For the first time, scientists from the Oregon Health and Science University in the United States have successfully created genetically modified human embryos. Led by embryologist, Dr Shoukhrat Mitalipov a researcher at the university the team used the gene-editing technique CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) to introduce gene-editing chemicals to single-cell embryos.

The aim of the experiment was to target a gene associated with a significant human disease and see if the gene was modified.

This is the kind of research that is essential if we are to know if its possible to safely and precisely make corrections in embryos DNA to repair disease-causing genes, shares Alta Charo, a legal scholar and bioethicist at the University of Wisconsin.

Thus far, such experiments have only been conducted in China as scientists, religious organisations, civil society groups and even many biotechnology companies in America have been vehemently opposed to them.

However, the team was able to move forward with their experiment because of a report by the US National Academy of Sciences in February this year. The report agreed to laboratory research on germline modification as it argued, may one day be a way for parents with severe genetic disorders to have healthy, biological children.

But we anticipated that there would need to be a lot of research to see if you could make these changes without any unintentional effects, remarks Charo, who co-chaired the Academies committee.

The team chose to inject the CRISPR into eggs at the same time as they were fertilised by sperm. It was conducted in this way in order to avoid the pitfalls faced by the Chinese researchers. One pitfall was mosaicism, in which the desired DNA changes are taken up by only some of the cells in the embryo, not all; and the second are off-target effects, in which genes that were not meant to be edited, are.

It is proof of principle that it can work. They have significantly reduced mosaicism. I dont think its the start of clinical trials yet, but it does take it further than anyone has before, comments a scientist familiar with the project.

This is important as much of the criticism against germline engineering has been the concern that errors such as mosaicism and off-target editing make CRISPR an unsafe way to create human beings.

Although none of the embryos were permitted to develop for more than a few days and the team had no intention of implanting the embryos into a womb news of the experiment has brought to the forefront again, conversation around designer babies. An example situation would be in China, where more and more parents are opting for genetic testing in order to uncover their childs talents.

Genome editing to enhance traits or abilities beyond ordinary health, raises concerns about whether the benefits can outweigh the risks, and about fairness if available only to some people, explains Charo.

Additionally, because changes that are made to the embryos cells will also be found in the eggs or sperm that will be produced if the embryo is allowed to develop into an adult human, any children the person has will also inherit the changes.

This ability to change human evolution has triggered fears. However, Stanford University law professor and bioethicist Hank Greely responds that the key point is that the team did not implant any edited embryos. He argues that research embryos that are not to be transferred for possible implantation are not a big deal.

In America, parliamentary government has prohibited using edited IVF embryos to make people and the Department of Health and Human Services has forbidden the technology to do so from reaching clinical trials.

While there will be time for the public to decide if they want to get rid of regulatory obstacles to these studies, I do not find them inherently unethical, expresses Charo.

Indeed, for now, small, correctly-performed experiments such as Mitalipovs does beg the question: whether Charlies Gards situation would have been different had his parents had access to CRISPR technology. MIMS

Read more:What does the artificial womb mean for the future of fertility and neonatal care?Worlds first human-pig hybrid: Medical breakthrough or ethical dilemma?Male infertility boosts financial equity of the reproductive health industry in ChinaSources:https://www.technologyreview.com/s/608350/first-human-embryos-edited-in-us/https://www.statnews.com/2017/07/26/human-embryos-edited/http://www.sciencemag.org/news/2017/07/first-us-team-gene-edit-human-embryos-revealed

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American scientists use CRISPR to modify human embryos - MIMS General News (Hong Kong) (registration) (blog)