Episode Summary
Executive Summary: Michael Shermer and Matthew Cobb discuss Cobb’s book As Gods, tracing the history, ethics, and public fears around genetic engineering from recombinant DNA and Asilomar to CRISPR, GM crops, IVF, gene drives, and human embryo editing. Cobb argues that many early doomsday fears were overstated, but cautions that heritable human editing remains ethically and technically risky, especially given inequality and unintended consequences.
Main Topics: History of genetic engineering and Asilomar: Cobb explains how recombinant DNA research, public alarm, and the Asilomar conference shaped modern biosafety norms and helped legitimize genetic engineering without fully confronting ethical issues like human enhancement, ecology, and bioweapons. Why the worst fears often did not materialize: He argues that early fears about engineered microbes, human transgenes, and runaway catastrophe were tempered by biological complexity, technical limits, and biosecurity protocols that made many proposed threats less feasible than critics imagined. GM crops, food politics, and public distrust: The discussion explores why GM food became a cultural flashpoint, especially in Europe and China, and how concerns about purity, food, globalization, and labeling often mattered more than scientific evidence of harm. CRISPR, gene editing, and embryo ethics: Cobb distinguishes somatic gene therapy from heritable embryo editing, arguing that embryo editing is rarely justified, technically dangerous, and likely unnecessary given existing options such as preimplantation selection. Epigenetics, behavior genetics, and human variation: The speakers examine heritability, twin studies, epigenetics, and the limits of genetic determinism, emphasizing that genes matter but do not straightforwardly determine complex traits, behavior, or identity. Personalized medicine and practical uses of genetics: Cobb highlights the promise of genetic medicine for blood diseases, cancer, cholesterol, and drug response, while stressing that simple interventions like statins, vaccines, and public health can outperform glamorous genetic fixes. Science, fiction, and cultural narratives of fear: They reflect on why novels and films overwhelmingly dramatize genetic catastrophe rather than beneficial science, and how cultural anxieties about science, control, and purity shape public reception of new technologies.
Key Arguments: Early fears about recombinant DNA were not entirely irrational, but many proved overstated because bacteria, viruses, and cells are biologically more constrained and complex than alarmists assumed. Asilomar was valuable for establishing biosafety norms, but it avoided discussing human genetic engineering, environmental consequences, and bioweapons—topics that later became real concerns. GM crops became politically controversial less because of proven health harms and more because of food purity, globalization, corporate power, and distrust of institutions. Gene editing is technically far more precise than older GM methods, but precision is not guaranteed; CRISPR can cause major unintended damage if used in the wrong cellular context. Heritable embryo editing is especially problematic because existing IVF plus embryo selection already helps many families, while true editing remains risky and often unnecessary. Somatic gene therapy has genuine promise for diseases such as sickle cell and certain cancers because those changes are not inherited and can target specific tissues. Behavioral traits are heritable in the broad sense, but heritability does not mean genetic destiny; most complex traits reflect many genes, environment, and chance. Epigenetics is real as gene regulation, but strong claims that trauma or life experience are routinely inherited across human generations are overstated. The most effective health interventions are often simple, cheap, and public-health oriented—statins, vaccines, clean water, sanitation—rather than cutting-edge genetic engineering.
Data Points: Podcast episode count: 300+ episodes - Shermer notes the show has reached over 300 episodes. Wondrium promotion: 2 years for the price of 1 - Shermer advertises a subscription deal for listeners. Asilomar meeting year: 1975 - Cobb discusses the key conference that shaped recombinant DNA biosafety norms. Moratorium start: 1974 - He says a worldwide pause on recombinant DNA work was obeyed before Asilomar protocols resumed research. BBC podcast format: 3 parts - Cobb mentions making a three-part BBC podcast on the book’s themes. Human genes in bacteria concern: 1977 - Cobb notes the technical discovery that eukaryotic genes are interrupted by noncoding sequences, undermining a key early fear. Soviet delegation size: 5 people - At Asilomar, Cobb says a five-person Soviet delegation attended the meeting. Soviet bioweapons program duration: 18 years - He says parts of the Soviet delegation were already involved in a genetic-engineering-based bioweapons effort that continued until the USSR collapsed. Genentech public offering: 1980 - Boyer’s company went public and made him a multimillionaire. First commercial GM crop: Flavor Saver tomato - Cobb cites the tomato as an early U.S. commercial GM crop. Mad cow disease deaths: About 200 - He references deaths from contaminated British beef linked to BSE. Human genome protein-coding genes: ~20,000 - Cobb uses this to explain why gene effects are distributed and complex. Gene count for eye color: Over 60 genes - He argues that producing a specific eye color is far more complex than a single-gene model suggests. Down syndrome-carrying chromosome: 1 extra chromosome 21 - Discussed in the context of embryo screening and prenatal testing. Heritable embryo-editing cases: A few hundred couples worldwide (estimate) - He cites estimates for couples who might actually need embryo editing rather than embryo selection. CRISPR anniversary mentioned: 10 years - Cobb references the decade since the 2012 Doudna-Charpentier paper. Twin-study sample: All Caucasian men in the UK - Cobb describes an alcohol/twin study he worked on as intentionally narrow in scope. Malaria vaccine efficacy: 80% - He cites a WHO-approved malaria vaccine with about 80% efficacy.
Pivotal Quotes: "We will create a perfect race" — Michael Shermer (quoting protest sign at AAAS meeting): Used to illustrate early public fear and Nazi comparisons surrounding recombinant DNA research. "Who needs this?" — Matthew Cobb: His critique of heritable embryo editing: if existing selection methods work for most cases, why risk dangerous genome manipulation? "We live in a world in which we don't have equal access to eyeglasses." — Matthew Cobb: Used to argue that genetic medicine will be shaped by inequality, making equitable access a major concern.
Implications: Listeners should expect major benefits from somatic gene therapy and precision medicine, but heritable embryo editing remains ethically fraught and technically risky. The biggest near-term challenge is ensuring that genomic advances improve health without worsening inequality or reviving eugenic thinking.