Editing the unhealthy cells of those suffering from genetic diseases such as Duchenne's muscular dystrophy and cystic fibrosis will alleviate their suffering.
This means genetic diseases such as haemophilia, muscular dystrophy and cancers, in principle, might be " corrected" by editing the DNA of human embryos.
Within that group, dystrophinopathies are the most common, which includes Duchenne muscular dystrophy, or DMD, and Becker muscular dystrophy, both of which result from mutations in the dystrophin gene.
Now, the fact that both Duchenne and Becker muscular dystrophy result from mutations in the same dystrophin gene means that they are " allelic disorders, "
And then you would be one of hundreds of millions of people with a genetic disease, such as sickle cell anemia or progeria or muscular dystrophy or Tay-Sachs disease.
Mutations in the dystrophin gene that lead to a loss of dystrophin leads to duchenne muscular dystrophy, whereas mutations in the dystrophin gene that leads to misshapen dystrophin leads to Becker muscular dystrophy.