6 Nov, 14 | by Iain Brassington
Guest post by David Shaw
Imagine that you’re in dire need of a new kidney. You’re near the top of the waiting list, but time is running out and you might not be lucky enough to receive a new organ from a deceased or living donor. But another option is now available: scientists could take some of your skin cells, and from them derive stem cells that can then be added to a pig embryo. Once that embryo is implanted and carried to term, the resulting pig will have a kidney that is a perfect genetic match to you, and the organ can be transplanted into your body within a few months without fear of immune rejection. Would you prefer to take the risk of waiting for an organ donated by a human, which would require you to take immunosuppressant drugs for the rest of your life? Or would you rather receive a “chimera organ”?
This scenario might seem far-fetched, but it is quite likely to be a clinical reality within a decade or so. Scientists have already used the same technique to grow rat organs inside mice, and it has also been shown to work in different types of pig. Although clinical trials in humans have not yet taken place, using these techniques to create human organs inside animals could solve the current organ scarcity problem by increasing supply of organs, saving thousands of lives each year in Europe alone. As illustrated in the example, organs created in this way could be tailored to the individual patient’s DNA, allowing transplantation without the risk of immune rejection. However, the prospect of growing organs of human origin within (non-human) animals raises several ethical issues, which we explore in our paper.
Although chimera organs are ‘personalised’ and unlikely to be rejected, one of the major concerns about using organs transplanted from animals is the risk of ‘zoonosis’ – the possibility that an animal virus might be transmitted along with the organ, resulting in a new disease that could cause a pandemic. more…