Experts Debate Genetic Testing’s Role in Social Equity

The ethical implications of commercial genetic testing are sparking a heated debate among experts. In the book *What We Inherit: How New Technologies and Old Myths Are Shaping Our Genomic Future*, authors Daphne O. Martschenko and Sam Trejo explore whether research in social genomics can foster social equity or exacerbate existing inequalities. Their differing viewpoints reflect broader concerns about how genetic data could be misused to justify societal disparities.

Martschenko, a bioethicist at Stanford University, argues that historical usage of genetic research has often reinforced social hierarchies. She believes that we already possess solutions to many societal issues, such as poverty, and that further genetic research is unnecessary for implementing these changes. Trejo, a sociologist at Princeton University, counters that increased knowledge can yield unforeseen benefits. He emphasizes the inevitability of genetic research and advocates for harnessing its potential for societal good.

The collaboration between Martschenko and Trejo, described as an “adversarial collaboration,” spans a decade. They have managed to understand each other’s perspectives while still holding differing views. This exchange is significant, as it underscores the need for dialogue in an era where genetic capabilities are rapidly advancing.

Understanding Genetic Myths and Polygenic Scores

Central to their discussion are two prevalent genetic myths: the Destiny Myth and the Race Myth. The Destiny Myth, originating from Francis Galton‘s 1869 work *Heredity Genius*, falsely posits that genetic influences can be isolated from environmental factors. This perspective has historically justified harmful practices, such as eugenics in the early 20th century.

The Race Myth, on the other hand, is the erroneous belief that distinct racial categories exist based on genetic differences. While genetic ancestry can provide insights, it does not support the notion of biologically separate human races. The authors caution against the dangers of such misconceptions, particularly in the context of polygenic scores.

Polygenic scores aggregate the effects of multiple genes to predict traits, but they are inherently probabilistic. These scores cannot definitively determine outcomes such as educational achievement or susceptibility to diseases; instead, they indicate likelihoods. Martschenko and Trejo highlight the limitations of polygenic scores, noting that their accuracy diminishes when predicting multiple traits and is particularly unreliable for non-European populations.

Regulating Genetic Technologies

Both authors agree on the urgent need for regulatory frameworks surrounding the generation and use of polygenic scores. They express concerns that while attention is focused on gene editing, practices like genetic embryo selection based on polygenic scores are advancing unregulated. Such technologies could lead to new forms of social inequality, where only affluent families can select for traits that may enhance their children’s success.

In 2020, the company Genomic Prediction began offering genomic scores for various traits, including the risk of diabetes and skin cancer. While some traits have clear genetic markers, others, like intelligence, remain controversial and poorly understood. As the market for these services expands, the potential for misuse grows.

Current regulations in the United Kingdom, Israel, and much of Europe prohibit polygenic embryo selection. In contrast, the FDA has made preliminary moves toward regulation but currently treats genetic testing services akin to nutritional supplements, which limits oversight. As a result, American consumers face a landscape dominated by corporations seeking profit from genetic information.

The disparity in access to genetic technologies raises concerns about exacerbating existing inequalities. Wealthy individuals, particularly those of European descent, are more likely to afford these advancements, potentially leading to a class of genetically optimized individuals. This trend could undermine societal diversity and perpetuate cycles of privilege.

As Martschenko and Trejo advocate for more comprehensive science education, they highlight the necessity of understanding genetics beyond traditional Mendelian concepts. The complexities of human traits demand a more nuanced approach to genetic research and its implications for society.

In summary, the dialogue between Martschenko and Trejo reflects a critical examination of the intersection between genetics and social equity. Their insights serve as a reminder that while genetic research holds promise, it must be approached with caution to avoid deepening existing social divides.