Scientists have successfully assembled the most comprehensive genome of the Tasmanian tiger, or thylacine, bringing the extinct creature tantalizingly closer to being revived.
This achievement, spearheaded by Colossal Biosciences, was made possible by sequencing DNA extracted from a 110-year-old preserved specimen. The resulting near-complete genetic code delivers an unprecedented foundation for the company’s ambitious de-extinction goals.
Breakthrough in Genome Sequencing Accuracy
The team utilized a thylacine head preserved in ethanol for over a century, which maintained high-quality DNA and RNA, enabling reconstruction of long genetic sequences. This detailed genetic mapping revealed the activity of specific genes across different tissues during the animal’s lifetime. Andrew Pask, a genetics professor at the University of Melbourne and project lead, said, “Having an extremely detailed and high-quality genome is vital as it forms the core blueprint to bring this species back.”
The genome spans about 3 billion base pairs, a size comparable to the human genome. Though the sequence has minor gaps—45 small regions yet to be resolved—the researchers are optimistic about completing it soon with additional genomic sequencing efforts. Ben Lamm, Colossal’s co-founder and CEO, emphasized the urgency, stating, “We’re working at full speed to develop the science that will make extinction a relic of the past.”
This accomplishment not only sparks hope for the thylacine’s resurrection but also marks a milestone in the broader field of de-extinction, where similar projects seek to revive creatures like the woolly mammoth and dodo.
Gene Editing Paves Way for Species Resurrection
At the core of Colossal’s strategy to revive the thylacine is advanced gene editing. Scientists plan to alter the genome of the fat-tailed dunnart—the closest living relative of the thylacine—to engineer a surrogate species. The evolutionary proximity between the two marsupials makes the dunnart an ideal genetic platform for this work.
By leveraging CRISPR-based gene editing, the team intends to incorporate key genes from the thylacine into dunnart cells, akin to initiatives that aim to bring back the woolly mammoth using the Asian elephant as a proxy. Despite advancements, some experts question the authenticity of such resurrected animals. Mammalogist Ross MacPhee of the American Museum of Natural History noted, “Even if it looks and acts like a thylacine, it may never be truly ‘de-extinct.’”
From Genetic Code to Living Marsupial
Beyond genome sequencing, Colossal has attained key reproductive science accomplishments essential for re-creating the thylacine. A major feat includes inducing ovulation in the fat-tailed dunnart, enabling the retrieval of multiple eggs to serve as hosts for genetically modified cells.
Moreover, scientists have engineered an artificial uterus capable of supporting marsupial embryos through early to mid-development. Andrew Pask highlighted the broader significance of this work: “These advances benefit not only de-extinction but also conservation by enhancing captive breeding for endangered marsupials. They bring us closer to producing a living thylacine once we have the gene-edited cells ready.”
Excitement and Debate Surrounding De-Extinction
The prospect of resurrecting the Tasmanian tiger has ignited both enthusiasm and controversy. Opponents caution that reintroducing a thylacine proxy may disrupt Tasmania's current ecosystems, which have adapted to the predator's absence. Ethical concerns and ecological risks are an ongoing part of the discourse.
Criticism also targets the allocation of financial and scientific resources, arguing that funds might be better spent on protecting existing endangered species. A former de-extinction researcher on Colossal’s advisory board remarked, “The immense investment needed for de-extinction could arguably be put to better use in conserving species still with us today.”
Despite such concerns, Colossal is steadfast in advancing this cutting-edge science. As Lamm said, “Rapid progress in our work brings us ever closer to a future where extinction is reversed.” With continued innovation, bringing the Tasmanian tiger back from extinction might soon move from dream to reality.
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