Overseas researchers have called this risky and unethical. Thus far the response within China has been to condemn and criticize his work.
By using a method called Crispr-Cas9, Mr He was able to target specific blocks of DNA with pinpoint precision.
Doudna, a scientist at the University of California, Berkeley and one of the Hong Kong conference organizers, said that He met with her Monday to tell her of his work, and that she and others plan to let him speak at the conference on Wednesday as originally planned.
A screen shows information of genomic data while He Jiankui, a Chinese researcher, speaking during the Human Genome Editing Conference in Hong Kong, Wednesday, Nov. 28, 2018.
Prof He's university - the Southern University of Science and Technology in Shenzhen - said it was unaware of the research project and would launch an investigation.
"The biomedical ethics review for this so-called research exists in name only".
Following He's revelations, Chinese authorities denounced his work and ordered a probe into his trials. CCR5 is naturally absent in about 1 percent of Europeans, leaving them essentially immune to HIV. Disabling this single gene helps to "shut the doorway" through which HIV can enter and infect cells, although it's worth noting that the twins were born healthy and not infected with HIV.
"None of the reported work has gone through the peer review process", and the conference is aimed at hashing out important issues such as whether and when gene editing is appropriate, she said.
The researcher meant to delete both copies of the CCR5 gene, but one of the twins still has a single copy of the gene, so she will not have any extra protection against HIV.
We have little to no details on how this was performed and we must take these reports with a lot of caution.More news: How A Gender-Reveal Stunt Sparked A Massive Wildfire
3d illustration of CRISPR-Cas9 technology.
"There may be unintended consequences". He also raised the possibility of a third child being born, after announcing that a separate woman was pregnant at an early stage with a modified embryo.
Globally speaking, the field is so new and cutting edge that experts simply don't know the full impact and risk involved for a gene edited embryo as it develops into adulthood, and how changed DNA might pass into future generations.
Controversially, in the study being discussed, the edit does not cure a pre-existing disease, and we already have existing alternatives to prevent HIV infection and limit its clinical progression to AIDS.
One of many areas of confusion about Dr. The first modification of human embryos was reported by another Chinese team in May 2015.
Other sponsors of the three-day conference are the Academy of Sciences of Hong Kong, the Royal Society of the United Kingdom and the U.S. National Academy of Sciences and U.S. National Academy Sciences.
Based on the information now available, it is hard not to consider this latest experiment as anything but an attempt to win a "race" and grab attention. He then returned to his homeland China to open a laboratory at Southern University of Science and Technology.
Facing a packed auditorium of scientists and members of the media, He also acknowledged that he had not made his university in China aware of the research he was doing.
If his claims prove to be true, it would be a medical first.