Is There a Limit to Cloning? A 20-Year Mouse Study Says Yes

🧬 Is There a Limit to Cloning? A 20-Year Mouse Study Says Yes

For over two decades, Teruhiko_Wakayama and his team at University of Yamanashi conducted one of the longest cloning experiments ever.

👉 Starting from a single mouse, they created 58 successive generations and over 1,200 cloned animals.

At first, everything looked normal:
✔️ Early generations were healthy
✔️ Lifespan remained comparable to natural mice

But beneath the surface, biology told a different story.

🔬 What actually happened?

- After ~25 generations, mutation accumulation increased significantly
- Large genetic abnormalities appeared (even loss of entire chromosomes)
- Cloning success rate dropped drastically over time
- By the 58th generation, cloning failed to produce viable offspring

📉 This phenomenon is known as “mutational meltdown”, where harmful DNA changes accumulate without the corrective mechanism of sexual reproduction

💡 Key Insight:
Mammalian cloning is not indefinitely sustainable.
Unlike natural reproduction, cloning lacks genetic recombination to remove harmful mutations.

🚨 Why this matters:

- Limits the idea of cloning for endangered species conservation
- Raises concerns for livestock mass replication
- Reinforces the biological importance of sexual reproduction in maintaining genomic stability

👉 Science didn’t fail here—it revealed a fundamental rule:
Replication without variation eventually breaks down.

Reference :- Nature 652, 14-15 (2026) doi: https://doi.org/10.1038/d41586-026-00945-7

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