Ever since scientists created the powerful gene editing technique Crispr, they have braced apprehensively for the day when it would be used to create a genetically altered human being. Many nations banned such work, fearing it could be misused to alter everything from eye color to I.Q.

Now, the moment they feared may have come. On Monday, a scientist in China announced that he had created the worlds first genetically edited babies, twin girls who were born this month.

The researcher, He Jiankui, said that he had altered a gene in the embryos, before having them implanted in the mothers womb, with the goal of making the babies resistant to infection with H.I.V. He has not published the research in any journal and did not share any evidence or data that definitively proved he had done it.

But his previous work is known to many experts in the field, who said many with alarm that it was entirely possible he had.

Its scary, said Dr. Alexander Marson, a gene editing expert at the University of California in San Francisco.

While the United States and many other countries have made it illegal to deliberately alter the genes of human embryos, it is not against the law to do so in China, but the practice is opposed by many researchers there. A group of 122 Chinese scientists issued a statement calling Dr. Hes actions crazy and his claims a huge blow to the global reputation and development of Chinese science.

If human embryos can be routinely edited, many scientists, ethicists and policymakers fear a slippery slope to a future in which babies are genetically engineered for traits like athletic or intellectual prowess that have nothing to do with preventing devastating medical conditions.

While those possibilities might seem far in the future, a different concern is urgent and immediate: safety. The methods used for gene editing can inadvertently alter other genes in unpredictable ways. Dr. He said that did not happen in this case, but it is a worry that looms over the field.

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Dr. He made his announcement on the eve of the Second International Summit on Human Genome Editing in Hong Kong, saying that he had recruited several couples in which the man had H.I.V. and then used in vitro fertilization to create human embryos that were resistant to the virus that causes AIDS. He said he did it by directing Crispr-Cas9 to deliberately disable a gene, known as CCR, that is used to make a protein H.I.V. needs to enter cells.

Dr. He said the experiment worked for a couple whose twin girls were born in November. He said there were no adverse effects on other genes.

In a video that he posted, Dr. He said the father of the twins has a reason to live now that he has children, and that people with H.I.V. face severe discrimination in China.

Dr. Hes announcement was reported earlier by the MIT Technology Review and The Associated Press.

In an interview with the A.P. he indicated that he hoped to set an example to use genetic editing for valid reasons. I feel a strong responsibility that its not just to make a first, but also make it an example, he told the A.P. He added: Society will decide what to do next.

It is highly unusual for a scientist to announce a groundbreaking development without at least providing data that academic peers can review. Dr. He said he had gotten permission to do the work from the ethics board of the hospital Shenzhen Harmonicare, but the hospital, in interviews with Chinese media, denied being involved. Cheng Zhen, the general manager of Shenzhen Harmonicare, has asked the police to investigate what they suspect are fraudulent ethical review materials, according to the Beijing News.

The university that Dr. He is attached to, the Southern University of Science and Technology, said Dr. He has been on no-pay leave since February and that the school of biology believed that his project is a serious violation of academic ethics and academic norms, according to the state-run Beijing News.

In a statement late on Monday, Chinas national health commission said it has asked the health commission in southern Guangdong province to investigate Mr. Hes claims.

Many scientists in the United States were appalled by the developments.

I think thats completely insane, said Shoukhrat Mitalipov, director of the Center for Embryonic Cell and Gene Therapy at Oregon Health and Science University. Dr. Mitalipov broke new ground last year by using gene editing to successfully remove a dangerous mutation from human embryos in a laboratory dish.

Dr. Mitalipov said that unlike his own work, which focuses on editing out mutations that cause serious diseases that cannot be prevented any other way, Dr. He did not do anything medically necessary. There are other ways to prevent H.I.V. infection in newborns.

Just three months ago, at a conference in late August on genome engineering at Cold Spring Harbor Laboratory in New York, Dr. He presented work on editing the CCR gene in the embryos of nine couples.

At the conference, whose organizers included Jennifer Doudna, one of the inventors of Crispr technology, Dr. He gave a careful talk about something that fellow attendees considered squarely within the realm of ethically approved research. But he did not mention that some of those embryos had been implanted in a woman and could result in genetically engineered babies.

What we now know is that as he was talking, there was a woman in China carrying twins, said Fyodor Urnov, deputy director of the Altius Institute for Biomedical Sciences and a visiting researcher at the Innovative Genomics Institute at the University of California. He had the opportunity to say Oh and by the way, Im just going to come out and say it, people, theres a woman carrying twins.

I would never play poker against Dr. He, Dr. Urnov quipped.

Richard Hynes, a cancer researcher at the Massachusetts Institute of Technology, who co-led an advisory group on human gene editing for the National Academy of Sciences and the National Academy of Medicine, said that group and a similar organization in Britain had determined that if human genes were to be edited, the procedure should only be done to address serious unmet needs in medical treatment, it had to be well monitored, it had to be well followed up, full consent has to be in place.

It is not clear why altering genes to make people resistant to H.I.V. is a serious unmet need. Men with H.I.V. do not infect embryos. Their semen contains the virus that causes AIDS, which can infect women, but the virus can be washed off their sperm before insemination. Or a doctor can inject a single sperm into an egg. In either case, the woman will not be infected and neither will the babies.

Dr. He got his Ph.D., from Rice University, in physics and his postdoctoral training, at Stanford, was with Stephen Quake, a professor of bioengineering and applied physics who works on sequencing DNA, not editing it.

Experts said that using Crispr would actually be quite easy for someone like Dr. He.

After coming to Shenzhen in 2012, Dr. He, at age 28, established a DNA sequencing company, Direct Genomics, and listed Dr. Quake on its advisory board. But, in a telephone interview on Monday, Dr. Quake said he was never associated with the company.

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Austin Ramzy contributed reporting from Hong Kong and Elsie Chen contributed research from Beijing.

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Chinese Scientist Claims to Use Crispr to Make First ...

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