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In the field of biotechnology, cloning is the process of creating cloned organisms of cells and of DNA fragments. The artificial cloning of organisms, sometimes known as reproductive cloning, is often accomplished via somatic-cell nuclear transfer (SCNT), a cloning method in which a viable embryo is created from a somatic cell and an egg cell.
In January 2019, scientists in China reported the creation of five identical cloned gene-edited monkeys, using the same cloning technique that was used with Zhong Zhong and Hua Hua – the first ever cloned monkeys – and Dolly the sheep, and the same gene-editing Crispr-Cas9 technique allegedly used by He Jiankui in creating the first-ever ...
The technique is similar to SCNT cloning which typically is between domestic animals and rodents, or where there is a ready supply of oocytes and surrogate animals. However, the cloning of highly endangered or extinct species requires the use of an alternative method of cloning.
Zhong Zhong and Hua Hua are usually described as the first cloned monkeys. However, a rhesus monkey was cloned in 1999 using what researchers consider a simpler cloning method. In that case ...
While pet cloning is sometimes advertised as a prospective method for re-gaining a deceased companionship animal, [40] pet cloning does not result in animals that are exactly like the previous pet (in looks or personality). [41] Although the animal in question is cloned, there are still phenotypical differences that may affect its appearance or ...
Molecular cloning generally uses DNA sequences from two different organisms: the species that is the source of the DNA to be cloned, and the species that will serve as the living host for replication of the recombinant DNA. Molecular cloning methods are central to many contemporary areas of modern biology and medicine. [2]
Newer and more efficient methods of site directed mutagenesis are being constantly developed. For example, a technique called "Seamless ligation cloning extract" (or SLiCE for short) allows for the cloning of certain sequences of DNA within the genome, and more than one DNA fragment can be inserted into the genome at once. [2]
The creation of HIV-resistant babies by Chinese researcher He Jiankui is perhaps the most famous example of gene disruption using this method. [68] It is far less effective at gene correction. Methods of base editing are under development in which a “nuclease-dead” Cas 9 endonuclease or a related enzyme is used for gene targeting while a ...