Although the first steps in somatic gene therapy have already taken place, research on human germ-line gene therapy still remains taboo. However, the first protocol aiming to cure defective genes of mitochondria in germ cells has been published recently. Germ-line gene therapy is an entirely new method. Its effects and impact on future generations differ considerably from those of somatic gene therapy.

Over the past several decades, geneticists have succeeded in identifying the genetic mutations associated with disease. New strategies for treatment, including gene transfer and gene therapy, are under development. Although genetic science has been welcomed for its potential to predict and treat disease, interventions may become ethically objectionable if they threaten to alter characteristics that are distinctively human. Before we can determine whether or not a genetic technique carries this risk, we must clarify what it means to be “human”. This (...) paper inquires how “humanness” has been defined within various academic fields. The views of several legal theoreists, scientists, bioethicists, psychologists, philosophers and anthropologists whose works seem to best reflect how “humanness” is understood in their respective fields of study are considered. Our survey attempts to chart a path for a more detailed study on the meaning of “humanness” in the future. (shrink)