable nuclear genotype and then use the clone in conventional breeding.
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That strategy preserves a genotype that ordinary mating cannot guarantee. Sexual reproduction combines genetic material from two parents and creates variation among offspring. A clone, by contrast, is intended to reproduce one donor’s nuclear combination. The clone’s offspring are produced by normal sexual reproduction and therefore inherit a mixture of genes from the clone and its mate.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchCloning can also provide another copy of a breeding animal after the original is infertile, injured or dead, provided suitable cells were collected and preserved. The decision still depends on cost, animal-welfare considerations, reproductive performance and the value of the genotype; cloning does not automatically make a breeding program more productive.
SCNT compared with breeding and genetic engineering
| Approach | Genetic material involved | Main outcome |
|---|---|---|
| SCNT cloning | A donor nucleus is placed into an enucleated egg. | Attempts to reproduce one donor’s nuclear genotype. |
| Conventional breeding | Sperm and egg from two parents combine their genomes. | Produces genetically varied offspring and cannot guarantee the exact parental combination. |
| Genetic engineering | DNA is deliberately added, removed or changed using a separate modification method. | Creates a genetic alteration; it is not the same process as transferring an unchanged donor nucleus. |
SCNT and genetic engineering can be combined in some research projects, but they answer different questions. Basic SCNT transfers existing nuclear material. Genetic engineering changes genetic material through an additional intervention. Calling every clone “genetically engineered” is therefore inaccurate.
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Failure can occur before an embryo forms, during laboratory culture, after transfer, during implantation or later in pregnancy. A pregnancy that appears established can still be lost, and a live birth does not prove that the gestation was uncomplicated.
- Reprogramming failure: The donor nucleus may not be reset correctly for embryonic development.
- Embryo-development failure: The reconstructed egg may divide abnormally or stop developing in culture.
- Implantation or placental failure: An embryo may fail to establish a stable pregnancy or form a functional placenta.
- Pregnancy complications: Abnormal fetal growth can endanger both fetus and surrogate.
- Postnatal problems: An offspring that survives birth may still require veterinary monitoring for developmental abnormalities.
FDA’s primer discusses Large Offspring Syndrome in cattle and sheep. Excessive fetal growth and associated placental or pregnancy problems can make delivery dangerous and increase risks for the surrogate dam. These concerns are why efficiency alone is not an adequate measure of cloning’s effects: the health of failed pregnancies, fetuses and surrogate animals must also be considered.
Historical figures from one species or one laboratory should not be presented as a current universal efficiency rate. The available FDA assessments support a species- and protocol-specific view rather than one number that applies to all cloning.
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Dolly’s place in cloning history
The sheep Dolly was successfully cloned using SCNT in 1997. The FDA’s official page states: “SCNT was successfully used in 1997 to create the cloned sheep Dolly.” Dolly showed that a nucleus from a differentiated adult body cell could be reprogrammed to produce a viable mammal, a landmark result in developmental biology.
Dolly was a milestone, not evidence that cloning is routine or highly efficient in every species. The same technical challenges—nuclear reprogramming, embryo development, implantation and pregnancy health—still determine outcomes in each project.
What FDA concluded about food safety
In a final risk assessment issued in January 2008, the FDA concluded that meat and milk from cloned cattle, pigs and goats, and food from the offspring of those clones, were as safe as food from conventional counterparts. That conclusion is limited to the species and food products FDA assessed and should not be expanded into a universal claim about every cloned species or every country’s regulations.
FDA has said clones themselves are used mainly as breeding stock, so their offspring are more likely than the clones to enter the food supply. Food-safety policy can differ by jurisdiction, labeling system and product category; the 2008 FDA conclusion describes the agency’s assessment, not a worldwide rule.
Common points of confusion
Does the surrogate become the clone’s genetic mother?
Not in the nuclear-DNA sense used for SCNT. The surrogate carries the pregnancy and gives birth, but the transferred nucleus comes from the donor animal. The egg donor and surrogate still contribute important cellular or developmental environments, which is why “genetic copy” should not be interpreted as “every biological contribution came from the donor.”
Does cloning make a meat animal directly?
The principal livestock rationale described by FDA is reproducing valuable breeding animals. A clone may be used to produce offspring through ordinary mating, and those offspring are the animals more likely to enter food production.
Can cloning guarantee the donor’s performance?
No. Matching nuclear DNA does not guarantee identical growth, health, fertility, behavior or productivity. Conditions before birth and after birth can change the observed phenotype.
Is cloning the same as genetic engineering?
No. SCNT transfers donor nuclear material into an enucleated egg. Genetic engineering deliberately changes DNA. A project may use both techniques, but they remain distinct interventions.
Further reading
For a broad scientific discussion rather than a laboratory protocol, the National Academies report Animal Biotechnology: Science-Based Concerns, including its chapter on cloning, provides background on the technology and its implications. FDA’s resources A Primer on Cloning and Its Use in Livestock Operations, Animal Cloning: A Risk Assessment and Consumer FAQs: Animal Cloning explain the agency’s descriptions, welfare concerns and food-safety scope.
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