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Why is somatic cell nuclear transfer expensive and inefficient for de-extinction?
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de-extinction
The woolly mammoth (Mammuthus primigenius)—represented here by a replica in a Canadian museum—is an example of an extinct species that someday could be resurrected through de-extinction.
Somatic cell nuclear transfer (SCNT) is considered expensive and inefficient for de-extinction due to several technical and biological challenges:
- High Resource Requirements: The process often requires a large number of donor eggs to produce even a single viable embryo, which is costly and logistically difficult to manage.1
- Reprogramming Complexities: The mechanism by which the cytoplasm of an enucleated egg reprograms the DNA of a fully differentiated somatic cell is not entirely understood. This lack of complete biological control leads to high failure rates during embryonic development.12
- Developmental Risks: Cloned embryos frequently suffer from severe defects, as evidenced by the 2009 attempt to resurrect the Pyrenean ibex, where the clone died shortly after birth due to lung complications.2
- Surrogate Limitations: SCNT requires a surrogate mother from a closely related species to carry the embryo to term. Finding and maintaining suitable surrogates for extinct species adds significant complexity and expense to the process.2
These factors raise serious questions about the practicality of using SCNT as a reliable tool for large-scale species resurrection.2