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Serial bull cloning by somatic cell nuclear transfer.
Chikara Kubota1, X Cindy Tian, Xiangzhong Yang
1Laboratory of Cell Genetics and Embryo Transfer, Kagoshima Prefectural Cattle Breeding Development Institute, Japan.
Nature Biotechnology
|May 25, 2004
Summary
Serial cloning was achieved in cattle, with two healthy second-generation clones born. However, attempts to produce a third generation were unsuccessful, indicating limitations in cattle cloning.
Area of Science:
- Animal cloning and reproductive technologies.
- Mammalian developmental biology.
- Genetics and epigenetics.
Background:
- Serial cloning, or cloning from cloned animals, has been limited to mice.
- Successful cloning in livestock is crucial for agricultural applications.
- Understanding the long-term viability and health of cloned animals is essential.
Purpose of the Study:
- To investigate the feasibility of serial cloning in cattle.
- To assess the health and developmental potential of cloned cattle across generations.
- To determine the success rate of producing second-generation clones from first-generation clones.
Main Methods:
- Somatic cell nuclear transfer (SCNT) was used to produce first-generation clones.
- Reproductive technologies were employed to breed first-generation clones and produce second-generation clones.
- Health assessments and telomere length analyses were performed on cloned animals.
Main Results:
- Two live births of second-generation cloned cattle were achieved.
- Both first and second-generation clones exhibited normal health and telomere lengths.
- Attempts to produce a third generation of clones were unsuccessful.
Conclusions:
- Serial cloning is feasible in cattle, extending beyond mice.
- Cloned cattle can maintain normal health and telomere length across at least two generations.
- Further research is needed to overcome limitations in achieving subsequent generations of clones.