Genetic engineering of human embryos raises sharp ethical concerns

Signal of change / Genetic engineering of human embryos raises sharp ethical concerns

By Joy Green / 05 May 2015

Genetic engineering research is currently moving swiftly, aided by the recent development of the powerful gene-editing tool CRISPR-Cas9. This allows for a ground-breaking level of precision in the alteration of DNA, down to the level of a single letter in some cases. CRISPR is already being hailed as a potential means to perform gene therapy on people with devastating genetic illnesses such as sickle-cell anaemia. This is not generally considered to be controversial as such gene therapy would not affect the germ line – egg or sperm cells – and the gene-editing effects would not be passed down to future generations.


However, several research teams are currently working on research that ‘crosses the germ line’ by performing gene editing experiments on human eggs and sperm to see if faulty genes can be replaced. And a team in China has gone a step further and has actually used CRISPR to edit human embryos obtained from an IVF clinic. Although the experiment was not successful, and the embryos used were already non-viable, the ethical issues around this research have been strongly highlighted.


Several countries have banned germ-line engineering; the EU’s convention of human rights and biomedicine calls it a crime against human dignity and human rights, as it involves altering a person’s DNA without their consent. The USA does not ban it, but several leading scientists are calling urgently for a moratorium in the wake of this research.


Jennifer Doudna, one of the co-discoverers of CRISPR, is one of the scientists asking for a global pause for reflection and debate. “It cuts to the core of who we are as people, and it makes you ask if humans should be exercising that kind of power,” she told MIT Review. “There are moral and ethical issues, but one of the profound questions is just the appreciation that if germ-line editing is conducted in humans, that is changing human evolution.”


“Most of the public,” she says, “does not appreciate what is coming.”

So what?

The speed at which gene-editing technology is developing is far outstripping the pace at which society can reflect on its impact and make considered decisions. Another of the scientists mentioned above remarked that he never imagined that he would have to take a position on genetically modified babies so soon.


However even though a moratorium has been called for, the genie is already out of the bottle to some extent, as many countries (including China) do not regulate germ-line engineering. An effective moratorium will have to rely on the good will of thousands of scientists worldwide who already have access to CRISPR. Many of these scientists feel that further germ-line research is justified in the name of preventing genetic diseases and reducing suffering. And there are others who are interested in germ-line therapy for enhancement purposes – there are specific genes that are thought to confer benefits such as incredibly strong bones, and even increased longevity.


The most concerning aspect of germ-line engineering is the long term societal effect – as any changes and unforseen consequences will continue to be passed on to future generations. This is what urgently needs to be debated while there is still time to regulate the technology. Wider effects also need to be considered, as under current healthcare structures this type of technology is likely to exacerbate inequality even further between the rich and the poor.


MIT Technology Review (2015, March 5) Engineering the perfect baby

The Wall Street Journal (2015, April 23) Chinese manipulation of human embryo genes draws rebuke

Image credit: BASF

What might the implications of this be? What related signals of change have you seen?

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