Recently, researchers at Washington University school of Medicine in St Louis announced that they had corrected a genetic mutation in a fish embryo prior to birth. More importantly, they announced that the research could lead to the prevention of up to one fifth of birth defects in humans caused by genetic mutation.
While I will avoid the over discussed topic of when does an embryo become a human, it made me wonder whether we would be actively interfering in human evolution. One of the precepts of evolution is that mutation id often occurring as a form of trial and error in which we bring about new and improved (read more successful) forms of life. Now, I do think a portion of the creationist argument against human evolution is the notion that we might continue to evolve. Afterall, if we are already in God’s image, how can that be improved upon?
But even with the massive success of homo sapiens on this planet, nothing seems to assure us that a sudden mutation may not offer some improved form of human (the variety of possible mutations is huge). Additionally, as we go on to explore and possibly colonize other planets, the mutative effects of lesser gravity and increased radiation will forcibly engender changes in the humans born under those conditions. If they are to survive, I suppose the ones with improved adaptability will be displaying some features or functions that will help them be more successful in their environment. Remember that Darwin claimed that evolutionary success was not about survival of the strongest or smartest, but of those most able to adapt. In fact, although it may be difficult to imagine, a dumber human that had other attributes that permitted for better survival might be an evolutionary improvement from Darwin’s point of view.
What the Washington U announcement got me thinking was what if we use this wonderous medical break-through to put a halt to hap hazard mutational changes.
Despite the political will to try to stop people from experimenting with stem cells and human genetic manipulation, it is rather unrealistic to imagine that it will not occur (even though we may legally declare that a genetically modified human is not a human , much the same way certain European politicians are trying to do with GM corn).
So, if humans begin to prevent mutations and actively change themselves, does that mean evolution (in the traditional format that we have come to know and argue about) is coming to an end or are we just about to begin.
To add a little extra thought to this, remember that dogs as a species are only about 10,000 years old (obviously human developed from wolves) and that the vast majority of dog breeds are less than 500 years old. We are not strangers to altering the evolution of life forms.
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