Modification of the human germ line has remained a distant but valuable objective for most biologists since the emergence of genetics (and even before). To study the historical transformations of this project, I have selected three periods - the 1930s, at the pinnacle of eugenics, around 1974 when molecular biology triumphed, and today - and have adopted three criteria to estimate the feasibility of this project: the state of scientific knowledge, the existence of suitable tools, and societal demands. Although the long-awaited techniques to modify the germ line are now available, I will show that most of the expectations behind this project have disappeared, or are considered as being reachable by highly different strategies.
Keywords: Amélioration de l’être humain; Biologie moléculaire; Eugenics; Eugénisme; Genome editing; Homologous recombination; Human enhancement; Molecular biology; Recombinaison homologue; Édition du génome.
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