Designing Preclinical Studies in Germline Gene Editing: Scientific and Ethical Aspects

Area of Science:

• Genetics
• Bioethics
• Reproductive Medicine

Background:

• Human germline gene editing (HGGE) discussions often focus on hypothetical ethical acceptability post-safety and efficiency.
• This paper addresses the practical challenge of reducing uncertainty regarding HGGE safety and efficiency for clinical trial initiation.

Purpose of the Study:

• To define the necessary preclinical study designs for justifying first-time human germline gene editing clinical trials.
• To establish criteria for preclinical investigations to adequately reduce uncertainty about safety and efficiency.

Main Methods:

• Proposes multispecies and multigenerational animal studies as essential components of preclinical research.
• Advocates for human embryo gene editing studies (without implantation) that mirror animal study designs.
• Emphasizes strict validity conditions for animal studies to ensure translatability.

Main Results:

• Well-designed preclinical studies are the sole pathway to reduce uncertainty about HGGE safety and efficiency.
• Multispecies, multigenerational animal studies and human embryo editing are identified as critical investigations.
• Translational validity requires animal studies to meet strict conditions and embryo studies to align in experimental design.

Conclusions:

• Initiation of first-time HGGE clinical trials requires preclinical evidence reducing uncertainty about safety and efficiency to a modest level.
• Failure to adequately reduce uncertainty through rigorous preclinical studies should preclude the initiation of clinical trials.
• The proposed preclinical framework aims to ensure responsible advancement of germline gene editing technologies.