Using the back-casting method to back our research into our future scenario. Looking at how genetic modification exists today and how it could progress in the future:

“Newly fertilized eggs before gene editing, left, and embryos after gene editing and a few rounds of cell division. A study published on Wednesday announced that edited human embryos can repair common and serious disease-causing gene mutations.”
Scientists in the USA have successfully used genetic modification to alter genes in human embryos. The clinical research was a huge achievement for modern day science and marks a major milestone as the scientists were able to repair the probability of disease-causing mutation.