Gene editing modifies DNA allowing custom DNA to be implanted or taken out. CRISPR-Cas9 is a more advanced method that makes use of a naturally occuring bacteria function to fight viruses by targeting the known DNA and disabling it. Researchers are making use of this process and replicating it through lab usage.
Somatic cells are being targeted in treatment which does not pass traits of CRISPR editing. Ethics begin to come into play as CRISPR begins to edit germline cells or the embryo.