DMD is caused by a mutation resulting in a transposable element. Retroviruses are TEs by definition. And, a large fraction of human DNA is ERVs, and some have

DMD is caused by a mutation resulting in a transposable element. Retroviruses are TEs by definition. And, a large fraction of human DNA is ERVs, and some have become repurposed as functional proteins. Heck, some ERVs are reactivable. LINE1 is interesting in that we likely gave it to gonorrhea in some circulating strains by horizontal gene transfer within the past 20 years.