De-extinction in the Ice: Mammoths, Ancient-DNA and the Future of Genome Engineering

Short Summary

The Naked Scientists explore how nature’s deep freeze preserves DNA and other biomolecules, from mammoths in permafrost to seeds buried in seed vaults. The episode highlights the ambition to resurrect mammoths by extracting core genes from 1.3 million years of mammoth genomes and engineering them into Asian elephants, using somatic cell nuclear transfer and multiple genome edits. It also covers plant revival from ancient seeds, seed banking strategies to safeguard biodiversity, and the microbial life trapped in glacial ice, including the genome recycling concept and the potential but limited risk of pathogens. The conversation features experts Ben Lamb of Colossal Laboratories, plant scientist Jem Bromley, and glacier microbiologist Arwen Edwards, weaving science, technology, and conservation together.

Medium Summary

The podcast opens by framing the central theme: what sits in nature's deep freeze and what we can do with it. Permafrost has preserved biological material for tens of thousands to over a million years, offering a window into ancient genomes and biology. The host introduces the week’s focus on the elements of life stored in ice, from macro scale megafauna to microbes at the micro end, and promises discussions on bringing life back from the deep freeze.

First, the show examines mammoths as a case study in de-extinction ambitions. In 2010, a perfectly preserved mammoth named Yuka was found in the Arctic permafrost, with intact tissues and even traces of RNA in recoverable condition. Ben Lamb, representing Colossal Laboratories and Biosciences, explains how researchers have sequenced a host of mammoth genomes and compared them to living Asian elephants to identify the key genetic differences that defined the mammoth’s distinctive traits such as thick fat layers and small ears. The plan is to engineer these mammoth-specific genes into the Asian elephant genome, with the ultimate aim of producing mammoths that carry the hallmark characteristics that allowed them to thrive in the mammoth steppe.

We learn about the genetic editing process. Researchers have already edited over 25 different genes into the Asian elephant genome, moving beyond the initial target list of about 65 edits to a projected 85–90 edits for the first mammoth. The next step involves creating an edited mammoth-like genome in an elephant egg, and then attempting to implant it into a surrogate Victorian era approach, i.e., somatic cell nuclear transfer. The program notes that elephant IVF and pregnancy are more complex than in model organisms, and trials are underway with non-reproductive, infertile females to develop viable reproductive techniques that could also support elephant conservation efforts.

Beyond the mammoth project, the episode broadens to plant and microbial life. Plant scientist Jem Bromley discusses revived seeds from long-dormant seeds, including campion seeds recovered from Siberian permafrost that aged around 30,000 years. The episode explains that seeds can act as time capsules, remaining viable under the right conditions, though not always successfully germinating due to internal damage. The Millennium Seed Bank and the Svalbard Global Seed Vault are highlighted as strategic efforts to preserve plant diversity against extinction, using permafrost to stabilize seeds when power fails.

The discussion then shifts to microbial life in ice. Arwen Edwards from Aberystwyth describes collecting ice cores from Greenlandic and Svalbard glaciers, then melting and filtering to study bacteria and viruses preserved in ice. The concept of genome recycling is introduced: many microbes may be dead, but their DNA could persist and be acquired by modern organisms when glaciers retreat. The team uses sterile methods and sequencing to map the genetic material present, revealing thousands of microbial species with diverse metabolic capabilities, including methane producers at glacier beds.

The podcast also addresses biosafety and ethical considerations. The team notes that while ancient viruses might be expected to lurk in ancient ice, natural conditions often inactivate them; evidence from 1918 influenza virus studies in nearby regions found no viable virus, suggesting that the risk of reintroducing deadly pathogens is low under natural permafrost dynamics. The host emphasizes responsible science communication and the importance of conservation-oriented goals when pursuing such ambitious projects.

In closing, the program foreshadows moves in timekeeping, with Friday’s top science news and a discussion about time itself, followed by a call for donations to support Naked Scientist programming. The episode merges cutting-edge genetic engineering with practical biodiversity protection, signaling both the potential and the caveats of using natural archives to guide future science.

Quotes

"There is a spectrum rather than a binary kind of situation" - Arwen Edwards

"Seeds are like a little pool of dormant genetic material that can persist and remain viable for thousands of years" - Jem Bromley

"We will be the first to ever clone an elephant" - Ben Lamb

"they store them in vaults buried deep into the permafrost" - Jem Bromley