Story perspectives

Study Reveals Genetic Limits to Mammal Cloning Success

3/25/2026

Summary

Story summary

A team of Japanese researchers identified a genetic limit to mammal cloning in mice, with mutations by 58th generation causing high mortality.
The study, published in Nature Communications, shows that initial clone generations appeared healthy.
Using trichostatin A, researchers achieved a 5.4% success rate for 51st generation clones.
They concluded that harmful genetic variations outweighed adaptive benefits, and offspring from late-generation clones mated with normal mice showed improved placental health.

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Story summary

A team of Japanese researchers identified a genetic limit to mammal cloning in mice, with mutations by 58th generation causing high mortality.
The study, published in Nature Communications, shows that initial clone generations appeared healthy.
Using trichostatin A, researchers achieved a 5.4% success rate for 51st generation clones.
They concluded that harmful genetic variations outweighed adaptive benefits, and offspring from late-generation clones mated with normal mice showed improved placental health.