Why are human eggs difficult to obtain for somatic cell nuclear transfer research?

Human eggs are difficult to obtain for somatic cell nuclear transfer (SCNT) research due to a combination of technical, ethical, and legal challenges.

• High Demand and Low Supply: The SCNT process is inefficient and often requires more than a dozen human eggs to successfully produce a single embryonic stem cell line.1
• Ethical and Legal Concerns: Procuring human eggs specifically for research purposes is a subject of significant controversy. Many individuals and groups object to the practice because it involves the creation and subsequent destruction of human embryos. There is also a strong ethical imperative to ensure that women and couples are not exploited during the donation process.23
• Regulatory Restrictions: Due to these moral concerns, many jurisdictions have implemented strict regulations or prohibitions regarding the use of human embryos in research. For instance, in the United States, federal funding cannot be used for research that involves the destruction of human embryos.3

These factors have made the acquisition of eggs a major bottleneck in therapeutic cloning research, leading scientists to explore alternatives such as induced pluripotent stem cells.2