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20-Year Study Finds Mammal Cloning Hits Genetic Dead End After 58 Generations
A 20-year study found that 58 generations of serial cloning in mice cause fatal genetic mutations, confirming limits to mammal cloning and highlighting the role of sexual reproduction.
- On Tuesday, University of Yamanashi researchers published a study in Nature Communications revealing a genetic limit to serial mouse cloning after a 20-year experiment producing more than 1,200 mice over 58 generations.
- Developmental biologist Teruhiko Wakayama and his team found that while the first 25 generations appeared healthy, deleterious genetic mutations gradually accumulated, eventually triggering fatal defects in later generations.
- Genetic analysis revealed chromosomal abnormalities, including X chromosome loss, occurred at rates three times higher than in natural mating, supporting Muller's ratchet theory that asexual lineages inevitably accumulate fatal mutations.
- Despite appearing physically normal at birth, the 58th generation of clones died within days due to accumulated mutations, confirming that mammals cannot sustain their species through cloning alone.
- The study concludes sexual reproduction is indispensable for long-term mammalian survival, as researchers now seek new methods to fundamentally improve nuclear transfer technology.
21 Articles
21 Articles
After two decades of experimentation, Japanese researchers have shown for the first time that there is a biological limit to mammal cloning in a study published on Tuesday 24 March.
Mouse study shows repeated cloning causes grave genetic mutations
Revealing the limitations of cloning, researchers who repeatedly cloned mice for two decades have discovered that such serial duplication triggers grave genetic mutations that accumulate over the generations and ultimately become fatal.
The Independent
The Independent (US)Scientists tried to clone mice indefinitely – and made a grave discovery
Scientists cloned 1,206 mice from one female donor over 20 years to test the limits of cloning
The Cloning Conundrum: Genetic Mutations Imperil Serial Cloning of Mice | Science-Environment
A two-decade study on serially cloned mice revealed that repeated cloning causes grave genetic mutations to accumulate, eventually leading to fatal consequences. The research challenges the notion of indefinite cloning without consequences and underscores the importance of sexual reproduction in mammals.
For 20 years a group of researchers from the Advanced Biotechnology Center at Yamanashi University in Japan has carried out an unprecedented pioneering experiment that tests the known limits of mammalian cloning. The team, led by Teruhiko Wakayama, a leader in cloning for decades, has managed to create 1,200 serial mice for 58 consecutive generations from a single donor mouse.
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