Bringing Extinct Species Back to Life | Dr. Beth Shapiro

Overview

This episode explores the groundbreaking work of Dr. Beth Shapiro, an evolutionary biologist and Chief Science Officer at Colossal Biosciences, in the field of de-extinction and wildlife conservation. The discussion delves into the use of ancient DNA and synthetic biology to bring back extinct species like the woolly mammoth, dodo bird, and dire wolf, while also addressing the ethical and ecological implications of these efforts. The conversation also touches on the broader applications of genetic engineering in human health, conservation, and ecosystem resilience.

Notable Quotes

- When we excite people with the idea of mammoths and dodos and thylacines, we get more engagement and investment in developing the technology that we can use to stop living species from becoming extinct. – Dr. Beth Shapiro, on the dual purpose of de-extinction.

- Doing nothing is not not deciding. Doing nothing is saying, we accept the fact that we are going to have a future that is less biodiverse than the present. – Dr. Beth Shapiro, on the ethical imperative of intervention.

- If it looks like a dire wolf and it's able to fill the niche of a dire wolf, I'm happy to call it a dire wolf. – Dr. Beth Shapiro, addressing debates around species nomenclature.

🧬 The Science of De-Extinction

- Dr. Shapiro explains how ancient DNA is sequenced from fossils to identify genetic traits that defined extinct species like the dire wolf, woolly mammoth, and dodo bird.

- These traits are then engineered into the genomes of closely related living species (e.g., gray wolves for dire wolves, Asian elephants for mammoths) to recreate animals capable of fulfilling the ecological roles of their extinct counterparts.

- The goal is not to perfectly replicate extinct species but to create functional proxies that can thrive in modern ecosystems.

🌍 Ecosystem Resilience and Conservation

- De-extinction is framed as a tool for restoring ecological balance. For example, reintroducing mammoth-like creatures to the tundra could help prevent permafrost thaw by altering vegetation and soil dynamics.

- The reintroduction of top predators, such as gray wolves in Yellowstone, has demonstrated the cascading benefits of restoring ecological balance, including healthier plant life and stabilized river systems.

- The thylacine (Tasmanian tiger) is another de-extinction target, as its absence has disrupted Tasmania’s ecosystem, contributing to issues like the spread of transmissible cancers in Tasmanian devils.

🐾 Dire Wolves and the Ethics of Synthetic Biology

- Colossal Biosciences successfully engineered dire wolf traits into gray wolves, creating animals with larger size, muscular builds, and light-colored coats.

- Ethical considerations include ensuring animal welfare and avoiding unintended ecological consequences. For example, edits were carefully selected to avoid traits that could cause blindness or deafness.

- Dr. Shapiro emphasizes the importance of public education and transparency to address fears and misconceptions about synthetic biology.

🦠 Genetic Rescue and Preventing Extinction

- Genetic rescue techniques, such as cloning and gene editing, are being used to save endangered species like the black-footed ferret and red wolf.

- For black-footed ferrets, cloning has been used to reintroduce genetic diversity from preserved tissue samples, while gene editing is being explored to make them resistant to diseases like plague.

- In Australia, synthetic biology has been used to modify the genome of northern quolls, enabling them to survive after eating toxic cane toads, an invasive species threatening their survival.

🤖 Artificial Wombs and Future Applications

- Artificial wombs are being developed to support de-extinction efforts, such as birthing mammoths without relying on Asian elephants as surrogates.

- This technology could have profound implications for human medicine, such as enabling premature babies to develop outside the womb or allowing pregnant individuals with health complications to safely deliver their babies.

- Dr. Shapiro highlights the potential of these innovations to address both conservation and human health challenges, emphasizing the need for careful ethical considerations and public dialogue.